Finding a reliable stainless steel flange manufacturer in China is not easy.

Many suppliers claim to offer ASTM or ASME-compliant flanges, but actual manufacturing capability, material traceability, machining precision, and delivery consistency can vary significantly.

For EPC contractors, distributors, and industrial buyers, choosing the wrong flange supplier may lead to leakage risks, failed inspections, delayed projects, or expensive replacement costs.

To help buyers source more efficiently, we reviewed leading Chinese stainless steel flange manufacturers based on:

• Industry applications
• Manufacturing capability
• Product range
• Material standards
• Quality certifications
• Export experience
• Custom machining support

This guide covers some of the most recognized stainless steel flange suppliers in China for oil & gas, chemical processing, power generation, shipbuilding, and water treatment projects.

How to Choose a Stainless Steel Flange Manufacturer

Before choosing a flange supplier, industrial buyers should evaluate more than just price.

Here are some key factors to consider when sourcing stainless steel flanges from China:

Material Traceability

Reliable manufacturers should provide full material test certificates (MTC EN 10204 3.1), PMI testing, and heat number traceability.

Compliance with International Standards

Check whether the supplier manufactures according to standards such as:

• ASME B16.5
• ASME B16.47
• EN 1092-1
• DIN standards
• JIS standards

Machining Precision

Poor flange flatness or incorrect drilling dimensions can cause leakage and installation issues.

CNC machining capability is critical for maintaining tight tolerances.

Pressure & Corrosion Resistance

For petrochemical, offshore, or high-pressure applications, buyers should confirm:

• Pressure class
• Corrosion resistance
• Temperature capability
• Welding performance

Export Experience

Manufacturers with international project experience usually understand documentation, packaging, inspection requirements, and shipping procedures better.

Stainless Steel Flanges Manufacturer in China: 10 Leading Options

Here’s an overview of the best Chinese stainless pipe flanges manufacturers today:

These manufacturers are well-equipped to supply stainless steel flanges, boasting extensive experience and certifications, ensuring high-quality products for various industries.

1. Longan Flange

Longan Flange is a leading stainless steel flanges manufacturer located in Wenzhou, China. With over 100 CNC lathes and 16 machining centers, they produce high-quality steel flanges for industries worldwide. Their offerings include weld neck, slip-on, blind, and lap joint flanges, adhering to ASME standards and custom specifications.

Quality is paramount at Longan Flange; each product undergoes rigorous testing, including spectral detection and high-pressure checks, ensuring performance in critical applications. The company prides itself on innovation, employing advanced manufacturing techniques and strong quality control to maintain consistency and timely delivery.

Location: Wenzhou, China

Founded: 2011

2. Jiangsu Sheye Metal

Jiangsu Sheye Metal makes stainless steel flanges for chemical plants and power stations. They build duplex and super duplex flanges that fight off extreme corrosion and handle high pressure.

The company tests every product seriously to ensure quality. Each steel flange must pass at least 5 different tests before shipping to customers. Their machines cut metal with amazing accuracy down to 0.001mm, making them a trusted maker of stainless steel flanges that won’t fail when you need them most.

Jiangsu Sheye Metal offers many product choices for different industries. They make over 1,000 different flange combinations across 8 material grades.

Location: Changzhou, China

Founded: 2014

3. Kaysuns

Kaysuns makes custom and regular flanges for oil refineries, LNG plants, and ships. Started in 2006 in Wenzhou, China. They sell many products beyond just weld neck and threaded flanges – they make lots of steel pipe parts for customers worldwide.

Their weld neck and threaded flanges can take heavy hits and work in super hot places. These tough flanges handle extreme conditions better than most. Kaysuns follows rules like ASME, ASTM, and JIS to make sure everything they make is top quality.

Every stainless steel flange gets heat-treated and checked for problems to make sure it lasts long. Kaysuns always tries new ways to make things better. They want their products to work great and not break down.

Location: Wenzhou, China

Founded: 2006

4. Octal Flange

Octal Flange leads the market in making tough steel flanges for high-pressure jobs. Their stainless steel pipe flanges meet ASTM, ANSI, and JIS standards, so they fit perfectly in many different systems.

The company sells many types of flanges, including weld neck, blind, and socket weld. They make each one with super tight measurements to stop leaks and work better.

Location: Anyang, China

Founded: 2012

5. Jiete Pipe

Jiete Pipe started making pipes in 2017. They work in Wenzhou, China. This company makes lots of stainless steel and carbon steel pipe flanges. They make over 5,000 flanges every month!

They make parts for water cleaning, boats, and big pipes in factories. Their top products include lap joint and slip-on flanges that you can put together fast. These parts help workers save up to 30% on setup time and make pipes work better in tough places.

Jiete’s products fight rust and last a long time – tests show they work for 15+ years in salty water! They make solutions that fit what each customer needs in their industry.

They care about making good stuff. Jiete offers both regular flanges and special ones made just for you. They use 8 modern machines and check everything 3 times before shipping. Their team of 45 workers makes sure every part is perfect.

