ASTM A 789

This specification covers standard requirements for gradesof nominal wall thickness, stainless steel tubing for services requiringgeneral corrosion resistance, with particular emphasis on resistance to stresscorrosion cracking. These steels are susceptible to embrittlement if used forprolonged periods at elevated temperatures. Heat and product analyses shall beperformed wherein the steel shall conform to the required chemical compositionfor carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium,molybdenum, nitrogen, copper, and others. All tubes shall be furnished in theheat-treated condition in accordance with the specified temperature and quenchconditions. When the final heat treatment is in a continuous furnace, or whenheat treated condition is obtained directly by quenching after hot forming, thenumber of tubes of the same size and from the same heat in a lot shall bedetermined from the prescribed sizes of the tubes. The material shall conformto the prescribed tensile and hardness properties. Mechanical tests such astension test, flaring test (for seamless tubes), flange test (for weldedtubes), hardness test, and reverse flattening test shall be performed on thesteel tubing. Each tube shall also be subjected to the nondestructive electrictest or the hydrostatic test.