Weld Neck Flanges

Size: 1/2″ thru 24″ or custom size.
Material: Nickel Alloy，Hastelloy Alloy,Monel Alloy,Inconel Allo, Anti-Corrosion Resistant Alloy, Super-Alloy, Duplex Steel, Stainless steel, Titanium Alloy, Copper Alloy, Carbon Steel, Aluminium Steel, ect.
Standard: A WWA C207, ASME B16.5, DIN, BS, JIS, EN1092-1, ASME B16.47 and GOST/ГОСТ Standard, etc..
Approved by CE, RoHs, SGS, BV
Large stock with different sizes

Weld Neck Flanges Solutions

Weld neck flanges are a reliable and robust solution for demanding industry applications. To ensure the successful implementation and operation of these essential components, it’s crucial to consider factors such as materials, types, installation, maintenance, and additional considerations like standards, certifications, and safety. By understanding and addressing these aspects; you can choose the right weld neck flange solution and ensure its long-lasting performance and integrity in your piping system.

Understanding your choice of weld neck flanges options

Choosing the right welding neck flanges for your application is crucial for the success of your project. By understanding the different weld neck flange options, materials, and factors to consider, you can make an informed decision. At Jihua, we offer a wide range of welding-neck flanges options, materials, and sizes to meet your specific application requirements. Contact us today to learn more about our products and services.

What is a weld neck flange?

A weld neck flange, also known as a high hub flange or tapered hub flange, is a specialized type of pipe flange that is designed to be joined to piping systems by welding the pipe to the neck of the flange. These flanges are characterized by their long, tapered hub, which provides added reinforcement and helps to distribute stress over a larger area, reducing the risk of fatigue and failure.

Advantages of WN flanges

Superior Leak Prevention: Welded neck flanges provide superior sealing, reducing the potential for leaks in high-pressure and high-temperature systems. The tight connection between the flange and pipe helps maintain system integrity and minimizes potential downtime.
High load carrying capacity: Weld neck flanges are designed to withstand extreme loads for demanding applications in the power generation, petrochemical, oil, and gas industries.
Improved stress distribution: The extended neck design of weld neck flanges allows for a gradual transition between flange and pipe, reducing stress concentrations and improving the overall durability of the piping system.
Easy inspection and maintenance: The weld neck flange allows easy access to the piping system for inspection, cleaning, and maintenance, ensuring optimum system performance and minimizing downtime.

Types of Welding Neck Flanges

The following are the primary types of welding neck flanges:

Long weld neck flanges: long weld neck flanges are characterized by an extended neck, which provides added support and reinforcement for high-pressure applications. This type of flange is ideal for use in high-stress environments, such as those involving high temperatures, pressures, or bending forces. Long weld neck flanges are typically used in industries like petrochemical, oil and gas, and power generation.
Reducing weld neck flanges: reducing weld neck flanges, also known as reducer flanges, are designed to connect pipes with different diameters. These flanges feature a tapered neck, which allows for a smooth transition between the two pipe sizes, minimizing turbulence and ensuring optimal flow rates. Reducing weld neck flanges are commonly used in situations where pipe diameter changes are required, such as in process piping systems or water treatment facilities.
Heavy barrel weld neck flanges: heavy barrel weld neck flanges, also known as hbwn flanges, feature a thicker wall thickness and a larger hub diameter compared to standard weld neck flanges. This design provides increased strength and durability, making them suitable for high-pressure and high-temperature applications. Heavy barrel weld neck flanges are often used in the oil and gas, chemical, and power generation industries.
Expander weld neck flanges: expander weld neck flanges are designed to increase the pipe size, facilitating a transition from a smaller to a larger diameter. These flanges have a tapered neck that allows for a smooth flow transition, reducing turbulence and ensuring optimal flow rates. Expander weld neck flanges are commonly used in applications where an increase in pipe size is necessary, such as in pipelines or process systems.
Integral weld neck flanges: integral weld neck flanges, also known as nozzle neck flanges or self-reinforced flanges, are forged as a single piece with the pipe, eliminating the need for a separate weld. This design provides increased strength and leak resistance, making them ideal for high-pressure, high-temperature applications. Integral weld neck flanges are often used in the petrochemical, oil and gas, and power generation industries.

Standard for Welding Neck Flanges

The design and manufacturing of WN flanges are governed by the following standards:

ANSI B16.5 WN Flange
DIN WN Flange
EN 1092-1 WN Flange
BS 4504 WN Flange
UNI WN Flange
SANS 1123 WN Flange
GOST/ГОСТ 33259 WN Flange
ANSI B16.47 WN Flange
JIS B2220 WN Flange
KOREA WN Flange
BS 10 WN Flange
AWWA C207 WN Flange
IWN WN Flange
MSZ WN Flange
Australian WN Flange
French NFE WN Flange
Norwegian NS WN Flange

Materials of Welding Neck Flanges

Depending on the specific application requirements, weld neck flanges are made from a variety of metal materials, including:

Titanium weld neck flange	ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1\| R50400/GR.2 \| R50550/GR.3 \| R50700/GR.4 \| GR.6 \|R52400/GR.7 \| R53400/GR.12 \| R56320/GR.9 \|R56400/GR.5
Copper weld neck flange	T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Copper Nickel weld neck flange	ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Carbon Steel weld neck flange	ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Stainless Steel weld neck flange	ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Alloy Steel weld neck flange	ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Hastelloy weld neck flange	ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Brass weld neck flange	3602 / 2604 / H59 / H62 / etc.
Inconel weld neck flange	ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750
Monel weld neck flange	ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Duplex weld neck flange	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex weld neck flange	S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Alloy 20 weld neck flange	ASTM B462 / ASME SB462, Carpenter 20 Alloy, Alloy 20Cb-3
Aluminium weld neck flange	5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel weld neck flange	ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Nimonic weld neck flange	Nimonic 75, Nimonic 80A, Nimonic 90
Other weld neck flange material	Tin bronze, Alumunum bronze, Lead bronze
Incoloy weld neck flange	ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
254 Smo weld neck flange	ASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547

