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A Professional Supplier of

Stainless Steel Flanges

We provides stainless steel flanges of material A182 F304, F304L, F316, F316L, F317L, F321, 310S, 347, 347H, 316Ti, F904L, F44, F51/60, F55 (SDSS 2507) etc.

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Stainless Steel Flange is an indispensable part for a stainless steel piping system, that connects the pipe to another pipe or pipe to a valve. There are holes in the flange, and get the assembly with bolts tightly.

Stainless steel flanges are used in pairs or match with the flanged valves. In pipeline engineering, flanges are mainly used for pipe connection. It has different connected end, such as butt-welding, socket-welding, threaded etc. Different pressure flanges have different thicknesses and use different connection type.

Kaysuns supplies stainless steel flanges for oil and gas, chemical, offshore, marine etc. since 2007. We mainly provide flanges in materials: stainless steel A182 F304/304L, F316/316L, F316Ti, F321, F321H, F347H, F317L, F310S, F904L, 254 SMO (A182 F44), duplex 2205, super duplex 2507 and nickel alloy such as monel 400, Hastelloy C276, Inconel 600, 625, 800H, 825 etc, with standard ASME B16.5, EN 1092-1, JIS B2220, AS 2129 etc. We also accept customized forging upon the design and drawing of client.


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Flange Material

What Material We Do

We are not only do stainless steel, but also titanium alloy, aluminium alloy, chrome-moly alloy etc. ASTM grade is the common material, but the equivalent EN/DIN grade is also available if the quantity is considerable, such as 1.4301, 1.4306, 1.4948, 1.4401, 1.4404, 1.4571, 1.4438, 1.4541, 1.4878, 1.4550, 1.4845, 1.4539, 1.4547, 1.4462, 1.4410, 1.4501, 1.4507, and special alloy 2.4819, 2.4360, 2.4361, 2.4602, 2.4816, 2.4851, 2.4856, 2.4858,1.4876,1.4958 etc.

Stainless Steel

ASTM A182 F304, F304L,F316, F316L, 316Ti, F317L, F321,F321H, F310H, F347H, N08904, F44 etc.

Duplex&Super Duplex

ASTM A/SA182 F51, F53, F55, F59, F60

Nickel-based Alloy

ASTM B564 N10276, N06022, N04400,N06600, N06601, N06625, N08800, N08825, N08020

Titanium Alloys

ASTM SB381 F1, F2, F3, F5, F7, F9, F12 etc.

Aluminium Alloy

ASTM B247 GR 6061, GR.5083 etc.

Other Alloys

ASTM A105,A105N; St37.2, C22.8;
ASTM A182 F11, F12, F22, F5, F91;
ASTM A350 LF2, LF3;
ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 etc.

Our Capacity

Flange Dimensions

Flange Standard

We supply stainless steel flanges with various standards, including but not limited to the followings:
ASME/ANSI B16.5, B16.47A/B, ASME B16.36, MSS SP-44, ISO7005-I, API type 6B/6BX, API605, GB9112~9124, BS1560-3.1,
EN 1092-1 (DIN2527, 2636, 2637, 2638, 2566, 2576, 2632, 3633, 2635, 2642, 2653, 2656, 2655, etc.) JIS B2220, AS2129, AS4078 etc.

The Capacity

It is about 400 tons/month for every type flanges. We produce and supply the flanges from Class 150 to Class 2500, stainless steel and duplex steel flange are our strength. Rate: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500LBS Dimension: 1/2” to 72” (DN15 ~DN1800)



Our factory are ISO 9001 and CE-PED approved manufacturer. We believe that the quality is the life of company. To provide quality product is the things we are doing.

Got a Question?


When you want to get a quote or release a PO to us, pls clear the information:

Flange type + RF/RTJ/FF + Class (including pipe SCH for WN and SW flange) + Size + Material + Standard + Order Quantity

For example, you want to buy 100 pcs welding neck flange with raised face for your system and the pipe is 8” SCH40S, pressure rate is class 300 in stainless steel 316, the piping design is to ASME, so the description would be:

WNRF flange, 8” 300# SCH40S, A182 F316, ASME B16.5, 100PCS

Please don’t hesitate to contact us if you have any question.

All of our flanges are tracable with the heat number and contract number.

The flange will 100% PMI test before shipment to guarantee the material quality. 

We also can issue the test report from third party inspection or independent laboratory and the cost in our account.

Absolutely, Yes.

We are experienced for third party inspection from SGS, BV, Lloyd’s, Intertek, DNV etc.

In fact, we think the inspection before shipment will reduce the disputation, it is a good way for both of us.

Why not? We can do the product based on the design from client or sample, we are experiences with it, whatever the materials is stainless steel or special alloy.

For the flange size < 10”, we mainly packed them in plywood box. For large diameter Flange, they will be packed in pallets if there is no specifics.

We aim the global market, including but not limited to Argentina, Belgium, Brazil, Canada, Chile, Colombia, Costa Rica, Czech Republic, Denmark, Ecuador, Finland, France, Germany, Hungary, Ireland, Italy, Japan, Kazakhstan, Korea Mexico, Netherlands, Pakistan, Panama, Paraguay, Peru , Philippines, Poland, Russia, Spain, Sweden, Switzerland, Ukraine, Ukraine, United Kingdom, United States, Uruguay, Vietnam, etc.


We will reply you in 24 hours. Thank you!