Customers trust Jiete because they make exactly what they promise. Their careful work means people in over 25 countries buy their products.

Location: Wenzhou, China

Founded: 2017

6. Shanxi Goodwill

Shanxi Goodwill makes top-quality stainless steel and carbon steel pipe flanges for many industries. Started in 2004, they work from Shanxi, China. Over 18 years, they’ve built a good name by making reliable products that meet tough standards and what customers need.

They make many types of flanges like weld neck, slip-on, and blind flanges that work for different jobs. Shanxi Goodwill helps customers by making custom flanges too. Their factory makes over 10,000 flanges each month, giving customers exactly what they need.

Location: Shanxi, China

Founded: 2004

7. Hebei Haihao Group

Hebei Haihao Group specializes in stainless steel and alloy steel flanges, offering a wide range of sizes and specifications. Established as a leading manufacturer, they provide products that cater to industries such as oil, gas, construction, and waterworks. Their extensive product line includes weld neck flanges, blind flanges, lap joint flanges, and slip-on flanges, all designed to meet international standards like ASME and ANSI.

Location: Hebei, China

Founded: 1982

8. Yaang Pipe Industry

Yaang Pipe Industry makes and sells stainless steel flanges, fittings, and pipes for tough industries like petrochemical and waterworks. This company started in 2005 in Wenzhou, China, and people know them for making good stuff and trying new things.

Location: China

Founded: 2008

9. C&N Pipeline

C&N Pipeline sells many types of stainless steel pipe flanges that meet what customers need. They make these products tough and follow global rules. C&N creates new solutions for oil, gas, and water companies.

Their team has 15+ years of experience making flanges. C&N experts check each product 3 times before shipping to make sure you get quality parts

Location: Shanghai

Founded: 2005

10. Xinyue Steel Group

Xinyue Steel Group makes top-quality steel flanges and fittings. They can make over 10,000 tons of stainless steel and carbon steel parts every month. Their stuff works really well and lasts a long time in tough conditions.

Xinyue Steel Group focuses on green manufacturing while delivering expert solutions worldwide. They’ve cut energy use by 25% in the last 5 years while growing their business.

Location: Tianjin

Founded: 2008

Resource： Introduction to Stainless Steel Flanges

Stainless steel flanges are essential components in various piping systems, providing a secure and leak-tight connection between pipes and other equipment. Made from a corrosion-resistant alloy, these flanges are widely used in industries such as petrochemical, process, and waterworks.

The primary advantage of stainless steel flanges lies in their excellent corrosion resistance, which ensures longevity and reliability even in harsh environments. Additionally, their high-temperature strength and durability make them an ideal choice for applications where safety and performance are paramount. Whether it’s for connecting pipes, valves, or other equipment, stainless steel flanges offer a robust solution that meets stringent industry standards.

Types of Stainless Steel Flanges

There are several types of stainless steel flanges available, each designed to meet specific industry requirements and applications. Here are some of the most common types:

• Weld Neck Flanges: These flanges are designed to be welded to the end of a pipe, providing a strong and leak-tight connection. They are ideal for high-pressure applications and are known for their durability.
• Lap Joint Flanges: Used with lap joint stub ends, these flanges offer a flexible and reliable connection. They are particularly useful in systems requiring frequent disassembly for inspection or maintenance.
• Blind Flanges: Designed to seal the end of a pipe, blind flanges provide a secure and leak-tight closure. They are commonly used in piping systems where future expansion is anticipated.
• Socket Weld Flanges: These flanges are used with socket weld pipe fittings, offering a strong and reliable connection. They are suitable for small-diameter, high-pressure piping systems.
• Slip On Flanges: Easy to install, slip on flanges are slipped over the end of a pipe and then welded in place. They are a cost-effective solution for low-pressure applications.

Each type of stainless steel flange serves a unique purpose, ensuring that there is a suitable option for every piping system requirement.

Conclusion

That wraps up our list of top stainless steel flange manufacturers in China.

If you need strict quality control and precision machining, Longan Flange has you covered. We supply stainless steel flanges, ensuring reliable suppliers with competitive pricing and compliance with relevant material specifications.

Contact us today to get the right flanges for your project—built to last and delivered on time.

FAQ

What is the difference between forged flanges and cast flanges?

Forged flanges are manufactured through forging processes, offering higher strength, better grain structure, and improved pressure resistance compared to cast flanges.

Which stainless steel grade is best for flanges?

316 stainless steel is commonly preferred for corrosive environments, while 304 stainless steel is suitable for general industrial applications.

What standards are used for stainless steel flanges?

Common standards include ASME B16.5, ASME B16.47, DIN, EN 1092-1, and JIS standards.

Are Chinese stainless steel flange manufacturers reliable?

Many Chinese flange manufacturers supply products globally and comply with international standards. However, buyers should verify certifications, testing capability, and export experience before placing orders.

What industries use stainless steel flanges?

Stainless steel flanges are widely used in:

• Oil & gas
• Petrochemical
• Water treatment
• Shipbuilding
• Food processing
• Pharmaceutical manufacturing
• Power generation