Selecting the Right Weld Neck Flange Material

Material selection is crucial when choosing weld neck flanges for your piping system. Factors to consider include corrosion resistance, temperature, and pressure requirements. Common materials used for weld neck flanges include:
Carbon Steel: Offers excellent strength and durability, making it suitable for high-pressure applications.
Stainless Steel: Provides outstanding corrosion resistance, making it ideal for use in harsh environments or applications where chemical compatibility is essential.
Alloy Steel: Delivers enhanced resistance to heat and corrosion, making it suitable for high-temperature and high-pressure environments.
Nickel Alloys: Offer superior corrosion and heat resistance, as well as excellent mechanical properties, making them suitable for use in demanding applications such as aerospace, power generation, and petrochemical industries.

Dimensions of Welding Neck Flanges

The size and dimensions of the weld neck flange must be compatible with the piping system’s components. Ensure that the flange’s nominal pipe size (NPS), outer diameter (OD), and bolt circle diameter (BCD) match the corresponding specifications of the connected equipment.

Dimensions of ASME B16.5 Weld Neck Flanges

ASME B16.5 standard weld neck flanges are available in 1/2” to 24” nominal sizes and in pressure of Class 150#, 300#, 600#, 900#, 1500#, and 2500#. There are many seals facing as Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue-and-Groove (T&G), and Male-and-Female (M&F).

