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ASTM A681:2008 P21 Steel: Specifications & Listings

ASTM A681:2008 P21: P21: mold steel (UNS T51621). Specified in A681:2008.

Category: Tool & Die Steels
Grade Details
GradeASTM A681:2008 P21
Standard ASTM A681:2008
ApplicationsTools, dies and fixtures (clause 1.2)
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 1570 (Part 6) T30Ni16Cr5 IS 1570 (Part 6):1996 Related Material
IS 3748 T30Ni16Cr5 IS 3748:1990 Related Material
IS 5517 30Ni13Cr5 IS 5517:1993 Related Material
GB/T 3077 20Cr2Ni4 GB/T 3077:2015 Related Material
GB/T 699 20 GB/T 699:2015 Related Material
SAE J404 50B46 SAE J404:2009 Related Material
GB/T 699 20Mn GB/T 699:2015 Related Material
GB/T 3077 20CrNi3 GB/T 3077:2015 Related Material
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn P S Si Cr V Ni Al
0.18-0.22 0.20-0.40 <=0.030 <=0.030 0.20-0.40 0.20-0.30 0.15-0.25 3.90-4.25 1.05-1.25

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