ANSI B16.5 Class 300 Ring Type Joint (RTJ) Alloy Steel 25cr - 20ni Flange

ANSI B16.5 Class 300 RTJ Alloy Steel 25Cr-20Ni Flanges – SSM

SSM offers premium ANSI B16.5 Class 300 Ring Type Joint (RTJ) alloy steel flanges, made from 25Cr-20Ni alloy steel, designed for high-pressure, high-temperature, and critical industrial applications.

Material Composition of 25Cr-20Ni Alloy Steel

The 25Cr-20Ni alloy steel typically consists of:

Chromium (Cr): 24–26% (provides corrosion and oxidation resistance)

Nickel (Ni): 19–21% (improves toughness and high-temperature strength)

Carbon (C): ≤0.08%

Manganese (Mn): 0.5–1.0%

Silicon (Si): ≤1%

Iron (Fe): balance

This composition allows the flange to maintain mechanical strength and corrosion resistance under extreme conditions.

Mechanical Properties

Tensile Strength: 700–850 MPa

Yield Strength: ≥350 MPa

Elongation: ≥25%

Hardness: ≤250 HB

Operating Temperature: Up to 650°C (depending on application)

What is a Class 300 RTJ Flange?

A Ring Type Joint (RTJ) flange is designed for metal-to-metal sealing, ideal for:

High-pressure pipelines

High-temperature applications

Petrochemical, oil & gas, and offshore systems

The raised metal ring in the flange groove ensures leak-proof performance even under extreme pressure.

Advantages

High-pressure and high-temperature resistance – suitable for Class 300 pipelines

Excellent mechanical strength – 25Cr-20Ni alloy ensures toughness and durability

Leak-proof metal-to-metal seal – superior to conventional gasketed flanges

Corrosion resistance – suitable for aggressive industrial environments

Limitations / Considerations

Cost is higher than standard carbon steel or stainless steel flanges

Special machining required for RTJ groove and surface finish

Not suitable for applications outside designed pressure/temperature range

Material and Specifications

Material: 25Cr-20Ni Alloy Steel

Flange Type: Ring Type Joint (RTJ)

Pressure Class: ANSI B16.5 Class 300

Face Type: RTJ Metal-to-Metal Seal

Standards: ANSI B16.5

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

Applications

SSM's 25Cr-20Ni RTJ Class 300 flanges are widely used in:

Oil & gas and offshore pipelines

High-pressure chemical and petrochemical plants

Refinery and high-temperature process systems

Power generation 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 quality assurance

Custom sizes, pressure classes, and finishes available

Fast global delivery and competitive pricing

Conclusion

For ANSI B16.5 Class 300 Ring Type Joint (RTJ) alloy steel 25Cr-20Ni flanges, SSM provides durable, high-strength, and corrosion-resistant flange solutions for high-pressure and high-temperature industrial piping systems.

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

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