Weld Neck Flanges Class 150 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	89	15.7	4	11.2	47.8	30.2	21.3	35.1	0.5
3/4″	99	20.8	4	12.7	52.3	38.1	26.7	42.9	0.9
1″	108	26.7	4	14.2	55.6	49.3	33.5	50.8	1.1
1-1/4″	117	35.1	4	15.7	57.2	58.7	42.2	63.5	1.4
1-1/2″	127	40.9	4	17.5	62	65	48.3	73.2	1.8
2″	152	52.6	4	19.1	63.5	77.7	60.5	91.9	2.8
2-1/2″	178	62.7	4	22.4	69.9	90.4	73.2	104.6	4.3
3″	191	78	4	23.9	69.9	108	88.9	127	5.2
3-1/2″	216	90.2	8	23.9	71.4	122.2	101.6	139.7	5.5
4″	229	102.4	8	23.9	76.2	134.9	114.3	157.2	7.3
5″	254	128.3	8	23.9	88.9	163.6	141.2	185.7	8.9
6″	279	154.2	8	25.4	88.9	192	168.4	215.9	11.3
8″	343	202.7	8	28.4	101.6	246.1	219.2	269.7	18.1
10″	406	254.5	12	30.2	101.6	304.8	273.1	323.9	25.0
12?”	483	304.8	12	31.8	114.3	365.3	323.9	381	39.0
14″	533	336.6	12	35.1	127	400.1	355.6	412.8	51.7
16″	597	387.4	16	36.6	127	457.2	406.4	469.9	64.5
18″	635	438.2	16	39.6	139.7	505	457.2	533.4	75.0
20″	699	489.0	20	42.9	144.5	558.8	508	584.2	89.5
24″	813	590.6	20	47.8	152.4	663.4	609.6	692.2	120
Weld Neck Flanges Class 300 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	95	15.7	4	14.2	52.3	38.1	21.3	35.1	0.8
3/4″	117	20.8	4	15.7	57.2	47.8	26.7	42.9	1.4
1″	124	26.7	4	17.5	62	53.8	33.5	50.8	1.6
1-1/4″	133	35.1	4	19.1	65	63.5	42.2	63.5	2.1
1-1/2″	155	40.9	4	20.6	68.3	69.9	48.3	73.2	3.1
2″	165	52.6	8	22.1	69.9	84.1	60.5	91.9	3.5
2-1/2″	191	62.7	8	25.4	76.2	100.1	73.2	104.6	5.3
3″	210	78	8	28.4	79.2	117.3	88.9	127	7.3
3-1/2″	229	90.2	8	30.2	81	133.4	101.6	139.7	8.2
4″	254	102.4	8	31.8	85.9	146.1	114.3	157.2	11.3
5″	279	128.3	8	35.1	98.6	177.8	141.2	185.7	15.1
6″	318	154.2	12	36.6	98.6	206.2	168.4	215.9	20.0
8″	381	202.7	12	41.1	1	260.4	219.2	269.7	30.5
8″	381	202.7	12	41.1	11.3	260.4	219.2	269.7	30.5
10″	445	254.5	16	47.8	117.3	320.5	273.1	323.9	4.8
12″	521	303.2	16	50.8	130	374.7	323.9	381	64.5
14″	584	333.3	20	53.8	142.7	425.5	355.6	412.8	88.3
16″	648	381	20	57.2	146.1	482.6	406.4	469.9	115.0
18″	711	428.7	24	60.5	158.8	533.4	457.2	533.4	143.0
20″	775	477.8	24	63.5	162.1	587.2	508	584.2	175.0
24″	914	575	24	69.9	168.1	701.5	609.6	692.2	260.0
Weld Neck Flanges Class 600 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	95	15.7	4	14.2	52.3	38.1	21.3	35.1	1.0
3/4″	117	20.8	4	15.7	57.2	47.8	26.7	42.9	1.6
1″	124	26.7	4	17.5	62	53.8	33.5	50.8	2.2
1-1/4″	133	35.1	4	20.6	66.5	63.5	42.2	63.5	2.8
1-1/2″	155	40.9	4	22.4	69.9	69.9	48.3	73.2	3.8
2″	165	52.6	8	25.4	73.2	84.1	60.5	91.9	4.5
2-1/2″	191	62.7	8	28.4	79.2	100.1	73.2	104.6	8.2
3″	210	78	8	31.8	82.6	117.3	88.9	127	8.8
3-1/2″	229	90.2	8	35.1	85.9	133.4	101.6	139.7	12.0
4″	273	102.4	8	38.1	101.6	152.4	114.3	157.2	17.0
5″	330	128.3	8	44.5	114.3	189	141.2	185.7	31.0
6″	356	154.2	12	47.8	117.3	222.3	168.4	215.9	37.0
8″	419	202.7	12	55.6	133.4	273.1	219.2	269.7	55.0
10″	508	254.5	16	63.5	152.4	342.9	273.1	323.9	90.0
12″	559	303.2	20	66.5	155.4	400.1	323.9	381	110.0
14″	603	333.3	20	69.9	165.1	431.8	355.6	412.8	127.0
16″	686	381	20	76.2	177.8	495.3	406.4	469.9	177.1
18″	743	428.4	20	82.6	184.2	546.1	457.2	533.4	215.65
20″	813	477.8	24	88.9	190.5	609.6	508	584.2	267.9
24″	940	575	24	101.6	203.2	717.6	609.6	692.2	372.0
Weld Neck Flanges Class 900 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	121	15.7	4	22.4	60.5	38.1	21.3	34.9	1.9
3/4″	130	20.8	4	25.4	69.9	44.5	26.7	42.9	2.6
1″	149	26.7	4	28.4	73.2	52.3	33.5	50.8	3.8
1-1/4″	159	35.1	4	28.4	73.2	63.5	42.2	63.5	4.3
1-1/2″	178	40.9	4	31.8	82.6	69.9	48.3	73	6.0
2″	216	52.6	8	38.1	101.6	104.6	60.5	92.1	10.8
2-1/2″	244	62.7	8	41.1	104.6	124	73.2	104.8	15.0
3″	241	78	8	38.1	101.6	127	88.9	127	13.7
4″	292	102.4	8	44.5	114.3	158.8	114.3	157.2	22.5
5″	349	128.3	8	50.8	127	190.5	141.2	185.7	37.4
6″	381	154.2	12	55.6	139.7	235	168.4	215.9	47.7
8″	470	202.7	12	63.5	162.1	298.5	219.2	269.9	81.3
10″	546	254.5	16	69.9	184.2	368.3	273.1	323.8	119.0
12″	610	304.8	20	79.2	200.2	419.1	323.9	381	157.0
14″	641	336.6	20	85.9	212.9	450.9	355.6	412.8	180.0
16″	705	387.1	20	88.9	215.9	508	406.4	469.9	217.0
18″	787	438.2	20	101.6	228.6	565.2	457.2	533.4	292.0
20″	857	489	20	108	247.7	622.3	508	584.2	362.0
24″	1041	590.6	20	139.7	292.1	749.3	609.6	692.2	665.0
Weld Neck Flanges Class 1500 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	121	15.7	4	22.4	60.5	38.1	21.3	34.9	1.9
3/4″	130	20.8	4	25.4	69.9	44.5	26.7	42.9	2.6
1″	149	26.7	4	28.4	73.2	52.3	33.5	50.8	3.8
1-1/4″	159	35.1	4	28.4	73.2	63.5	42.2	63.5	4.3
1-1/2″	178	40.9	4	31.3	82.6	69.9	48.3	73	6.0
2″	216	52.6	8	38.1	101.6	104.6	60.5	92.1	10.8
2-1/2″	244	62.7	8	41.1	104.6	124	73.2	104.3	150.0
3″	267	78	8	47.3	117.3	133.4	88.9	127	20.0
4″	311	102.4	8	53.8	124	162.1	114.3	157.2	30.0
5″	375	128.3	8	73.2	155.4	196.9	141.2	185.7	55.5
6″	394	154.2	12	82.6	171.5	228.6	168.4	215.9	68.5
8″	483	202.7	12	91.9	212.9	292.1	219.2	269.9	117.0
10″	584	254.5	12	108	254	368.3	273.1	323.8	194.0
12″	673	304.8	16	124	282.4	450.9	323.9	381	288.0
14″	749	336.6	16	133.4	298.5	495.3	355.6	412.8	380.0
16″	826	387.1	16	146.1	311.2	552.5	406.4	469.9	485.0
18″	914	438.2	16	162.1	327.2	596.9	457.2	533.4	644.0
20″	984	489	16	177.8	355.6	641.4	508	584.2	775.0
24″	1168	590.6	16	203.2	406.4	762	609.6	692.2	1232.0
Weld Neck Flanges Class 2500 LBS Dimensions
NPS	A	B1	Holes	T1	D	X	A	G	Weight
1/2″	121	15.7	4	22.4	60.5	38.1	21.3	34.9	3.1
3/4″	130	20.8	4	25.4	69.9	44.5	26.7	42.9	3.7
1″	149	26.7	4	28.4	73.2	52.3	33.5	50.8	5.3
1-1/4″	159	35.1	4	28.4	73.2	63.5	42.2	63.5	7.8
1-1/2″	178	40.9	4	31.3	82.6	69.9	48.3	73	10.9
2″	216	52.6	8	38.1	101.6	104.6	60.5	92.1	16.2
2-1/2″	244	62.7	8	41.1	104.6	124	73.2	104.3	23.7
3″	267	78	8	47.3	117.3	133.4	88.9	127	36.2
4″	311	102.4	8	53.8	124	162.1	114.3	157.2	55.3
5″	375	128.3	8	73.2	155.4	196.9	141.2	185.7	92.5
6″	394	154.2	12	82.6	171.5	228.6	168.4	215.9	143.0
8″	483	202.7	12	91.9	212.9	292.1	219.2	269.9	215.0
10″	584	254.5	12	108	254	368.3	273.1	323.8	406.0
12″	673	304.8	16	124	282.4	450.9	323.9	381	572.0

