Square Flanges

Understanding your choice of square flanges options

Selecting the right square flange for your project requires careful consideration of various factors such as application, material, pressure rating, and sealing options. By understanding these factors and their impact, you can make an informed decision that meets your needs.
At Guanxin, we offer a variety of square flanges to meet our customers’ specific needs. Our square flanges are designed to meet the highest safety, efficiency, and durability standards and are made of quality materials. Our team of experts is ready to assist you in selecting the right square flange for your application. We work closely with our customers to understand their unique needs and provide custom square flange solutions that meet their requirements. Our reputation as a reliable supplier of square flanges and other industrial piping components is built on our commitment to quality and customer satisfaction.
Choosing the right square flange for your piping system is critical to ensuring its safety, efficiency, and durability. At Guanxin, we offer a comprehensive selection of square flanges and other industrial piping components tailored to meet our customers’ specific requirements. Our unwavering commitment to quality and customer satisfaction has made us a reliable supplier of industrial piping components. Contact us today to learn how we can help you select the correct square flange for your application.

What are square flanges?

Square flanges are a unique type of flange that features a square shape, as opposed to the more common circular design. Square flanges are used in hydraulic systems to connect a pipe to component or a pipe to pipe connection. It makes in accordance to different standards based on various countries; square flanges come in different pressure rating in order to fulfill their purpose.

Advantages of Square Flanges
a square flange is a unique and versatile type of flange with a square shape, providing advantages such as easy installation, removal, and compatibility with various applications. When selecting a square flange, be sure to consider factors such as material, size, and pressure ratings to ensure a secure and reliable connection in your piping system.
Easy Installation and Removal
The square shape makes them easier to handle and install, particularly in tight spaces. Additionally, the four bolt holes make disassembly quick and straightforward.
Versatility
Square flanges can be used in a wide range of applications, including structural and mechanical systems. Their unique shape makes them suitable for situations where traditional round flanges might not be ideal, such as in compact spaces or when working with non-circular components.
Strength and Durability
Square flanges are designed to withstand high pressure and stress, making them a reliable choice for heavy-duty applications. The materials used to manufacture square flanges, such as stainless steel, carbon steel, and alloy steel, contribute to their strength and durability.

Types of square flanges

The square flange and pipe fixing method are divided into the threaded square flange, welding neck square flange, blind square flange and socket weld square flange.

• Weld Neck Square Flanges: These flanges feature a long, tapered neck welded to the pipe, providing a high-strength connection. Weld neck square flanges are suitable for high-pressure applications and are commonly used in the oil and gas industry.
• Socket Weld Square Flanges: These flanges feature an internal socket that accommodates the pipe, which is then welded to the flange. Socket weld square flanges are perfect for small-sized, high-pressure piping systems.
• Threaded Square Flanges: Designed with internal threads, these flanges enable a secure connection without welding. Threaded square flanges are suitable for low-pressure applications and can be easily assembled or disassembled.
• Square blind flange: It is a square flange without holes in the middle, used to seal the mouth of the pipe. The function played and the head and cap is the same, except that the square blind seal is a removable sealing device, while the seal of the head is not ready to open again. 

According to the form sealing surface can be divided into flat face square flange, raised face square flange, ring type joint square flange:

• Flat Face (FF) Square Flanges: Flat face square flanges have a flat sealing surface, making them suitable for low-pressure applications. They are commonly used in cast iron or plastic piping systems.
• Raised Face (RF) Square Flanges: These flanges have a raised sealing surface, which helps create a tighter seal between the flange and gasket. They are ideal for medium to high-pressure applications and are widely used in various industries.
• Ring Type Joint (RTJ) Square Flanges: RTJ square flanges feature a grooved sealing surface that accommodates a metal ring gasket, ensuring a high-integrity seal. They are suitable for high-pressure and high-temperature applications, such as oil and gas.

How to Measure a square flange?

To measure a square flange accurately, you need to focus on four primary dimensions:

• Flange Face Diameter (A): This is the overall diameter of the flange’s face, which is the surface that mates with another flange or sealing component.
• Bolt Circle Diameter (B): This refers to the diameter of the circle that passes through the center of all the bolt holes.
• Bolt Hole Diameter (C): The diameter of the individual bolt holes in the flange.
• Flange Thickness (D): The thickness of the flange from the back face to the front face.

