ASTM A182 – Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High Temperature Service

Grade: F51 (ferritic-austenitic stainless steel)
UNS number： S31803

Chemical Requirements, max，%
C: ≤0.030
Mn:≤2.00
P: ≤0.030
S: ≤0.020
Si: ≤1.00
Cr: 21.0-23.0
Ni: 4.5-6.5
Mo:2.5-3.5
N: 0.08-0.20

Heat treatment
Solution treat and quench: ≥1020 °C
Cooling media: liquid
Quenching cool below 260℃

Tensile Requirements
Tensile Strength: ≥620MPa
Yield Strength: ≥450MPa
Elongation2 in. or 50 mm (or 4D): ≥25%
Reduction of Area: ≥45%