Dimensional Tolerance Welding Neck Flange

Certificate	Plate thickness in mm	Width in mm	Length in mm
Outside Diameter	When O is 24″ or less. When O is over 24″.	±0.06″ ±0.12″	±1.6 mm	±3.2 mm
Diameter of Contact Face	0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face.	±0.03″ ±0.02″	±0.8 mm	±0.5mm
Diameter of Hub at Point of Welding	NPS 5 and smaller. NPS 6 and larger.	+0.09″, -0.03″ +0.16″, -0.03″	+2.4 mm, -0.8mm	+4.0 mm, -0.8 mm
Inside Diameter	NPS 10, 12, 18, 20 and larger.	+0.03″ +0.06″ +0.12″, -0.06″	+0.8 mm +1.6 mm	+3.2 mm, -1.6 mm
Diameter of Hub at Base	Hub Base is 24″or less. Hub Base is over 24″.	+0.06″ +0.12″	+1.6 mm	+3.2 mm
Thickness	NPS 18 and smaller. NPS 20 and larger.	+0.12″ +0.19″	+3.2 mm	+4.8 mm
Drilling and Facings	Bolt circle diameter Bolt Hole Spacing	±0.06″ ±0.03″	±1.6 mm	±0.8 mm
Eccentricity of Bolt Circle and Facing	NPS 2 1/2 and smaller. NPS 3 and larger.	±0.03″ ±0.06″	±0.8 mm	±1.6 mm
Length Through Hub	NPS 10 and smaller. NPS 12 and larger.	±0.06″ ±0.12″	±1.6 mm	±3.2 mm

Dimensions of ASME B16.47 Series B Weld Neck Flange/WN Flange

ASME B16.47 Series B Welding Neck Flanges Class 150/300 LBS Dimensions

ASME B16.47 Series B Welding Neck Flanges Class 150 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	786	635	22.4	36	41.1	88.9	684.3	661.9	711.2	63.56
28″	837	685.8	22.4	40	44.5	95.3	735.1	712.7	762	73.5
30″	887	736.6	22.4	44	44.5	100.1	787.4	763.5	812.8	80.05
32″	941	787.4	22.4	48	46	108	839.7	814.3	863.6	91.76
34″	1005	838.2	25.4	40	49.3	110.2	892	865.1	920.8	110.27
36″	1057	889	25.4	44	52.3	117.3	944.6	915.9	971.6	124.91
38″	1124	939.8	28.4	40	53.8	124	997	968.2	1022.4	149.17
40″	1175	990.6	28.4	44	55.6	128.5	1049.3	1019	1079.5	162.58
42″	1226	1041.4	28.4	48	58.7	133.4	1101.9	1069.8	1130.3	179.18
44″	1276	1092.2	31.8	52	60.5	136.7	1152.7	1120.6	1181.1	187.51
46″	1341	1143	31.8	40	62	144.5	1205	1171.4	1234.9	223.84
48″	1392	1193.8	31.8	44	65	149.4	1257.3	1222.2	1289.1	243.46
50″	1443	1244.6	31.8	48	68.3	153.9	1308.1	1273	1339.9	263.22
52″	1494	1295.4	31.8	52	69.9	157.2	1360.4	1323.8	1390.7	279.95
54″	1549	1346.2	31.8	56	71.4	162.1	1412.7	1374.6	1441.5	303.62
56″	1600	1397	31.8	60	73.2	166.6	1465.3	1425.4	1492.3	323.64
58″	1675	1447.8	35.1	48	74.7	174.8	1516.1	1476.2	1543.1	383.77
60″	1726	1498.6	35.1	52	76.2	179.3	1570	1527	1600.2	407.55

ASME B16.47 Series B Welding Neck Flanges Class 300 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	867	635	35.1	32	88.9	144.5	701.5	665.2	736.6	189.56
28″	921	685.8	35.1	36	88.9	149.4	755.7	716	787.4	207.56
30″	991	736.6	38.1	36	93.7	158	812.8	768.4	844.6	254.27
32″	1054	787.4	41.1	32	103.1	168.1	863.6	819.2	901.7	310.53
34″	1108	838.2	41.1	36	103.1	173	917.4	870	952.5	333.98
36″	1172	889	44.5	32	103.1	180.8	965.2	920.8	1009.7	374.99
38″	1222	939.8	44.5	36	111.3	192	1016	971.6	1060.5	51.95
40″	1273	990.6	44.5	40	115.8	198.4	1066.8	1022.4	1114.6	55.97
42″	1334	1041.4	47.8	36	119.1	204.7	1117.6	1074.7	1168.4	508.46
44″	1384	1092.2	47.8	40	127	214.4	1173.2	1125.5	1219.2	69.03
46″	1461	1143	50.8	36	128.5	222.3	1128.9	1176.3	1270	12.74
48″	1511	1193.8	50.8	40	128.5	223.8	1277.9	1227.1	1327.2	678.19
50″	1562	1244.6	50.8	44	138.2	235	1330.5	1277.9	1378	90.66
52″	1613	1295.4	50.8	48	142.7	242.8	1382.8	1328.7	1428.8	98.74
54″	1673	1346.2	50.8	48	136.7	239.8	1435.1	1379.5	1479.6	829.33
56″	1765	1397	60.5	36	153.9	268.2	1493.8	1422.4	1536.7	122.93
58″	1827	1447.8	60.5	40	153.9	274.6	1547.9	1481.1	1593.9	147.04
60″	1878	1498.6	60.5	40	150.9	271.5	1598.7	1531.9	1651	1201.14