To measure a square flange, you will need the following tools:

• Caliper: A caliper is an essential tool for measuring the flange face diameter, bolt hole diameter, and flange thickness.
• Tape Measure or Ruler: These measuring tools are useful for determining the bolt circle diameter.
• Protractor or Bolt Hole Gauge: These tools are helpful in ensuring the accurate alignment of bolt holes.

Follow these steps to measure a square flange accurately:

• Measure the Flange Face Diameter (A): Use a caliper to measure the diameter of the flange face. Position the caliper’s jaws across the face of the flange, ensuring that they sit flush against the surface. Record the measurement.
• Measure the Bolt Circle Diameter (B): Place a tape measure or ruler across the center of two opposite bolt holes, making sure it passes through the center of the flange. Measure the distance from the center of one bolt hole to the center of the opposite bolt hole. This is the bolt circle diameter.
• Measure the Bolt Hole Diameter (C): Use a caliper to measure the diameter of an individual bolt hole. Position the caliper’s jaws inside the bolt hole and record the measurement.
• Measure the Flange Thickness (D): Use a caliper to measure the thickness of the flange from the back face to the front face. Position the caliper’s jaws on either side of the flange and record the measurement.
• Verify Bolt Hole Alignment: Utilize a protractor or bolt hole gauge to ensure that the bolt holes are correctly aligned. Place the tool on the flange and align it with the bolt holes. Check the alignment of all bolt holes and note any discrepancies.

Standard for square flanges

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

• ISO 6164 Square Flange
• JIS B2291 Square Flange
• JIS F7806 Square Flange

Materials of square flanges

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

Selecting the Right square flange Material

• Material selection is crucial when choosing square flanges for your piping system. Factors to consider include corrosion resistance, temperature, and pressure requirements. Common materials used for square 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 square flanges

The dimensional tolerances for square flanges should adhere to the following specifications:

• Overall dimensions: ±1.0% of the nominal size;
• Hole diameter: ±0.5 mm;
• Bolt circle diameter: ±1.0 mm;
• Flange thickness: ±0.25 mm.

Dimensions of JIS B2291 Square Flange

Dimensions of JIS F7806 Square Flange

Flange | 280K | JIS F7806 SQUARE FLANGES Unit : mm

Flange | 350K | JIS F7806 SQUARE FLANGES Unit : mm

Dimensions of ISO 6164 Square Flange

Manufacturing process of square flanges

Square 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 square flanges, from the materials used to the final product.

Raw Material Selection and Preparation
Selecting the appropriate raw material is crucial for producing high-quality square flanges. Carbon steel, stainless steel, or alloy steel are typically used, depending on the application requirements. The chosen material must meet the relevant industry standards, such as ASTM, ASME, or DIN. Material selection is based on mechanical properties, corrosion resistance, and service conditions. The raw material is then prepared by removing any surface impurities, such as rust, scale, or oil.
Cutting and Shaping the Raw Material
The prepared raw material is cut into the desired shape and size using various cutting methods, such as shearing, sawing, or plasma cutting. The cut pieces are then shaped using processes like bending or rolling, depending on the required flange dimensions.
Forging Process for Square Flanges
The shaped raw material is heated to a specific temperature, typically between 1100°C and 1300°C, and then forged into square flanges using a hydraulic press or a forging hammer. This forging process improves the flanges’ mechanical properties, such as strength and toughness, and ensures a uniform microstructure.
Heat Treatment of Square Flanges
They undergo heat treatment processes like normalizing, annealing, quenching and tempering to optimize the flanges’ mechanical properties and enhance their durability. These processes involve heating and cooling the flanges at specific temperatures at controlled rates. This step eliminates residual stresses from the forging process, refines the microstructure, and improves overall mechanical properties, such as hardness, ductility, and resistance to wear and corrosion.
Machining the Forged Square Flanges
After heat treatment, the forged square flanges undergo machining operations to achieve precise dimensions, tolerances, and surface finishes. These operations include turning, milling, and drilling, using computer numerical control (CNC) machines for accuracy and efficiency. The flanges’ faces are also machined to ensure flatness, smoothness, and a proper sealing surface.
Surface Treatment and Finishing
The machined square flanges receive surface treatments to enhance their appearance, corrosion resistance, and performance. Common surface treatments include electroplating, passivation, and painting. The choice of treatment depends on the flange material and the application requirements. After the surface treatment, the flanges are cleaned and inspected.

