Top Flanges Supplier in China

As a leading manufacturer based in China, we are dedicated to engineering and producing high-performance forged steel flanges that set the industry standard. Our commitment to quality is absolute, with every flange meticulously crafted to meet stringent international specifications like ASME and EN. This guarantees unmatched reliability and safety for your critical systems. Partner with one of the most dependable flange suppliers and build your projects on a foundation of strength and precision.

INSTANT QUOTE

Decades of Expertise

Certified Quality Assurance

Advanced Forging & Machining

Global Standards Compliance

What is a Flange?

A flange is a forged or cast ring, typically made of steel, that serves as a critical component for connecting pipes, valves, pumps, and other equipment to construct a comprehensive piping system. Unlike permanent welded joints, a flanged connection offers the significant advantage of easy assembly and disassembly. This modularity is essential for systems requiring periodic maintenance, inspection, or modification, saving significant time and labor. The joint is formed when two flanges are bolted together with a gasket compressed between them, creating a robust, leak-proof seal capable of withstanding specified pressure and temperature conditions. Flanges are manufactured in a wide array of materials and designs, each governed by strict international standards to ensure the integrity of the system.

What is a Flange Used For?

Equipment Connection: Provides a secure, serviceable joint for connecting pipes to critical equipment like pumps, valves, and vessels.
System Maintenance: Facilitates easy access to pipelines for routine inspection, cleaning, and repair, minimizing operational downtime.
Pipe-to-Pipe Joining: Creates strong mechanical joints between pipe sections, essential in areas where welding is hazardous or not feasible.
Line Termination & Isolation: Allows for the secure termination or isolation of a pipeline using a blind flange for pressure testing or future expansion.

Why Choose Our Flanges?

Our manufacturing philosophy is centered on quality and precision. We combine controlled forging processes with advanced CNC machining to produce flanges that consistently meet strict industry standards for strength, accuracy, and long-term operational reliability.

Superior Material Strength

Our forging process enhances the metallurgical properties of the steel, resulting in flanges with superior strength and resistance to high pressure and temperature.

Precision Machining

Utilizing advanced CNC equipment, we guarantee precise dimensions and a perfect sealing surface on every flange, ensuring leak-free performance.

Exceptional Durability

From carbon and alloy steel to stainless flanges and nickel alloys, our products are built to withstand corrosion and wear for a long service life.

Customizable Flange Design

We offer tailored solutions based on your specific requirements, including custom dimensions, materials, and compliance with your unique flange design specifications.

What Is The Difference Between Forged And Cast Flanges?

Manufacturing Process: Forging shapes metal using intense compressive force, while casting involves pouring molten metal into a mold.
Internal Structure: Forging creates a tight, refined, and continuous grain structure, resulting in superior mechanical strength and durability.
Performance & Reliability: Forged flanges offer far greater resistance to impact and fatigue, making them the mandatory choice for high-pressure/temperature applications.
Defects & Integrity: The forging process eliminates internal defects like porosity and voids common in castings, ensuring a more reliable and safer product.

How To Choose The Right Flange For Your Application?

Define Operating Conditions: Identify the maximum pressure and temperature your system will operate at to select the correct flange class/rating.
Select The Correct Material: Choose a material (e.g., Carbon Steel, Stainless) compatible with the fluid and environment to prevent corrosion and ensure service life.
Determine Connection Type: Select the flange type (Weld Neck, Slip-On, etc.) based on pipe size, expected stress, and installation requirements.
Verify Standards & Dimensions: Ensure the flange complies with required standards (e.g., ASME B16.5, EN 1092-1) and matches your pipe's specifications.

Explore Our Types of Flanges

Plate flat welding flange

Designed to slide over the pipe, this flange is secured by two fillet welds, one on the exterior and one on the interior. It is a cost-effective and easy-to-align solution, commonly used for low-pressure and non-critical applications.

Socket flange

Featuring a recessed socket for the pipe to rest in, this flange is joined with a single external fillet weld. This design creates a smooth bore and is ideal for smaller diameter pipes in high-pressure systems where leak resistance is crucial.

Neck flat welding flange

Also known as a Weld Neck flange, it features a tapered hub that is butt-welded to the pipe. This transfers stress from the flange to the pipe itself, providing superior strength for high-pressure, high-temperature, or volatile applications.

Butt welding flange

This flange (typically a Weld Neck type) is defined by its connection method. The beveled end is precisely matched to the pipe's bevel, creating a strong, continuous weld that becomes an integral part of the piping system, ensuring maximum structural integrity.

Threaded (Screwed) Flanges

This flange has internal threads that screw directly onto a threaded pipe, eliminating the need for welding. It is typically used for smaller pipe sizes in low-pressure service and in environments where welding is hazardous or impractical.