ASME B16.47 Series B Welding Neck Flanges Class 400-900 LBS Dimensions

ASME B16.47 Series B Welding Neck Flanges Class 400 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	850.9	635	38.1	28	88.9	149.35	688.85	660.4	711.2	165.95
28″	914.4	685.8	41.15	24	95.25	158.9	739.65	711.2	762	204.49
30″	971.55	736.6	41.15	28	101.6	169.93	793.75	762	819.15	239.2
32″	1035.1	787.4	44.45	28	107.95	179.32	844.55	812.8	873.25	283.06
34″	1085.9	838.2	44.45	32	111.25	187.45	898.65	863	927.1	307.92
36″	1155.7	889	47.75	28	119.13	200.15	952.5	914.4	980.95	381.98

ASME B16.47 Series B Welding Neck Flanges Class 600 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	889	635	44.45	28	111.25	180.85	698.5	660.4	726.95	244.55
28″	952.5	685.8	47.75	28	115.82	190.5	752.35	711.2	784.35	287.49
30″	1022.4	736.6	50.8	28	125.48	204.72	806.45	762	841.25	358.02
32″	1085.9	787.4	53.85	28	130.05	215.9	860.55	812.8	895.35	414.01
34″	1162.1	838.2	60.45	24	141.22	233.43	914.4	863.6	952.5	523.71
1212.9	889	60.45	28	146.05	242.82	968.25	914.4	1009.7	564.36

ASME B16.47 Series B Welding Neck Flanges Class 900 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	1022.4	635	66.55	20	134.87	258.83	742.95	660.4	762	513.64
28″	1104.9	685.8	73.15	20	147.57	276.35	797.05	711.2	819.15	646.22
30″	1181.1	736.6	79.25	20	155.45	289.05	850.9	762	876.3	765.72
32″	1238.3	787.4	79.25	20	160.27	303.28	908.05	812.8	927.1	863.06
34″	1314.5	838.2	85.85	20	171.45	319.02	962.15	863.6	990.6	1023.53
36″	1346.2	889	79.25	24	172.97	325.37	1016	914.4	1028.7	1038.21

Manufacturing process of Welding Neck Flanges

Welding Neck Flanges can be produced by forging, casting. We mainly produce flanges by forging, cutting and rolling processes. We will take you through the step-by-step process of manufacturing weld neck flanges, from the materials used to the final product.

The following type of flange was selected for the qualification. Using the above introduced materials, flanges were manufactured by hummer die forging.

Flange type: 900lbs. 14B WN RF Sch.80 (φ640 x φ318 x H220)

Step 1: Material Selection

The first step in our manufacturing process is material selection. The raw material of the flange is round bar or steel ingot. Billet diameter of F51/F60 was 300 mm and F53 was 350 mm respectively. The billets were cut into blocks of individual weight of 346 kg. We use only the highest quality materials, including carbon steel, stainless steel, and alloy steel. Each material has its own unique properties and is selected based on the specific needs of the customer.

Step 2: Cutting

Once the materials are selected, they are cut to the desired size using a cutting machine. We use state-of-the-art cutting machines to ensure precision and accuracy in every cut.

Step 3: Heating

After the materials are cut, they are heated to the desired temperature. This helps to reduce any stresses in the material and makes it easier to shape the flange.

Step 4: Forging

The flanges were manufactured by closed die forging. The forging was performed by two hummers installed in a domestic forging company according to our order requirements. Table 2 shows the forging conditions and Figure 1 shows the pictures of each forging stage.
The forging operation of F51/F60 needed three heats and F53 needed four heats. After forging, the products were quenched immediately in the water. No defect was found on the surface of the products.
Table.1 Chemical compositions (wt%)

Table.2 Hot working conditions

Figure. Forging process

Step 5: Forming

The next step in our manufacturing process is forming the flange. We use a hydraulic press to shape the heated material into the desired shape. This ensures that each flange is formed with precision and accuracy.

Step 6: Heat treatment

Verification test of the furnace

Before the solution treatment of the flanges, a verification test was carried out in order to confirm the temperature distribution in the furnace. Twenty five (25) dummy flanges were prepared for the test as shown in Figure 2. The measurement result using several thermo couples on the dummy flanges is shown in Figure 3. According to the temperature chart, the maximum temperature difference from target temperature during annealing stage is seven (7) degrees. This means that the furnace is well controlled as a furnace for the solution treatment of stainless steel products.

Figure.2 Dummy flanges for verification

Figure.3 Temperature record chart

Solution treatment of the flanges

Solution treatment was made after forging. Heat cycle is shown in the following: 1,050 ℃ x 2 hours → water quenching.

Surface temperature was monitored at three points of the flange during annealing. All temperature ranges were met within 1,050 ± 7℃ which was satisfactory to standard.

Moreover standard requires that the duration from furnace into quenching bath shall be less than 60sec and the water temperature of the bath shall be below 50℃. According to the measurement results during the quenching, it was confirmed that the transferring time was 53sec and the water temperature was kept under 50℃.

