ASTM A350 Lf2 Cl1 150# RF Alloy Steel Flanges

ASTM A350 LF2 CL1 150# RF Alloy Steel Flanges – SSM

SSM offers high-quality ASTM A350 LF2 Class 1 alloy steel flanges, designed for pressure piping systems in industrial applications. Available in 150# RF (Raised Face), these flanges ensure reliable, durable, and leak-proof connections for high-pressure and moderate-temperature pipelines.

Material Composition of ASTM A350 LF2 CL1

ASTM A350 LF2 CL1 is a low-temperature carbon-molybdenum alloy steel with the following typical chemical composition:

C (Carbon): ≤0.23%

Mn (Manganese): 0.30–0.90%

P (Phosphorus): ≤0.035%

S (Sulfur): ≤0.035%

Si (Silicon): 0.10–0.35%

Ni (Nickel): 0.50–1.00%

Mo (Molybdenum): 0.44–0.65%

This composition provides good toughness at low temperatures while maintaining high strength and weldability.

Mechanical Properties

Tensile Strength: 485–620 MPa

Yield Strength: ≥250 MPa

Elongation: ≥20%

Hardness: ≤217 HB

Operating Temperature: Suitable for low-temperature service down to -46°C (-50°F)

What is a 150# RF Alloy Steel Flange?

A Raised Face (RF) flange has a slightly raised surface around the bolt circle, providing:

Enhanced sealing when used with gaskets

Standardized connection for pressure piping systems

Compatibility with welded or bolted piping networks

ASTM A350 LF2 CL1 flanges are ideal for low-temperature, pressure-bearing applications.

Advantages

Excellent low-temperature toughness – prevents brittle fracture

Good mechanical strength – suitable for pressure piping systems

High weldability – can be welded without post-weld heat treatment

Corrosion-resistant in moderate environments

Limitations / Considerations

Not suitable for highly corrosive environments without additional protection

Limited high-temperature performance compared to other alloy steels

Higher cost than standard carbon steel flanges

Material and Specifications

Material: ASTM A350 LF2 CL1 Alloy Steel

Pressure Rating: 150#

Face Type: RF (Raised Face)

Size Range: DN15 – DN600 (½" – 24")

Standards: ASTM A350, ASME B16.5

Applications

SSM's ASTM A350 LF2 CL1 150# RF alloy steel flanges are widely used in:

Low-temperature pipelines in petrochemical and chemical plants

Oil & gas refineries

Power generation plants

Pressure piping systems in moderate-temperature industrial pipelines

Why Choose SSM?

Over 30 years of experience in alloy steel flange manufacturing

Advanced forging and CNC machining for precision and durability

ISO, PED, and TS certified for quality assurance

Custom sizes, pressure ratings, and finishes available

Fast global delivery and competitive pricing

Conclusion

For ASTM A350 LF2 CL1 150# RF alloy steel flanges, SSM provides durable, high-strength, and low-temperature resistant flange solutions suitable for demanding industrial pipelines.

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

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