The surface finish of square flanges is critical in ensuring proper sealing and maintaining the integrity of the connection. The following guidelines should be observed:

• The flange face must be free of defects, such as burrs, scratches, and pits.
• The surface finish of the flange contact face should be in accordance with ASME B46.1, with a maximum roughness average (Ra) of 3.2 μm (125 μin) for raised face flanges and 6.3 μm (250 μin) for flat face flanges.

Quality Control and Inspection
Throughout production, the square flanges undergo rigorous quality control and inspection procedures to ensure they meet the required specifications and industry standards. This includes dimensional checks, non-destructive testing (radiographic, ultrasonic, or magnetic particle testing), and destructive testing (such as tensile, impact, or hardness) to verify the flanges’ mechanical properties and integrity. In addition, a visual inspection is performed to assess surface finish, cleanliness, and overall artistry.
Marking
Once the square flanges pass the quality control and inspection processes, they are marked with relevant identification information. This typically includes the manufacturer’s name or logo, material grade, size, pressure rating, and heat or batch number. The marking ensures traceability and compliance with industry standards, facilitating proper installation, maintenance, and record-keeping.
Packaging
They are carefully packaged to protect the square flanges from damage during transportation and storage. Packaging involves cleaning the flanges, applying a protective coating or film to prevent corrosion, and securely packing them in wooden crates, pallets, or cartons. Proper packaging ensures the flanges reach their destination in optimal condition, ready for installation.
Transportation
The packaged square flanges are transported to their destination via suitable transportation methods, such as road, rail, air, or sea freight, depending on the distance and urgency of the delivery. The transportation process must comply with local and international regulations, and proper handling practices must be followed to avoid damage to the flanges during transit. Upon arrival at their destination, the square flanges are ready for installation and use in various industrial applications, such as piping systems, machinery, and equipment.

Square 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 square 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 square 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.

Maintenance and Inspection of Square Flanges

Regular maintenance and inspection of square flanges are essential to ensure their continued performance and safety. This involves checking for signs of wear, corrosion, or damage, as well as verifying the proper torque on fasteners and the condition of gaskets. Periodic non-destructive testing, such as ultrasonic or radiographic inspection, may be performed to assess the flanges’ structural integrity and detect potential issues before they become critical. Maintenance and inspection procedures must follow industry best practices and adhere to the relevant standards and guidelines.

Installation and Maintenance Tips for Square Flanges

Proper installation and maintenance of square flanges are essential to ensure their optimal performance and prevent leakage or failure. Here are some tips to help you with the installation and maintenance of square flanges:
Proper Alignment
Before installing a square flange, ensure that the mating surfaces are clean and properly aligned. Misalignment can cause uneven stress distribution and increase the risk of leaks or failure.
Bolt Tightening
When securing the square flange with bolts, follow a cross-tightening pattern to ensure even distribution of pressure. Tighten bolts incrementally, in stages, to avoid creating excessive stress on one side of the flange.
Gasket Selection
Choose the appropriate gasket material for your application, taking into consideration factors like temperature, pressure, and the media being transported. A properly selected gasket can help prevent leaks and ensure a secure connection.
Regular Inspections
Inspect your square flanges regularly for signs of wear, corrosion, or damage. Early detection of potential issues can help prevent costly failures and downtime.
Lubrication
Lubricate the bolts and nuts during assembly to ensure smooth operation and reduce the risk of seizing or galling. Use a suitable lubricant that is compatible with the materials and the operating conditions of your system.
By following these installation and maintenance tips, you can ensure the longevity and reliability of your square flanges, preventing leaks and failures in your piping system.