Step 7: Machining

Following the solution treatment, a flange of each material was finished by machining.
There was no difficulty when machining.

After finishing, the penetrant testing (PT) was carried out. No surface defect was found.

Figure.4 and Figure.5 shows the appearance of F51/F60 flange after PT.

Step 8: Investigations of properties

The following investigations were carried out according to standards:

1) Tensile test
2) Impact test
3) Corrosion test
4) Microstructure observation
5) Ferrite content
6) Hardness (only for F53)

Sampling locations except hardness measurement are indicated in Figure 5.

Position 1 is specified at middle of hub and position 2 at middle of flange respectively.

Tensile test
Tensile test results at room temperature are shown in Table 3. At every position, properties are satisfactory to the requirements of standards.
Table.3 Tensile test results

Impact test
Charpy 2mm V-notch tests were carried out at -46 C. Sampling locations were pos. 1 and pos.2 as shown in Figure 5. At each location, the specimens were sampled in axial and tangential directions.
The results are shown in Table 4 with requirements of standards. All results meet the requirements successfully.
However, in the case of F51/F60 material, the results in axial direction at pos.2 are just above the minimum requirements. Therefore further study will be desired in order to increase the impact toughness in this condition.
Table.4 Impact test results

Corrosion test
Corrosion tests were carried out according to ASTM G48 Method A- Ferric Chloride Pitting Test using the specimens sampled at pos.1 and pos.2. Testing conditions were 25 °C x 24 hrs for F51/F60 and 50 °C x 24 hrs for F53 respectively. Table 5 shows the size of specimens and the test results of weight loss. As shown in the table, corrosion resistance of these materials are quite satisfactory.
Table.5 Corrosion test results

Microstructure
Microstructure observation was made at the location of pos.1 and pos.2. As shown in Figure 6, every structure is austenite and ferrite duplex structure. Secondary austenite is observed in both materials however no intermetallic phase is found.

Figure.6 Microstructure

Ferrite content
Table 6 shows the results of ferrite content measurement. AlI of them are between 35 – 55 % which is required by standards. Ferrite content of F53 is less than F51/F60.

Table.5 Ferrite Content

Hardness
Hardness measurement was made only for F53 flange because ASTM A182 requires hardness range to be maximum HB300 for F53 material. All of the results at twenty five (25) points of the radial section were between HB 238 – 260 which meet ASTM requirement. Since specifes no hardness requirement, this measurement is reference only.

Step 9: Qualification

Qualification of the flanges

As reported above, all the properties satisfied the requirements of standards. Based on these investigation data the flanges made of F51/F60 and F53 materials were qualified.

Step 10: Packaging and Delivery

Finally, the flange is packaged and prepared for delivery to the customer. We take great care in packaging our products to ensure that they arrive at their destination in pristine condition.

At Jihua, we take great pride in our manufacturing process of weld neck flanges. We are committed to producing high-quality flanges that meet the needs of our customers. Contact us today to learn more about our products and services.

Marking of Welding Neck Flanges

The marking of weld neck flanges is essential to their manufacture and use. The marking aims to provide information about the flange’s material, size, pressure rating, and other relevant details.

Welding Neck Flanges are typically marked by industry standards, such as ASME B16.5 or EN 1092-1. These standards specify the required information that must be included on the flange, as well as the format and location of the markings.

The required information typically includes the following:

Flange size
Pressure rating
Material specification
Tag number
Manufacturer’s name or trademark
Heat number or lot number
Date of manufacture

The standard also specifies the location of the marking on the flange. Typically, the marking is placed on the raised face of the flange near the bolt holes. In some cases, the marking may be located on the flange hub or the plate itself.

Packing of Welding Neck Flanges

How to package weld neck flanges? To pack the weld neck flange, follow these steps:

When it comes to packaging weld neck flanges, it’s important to ensure that they are properly protected and secured during transportation to prevent any damage. We will walk you through some of the key steps to follow when packaging weld neck flanges.

Step 1: Clean and Inspect the Flanges

Before packaging the weld neck flanges, it’s essential to clean them thoroughly to remove any dust, dirt, or debris that may have accumulated on them. You can use a cloth or brush to clean the flanges and inspect them to ensure they are free from any defects or damages.

Step 2: Choose the Right Packaging Material

The packaging material you choose should be sturdy and able to provide adequate protection to the flanges during transportation. Ideally, you should use a strong cardboard box or wooden crate that can withstand the weight and size of the weld neck flanges.

Step 3: Secure the Flanges

Once you have the packaging material ready, you need to secure the flanges to prevent them from moving around or getting damaged during transit. You can use bubble wrap, foam, or any other suitable cushioning material to protect the weld neck flanges from impact or shock.

Step 4: Label the Package

Labeling the package correctly is crucial to ensure that it reaches the intended destination without any confusion. You should clearly label the package with the recipient’s address, contact information, and any other necessary details.

Step 5: Arrange for Shipping

After the package is fully prepared and labeled, it’s time to arrange for shipping. You can use a reliable courier or shipping company to ensure that the package is delivered on time and in good condition.

Packaging weld neck flanges requires careful planning and attention to detail. By following the above steps, you can ensure that your flanges are properly protected and arrive at their destination safely. Remember to use high-quality packaging materials, secure the weld neck flanges properly, and label the package accurately to avoid any mishaps during transportation.

Inspection and measurement of Welding Neck Flanges

There are several factors that need to be considered when inspecting and measuring weld neck flanges, including:

Material

The first thing to inspect in a weld neck flange is the material. The standard specifies that the flanges should be made from materials such as carbon steel, stainless steel, or alloy steel. The material should be free from any defects such as cracks, porosity, or inclusions that can affect the integrity of the flange.

