Stainless Steel Flanges

At Sun Steel Co., Ltd., we offer a wide selection of stainless steel flanges known for their exceptional durability and dependable performance. Built to meet the demands of tough industrial environments, our stainless flanges are manufactured from top-quality materials.

Every flange is crafted with attention to detail and meets strict international standards like ISO, and specifications, including GB/T9112-9124, B16.5, B16.47, B16.48, EN1092, and others. We supply solutions designed for demanding industries like oil and gas, chemical processing, and heavy manufacturing with reliable stainless steel solutions.

Overview of Stainless Steel Pipe Flanges

We offer different types of stainless steel flanges to ensure that engineers can order precisely what they need. The dimensions include OD: DN15-DN2000, WT: Class 150-2500 for forged flanges, and OD: DN150-DN900, WT: Class 150-2500 for complex. Our range of stainless steel flanges includes the following robust, highly durable options:

• Weld Neck Flange: Designed to be welded to a wide range of different sizes and types of seamless pipes and welded pipes, and well-suited for use in high-pressure applications.

• Slip-On Flange: This option can be positioned quickly with minimal effort, allowing engineers and installers greater flexibility. The flange is slipped over the pipe before being welded internally and externally.

• Blind Flange: Designed to seal the ends of pipes or valves, they are commonly used in high-pressure applications and do not come with a bore. The stainless flange type is particularly beneficial when testing pipe pressure.

• Socket Weld Flange: Ideal for small, high-pressure piping systems, these stainless flanges allow pipes to be inserted into the socket end and welded in place to ensure a smooth bore for optimal flow and performance.

• Lap Joint Flange: Commonly used with stub end fittings, lap joint flange is perfect for applications requiring frequent disassembly for maintenance, inspection, or cleaning.

• Threaded Flange: Designed for simple installation without welding, this type of stainless flange can be screwed directly onto pipes, making them suitable for low-pressure and non-critical systems.

• Stainless Steel Flange: Our stainless steel flanges are crafted from high-quality material to provide exceptional corrosion resistance and a longer lifespan compared to other materials.

Duplex Stainless Steel Flange

Duplex stainless flanges offer exceptional performance by combining strength, corrosion resistance, and affordability. Engineered using a dual-phase microstructure, these flanges provide improved stress corrosion cracking resistance and higher yield strength compared to conventional steels.

Their robust design makes them an ideal choice in challenging industrial environments, including oil and gas processing, chemical manufacturing, and power generation facilities. Duplex stainless flanges are engineered for demanding applications where safety, durability, and cost-efficiency are paramount.

Additionally, their compatibility with various sealing systems and ease of installation ensures they remain a preferred option in modern industrial piping systems.

Weld Neck Flange

This type of stainless steel flange is known for its strong mechanical connection and ability to handle high-pressure fluid flows. This makes weld neck flange a common choice for applications in demanding environments such as the oil and gas, chemical processing, and power generation industries.

These stainless flanges are typically butt-welded, meaning the pipe end is inserted into the flange and welded around the circumference to create a robust and leak-proof joint. The even distribution of fluid load across the circular cross-section enhances the system’s overall mechanical strength, which ensures excellent performance of these stainless pipe flanges in high-pressure applications.

Slip-On Flange

This option is valued for its easy installation and versatility. Unlike a weld neck, the slip-on flange is fitted by sliding it over the pipe and welding it in place.

These stainless flanges are often used in low-pressure flow applications, including process lines for oil, gas, and condensates, where the risk of leakage is relatively low. The quality of sealing prevents cross-contamination and helps maintain system purity.

In the industry, stainless steel flanges manufacturers focus on providing slip-on flanges that meet rigorous standards for consistent performance in continuous operation environments.

Blind Flange

Also known as closure or blind plate flanges, these are used to seal the ends of piping systems, especially those designed for continuous high-pressure flows. These stainless steel flanges are bolted in place rather than welded and are typically paired with gaskets for a tight, leak-proof seal.

