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BS 970 (Part 1) 709M40 vs IS 1570 (Part 4) 10Cr20Mo6

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) and IS 1570 (Part 4) 10Cr20Mo6 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 709M40 is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 4) 10Cr20Mo6 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 (Part 1) 709M40 vs IS 1570 (Part 4) 10Cr20Mo6 is a 56.3% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 (Part 1) 709M40:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
56.3%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property BS 970 (Part 1) 709M40 IS 1570 (Part 4) 10Cr20Mo6
Standard BS 970 (Part 1):1991 IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 <=0.15
Mn (%) 0.70-1.00 0.40-0.70
Cr (%) 0.90-1.20 4.0-6.0
Mo (%) 0.25-0.35 0.45-0.65
Si (%) Not specified <=0.50
Ni (%) Not specified <=0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
IS 1570 (Part 4) 10Cr20Mo6
Not documented
Key Differences
Can BS 970 (Part 1) 709M40 Be Substituted With IS 1570 (Part 4) 10Cr20Mo6?
BS 970 (Part 1) 709M40 and IS 1570 (Part 4) 10Cr20Mo6 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
BS 970 (Part 1) 709M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6600–6800 mm (259.84–267.72 in)
IS 1570 (Part 4) 10Cr20Mo6
No active listings currently.
On M-EX Right Now
BS 970 (Part 1) 709M40
2 active listings and RFQs →
IS 1570 (Part 4) 10Cr20Mo6
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 709M40 and IS 1570 (Part 4) 10Cr20Mo6?
IS 1570 (Part 4) 10Cr20Mo6 specifies Si, Ni which are not specified for BS 970 (Part 1) 709M40.
Can BS 970 (Part 1) 709M40 be substituted with IS 1570 (Part 4) 10Cr20Mo6?
BS 970 (Part 1) 709M40 and IS 1570 (Part 4) 10Cr20Mo6 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.