High strength ASTM A789 S31803 duplex stainless steel tube for oil and gas industry

Parameter Table：

S31803 tube：

ASTM A789 S31803 is a duplex stainless steel material with a two-phase structure of austenite and ferrite. It combines the advantages of both and has excellent corrosion resistance, especially in resisting stress corrosion cracking caused by chlorides. Its yield strength is about twice that of austenitic stainless steel. It is suitable for high pressure and high stress working environments, and has good weldability and processing performance. Typical application areas include marine engineering (such as seawater cooling systems, desalination equipment), oil and gas industry (such as submarine pipelines, chemical injection pipes), chemical industry (such as heat exchangers, reactors), paper and pharmaceutical industries, and environmental protection equipment. This material can work stably in the range of -50°C to 300°C, and is a very cost-effective industrial pipe choice in highly corrosive environments.

Factory advantages and features:

Becoming a highly reliable welded pipe manufacturer is the result of MTSCO's strategic investment in HUXIN Pipe, which has 36 years of professional pipe manufacturing experience. The cooperative enterprise has ensured the delivery of first-class welded pipes with decades of industry experience.

At the same time, MTSCO has built a highly secure supply chain system. Through strategic investment in HUXIN PIPE, which has 35 years of experience in welded pipe manufacturing, MTSCO has reached a deep strategic cooperation with it and become its only international sales center, fully responsible for global sales and promotion. HUXIN has obtained many international certifications such as ISO, PED, AD2000, M650, and is equipped with a complete equipment system including CNC bending machine, shearing machine, 12-meter annealing furnace, pickling tank, ultrasonic eddy current integrated machine. The perfect physical and chemical experimental instruments further strengthen all links from production to quality control, providing full-process guarantee for welded pipe products.

MTSCO's welded pipes are available in a variety of specifications, with a maximum diameter of 3 meters, and the maximum diameter of the pipes that have been hydrostatically tested can reach 1.5 meters. This variety of sizes is suitable for a wide range of industrial scenarios and provides flexible solutions for projects.

The company is equipped with advanced production and testing equipment, including CNC bending machines (maximum thickness 60mm, length 12 meters), to ensure high-precision processing and stronger adaptability. Full-time quality inspectors cover the entire production process, and all welded pipes are 100% photographed and recorded to ensure quality tracking and controllability.

MTSCO always adheres to a rigorous quality management system and has passed ISO, PED, AD2000 and other certifications, demonstrating its high attention to industry standards and providing customers with highly reliable welded pipe products. The exclusive cooperation mechanism improves collaborative efficiency and production capacity, providing customers with more cost-effective welded pipe solutions.

Quality Control Methods:

Strictly control the quality of raw materials

The raw materials come from large steel mills such as Baosteel, Qingshan, TISCO, and Dongfang Special Steel. MTC and PMI reports are required for each batch. PMI inspection is carried out again after arrival at the factory to double confirm the accuracy of the material and ensure the quality of the source.

Automated welding and full-process traceability management

The product is formed by rolling and bending, and adopts PAW + GTAW fully automatic welding process, and the weld is full and stable. The upgraded process solves the problem of out-of-round welds of large-diameter thick-walled pipes, and the 12-meter annealing furnace improves the annealing quality. The entire production process is monitored by the engineering and technical team and quality inspection personnel, and supporting process cards and image archives to ensure that every detail is traceable.

Comprehensive inspection before delivery

All finished products must pass routine inspections such as appearance, PMI, and size before shipment, and undergo comprehensive inspections such as mechanical properties, hardness, water pressure, UT, ET, and 100% X-ray inspection. We also accept quality verification by third-party testing agencies such as SGS, TUV, and BV to ensure customer confidence in use.

Product Packaging：