They are commonly used to isolate valves, pipes, or pressure vessels. The absence of a bore enhances the overall seal’s integrity. As a trusted stainless steel flanges supplier, we ensure top-quality solutions to support long-term system performance.

Stainless Steel Pipe Flanges

Stainless flanges offer excellent corrosion resistance, durability, and the ability to handle high temperatures and pressures. Take a look at different grades and their suitability for various purposes.

Stainless Steel 304

Stainless steel 304 flange, as the name suggests, is crafted from stainless steel 304, an austenitic alloy containing 18% chromium and 8% nickel. This composition provides exceptional resistance to corrosion, oxidation, and chemical exposure.

These stainless steel flanges are non-magnetic and exhibit excellent weldability and formability, which makes them a preferred choice in industries requiring reliable, long-lasting connections. This type of stainless flange is commonly used in oil and gas pipelines, chemical processing, food and beverage production, and water treatment facilities. The grade’s ability to withstand temperatures up to 1600°F (870°C) enhances its performance in environments where high heat and pressure are present.

Stainless Steel 304L

Stainless steel 304L flanges are a low-carbon version of the 304 grade with a maximum carbon content of 0.03%. This makes them less prone to sensitization, which enhances resistance to intergranular corrosion after welding.

These stainless flanges are ideal for applications requiring high weldability, such as chemical processing, oil and gas pipelines, and pharmaceutical equipment. Unlike standard 304 flanges, 304L flanges are better suited for environments where post-weld heat treatment isn’t feasible.

High-productivity stainless steel 304L flanges provide reliable sealing in moderate-pressure applications, reducing downtime while maintaining fluid purity.

Stainless Steel 316

These flanges are manufactured using an austenitic alloy that contains 16% chromium, 10% nickel, and 2% molybdenum. The addition of molybdenum enhances resistance to pitting and crevice corrosion, particularly in chloride-rich environments. These stainless flanges are highly durable and provide superior performance in harsh conditions such as marine and chemical processing applications.

With excellent resistance to high temperatures and chemicals, these high-performance stainless steel flanges are often used in industries like pharmaceuticals, oil and gas, and food processing. They ensure reliable sealing and reduce the risk of leaks and contamination.

Stainless Steel 316L

These flanges are made from stainless steel 316L, a low-carbon version of the 316 grade with a maximum carbon content of 0.03%. This composition enhances resistance to intergranular corrosion after welding. This quality makes them suitable for applications that involve frequent welding without requiring post-weld heat treatment.

Similar to 316, these stainless flanges provide excellent durability and corrosion resistance, particularly in chloride-rich and high-temperature environments. Compared to standard stainless pipe flanges of 316 grade, 316L offers enhanced weldability.

Applications of Stainless Steel Flanges

Sealing, mating with interfaces, and adapting the overall flow throughput are all possible thanks to the reliable and leak-proof connections provided by stainless flanges. Here’s where these benefits can be applied:

• Oil and Gas Industry: Used for high-pressure applications, weld neck, and blind flanges are ideal for pipeline connections and flow systems that must remain fully leak-proof under significant fluid loads.

• Chemical Processing Plants: Essential for connecting pipes that transport corrosive fluids, They offer excellent corrosion resistance and reduce the risk of erosion and failures when handling highly concentrated acid solutions.

• Water Treatment Facilities: High-performance stainless flanges connect pipes in various systems, ensuring that water remains free from contaminants during treatment and filtration, especially for potable water.

• Power Generation: High-temperature steam lines and other critical systems rely on stainless flanges with exceptional mechanical strength and thermal resistance for low-downtime operation and quick maintenance access.

Why Choose Stainless Steel Flanges from Sun Steel?

At Sun Steel, we take pride in being trusted stainless steel flanges suppliers and offering a comprehensive range of stainless flanges for various industries. Our products meet the highest quality standards, fully adhering to ISO 9001, ASTM, and ASME specifications for safety and performance.

In demanding environments and high-performance systems, our focus on precision flanges ensures reliable, leak-proof connections and long-lasting results.

For detailed information, check out the Flanges Technical Specifications PDF file.