USA UNS S81921
Corresponding Standard ASTM A790/A790M-2024
Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
Classification Duplex Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N
Minimum Value - - 2 - - 19 2 1 0.14
Maximum Value 0.03 1 4 0.04 0.03 22 4 2 0.2
Mechanical Properties
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Hardness
HBW
≥620 ≥450 ≥25 HBW: ≤290
HRC: ≤30

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