As a professional manufacturer of stainless steel pipe fittings, we are committed to providing global customers with high-quality, reliable and diversified flange solutions. Stainless steel flanges are core components in pipeline systems, widely used in petroleum, chemical, water treatment, food processing, pharmaceutical, marine and other industries due to their excellent corrosion resistance, high temperature resistance and mechanical strength. Today, we will introduce the main types of stainless steel flanges we supply, helping you choose the most suitable product for your project needs.
1. Slip-On Flange (SO Flange)
The slip-on flange is one of the most commonly used flange types in industrial applications, favored for its simple structure, easy installation and cost-effectiveness. It features a slightly larger inner diameter than the pipe outer diameter, allowing the pipe to slip through the flange hole, and then be fixed by fillet welding on both the inner and outer sides of the flange.
This type of flange is suitable for low to medium pressure pipeline systems (usually PN1.0-PN4.0, Class 150-Class 300) and is compatible with various stainless steel grades such as 304, 316, 316L. Its advantages include convenient alignment during installation, low welding difficulty, and easy maintenance. It is widely used in water supply and drainage, air conditioning and ventilation, and general chemical pipelines.
2. Weld Neck Flange (WN Flange)
The weld neck flange is a high-performance flange designed for high-pressure, high-temperature and harsh working conditions. It is characterized by a long neck that is seamlessly connected to the pipe through butt welding, which effectively distributes the stress at the welding joint and improves the overall pressure-bearing capacity of the pipeline system.
Compared with other flange types, the weld neck flange has better structural integrity, higher strength and better sealing performance. It is widely used in high-pressure pipeline systems (PN6.3-PN16.0, Class 600-Class 2500), such as oil and gas transmission, petrochemical reaction equipment, and power plant pipelines. Our weld neck flanges are precision machined to ensure the consistency of the neck thickness and pipe wall, ensuring safe and stable operation even under extreme conditions.
3. Socket Weld Flange (SW Flange)
The socket weld flange is specially designed for small-diameter pipelines (usually DN10-DN50) and low to medium pressure applications. It has a socket-shaped inner hole, where the pipe is inserted into the socket, and then fixed by fillet welding at the flange end. This design avoids welding seams inside the pipeline, reducing the risk of medium accumulation and corrosion, and ensuring the smooth flow of the medium.
The socket weld flange is easy to install and has good sealing performance, making it suitable for pipelines transporting clean media such as water, steam, and high-purity chemicals. It is widely used in pharmaceutical, food processing, and electronic industry pipeline systems, where cleanliness and corrosion resistance are strictly required.
4. Threaded Flange (TH Flange)
The threaded flange is a non-welded flange type, which is connected to the pipe through internal threads (or external threads) matching the pipe threads. It does not require welding during installation, which is especially suitable for occasions where welding is not allowed, such as flammable, explosive or high-precision pipeline systems.
This type of flange is easy to disassemble and maintain, and can be reused, which saves maintenance costs for customers. However, it should be noted that the threaded flange is only suitable for low-pressure pipeline systems (usually PN≤1.6, Class 150), as the sealing performance may be affected under high pressure. It is commonly used in gas pipelines, small-diameter water pipelines and temporary pipeline systems.
5. Blind Flange (BL Flange)
The blind flange is a flange with no through hole, mainly used to seal the end of the pipeline, isolate the medium in the pipeline, and facilitate the inspection, maintenance and replacement of pipeline equipment. It is also known as a blank flange, and its structure is simple, usually consisting of a flange plate and bolt holes.
Our blind flanges are available in various specifications to match different flange standards and pipe diameters. They are made of high-quality stainless steel, ensuring good corrosion resistance and pressure-bearing capacity. Blind flanges are widely used in all types of pipeline systems, especially in occasions where the pipeline needs to be temporarily closed or periodically inspected, such as chemical reaction tanks, storage tanks and pump outlets.
6. Lap Joint Flange (LJ Flange)
The lap joint flange, also known as the loose flange, consists of a flange ring and a lap joint stub end. The flange ring can slide freely on the lap joint stub end, which is convenient for alignment during installation and disassembly. This type of flange is suitable for low-pressure, low-temperature pipeline systems and occasions where frequent disassembly is required.
The lap joint flange has the advantages of simple structure, low cost and easy installation, and is compatible with various pipe materials. It is widely used in water treatment, environmental protection, and general industrial pipeline systems. The lap joint stub end is usually butt-welded with the pipe, while the flange ring is connected with bolts, which reduces the welding difficulty and improves the installation efficiency.
Our Advantages in Stainless Steel Flanges
All our stainless steel flanges are manufactured in strict accordance with international standards such as ANSI, DIN, EN, JIS and GB, ensuring that the products meet the quality requirements of global customers. We use high-quality stainless steel raw materials, and through precision machining, strict quality inspection and testing, we guarantee the dimensional accuracy, welding performance and sealing performance of each flange.
In addition, we can provide customized flange solutions according to the specific needs of customers, including special specifications, materials and surface treatments. Our professional technical team and after-sales service team are committed to providing customers with full-process support, from product selection to installation guidance, to solve your worries.
Whether you need slip-on flanges for general industrial pipelines, weld neck flanges for high-pressure systems, or customized flange products, we have the ability to meet your needs. Welcome to contact us for more information about stainless steel flanges and our products and services.
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