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BS 970 EN40B vs IS 1570 (Part 4) 20Cr20Mo6

Close Alternative — 76.9% match based on chemical composition and mechanical property overlap.

BS 970 EN40B (BS 970:1955) and IS 1570 (Part 4) 20Cr20Mo6 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN40B is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 4) 20Cr20Mo6 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 EN40B vs IS 1570 (Part 4) 20Cr20Mo6 is a 76.9% 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 76.9%.

Frequently Compared With BS 970 EN40B:
IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
76.9%
MECHANICAL MATCH
No shared data
OVERALL
76.9%
Specifications
Property BS 970 EN40B IS 1570 (Part 4) 20Cr20Mo6
Standard BS 970:1955 IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.20-0.30 0.15-0.25
Si (%) 0.10-0.35 <=0.50
Mn (%) 0.40-0.65 0.40-0.70
Ni (%) <=0.40 <=0.30
Cr (%) 2.90-3.50 4.0-6.0
Mo (%) 0.40-0.70 0.45-0.65
S (%) <=0.050 Not specified
P (%) <=0.050 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN40B IS 1570 (Part 4) 20Cr20Mo6
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥525 MPa (34 tons/sq in, converted) Not specified
Elongation ≥22% Not specified
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard) Not specified
Key Differences
Can BS 970 EN40B Be Substituted With IS 1570 (Part 4) 20Cr20Mo6?
BS 970 EN40B and IS 1570 (Part 4) 20Cr20Mo6 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.
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BS 970 EN40B
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IS 1570 (Part 4) 20Cr20Mo6
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Frequently Asked Questions
What is the difference between BS 970 EN40B and IS 1570 (Part 4) 20Cr20Mo6?
BS 970 EN40B specifies S, P which are not specified for IS 1570 (Part 4) 20Cr20Mo6.
Can BS 970 EN40B be substituted with IS 1570 (Part 4) 20Cr20Mo6?
BS 970 EN40B and IS 1570 (Part 4) 20Cr20Mo6 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.