ANSI Stainless Steel Forged Pipe Flange

Size Range: 1/8''-24'

Class: 150#, 300#, 400#, 600#, 900#, 1500# & 2500#

Wall Thickness: SCH.10, 20, 30, 40, 80, 120, 160, STD, XS, XXS.

Materials: ASTM A105, ASME A105, ASTM A266 GR.1, GR.2, GR.3, GR.4, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70

Standard: ANSI, JIS, DIN, EN1092-1, UNI, BS4504, SABS1123, AS2129, GOST-12820

Types: Forged / Threaded / Screwed / Plate

Flange Face Type: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove

Description

Pipe flanges are mechanical parts used together with gaskets and bolts to form secure joints in piping systems. They are manufactured in a wide range of sizes and materials, including stainless steel, cast iron, aluminum, brass, and bronze.

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Product Details

Pipe flanges are used to join pipes and other piping components—such as valves, fittings, and special equipment—by means of bolts and gaskets. Depending on the design, flanges can be connected through welding, lapping, or threaded installation.

Using pipe flanges offers several advantages. They provide a strong and reliable joint between pipes and equipment, allow easy access for inspection, maintenance, or system modification, and help reinforce the connection area.

The method of connection depends on the flange type and its intended application. Before installation, factors such as the conveyed medium, operating temperature, pressure rating, flange size, and relevant standards should be carefully evaluated to ensure safe and stable performance of the piping system.

Flange Type	NPS (inch)	ASME Class	Faces	Joint Integrity	Weld	ASME Standards
Welding Neck Flange	All	All	All	High	One butt weld.	B16.5, B31.3
Slip-on Flange	Many	Generally, ≤ 600	FF, RF	Medium	One or two fillet welds.	B16.5, B31.3
Socket Weld Flange	Generally, ≤ ½ to 2. Max ≤ 4	≤ 600	FF, RF	Medium	One fillet weld.	B16.5, B31.3
Lap Joint Ring Flange	Not used for small sizes.	NA	FF	NA	None	B16.5, B31.3
SsStub End of Lap Joint Flange		150 to 2500	FF, RF, RTJ	High	One butt weld.	B16.9, B31.3
Threaded Flange	Generally, ≤ ½ to 2. Max ≤ 4	≤ 300	FF, RF	Low	None	B1.20.1, B31.3
Blind Flange	All	All	All	NA	None	B16.5, B31.3

Specification

Pipe Flanges Raw Material Specifications

Stainless Steel Flange : ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel Flange : ASTM A182 / ASME SA182 F44, F 45, F51, F 53, F 55, F 60, F 61

Carbon Steel Flange : ASTM A105 / ASME SA105 ASTM / ASME A 350 , ASTM A181 LF2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706

Low Temperature Carbon Steel Flange: ASTM A350, LF2, LF3

Alloy Steel Flange : ASTM A182 / ASME SA182 & A387 F1, F5, F9, F11, F12, F22, F91

Copper Alloy Steel Flange : ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200

Nickel Alloy Flange : ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020)