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

Stainless Steel 310 Weld Neck Flanges Chemical Composition

Mechanical Properties of Stainless Steel F310 WNRF Flanges

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.