ASTM A182 F310 Weld Neck RTJ Flange
ASTM A182 F310 Weld Neck RTJ Flange is a high-pressure sealing flange forged from high-chromium-nickel austenitic stainless steel UNS S31000. It complies with ASTM A182 high-temperature forgings standard and ASME B16.5 dimensional specification.
Its annular groove seal (RTJ) design is specially designed for extreme working conditions. It can withstand temperatures up to 1150°C and has resistance to high-temperature oxidation, sulfur corrosion and creep. It is widely used in oil and gas wellhead equipment, refinery cracking equipment, high-temperature furnace pipe systems and high-pressure chemical pipelines.
It meets stringent standards such as API 6A and NACE MR0175, and is suitable for Class 150 to Class 2500 pressure levels, ensuring reliable sealing and long-term safe operation under high-pressure environments.
Equivalent Grades for Stainless Steel F310 Weld Neck Flanges
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 310 | 1.4841 | S31000 | SUS 310 | 310S24 | 20Ch25N20S2 | - | X15CrNi25-20 |
Stainless Steel 310 Weld Neck Flanges Chemical Composition
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| SS 310 | 0.015 max | 2.0 max | 0.020 max | 0.015 max | 0.15 max | 19.00 - 21.00 | 24.00 - 26.00 | 0.10 max | 54.7 min |
Mechanical Properties of Stainless Steel F310 WNRF Flanges
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.9 g/cm3 | 1402 °C (2555 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 40 % |
Application
Oil and gas extraction: high-pressure wellhead equipment, submarine pipelines and natural gas processing equipment (in compliance with API 6A/17D standards), resistant to H₂S/CO₂ acidic media;
Oil refining and petrochemicals: cracking furnaces, catalytic cracking units and high-temperature sulfur corrosion pipelines (temperatures up to 1150°C), resistant to high-temperature oxidation and sulfidation corrosion;
Energy and power: ultra-supercritical power plant steam pipelines, nuclear reactor cooling systems and heat treatment furnace accessories;
Chemical and metallurgy: strong acid (sulfuric acid, nitric acid) reactors, high-temperature molten salt transmission pipelines and sulfur-resistant flue gas systems.
Its annular groove seal (RTJ) structure and UNS S31000 material work together to ensure reliable sealing of Class 150~2500 pressure levels, meet ASME B16.5, NACE MR0175 and other standards, and are suitable for harsh working conditions that require long-term creep resistance and thermal fatigue resistance.
