4 inch ASTM A790 S31803 welded pipe in petrochemical industry

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S31803 welded pipe

S31803 welded pipe is a duplex stainless steel material with both austenite and ferrite structures, and has excellent corrosion resistance, especially in terms of resistance to chloride stress corrosion cracking, pitting and crevice corrosion. At the same time, this material has high strength and good welding performance, and is suitable for application environments that require both mechanical properties and corrosion resistance. S31803 welded pipe is widely used in marine engineering, chemical equipment, oil and gas transportation, heat exchangers, papermaking and desalination industries, and is an ideal choice for dealing with corrosive and high-intensity working environments.

Factory advantages and features

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

 MTSCO's welded pipes are available in a variety of specifications, with diameters up to 3 meters and hydrostatically tested pipes up to 1.5 meters. This diversity of sizes caters to a wide range of industrial applications, providing flexibility to meet specific project requirements.

 MTSCO is equipped with state-of-the-art production and inspection equipment such as CNC bending machines, shearing machines, 12-meter annealing furnaces, pickling tanks, ultrasonic eddy current integrated machines and physical and chemical laboratories, ensuring a comprehensive production process. The bending machine has a maximum thickness of 60MM and a length of 12 meters, which improves accuracy and versatility.

To ensure the quality of welded pipes, MTSCO follows a meticulous quality control process. Full-time quality inspectors supervise the entire production process before, during and after production, and guarantee 100% shooting of all welded pipes.

 MTSCO's dedication to quality is reflected in its various certifications, including ISO/PED/AD2000. These certifications underscore adherence to stringent industry standards, giving customers confidence in the quality and reliability of MTSCO's welded pipes.

Quality Control Methods

First, secondary inspection of raw materials

Our raw materials come from large factories such as Baosteel, Tisco,TSINGSHAN, Eastern Special Steel... Each batch of raw materials requires MTC and PMI. After the raw materials arrive, we conduct PMI and other inspections again to ensure that they meet the requirements

Second, traceability of the production process

MTSCO welded pipe is mainly formed by rolled plate (RBE) and bending, and the welding adopts PAW+GTAW. The whole process is automatic welding, which makes the welding efficiency increase and the weld seam more full and stable. Huxin's welded pipes have been upgraded in traditional technology, solving the problem of non circular welds in large size welded pipes, and use the 12-meter annealing furnace to make the annealing of the pipe more complete.

Each process is supervised by experienced engineers and technicians. Each link is supervised by professional qc inspectors and photographed for archiving. The entire process uses process cards to ensure accuracy and traceability.

Third, 100% inspection before shipment

MTSCO has professional QC team to conduct a series of inspections and experiments on the pipes, including routine appearance, PMI, size, quantity, and other inspections. At the same time, we also conducts mechanical testing, hardness testing, X-ray test, UT, ET, HT and other tests. Hydrotesting can test pipes with a maximum OD of 630mm, and we also perform 100% X-ray testing of welds.

In addition, we also accept third-party inspection, such as SGS, TUV, and BV.

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