Grade X12CrNiCoMoWMnNNb21-20-20-3-3-2
ISO Numeric Designation 4971-314-79-I
Corresponding Standard ISO 15510-2014
Stainless Steels-Chemical Composition
Classification Austenitic Stainless Steel
X12CrNiCoMoWMnNNb21-20-20-3-3-2 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo N W Nb Co
Minimum Value 0.08 - 1 - - 20 19 2.5 0.1 2 0.75 18.5
Maximum Value 0.16 1 2 0.035 0.015 22.5 21 3.5 0.2 3 1.25 21
Approximate Comparison Table Austenitic Stainless Steel
Japan International Organization for Standardization European Standard
JIS ISO Numerical Grade Numerical Grade
SUH661 X12CrNiCoMoWMnNNb21-20-20-3-3-2 4971-314-79-I 1.4971

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