ASTM A789 Seamless and Welded Duplex Steel Tubing Standard

ASTM A789/A789M-22 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service. ASTM A789 standard contains duplex and super duplex (UNS S32205, UNS S31803, UNS S32760, UNS S32750)stainless steel.

ASTM A789 Duplex Stainless Steel Tubing Advantages
The formation of intermetallic phases such as the sigma phase occurs in the temperature range 600-1000℃ and the decomposition of ferrite occurs in the range 350-500℃. The high tensile strength of duplex steel tubes also implies high fatigue strength. Due to their high chromium content, duplex seamless tubes and duplex welded tubes offer excellent corrosion resistance in many media.

ASME SA 789 ASTM A789 Tubing Test
ASTM A789 tubing undergoes numerous tests including tension test, flaring test, flange test, hardness test, and reverse flattening test. The final product is heat-treated in a continuous furnace. ASTM A789 super duplex steel tubes are also subject to an electric or hydrostatic test to check the structural integrity of the test.

ASTM A789 Tubing Supplier
HT PIPE offers grades such as duplex 2205 welded Tube, super duplex 2507 welded tube, ASTM A789 UNS S31803, ASTM A789 UNS S32205, ASTM A789 UNS S32750, ASTM A789 UNS S32760 which are used in firewalls and blast walls on offshore platforms, bridges, etc.