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IS 1570 (Part 4) 21Cr4Mo2 vs BS 970 (Part 1) 708M20

Close Alternative — 81% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 21Cr4Mo2 (IS 1570 (Part 4):1988) and BS 970 (Part 1) 708M20 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 21Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 708M20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 21Cr4Mo2 vs BS 970 (Part 1) 708M20 is a 81% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 81%.

Frequently Compared With IS 1570 (Part 4) 21Cr4Mo2:
IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 12Cr4Mo5H IS 1570 (Part 7) 10Mo6H IS 1570 (Part 7) 12Cr2Mo5V2H IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 103Cr4 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 12Cr9Mo10H GOST 4543 12HN3A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
81%
MECHANICAL MATCH
No shared data
OVERALL
81%
Specifications
Property IS 1570 (Part 4) 21Cr4Mo2 BS 970 (Part 1) 708M20
Standard IS 1570 (Part 4):1988 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) <=0.26 0.17-0.23
Si (%) 0.10-0.35 Not specified
Mn (%) 0.60-0.90 0.60-0.90
Cr (%) 0.90-1.20 0.85-1.15
Mo (%) 0.15-0.30 0.15-0.25
P (%) Not specified <=0.035
S (%) Not specified <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 21Cr4Mo2 BS 970 (Part 1) 708M20
Tensile Strength 790-990 MPa Not specified
Yield Strength >=610 MPa Not specified
Condition Sheet and strip, hardened and tempered or cold rolled and tempered Not specified
Typical Applications
IS 1570 (Part 4) 21Cr4Mo2
Not documented
BS 970 (Part 1) 708M20
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can IS 1570 (Part 4) 21Cr4Mo2 Be Substituted With BS 970 (Part 1) 708M20?
IS 1570 (Part 4) 21Cr4Mo2 and BS 970 (Part 1) 708M20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
On M-EX Right Now
IS 1570 (Part 4) 21Cr4Mo2
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BS 970 (Part 1) 708M20
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 21Cr4Mo2 and BS 970 (Part 1) 708M20?
IS 1570 (Part 4) 21Cr4Mo2 specifies Si which is not specified for BS 970 (Part 1) 708M20. BS 970 (Part 1) 708M20 specifies P, S which are not specified for IS 1570 (Part 4) 21Cr4Mo2.
Can IS 1570 (Part 4) 21Cr4Mo2 be substituted with BS 970 (Part 1) 708M20?
IS 1570 (Part 4) 21Cr4Mo2 and BS 970 (Part 1) 708M20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.