Forged Alloy Steel Flange Welding Neck Slip On ASME B16.5 F11 F22

Alloy steel flange is a critical forged pipe connecting fitting used to connect pipelines, valves and pressure vessels in high-temperature, high-pressure industrial systems. Our factory produces full series forged alloy flanges, including weld neck flange, slip on flange, blind flange, threaded flange and lap joint flange, with RF and RTJ two mainstream sealing faces. Main alloy grades cover 15CrMo, 12Cr1MoV, P11, P22, Cr5Mo, strictly manufactured in accordance with ASME B16.5, HG and GB industrial standards. Compared with carbon steel flanges, alloy flanges possess remarkable high temperature resistance, anti-oxidation and high pressure bearing performance, solving leakage, deformation and medium corrosion problems of piping under extreme working conditions. Suitable for thermal power boilers, petrochemical high-pressure process pipelines, oil & gas long-distance transportation and chemical corrosive medium piping. We provide standard stock alloy flanges and accept customized OEM & ODM service for worldwide engineering projects.

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Flange

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Alloy Steel Flange

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Product Highlights

Product Name: Forged Alloy Steel Pipe Flanges

Core Material: ASTM A182 F11, F22, F5, F9, F91 (Premium High-Temp Grade), ASTM A350 LF2 (Low-Temp).

Flange Types: Welding Neck (WN), Slip-On (SO), Blind (BL), Socket Welding (SW), Threaded (TH), Lap Joint (LJ), Long Welding Neck (LWN).

Pressure Ratings: Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500 (PN16 to PN400).

Flange Facing: Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Male & Female (M&F).

Standard Compliance: ASME B16.5, ASME B16.47 (Series A & B), EN 1092-1, DIN, JIS.

Quality Assurance: 100% 3D CNC machined; 100% PMI verified; MTC EN 10204 3.1 provided.

Premium Forged Alloy Steel Flanges Manufacturer & Supplier

Our Alloy Steel Flanges are engineered to deliver uncompromising sealing integrity under extreme temperature variations and cyclic high-pressure loads. As an experienced forged pipe flanges manufacturer, we utilize state-of-the-art closed-die forging, ring rolling, and precise CNC machining to produce flanges that completely conform to ASME B16.5, ASME B16.47, and EN 1092-1 industrial standards.

Alloy flanges are essential components in petrochemical refineries, high-pressure steam pipelines, power generation plants, and subsea oil & gas systems where carbon steel would fail due to creep or hydrogen embrittlement.

Why Source Our Alloy Steel Flanges?

100% Forged Integrity (No Castings): All our alloy steel flanges are manufactured through professional thermal forging processes. This refines the grain structure of the steel, ensuring maximum impact toughness and grain flow alignment along the flange geometry.

Chrome-Moly Grades Expertise (F11, F22, F91): Our inventory includes specialized ASTM A182 F11 and F22 flanges for steam boiler networks. For critical ultra-supercritical power plant piping, our heavy-section ASTM A182 F91 flanges provide outstanding long-term creep rupture strength at temperatures exceeding 550°C.

Precision CNC Flange Facing: The phonographic serrated finish on our Raised Face (RF) flanges is precisely machined (125-250 AARH) to provide the exact friction required to grip and compress gaskets without causing premature gasket failure.

Industry Solutions

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Petroleum

Chemical industry

Oil & gas transportation

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