ASTM A376 TP321 Austenitic Steel Pipe
ASTM A376 TP321 Seamless Austenitic Steel Pipe
Standard Specification for
Seamless Austenitic Steel Pipe for High-Temperature Service
ASTM A376 TP321 Steel Pipe covers seamless austenitic steel pipe intended for high-temperature service.
ASTM A376 TP321 Seamless Austenitic Steel Pipe was originally developed for use for piping in the central stations of electric-power generating thermal plants. However, its use is not restricted to such applications and it may be used in other applications for which the attributes ofthe materials
ASTM A376 TP321 Steel Pipe have lower strength requirements for nominal wall thicknesses greater than 3 ⁄ 8 in. [9.5mm].
All pipe shall be furnished in the heat-treated condition ,each pipe shall be stenciled “HT-O.”
ASTM A376 TP321 Seamless Austenitic Steel Pipe,heat treatment shall consist of heating to a minimum temperature of 1900 °F [1040 °C] and quenching in water or rapidly cooling by other means.
A solution annealing temperature above 1950 °F [1065°C] may impair the resistance to intergranular corrosion after subsequent exposure to sensitizing conditions in ASTM A376 TP321 Seamless Austenitic Steel Pipe
Composition, % A
B： The titanium content shall be not less than five times the carbon content and not more than 0.70 %.
||Tensile A strength,
min, ksi [MPa]
|Elongation in 2 in. or 50 mm (or 4D) min, %
Hydrostatic or Nondestructive Electric Test
Each pipe shall be subjected to the Nondestructive Electric Test or the Hydrostatic Test. Unless specified by the purchaser, either test may be used at the option ofthe producer.
Hydrostatic Test—Each length of finished pipe shall be subjected to the hydrostatic test in accordance with Specification A999/A999M.