Sun Steel Co., Ltd. delivers a wide range of stainless steel flanges that are known throughout the industry for their uncompromising durability and reliability. Our stainless steel flanges work in full compliance with all international industry standards from bodies like ISO. The range we offer includes many options such as weld neck flanges, each of which is designed to meet your specific requirements.

Overview of Stainless Steel Pipe Flanges

We offer different types of stainless steel flanges to ensure that engineers working on any type of application or project can find exactly what they need. 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. They offer a mechanically robust connection and will distribute load stress evenly across the surface of the flange.
Slip-On Flanges: These easy-to-install flanges can be positioned quickly with minimal effort, affording engineers and installers a greater degree of flexibility. The flange is slipped over the pipe before being welded both internally and externally. This is done to increase the mechanical strength while also preventing fluid leakage.
Blind Flanges: These flanges are used to seal the ends of pipes or valves. They are commonly used in high-pressure applications and do not come with a bore. They are particularly beneficial when testing pipe pressure.
Socket Weld Flanges: These types of flanges are most commonly used in small high-pressure piping systems. Pipes are fitted by inserting them into the socket end before they are welded, ensuring a smooth bore and excellent flow.
Lap Joint Flanges: You will find lap joint flanges used in conjunction with stub end fittings. They are particularly well-suited for applications where frequent dismantling is necessary for inspection and cleaning.
Threaded Flanges: These types of flanges are designed for easy installation, as they do not require welding and can simply be screwed onto pipes. However, they are more suitable in low-pressure and non-critical systems.
Stainless Steel Flanges: We offer a variety of flanges meticulously designed and manufactured from stainless steel. They exhibit exceptional resistance to corrosion that extends their lifetime compared to other alloys and metals.

Weld Neck Flanges

This type of stainless steel flanges are known for their strong mechanical connection and their ability to carry flows of very high pressures. For this reason, weld neck flanges are a common choice for applications in demanding environments such as the oil and gas, chemical processing, and power generation industries where integrity and strength are key.

They are commonly butt-welded which means the end of the pipe is inserted into the flange and then welded around the circumference, creating a robust and leak-proof joint.

Their use in a wide array of high-pressure applications is principally due to the versatile nature of the joint, and the way in which the fluid load is uniformly distributed. This makes optimal use of the inherent mechanical strength of the circular cross section of the piping.

Slip-On Flanges

Stainless steel slip-on flanges have a number of key advantages, most noticeably their ease of installation and versatility. Whereas weld neck flanges are permanently installed, the slip-on style of flange is a tension fit. This allows for the flanges to be removed using a suitable specialist tool with minimal downtime to the overall system.

These flanges are often used for low-pressure flows and you would commonly find them in process lines for oil, gas or condensates where the risk of leakage is relatively low.

Reducing downtime is essential in high throughput environments where continuous operation is needed. The quality of the sealing also prevents cross contamination from occurring that would otherwise compromise the purity of the fluid within the system.

Blind Flanges

Also refered to as closure plate flanges, these are commonly used for sealing the ends of piping systems, especially those that need to withstand continuous high-pressure flows. This type of flange is bolted rather than welded in place and is often paired with a gasket to create a tight seal. They can be used for isolating a valve, pipe or pressure vessel.

The lack of a bore improves the quality of the overall seal, resulting in a robust cap against high-pressure flows. By bolting the flanges engineers can add a degree of future proofing and allow for expansion further down the line.

This allows the system to evolve and introduces a higher degree of flexibility. Planning of this nature is essential for achieving optimal operation of processing plants that need to continually evolve to meet changing user demands.

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 these types of flanges. The corrosion resistance of stainless steel is also a plus for chemical environments.

Oil and Gas Industry

Weld neck and blind flanges are frequently used in the oil and gas industry because they can deliver high-pressure applications. Common applications include pipeline connections and flow systems that need to be fully leak-proof when under significant fluid loads.

Chemical Processing Plants

Stainless flanges are essential for connecting pipes that transport corrosive fluids because their low carbon content reduces erosion. This means that they won’t turn into weak points or points of failure when transporting highly concentrated and potent acid solutions.

Water Treatment Facilities

Water treatment plants use stainless flanges to connect pipes in a wide range of low-pressure and high-pressure systems. The water needs to remain pure and free from contaminants and debris at all stages of the treatment and filtration process, especially if the water is intended for human consumption.

Power Generation

High-temperature steam lines and other critical systems require flanges that have very high mechanical tolerances and exceptional thermal-resistance properties. These types of safety critical systems require low-downtime operation, fast maintenance access, and the ability to quickly and easily adapt to the changing loads placed on the system.

Why Choose Stainless Steel Flanges from Sun Steel?

The Sun Steel team can provide weld neck flanges, custom flanges, and a full range of other types of flanges. We adhere to the highest standards in the industry and are fully compliant with the latest ISO 9001, ASTM, and ASME requirements.

Having the experts in precision flanges by your side really makes the world of difference.