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IS 1570 (Part 4):1988 21Cr4Mo2 Steel: Specifications & Listings

IS 1570 (Part 4):1988 21Cr4Mo2: 21Cr4Mo2: alloy steel (constructional or spring group) with specified chemical composition. Specified in IS 1570 (Part 4):1988.

Category: Alloy Steel
Grade Details
GradeIS 1570 (Part 4):1988 21Cr4Mo2
Standard IS 1570 (Part 4):1988
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 4367 21Cr4Mo2 IS 4367:1991 India 3 listings, 1 RFQ →
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
EN 10084 18CrMo4 EN 10084:2008 Strong Match
EN 10084 18CrMoS4 EN 10084:2008 Strong Match
BS 970 (Part 3) 708M40 BS 970 (Part 3):1991 Close Alternative
IS 1570 (Part 4) 30Cr4Mo2 IS 1570 (Part 4):1988 Close Alternative
BS 970 (Part 1) 708H20 BS 970 (Part 1):1991 Close Alternative
BS 970 (Part 1) 708M20 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 708H20 BS 970 (Part 1):1983 Close Alternative
IS 11169 (Part 1) 40Cr4Mo3 IS 11169 (Part 1):2022 Close Alternative
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Si Mn Cr Mo
<=0.26 0.10-0.35 0.60-0.90 0.90-1.20 0.15-0.30
Mechanical Properties
Tensile Strength 790-990 MPa
Yield Strength >=610 MPa
Condition Sheet and strip, hardened and tempered or cold rolled and tempered

More data from IS 1570 (Part 4):1988

From the standard
Tensile limits, steel sheet and strip 3 conditions
ConditionTensile strength (MPa)0.2 % proof stress, min (MPa)Brinell hardness (HBS)
Softened--max 212
Hardened and tempered or cold rolled and tempered790-990610-
Hardened and tempered1140-1340990-
Source: IS 1570 (Part 4):1988, Table 10
Tensile limits, tubes 4 conditions
ConditionTensile strength, min (MPa)0.2 % proof stress, min (MPa)
Normalized and tempered, hardened and tempered or cold drawn and tempered550450
Normalized and tempered, hardened and tempered or cold drawn and tempered630570
Hardened and tempered or cold drawn and tempered710590
Hardened and tempered or cold drawn and tempered790640
Elongation printed as 9 310 over actual tensile strength (MPa).
Source: IS 1570 (Part 4):1988, Table 11

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