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Alloy Steel F11 and F22 Socket Welding Flanges custom

Alloy Steel F11 and F22 Socket Welding Flanges Manufacturers

-- Steady & Reliable Manufacturer --

Durable Alloy Steel Socket Weld Solutions

In high-temperature refinery and power generation circuits, socket welding flanges offer a compact and leak-proof solution for small-diameter piping. Our Alloy Steel F11 and F22 Socket Welding Flanges are manufactured from premium Cr-Mo (Chromium-Molybdenum) steels. F11 (1.25Cr-0.5Mo) and F22 (2.25Cr-1Mo) are the industry standards for resisting hydrogen attack and creep at elevated temperatures. As a professional manufacturer, we ensure precise socket machining to facilitate a strong fillet weld, eliminating the need for internal pipe preparation. These flanges are forged under high pressure to ensure a uniform grain structure, which is critical for preventing thermal fatigue in systems that undergo frequent temperature cycles. Our F11/F22 series provides the structural stability required for high-pressure steam and hydrocarbon service where standard carbon steel would lose its mechanical integrity.

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F11 & F22 Technical Specifications

Technical CategoryDetails
Material GradesASTM A182 F11 (CL2), F22 (CL3)
StandardsASME B16.5, BS 3799
Pressure RatingsClass 150, 300, 600, 1500, 2500
Size Range1/2" to 4" (Standard for SW Type)
Heat TreatmentNormalized and Tempered
FinishBlack Painting, Anti-rust Oil, Zinc Plating

High-Temperature Process Applications

These alloy steel flanges are primarily utilized in oil refineries for high-temperature catalytic reformers and hydrocracking units. They are also common in chemical plants for organic synthesis reactors operating under high thermal stress. In the power sector, F11/F22 socket weld flanges are used for small-bore steam lines, boiler trim, and instrumentation connections. Their resistance to high-temperature oxidation makes them ideal for fossil fuel power stations and industrial furnace piping. Because the socket weld design creates a smooth internal flow, they are also used in high-pressure hydraulic control systems for steam turbines. Whether for new plant construction or maintenance turnarounds, our Cr-Mo flanges ensure reliable performance in "hot" service environments.

Chromium-Molybdenum Advantages

  • Creep Resistance: Molybdenum content enhances the strength of the steel against slow deformation at high temperatures.
  • Hydrogen Resistance: Chromium content provides essential protection against high-temperature hydrogen attack (HTHA).
  • Precision Fit: Socket design allows for easy alignment and strong fillet welds in confined spaces.
  • Thermal Stability: Forged construction ensures the flange maintains its dimensional tolerances during thermal expansion.

Shipping & Export Information

We accept payment via T/T, L/C, and western union. For international shipping, all F11 and F22 flanges are coated with anti-rust oil and protected with plastic caps to maintain the integrity of the socket and sealing face. Small batches are packed in high-strength cartons, while bulk orders are shipped in export-grade plywood cases. Every shipment is accompanied by a 3.1 Mill Test Certificate ensuring compliance with ASTM A182 chemical and mechanical requirements. We offer rapid delivery through major logistics networks, supporting both LCL and FCL shipments. Our team provides full traceability for every heat number, giving you peace of mind for your high-temperature infrastructure projects.

  • Q: When should I choose F22 over F11?
  • A: F22 has a higher chromium and molybdenum content, making it more suitable for higher temperatures and more aggressive hydrogen environments than F11.
  • Q: Do these flanges require pre-heating for welding?
  • A: Yes, alloy steels like F11 and F22 usually require specific pre-heat and post-weld heat treatment (PWHT) temperatures to prevent weld cracking.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Alloy Steel F11 and F22 Socket Welding Flanges Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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