Disposal and Recycling of Square Flanges

At the end of their service life, square flanges should be appropriately disposed of and, if possible, recycled. The disposal process must comply with environmental regulations and industry guidelines to prevent ecological harm. Recycling initiatives can help reduce the environmental impact and conserve resources by reusing valuable materials, such as steel or alloy components, to produce new flanges or other industrial products. Proper disposal and recycling practices contribute to a sustainable and eco-friendly manufacturing process.

Application of Square Flanges

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

This square flange is used in various industries:

• Square flanges used in Oil and Gas Pipelines;

• Square flanges used in Chemical Industry;

• Square flanges used in Plumbing;

• Square flanges used in Heating;

• Square flanges used in Water Supply Systems;

• Square flanges used in Power Plants;

• Square flanges used in the Paper & Pulp Industry;

• Square flange uses in General Purpose Applications;

• Square flanges used in Fabrication Industry;

• Square flange uses in Food Processing Industry;

• Square flanges Use in Structural Pipe.

Customizing Square Flanges for Specific Applications

In some situations, you may require a custom square flange to meet the specific requirements of your application. Custom square flanges can be designed and manufactured to suit unique parameters, such as non-standard dimensions, special materials, or additional features.
To obtain a custom square flange, work closely with a reputable manufacturer or supplier. They can help you determine the necessary specifications and design a square flange that meets your needs while ensuring compliance with industry standards and safety regulations.

Factors Affecting the Cost of Square Flanges

The cost of square flanges can vary depending on several factors. Understanding these factors can help you make informed decisions when purchasing square flanges for your project. Some of the factors that can affect the cost of square flanges include:
Material
The material used to manufacture the square flange has a significant impact on its cost. Materials such as stainless steel or alloy steel tend to be more expensive than carbon steel due to their superior properties, such as corrosion resistance and strength.
Size
The size of the square flange also affects its price. Larger flanges require more material and may involve additional manufacturing processes, leading to higher costs.
Pressure Rating
Flanges designed for higher pressure ratings generally require more robust materials and construction, resulting in a higher cost.
Quantity
The number of square flanges you purchase can also influence the price. Buying in bulk may result in volume discounts, reducing the cost per flange.
Manufacturer or Supplier
The choice of manufacturer or supplier can impact the price of square flanges. Reputable suppliers may charge a premium for their products due to higher quality standards, while lesser-known manufacturers may offer lower prices but potentially compromise on quality.
Customization
If you require custom square flanges designed to meet specific requirements, the cost is likely to be higher than for standard, off-the-shelf products. Customization can involve unique dimensions, materials, or additional features, which add complexity to the manufacturing process and increase costs.

How to purchase the correct square flanges?

• 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.

Once you have identified the material and square flange type, the next step is to determine the size and pressure class of the square flange. square 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 square flanges.

How to select square flanges manufacturer?

Choosing the right square 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 Guanxin to Be Your Square Flange Supplier?

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

• High-quality products: Guanxin is committed to providing high-quality square 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: Guanxin offers competitive pricing on its products, which means you can get high-quality square flanges at an affordable price.
• Wide range of products: Guanxin offers a wide range of square 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: Guanxin 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: Guanxin understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently.

Export Country For square flanges

FAQs

1. What is the main difference between a square flange and a round flange?
The main difference is the shape: square flanges have a square shape, while round flanges are circular. This shape difference can make square flanges more suitable for certain applications, such as tight spaces or working with non-circular components.
2. Are square flanges suitable for high-pressure applications?
Yes, square flanges can be suitable for high-pressure applications, depending on their material and pressure rating. Always ensure the flange you choose is compatible with the operating pressure of your system.
3. What materials are commonly used to manufacture square flanges?
Square flanges are commonly made from materials such as stainless steel, carbon steel, and alloy steel. The choice of material depends on factors like compatibility with the media being transported and environmental conditions.
4. Can square flanges be used with pipes of different materials?
Yes, square flanges can be used with pipes made from different materials, as long as the flange material is compatible with the pipe material and the media being transported.
5. How do I determine the appropriate size and pressure rating for a square flange?
To determine the appropriate size and pressure rating, you need to consider the size of the pipe or equipment the flange will be connecting and the operating pressure of the system. The flange should be compatible with both these parameters to ensure a secure and reliable connection.