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Duplex Pipe Specification – ASTM A789

Overview:

This specification discusses standard requirements for grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are prone to embrittlement if kept at elevated temperatures for long time periods. Heat and product analyses must be performed, and the steel must have the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, nitrogen, copper, and others. All tubes shall be furnished in the specified heat-treated condition. When the final heat treatment is in a continuous furnace, or when heat treated condition is obtained directly by quenching after hot forming, the number of tubes of the same size and from the same heat in a lot shall be determined from the prescribed sizes of the tubes. The material must have the required tensile and hardness properties. The product must undergo a tension test, flaring test (for seamless), flange test (for welded) hardness test, reverse flattening test, and either a nondestructive electric test or a hydrostatic test.

  • ┬áNote this data is for overview only. For full specification and current revisions, please contact ASTM.

 

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