Stainless Steel Forged Flange

 Stainless Steel Forged Flange


Stainless Steel Forged Flange.jpg


Basic Definition

Stainless steel forged flanges are core connecting components used in piping systems to join pipes, valves, and equipment. Made from stainless steel through forging processes, they feature high mechanical strength, excellent corrosion resistance, and reliable sealing performance, outpercasting flanges in high-pressure, high-temperature, and corrosive working conditions.

Manufacturing Process & Materials

Forging Process

Round steel is heated to high temperatures and undergoes plastic deformation through hammering or extrusion, resulting in continuous and dense metal flow lines, refined grains, and no sand holes or air bubbles. Heat treatment (solution treatment, annealing) is often applied to enhance performance, complying with the standard ASTM A182 (forged material standard).

Common Materials

Grade
Characteristics
Typical Applications
304/304L
General corrosion resistance; 304L has lower carbon content and better resistance to intergranular corrosion
Chemical industry, water treatment, general industry
316/316L
Molybdenum-containing, excellent resistance to pitting and crevice corrosion
Marine industry, seawater desalination, pharmaceutical industry
321/347
Stabilized with titanium/niobium, good resistance to high-temperature oxidation and intergranular corrosion
Power plant boilers, high-temperature pipelines

Main Types & Uses

  • Weld Neck (WN) Flange: Features a long neck and bevel for butt welding, with uniform stress distribution. Suitable for Class 300+, high-temperature, high-pressure, and vibrating pipelines.

  • Slip-On (SO) Flange: Slips over the steel pipe and is welded on both sides. Easy to install and cost-effective, suitable for medium and low-pressure applications.

  • Blind Flange (BL): No central hole, used to close the end of pipelines for easy maintenance.

  • Socket Weld (SW) Flange: Suitable for small-diameter (DN≤80) high-pressure pipelines, ensuring easy welding quality.

  • Lap Joint (LJ) Flange: Used with stub ends, can rotate freely, suitable for frequently disassembled systems.

  • Threaded (TH) Flange: No welding required, used for non-weldable or low-pressure gas pipelines.

Standards, Pressure Ratings & Sealing Surfaces

  • International mainstream standards: ASME B16.5 (NPS ½–24, Class 150–2500), EN 1092-1, DIN, JIS, GB/T 9119

  • Sealing surfaces: RF (Raised Face, most commonly used), FF (Flat Face), RTJ (Ring Type Joint, for high pressure), TG (Tongue and Groove Face, leak-proof)

Typical Application Industries

Oil and gas, petrochemical, nuclear power/thermal power, marine engineering, food and pharmaceutical, water treatment, semiconductor high-purity systems, etc.


Timothy Holding Forging Industry

Phone：+86-13758897904
E-Mail：sales@forging-shafts.com

               timothyforging@163.com

Website：http://www.forging-shafts.com

Add：No.68 Wanquan road,Shanquan Village ,Zhouzhuang Town

,Jiangyin City ,Jiangsu Province ,China

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