Dimension

The next thing to inspect in a weld neck flange is its dimension. The standard specifies the dimensions of the flanges based on their nominal size and pressure rating. The flanges should be inspected for their inside and outside diameter, thickness, and overall dimensions to ensure they meet the requirements of the standard.

Surface Finish

The surface finish of a flange is also important. The standard specifies that the flanges should have a smooth and even surface finish to ensure proper sealing of the gasket. Any roughness or irregularities on the surface of the flange can lead to leaks in the piping system.

Bolt Hole Alignment

The bolt holes in a flange should be aligned properly to ensure the bolts can be inserted and tightened correctly. The bolt holes should be inspected to ensure they are in the correct position and are not misaligned.

Bolt Hole Size

The size of the bolt holes is also important. The standard specifies the size of the bolt holes based on the nominal size and pressure rating of the flange. The bolt holes should be inspected to ensure they are the correct size and are not damaged.

Bolt Hole Thread

The threads in the bolt holes are important to ensure the bolts can be screwed in and tightened properly. The threads should be inspected to ensure they are clean and free from any damage or defects.

To inspect and measure weld neck flanges, you will need a set of calipers or a micrometer to accurately measure the dimensions of the flange. It is also a good idea to have a torque wrench on hand to ensure that the bolts are tightened to the correct torque specification.

Weld Neck Flanges Installation Process

Pipe Preparation: Ensure the pipe end is clean, free of debris, and has a smooth, beveled edge to facilitate a proper weld.
Flange Alignment: Align the weld neck flange with the pipe, ensuring that the bolt holes are properly oriented and the flange face is parallel to the pipe end.
Tack Welding: Secure the flange in place with small, temporary welds, known as tack welds. These welds maintain the flange’s alignment with the pipe during the welding process.
Welding: Perform a full-penetration, butt-weld between the pipe and the weld neck flange, ensuring a strong, leak-free connection.
Inspection and Testing: Inspect the weld for any defects or inconsistencies, and conduct pressure testing to verify the integrity of the connection.

Application of Welding Neck Flanges

ASME B16.5 Welding Neck Flanges are known to deliver exceptional performance and are generally developed to meet the demands. We offer a broad range of Welding Neck Flanges through a worldwide network of stock-keeping branches.

This Welding Neck Flange is used in various industries:

Welding Neck Flanges used in Oil and Gas Pipelines;
Welding Neck Flanges used in Chemical Industry;
Welding Neck Flanges used in Plumbing;
Welding Neck Flanges used in Heating;
Weld Neck Flanges used in Water Supply Systems;
Welding Neck Flanges used in Power Plants;
Welding Neck Flanges used in the Paper & Pulp Industry;
Welding Neck Flange uses in General Purpose Applications;
Welding Neck Flanges used in Fabrication Industry;
Welding Neck Flange uses in Food Processing Industry;
Welding Neck Flanges Use in Structural Pipe.

Slip-On Flanges VS Weld Neck Flanges

Welding-neck flanges and weld neck flanges have some similarities and differences, as shown below:

Features	Slip-On Flanges	Weld Neck Flanges
Installation	Easy to install	Difficult to install
Strength	Not as strong as weld neck flanges	Strong and reliable
Pressure	Suitable for low-pressure applications	Suitable for high-pressure applications
Cost	Less expensive	More expensive
Disassembly	Suitable for frequent disassembly	Not suitable for frequent disassembly
Thermal Expansion	Not suitable for systems where thermal expansion or contraction is a concern	Suitable for systems where thermal expansion or contraction is a concern

How to purchase the correct weld neck flanges?

Are you in the market for weld neck flanges but don’t know where to start? Don’t worry, you’re not alone. With so many options available, it can be overwhelming to choose the right flanges for your project. We’ll go over some key factors to consider when purchasing weld neck flanges to ensure that you make the right decision.

Determine the Material Needed

The first step to purchasing the correct weld neck flanges is to determine the material you need. These flanges are available in a variety of materials, including carbon steel, stainless steel, and alloy steel. The choice of material will depend on the specific application and environmental conditions. If you’re unsure which material to choose, consult with a qualified engineer or supplier to help guide you in making the right decision.

Identify the Flange Face Type

Flange face types refer to the surface finish of a flange, and there are many different types of flange face finishes, including flat face (FF), raised face (RF), ring-type joint (SO), tongue and groove (T&G), male and female face (M&F). Each type of flange face has its unique characteristics and is suitable for different applications.

Flat face (FF): This type of flange face has a flat, smooth surface that is perpendicular to the axis of the pipe. It is typically used for low-pressure applications and when the sealing is achieved by a gasket.
Raised face (RF): This type of flange face has a raised ring on the surface that surrounds the bolt holes. The ring provides a surface for the gasket to rest on, which helps to create a better seal. It is commonly used in applications with moderate pressure.
Ring joint face (RTJ): This type of flange face has a specially designed groove to accommodate a metallic ring gasket. The groove is cut into the surface of the flange, and the gasket sits in the groove to create a tight seal. This type of flange face is typically used in high-pressure applications.
Tongue and groove face (T&G): This type of flange face has a raised tongue on one flange and a matching groove on the other flange. The tongue fits into the groove, creating a tight seal without the need for a gasket. This type of flange face is often used in applications where high pressure and temperature are involved.
Male and Female Face (M&F): This type of flange face is similar to the tongue and groove face. However, it has a male and female end which creates a face to face contact between two flanges. This type of flange is mainly used for low pressure and low temperature applications.