Blind Flanges

A solid disc with bolt holes, the blind flange is used to seal the end of a piping system or a pressure vessel opening. It provides easy access for future modifications or maintenance and is essential for hydrostatic pressure testing of a system.

Loose sleeve flange

A two-piece assembly consisting of a stub end welded to the pipe and a backing flange that rotates freely. This design simplifies bolt alignment and is perfect for systems that require frequent disassembly for maintenance or inspection.

Integral flange

An integral flange is not welded or attached but is forged or cast as a single unit with the component, such as a valve body or vessel nozzle. This one-piece construction offers the highest strength and reliability for severe service conditions.

NPS (inch)	Flange OD (mm)	Min. Thickness (mm)	Raised Face Dia. (mm)	No. of Bolts	Bolt Circle Dia. (mm)	Bolt Hole Dia. (mm)
1/2"	88.9	11.2	34.9	4	60.3	15.9
1"	108.0	14.3	50.8	4	79.4	15.9
2"	152.4	19.1	92.1	4	120.7	19.1
3"	190.5	23.9	127.0	4	152.4	19.1
4"	228.6	23.9	157.2	8	190.5	19.1
6"	279.4	25.4	215.9	8	241.3	22.2
8"	342.9	28.6	269.9	8	298.5	22.2
10"	406.4	30.2	323.9	12	362.0	25.4
12"	482.6	31.8	381.0	12	431.8	25.4

The data above is for reference purposes. We manufacture a full range of flanges covering all schedules and pressure classes (150, 300, 600, 900, 1500, 2500) and comply with various international standards including EN 1092-1, DIN, BS, and JIS. For complete technical data sheets or custom requirements, please contact our engineering team.

Key Application Industries of Flanges

Oil & Gas / Petrochemical

Used for joining high-pressure pipelines, process vessels, and valves in upstream, midstream, and downstream operations.

Power Generation

Connects high-pressure steam lines, boiler systems, and turbine equipment in fossil fuel, nuclear, and renewable energy plants.

Shipbuilding & Marine

Applied in marine piping for ballast water, engine room cooling, and fuel systems, resisting saltwater corrosion and vibration.

Machinery & Metallurgy

Integral to hydraulic circuits, heavy machinery, and processing equipment in industrial manufacturing and metallurgical plants.

Why Choose Our Flanges?

Direct Manufacturing Expertise: As a manufacturer since 1983, we control the process from raw material forging to CNC machining, ensuring consistent product quality.
Comprehensive Quality Control: Our ISO 9000 certified system ensures full traceability, with in-house testing for mechanical properties and dimensional accuracy.
Broad Material & Standard Compliance: We produce flanges in carbon, alloy, and stainless steel, adhering to major international standards like ASME, EN, and DIN.
Custom Engineering Solutions: Our technical team delivers tailored solutions, manufacturing custom flanges from your specific drawings for unique project needs.
Proven Reliability & Service: With decades of experience, we are committed to delivering dependable products and professional service to support all your project needs.

What Our Client Says

Understand from our clients what they say about doing business with us and the unique value addition we provide.

"We required a series of custom stainless flanges based on our own technical drawings. Their engineering team was highly competent, providing valuable feedback and delivering a final product that matched our specifications with exceptional precision. Their custom capabilities are first-class."

Markus Schmidt

Head of Engineering

"As an international buyer, clear communication is just as important as product quality. Their sales team was incredibly responsive and professional, handling all our technical queries and shipping arrangements efficiently. We are very satisfied with both the product and the service."

Ahmed Al-Jamil

Project Manager

Comprehensive Guide to Flanges

How do I choose a flange?

Choosing the right flange involves a four-step process: First, determine your system’s operating pressure and temperature to select the correct pressure class. Second, select a material compatible with the fluid and environment. Third, match the flange type (e.g., Weld Neck, Slip-On) to your connection needs. Finally, verify compliance with the required dimensional standard (e.g., ASME, EN).

How to identify flange type?

You can typically identify a flange by its key visual features. A Weld Neck has a long, tapered hub. A Slip-On is a flat ring that slides over the pipe. A Socket Weld has a recessed shoulder for the pipe to sit in. A Threaded flange has internal threads, and a Blind flange is a solid disc with no central opening.

How to correctly fit a flange?

Proper fitting is crucial for a leak-proof seal. Ensure both flange faces are clean and aligned. Insert a new, correct-sized gasket. Insert all bolts and hand-tighten the nuts. Then, using a torque wrench, tighten the bolts in a star or criss-cross pattern in multiple stages to apply pressure evenly across the gasket.

What does a flange pressure rating (Class/PN) mean?

