ASTM A694 Grade F42 Carbon Steel Flange Forged Weld Neck Flange WNRTJ Flange
ASEME B16.5 ASTM A694 / ASME SA694 F42 Carbon Steel Flange Weld Neck / WNRTJ Flange
The ASTM A694 F42 WNRTJ Flange is a robust, mission-critical component for high-pressure piping networks. Its combination of a strong welding neck, reliable metal-sealing RTJ face, and grade F42 carbon steel makes it the preferred choice for demanding upstream, midstream, and downstream applications where safety, durability, and leak-tight performance are non-negotiable. Manufactured from ASTM A694 Grade F42 steel with a minimum yield strength of 42 ksi (290 MPa), this flange is engineered specifically for high-pressure, high-temperature transmission service in demanding industries. When bolted, the RTJ groove compresses the metal ring gasket to create a durable, leak-tight metal-to-metal seal, making it a critical component in oil & gas wellheads, pipeline manifolds, and petrochemical reactor connections.
Chemical Composition % of ASTM A694 F42 Carbon Steel Flange WNRTJ Flange
| Grade | C | Mn | P | S | Si | Cu | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|---|
| F42 | 0.18-0.26 | 1.00-1.50 | 0.030 | 0.030 | 0.15 | 0.25 | 0.25 | 0.15-0.30 | 0.05-0.10 |
Mechanical Properties of ASTM A694 F42 Carbon Steel Flange WNRTJ Flange
| Grade | Minimum Yield Strength (ksi / MPa) | Minimum Tensile Strength (ksi / MPa) | Elongation (%) | Hardness (HB) | Impact Test (Charpy V-notch, ft-lb / J) |
|---|---|---|---|---|---|
| F42 | 42 / 290 | 60 / 415 | 20 | 187 | =20 / 27 |
High-Pressure Service Capabilities
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Pressure Ratings: Available in Class 600, 900, 1500, and 2500 (ASME B16.5 / ASME B16.47).
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Temperature Range: Suitable for cryogenic to elevated temperatures (typically -46°C to +350°C, depending on material heat treatment).
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Bolt Connection: Designed to withstand high bolt preloads without gasket blowout, making it ideal for HP/HT (High-Pressure/High-Temperature) wells, pipelines, and manifold systems.
Applications
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Oil & Gas Exploration: Wellhead connectors, Christmas trees, choke manifolds.
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Pipelines: High-pressure transmission lines, compressor stations, and metering skids.
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Chemical/Petrochemical: Reactor nozzles, heat exchanger connections, and high-pressure steam lines.
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Hydrogen & Sour Service: With appropriate NACE MR0175/ISO 15156 compliance for H₂S environments.
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