To identify a specific flange face type, you need to provide me with more information, such as the flange’s application, dimensions, and material.

Determine the WN flange Size and Pressure Class

Once you have identified the material and weld neck flange type, the next step is to determine the size and pressure class of the weld neck flange. weld neck flanges are available in various sizes and pressure ratings, and it’s crucial to select the correct size and pressure class to ensure that the flange can withstand the intended operating conditions. You should consult the system specifications and design to determine the appropriate size and pressure class.

Surface Finish

The flange face’s surface finish directly impacts the seal’s quality between the flanges. Common surface finishes include smooth, serrated, and grooved. Consult with the gasket manufacturer and consider the specific requirements of your application to select the most appropriate surface finish for your weld neck flanges.

Look for Quality and Certifications

It’s essential to ensure that the weld neck flanges you purchase are of high quality and come with the necessary certifications. Look for suppliers that have a reputation for delivering high-quality products, and check for relevant certifications, such as ISO 9001, API, and CE, to ensure that the flanges meet industry standards.

Consider the Price

While the price should not be the only factor to consider when purchasing weld neck flanges, it’s important to compare prices from different suppliers to ensure that you’re getting a fair price. However, remember that the cheapest option may not always be the best quality, so ensure that you’re not compromising on quality in pursuit of lower costs.

Purchasing the correct weld neck flanges can be challenging, but by considering the factors outlined in this post, you can ensure that you make an informed decision that meets your project requirements. Remember to consult with experts and compare suppliers to ensure that you’re getting a high-quality product at a fair price.

How to select weld neck flanges manufacturer?

Selecting the right manufacturer for weld neck flanges can be a daunting task. With so many options available, it’s easy to get overwhelmed and make the wrong choice. However, choosing the right manufacturer is critical to ensure that you get the best quality flanges that meet your specific needs. We provide some tips to help you select the right weld neck flanges manufacturer.

Quality of Products

The first factor to consider when selecting a weld neck flanges manufacturer is the quality of their products. You should look for a manufacturer that uses high-quality materials and follows strict quality control processes to ensure that their products meet the required standards.

Industry Experience

Another factor to consider is the manufacturer’s industry experience. Look for a manufacturer that has been in the industry for a significant period and has a proven track record of delivering high-quality products to their customers. An experienced manufacturer will have a better understanding of the market and the needs of their customers.

Production Capacity

It is also essential to consider the production capacity of the manufacturer. You should look for a manufacturer that has the capacity to produce the required quantity of flanges in a timely manner to meet your project’s needs.

Pricing

Pricing is another crucial factor to consider when selecting a weld neck flanges manufacturer. While it is essential to look for a manufacturer that offers competitive pricing, it is equally important to consider the quality of their products. Don’t compromise on the quality of the products for the sake of saving a few dollars.

Customer Service

The final factor to consider is the manufacturer’s customer service. Look for a manufacturer that has excellent customer service and is willing to assist you with any queries or concerns you may have. A manufacturer that values their customers will provide a better overall experience.

Choosing the right weld neck flanges manufacturer is essential to ensure you get high-quality products that meet your needs. Look for a manufacturer with quality certifications, experience, a good reputation, customization capabilities, and a competitive price. By following these tips, you will be able to find the right manufacturer for your flange needs.

Why Choose Jihua to Be Your Weld Neck Flange Supplier?

Jihua is a well-established and reputable manufacturer and supplier of weld neck flanges that has been providing high-quality products to customers worldwide for many years. Here are some reasons why you might choose Jihua to be your weld neck flange supplier:

High-quality products: Jihua is committed to providing high-quality weld neck flanges made from the best materials and manufactured to the highest standards. The company has strict quality control procedures in place to ensure that each product meets or exceeds customer expectations.
Competitive pricing: Jihua offers competitive pricing on its products, which means you can get high-quality weld neck flanges at an affordable price.
Wide range of products: Jihua offers a wide range of weld neck flanges, including ANSI, DIN, JIS, EN, and other international standards. This means you can find the right product to meet your specific needs.
Excellent customer service: Jihua is committed to providing excellent customer service and support to all of its customers. The company has a team of experienced professionals who are available to answer any questions or concerns you may have.
Fast delivery: Jihua understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently.

Jihua is a reliable and trustworthy supplier of weld neck flanges that can meet your needs and exceed your expectations.

Export Country For Welding Neck Flanges

MIDDLE EAST	AFRICA	NORTH AMERICA	EUROPE	ASIA	SOUTH AMERICA
Saudi Arabia	Nigeria	Usa	Russia	India	Argentina
Iran	Algeria	Canada	Norway	Singapore	Bolivia
Iraq	Angola	Mexico	Germany	Malaysia	Brazil
Uae	South Africa	Panama	France	Indonesia	Chile
Qatar	Libya	Costa Rica	Italy	Thailand	Venezuela
Bahrain	Egypt	Puerto Rica	Uk	Vietnam	Colombia
Oman	Sudan	Trinidad And Tobago	Spain	South Korea	Ecuador
Kuwait	Equatorial Guinea	Jamaica	Ukraine	Japan	Guyana
Turkey	The Republic Of Congo	Bahamas	Netherland	Sri Lanka	Paraguay
Yemen	Gabon	Denmark	Belgium	Maldives	Uruguay
Syria			Greece	Bangladesh
Jordan			Czech Republic	Mayanmar
Cyprus			Portugal	Taiwan
			Hungary	Cambodia
			Albania
			Austria
			Switzerland
			Slovakia
			Finland
			Ireland
			Croatia
			Slovenia
			Malta