The pressure rating indicates the maximum pressure a flange can safely withstand at a given temperature. Class (e.g., 150, 300) is the ASME designation, while PN (Pression Nominale) is the European metric designation. As the operating temperature increases, the flange’s maximum allowable pressure decreases.

What are the common flange face types?

The three most common face types are Raised Face (RF), Flat Face (FF), and Ring-Type Joint (RTJ). Raised Face (RF) is the most versatile, featuring a small raised surface for the gasket. Flat Face (FF) requires a full-face gasket and is used for lower-pressure applications. Ring-Type Joint (RTJ) has a groove for a metal ring gasket, designed for high-pressure and high-temperature services.

Latest Blog Posts

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Partner With a Trusted Flange Manufacturer

With decades of forging experience and a commitment to quality, we are ready to be your reliable partner for all your flange requirements. From standard orders to complex custom designs, our team is here to provide the expertise and products you need to succeed. Contact us today to discuss your project.

Get in Touch Today

Frequently Ask Questions

Q: What materials are available for your flanges?

A: We manufacture flanges in a comprehensive range of materials, including Carbon Steel (e.g., A105), Low-Temperature Carbon Steel (A350 LF2), Alloy Steel (e.g., A182 F11/F22), Stainless Steel (304/304L, 316/316L), Duplex Stainless Steel, and various Nickel Alloys to meet specific service conditions.

Q: What information do I need to provide to get an accurate quote?

A: To provide a fast and accurate quote, please specify the following: Quantity, Flange Type (e.g., Weld Neck, Slip-On), Nominal Pipe Size (NPS), Pressure Class/Rating, Dimensional Standard (e.g., ASME B16.5), required Material Grade, and desired flange face type (e.g., RF, FF).

Q: Can you manufacture flanges based on our drawings?

A: Yes, absolutely. We specialize in custom manufacturing. You can provide us with your technical drawings and specifications, and our engineering team will work with you to produce flanges that precisely meet your unique application requirements.

Q: What quality certifications do your flanges have?

A: Our manufacturing process is certified under the ISO 9000 international quality management system. We can provide Material Test Certificates (MTC) in accordance with EN 10204 3.1 for all our products, ensuring full traceability and compliance with material specifications.

Q: What is your typical lead time for production?

A: Lead times vary depending on the material, quantity, and complexity of the order. Standard items may be available from stock, while custom orders typically range from 4 to 8 weeks. Please contact our sales team with your requirements for a precise delivery schedule.

Q: Do you have a Minimum Order Quantity (MOQ)?

A: We are flexible and handle orders of all sizes, from large-scale project requirements to smaller quantity requests. However, the MOQ can vary for certain non-standard materials or custom designs. We encourage you to contact us to discuss your specific needs.

Q: Are gaskets and bolts included with the flanges?

A: Our standard supply is for the flanges only. Gaskets and bolting are considered separate items as their material and specification depend heavily on the specific service application. They should be specified and sourced separately to ensure a proper and safe joint assembly.

Q: How do you ensure the quality of your forgings?

A: We ensure quality through a controlled forging process that refines the steel’s grain structure, enhancing its strength and durability. Our in-house laboratory performs rigorous testing, including tensile tests, impact tests, and non-destructive examinations (NDE) like ultrasonic testing, to guarantee the integrity of every forging.

Top Flanges Supplier in China

What is a Flange?

What is a Flange Used For?

Why Choose Our Flanges?

Superior Material Strength

Precision Machining

Exceptional Durability

Customizable Flange Design

What Is The Difference Between Forged And Cast Flanges?

How To Choose The Right Flange For Your Application?

Explore Our Types of Flanges

Plate flat welding flange

Socket flange

Neck flat welding flange

Butt welding flange

Threaded (Screwed) Flanges

Blind Flanges

Loose sleeve flange

Integral flange

Flange Size Specifications Chart: ASME B16.5 Class 150

Key Application Industries of Flanges

Oil & Gas / Petrochemical

Power Generation

Shipbuilding & Marine

Machinery & Metallurgy

Why Choose Our Flanges?

What Our Client Says

Comprehensive Guide to Flanges

How do I choose a flange?

How to identify flange type?

How to correctly fit a flange?

What does a flange pressure rating (Class/PN) mean?

What are the common flange face types?

Latest Blog Posts

Partner With a Trusted Flange Manufacturer

Frequently Ask Questions

Q: What materials are available for your flanges?

Q: What information do I need to provide to get an accurate quote?

Q: Can you manufacture flanges based on our drawings?

Q: What quality certifications do your flanges have?

Q: What is your typical lead time for production?

Q: Do you have a Minimum Order Quantity (MOQ)?

Q: Are gaskets and bolts included with the flanges?

Q: How do you ensure the quality of your forgings?

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