ASTM A 312 Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

Grade: TP321H

UNS Designation: S32109

Chemical Requirements(%)

C: 0.04-0.10

Mn: ≤2.00

P: ≤0.045

S: ≤0.030

Si: ≤1.00

Cr: 17.0-19.0

Ni: 9.0-12.0

Ti: 4×(C+N)-0.70

N: ≤0.10

Heat Treating Temperature

Cold finished, ≥1100 °C

Hot finished, ≥1050 °C

Tensile Requirements

For welded pipe,

Tensile Strength, ≥515Mpa

Yield Strength, ≥205MPa

For seamless pipe,

• When t ≤9.50 mm,

Tensile Strength, ≥515Mpa

Yield Strength, ≥205MPa

• When t ＞9.50 mm,

Tensile Strength, ≥485Mpa

Yield Strength, ≥170MPa

Elongation in 2 in. or 50 mm (or 4D) (%)

Longitudinal, ≥35

Transverse, ≥25