Introduction

A stainless steel pipe flange is an industrial stainless steel flange used to connect pipes, valves, pumps, and other equipment in piping systems. As a forged stainless steel flange manufactured by a professional stainless steel flange manufacturer, it provides reliable sealing and mechanical strength while offering corrosion resistant stainless steel flange performance across diverse operating environments. Produced according to international standards including ASTM A182 stainless steel flange, ASME B16.5 stainless steel flange, ANSI stainless steel flange, DIN stainless steel flange, EN 1092-1 stainless steel flange, and JIS stainless steel flange, common material grades include 304 stainless steel flange, 316 stainless steel flange, 316L stainless steel flange, duplex stainless steel flange, and super duplex stainless steel flange. These flanges are designed for bolted connections, allowing easy assembly, disassembly, and maintenance.

Stainless Steel Flange Available Products and Standard

1. ASTM A182 / ASME SA182 

(Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service)

Type: 

• Forged Stainless Steel Flange

• Industrial Stainless Steel Flange

• Corrosion Resistant Stainless Steel Flange

Size Range:

• Nominal pipe size (NPS): 1/2″ – 48″ (DN15 – DN1200)

• Pressure classes: 150, 300, 600, 900, 1500, 2500 (ASME B16.5)

• Flange types: Welding Neck (WN), Slip-On (SO), Blind (BL), Threaded (TH), Socket Weld (SW), Lap Joint (LJ)

Surface: Forged, Machined, Heat treated (solution annealed + quenched), Pickled, Passivated, Oil coated

Testing: Chemical analysis (per material grade), tensile test, hardness test (for duplex: >70% ferrite), flattening test, hydrostatic test, PMI (positive material identification), NDE (UT, MT, PT per ASME), dimensional inspection

2. ASME B16.5 / ASME B16.47 (Standard for Pipe Flanges and Flanged Fittings – NPS 1/2 through 24 / 26 through 60)

Type: 

• ANSI Stainless Steel Flange

• ASME B16.5 Stainless Steel Flange

Size Range:

• ASME B16.5: NPS 1/2″ – 24″ (DN15 – DN600)

• ASME B16.47: NPS 26″ – 60″ (DN650 – DN1500)

Surface: Machined (smooth or serrated finish for gasket seating), coated with anti-rust oil

Testing: Dimensional inspection (bolt circle, flange thickness, hub diameter, face roughness), hydrostatic test (per design pressure), RTJ groove inspection (for ring joint flanges), marking verification (material, class, heat code, standard)

Applications

(1)Oil and gas – Stainless steel flange for oil and gas upstream, midstream, and downstream systems (offshore platforms, refineries, pipeline manifolds) provides high pressure ratings and corrosion resistance in sour service (H₂S/CO₂) with duplex and super duplex grades.

(2)Pipeline – Stainless steel flange for pipeline transmission (long‑distance oil, gas, water, and chemical pipelines) ensures leak‑tight joints, accommodates thermal expansion, and enables quick maintenance access.

(3)Chemical industry – Stainless steel flange for chemical industry (reactor connections, storage tank nozzles, mixing vessels) resists aggressive acids, alkalis, and solvents, with 316L or duplex grades offering enhanced pitting and crevice resistance.

(4)Water treatment – Stainless steel flange for water treatment (reverse osmosis skids, ultrafiltration systems, desalination plants) provides long‑term corrosion resistance to chlorinated water and brine, especially with 304L, 316L, or super duplex materials.

(5)Marine – Stainless steel flange for marine applications (shipboard piping, seawater cooling lines, ballast systems, port facilities) withstands saltwater exposure and atmospheric corrosion, with duplex and super duplex grades offering superior chloride stress corrosion cracking resistance.

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