B16.5 Forged Alloy Steel A182 F11 RF Pipe Fitting Weld Neck Flange.jpg

B16.5 Forged Alloy Steel A182 F11 RF Weld Neck Flange – SSM

SSM provides premium forged alloy steel A182 F11 weld neck flanges, manufactured according to ASME B16.5 standards. These RF (Raised Face) flanges are designed for high-temperature and high-pressure piping systems, offering durability, reliability, and excellent mechanical performance.

Material Composition of A182 F11 Alloy Steel

A182 F11 is a chromium-molybdenum alloy steel with the following typical composition:

Carbon (C): 0.05–0.15%

Manganese (Mn): 0.30–0.60%

Phosphorus (P): ≤0.035%

Sulfur (S): ≤0.035%

Silicon (Si): 0.50–0.80%

Chromium (Cr): 0.90–1.20%

Molybdenum (Mo): 0.44–0.65%

Iron (Fe): balance

This alloy ensures high-temperature strength, corrosion resistance, and excellent toughness, suitable for steam, oil, and gas pipelines.

Mechanical Properties

Tensile Strength: 485–620 MPa

Yield Strength: ≥205 MPa

Elongation: ≥20%

Hardness: ≤217 HB

Operating Temperature: Up to 565°C (1049°F)

What is a Weld Neck RF Flange?

A weld neck flange (WN) has a tapered hub that is welded to the pipe, providing:

Even stress distribution along the flange and pipe connection

Leak-proof sealing using raised face (RF) gaskets

High mechanical strength for pressure and high-temperature applications

A182 F11 flanges are commonly used in power plants, petrochemical plants, and high-temperature industrial piping systems.

Advantages

Excellent high-temperature strength – ideal for steam and hot oil systems

Good corrosion and oxidation resistance – suitable for moderate corrosive environments

High toughness – reduces risk of brittle fracture

Reliable sealing with RF gaskets – prevents leakage under pressure

Limitations / Considerations

Higher cost than carbon steel flanges

Requires proper welding and heat treatment to achieve optimal performance

Not suitable for extremely corrosive environments without protective coating

Material and Specifications

Material: A182 F11 Alloy Steel

Flange Type: Weld Neck (WN), Raised Face (RF)

Standards: ASME B16.5

Pressure Classes: 150–2500#

Size Range: NPS ½" – 24" (DN15 – DN600)

Applications: High-temperature and high-pressure pipelines in petrochemical, power, and industrial plants

Applications

SSM's A182 F11 RF weld neck flanges are widely used in:

Steam, hot oil, and gas pipelines

Petrochemical and chemical plants

Power generation piping systems

High-temperature industrial pipelines

Why Choose SSM?

Over 30 years of experience in alloy steel flange manufacturing

Advanced forging, CNC machining, and quality inspection

ISO, PED, and TS certified for high-temperature and high-pressure applications

Custom sizes, pressure classes, and finishes available

Fast global delivery and competitive pricing

Conclusion

For B16.5 forged alloy steel A182 F11 RF weld neck flanges, SSM provides durable, high-strength, and high-temperature-resistant flange solutions for critical industrial pipelines.

📩 Contact SSM today for quotations, technical drawings, or custom flange solutions.

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