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IS 1570 (Part 4):1988 21C10BT Steel: Specifications & Listings

IS 1570 (Part 4):1988 21C10BT: 21C10BT: boron treated alloy steel with specified chemical composition. Specified in IS 1570 (Part 4):1988.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 4):1988 21C10BT
Standard IS 1570 (Part 4):1988
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 11169 (Part 1) 21C10BT IS 11169 (Part 1):2022 India No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 1570 (Part 4) 26C10BT IS 1570 (Part 4):1988 Strong Match
BS 970 EN3C BS 970:1955 Strong Match
SAE J403 1022 SAE J403:2014 Strong Match
JIS G4051 S20C JIS G4051:2009 Strong Match
KS D3752 SM20C KS D 3752:2024 Strong Match
IS 1570 (Part 4) 34C14BT IS 1570 (Part 4):1988 Close Alternative
SAE J403 1022 SAE J403:2001 Close Alternative
SAE J403 1022 SAE J403:2009 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 B
0.18-0.23 0.15-0.30 0.80-1.1 0.0005-0.003

More data from IS 1570 (Part 4):1988

From the standard
Hardenability band (end quench test) 10 distances
Distance from quenched end (mm)Upper limit (HRC)Lower limit (HRC)
1.584841
3.104740
4.764638
6.354430
7.934020
9.5235-
11.1132-
12.727-
14.2922-
15.8720-
Tentative limits for specified hardenability of boron steels.
Source: IS 1570 (Part 4):1988, Table 12

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