Stainless Steel Flanges

Introduction of Stainless Steel Flanges

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.

Pipe flange is a disc-shaped part, which is most common in pipeline engineering. 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 304/304L, 316/316L, 316Ti, 321, 321H, 347H, 317L, 310S, 904L, 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.


What Flange Types We Do

Welding-Neck Flange (WN Flange) Slip-On Flange (SO Flange)
Socket-welding Flange (SW Flange)Blind Flange (BL Flange)
Threaded FlangeOrifice Flange
Lap Joint Flange (Lapped Flange)Long Welding-Neck Flange (LWN Flange)
Swivel Ring FlangeSpectacle Blind Flange (Figure 8 Flange)

What Material We Do

Stainless Steel:

ASTM A/SA182 F304, F304L,F316, F316L, 316Ti, F317L, F321,F321H,  F310H, F347H, N08904, F44 etc. 

(W1.4301, 1.4306, 1.4948, 1.4401, 1.4404, 1.4571, 1.4438, 1.4541, 1.4878, 1.4550, 1.4845, 1.4539, 1.4547 etc.).

Duplex&Super Duplex:

 ASTM A/SA182 F51, F53, F55, F59, F60(w1.4462, 1.4410, 1.4501, 1.4507 etc.)

Nickel Alloy:

ASTM B564 N10276, N06022, N04400,N06600, N06601, N06625, N08800, N08825, N08020 (w2.4819,2.4360,2.4361,2.4602,2.4816,2.4851,2.4856,2.4858,1.4876,1.4958 ) 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.

Flange Dimensions

We supply stainless steel flanges 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.


Our Capacity

Our capacity 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:  150LBS~2500LBS

Dimension:  1/2” to 72” (DN15 ~DN1800)


Quality Control

Every flange will be inspected before shipment, including NDT ( PT, MT or UT test), dimension control, PMI test. The chemical analysis and mechanical properties test are executed each heat number, corrosion test and other inspections are upon client’s requirement.


Flange Packing

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.


How to Order

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.


Flange Process Flow

Flange Process Flow

Market of flange

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.


Product Pictures


Stainless Steel Flange Catalog