ASTM A790 Duplex Stainless Steel Seamless and Welded Pipe

--High Strength, Corrosion Resistance, and Versatile Applications in Industrial Piping

 

ASTM A790 duplex stainless steel pipes provide exceptional strength and corrosion resistance, making them ideal for high-pressure, high-temperature applications. Both seamless and welded options meet stringent industry standards, ensuring durability and reliability in critical pipeline systems.

 

ASTM A790 is an internationally recognized stainless steel standard specifically designed for the production of duplex stainless steel seamless and welded pipes, covering material composition, mechanical properties, and process requirements. The strict specifications of this standard ensure the reliability and safety of pipeline products under complex working conditions. The two main categories of this standard include S31803 and S32205, both of which are high-strength, corrosion-resistant duplex stainless steels. According to the standard, duplex stainless steel should contain a high content of nickel and nitrogen, which makes it perform well in acidic and chloride environments, resisting local corrosion, stress corrosion cracking, and pitting corrosion.


From the perspective of mechanical performance, ASTM A790 standard requires that the tensile strength (ULT) and yield strength (YS) of materials meet strict indicators to ensure stability and safety under high pressure and harsh environments. The yield strength of duplex stainless steel pipes is usually higher than 200 MPa, making them suitable for high demand application scenarios.


Under the ASTM A790 standard, duplex stainless steel seamless pipes and welded pipes have their own characteristics in material selection and production processes, which meet the needs of different application scenarios.


Seamless pipes are known for their seamless integrity without welds, providing higher pressure resistance and structural uniformity. It is usually made using extrusion or perforation rolling processes, especially suitable for critical transportation in high-pressure and high-temperature environments, such as oil and gas pipelines and core components of chemical equipment. The production of seamless pipes requires strict control of dimensional tolerances to ensure high-precision inner and outer diameters and wall thickness, providing guarantees for harsh industrial conditions.


Welded pipes are favored for their high production efficiency and customizable length. ASTM A790 stipulates that welded pipes must undergo weld heat treatment to eliminate residual stress and optimize the mechanical properties and corrosion resistance of the weld. Dual phase steel welded pipes are particularly suitable for low to medium pressure transportation scenarios, such as connecting pipelines for seawater desalination equipment, heat exchangers, and storage tank systems.

In terms of quality control, ASTM A790 pipes need to undergo non-destructive testing (NDT) and hydrostatic testing to ensure that the welds and base metal are defect free. ASTM A790 duplex stainless steel seamless and welded pipes have become indispensable materials in industrial piping systems due to their excellent performance and strict standards. We look forward to working with you to provide high-quality pipeline solutions that meet your various needs. Please feel free to contact us for more information and pricing.