USA UNS K90901
ASTM
Specification or Grade
F 91
Corresponding Standard ASTM A182/A182M-2018
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Classification Alloy Steel
Properties Corrosion Resistance
Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Ni Mo N Ti V Nb Zr Al
Type 1 Minimum Value 0.08 0.2 0.3 - - 8 - 0.85 0.03 - 0.18 0.06 - -
Maximum Value 0.12 0.5 0.6 0.02 0.01 9.5 0.4 1.05 0.07 0.01 0.25 0.1 0.01 0.02
  Component C Si Mn P S Cr Ni Cu Mo As N Ti W V Nb Zr B Al Sn Sb
Type 2 Minimum Value 0.08 0.2 0.3 - - 8 - - 0.85 - 0.035 - - 0.18 0.06 - - - - -
Maximum Value 0.12 0.4 0.5 0.02 0.005 9.5 0.2 0.1 1.05 0.01 0.07 0.01 0.05 0.25 0.1 0.01 0.001 0.02 0.01 0.003
  Component C Si Mn P S Cr Ni Cu Mo As N Ti W V Nb Zr B Al Sn Sb
Product* Minimum Value 0.07 0.2 0.3 - - 8 - - 0.8 - 0.035 - - 0.16 0.05 - - - - -
Maximum Value 0.13 0.4 0.5 0.02 0.005 9.5 0.2 0.1 1.05 0.01 0.07 0.01 0.05 0.27 0.11 0.01 0.001 0.02 0.01 0.003
Mechanical Properties
Tensile Strength
σb
Mpa
Specified Plastic Yield Strength
Rp0.2
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Hardness
HBW
≥620 ≥415 ≥20 ≥40 190~248

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!