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BS 4659 BO2 vs IS 1570 (Part 4) 36Si7

Related Material — 65% match based on chemical composition and mechanical property overlap.

BS 4659 BO2 (BS 4659:1989) and IS 1570 (Part 4) 36Si7 (IS 1570 (Part 4):1988) are both steel grades. BS 4659 BO2 is classified under Tool & Die Steels, while IS 1570 (Part 4) 36Si7 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. BS 4659 BO2 is defined under British Standards (BS), originating from United Kingdom, while IS 1570 (Part 4) 36Si7 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 4659 BO2 vs IS 1570 (Part 4) 36Si7 is a 81.1% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With BS 4659 BO2:
GOST 5950 4H5MFS1 AISI 52100 EN ISO 683-17 100Cr6 EN ISO 4957 1.2316 DIN EN ISO 4957 1.2379 DIN EN ISO 4957 1.2344 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV GOST 5950 4H5MFS GB/T 1299 4Cr5MoSiV1 IS 1570 (Part 6) 55T8
Match Breakdown
CHEMISTRY MATCH
81.1%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property BS 4659 BO2 IS 1570 (Part 4) 36Si7
Standard BS 4659:1989 IS 1570 (Part 4):1988
Category Tool & Die Steels Alloy Steel
C (%) 0.85–0.95 0.33-0.40
Mn (%) 1.40–1.80 0.80-1.00
Cr (%) ≤0.30 Not specified
Si (%) ≤0.30 1.50-2.00
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 4659 BO2 IS 1570 (Part 4) 36Si7
Hardness HRC (hardened) 57–62 Not specified
Hardness HB (annealed) ≤217 Not specified
Typical Applications
BS 4659 BO2
Taps, drills, reamers, punches, gauges
IS 1570 (Part 4) 36Si7
Not documented
Key Differences
Can BS 4659 BO2 Be Substituted With IS 1570 (Part 4) 36Si7?
BS 4659 BO2 and IS 1570 (Part 4) 36Si7 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 4659 BO2
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3100–3500 mm (122.05–137.8 in)
IS 1570 (Part 4) 36Si7
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On M-EX Right Now
BS 4659 BO2
2 active listings and RFQs →
IS 1570 (Part 4) 36Si7
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Frequently Asked Questions
What is the difference between BS 4659 BO2 and IS 1570 (Part 4) 36Si7?
Different category: BS 4659 BO2 is Tool & Die Steels, IS 1570 (Part 4) 36Si7 is Alloy Steel. BS 4659 BO2 specifies Cr which is not specified for IS 1570 (Part 4) 36Si7.
Can BS 4659 BO2 be substituted with IS 1570 (Part 4) 36Si7?
BS 4659 BO2 and IS 1570 (Part 4) 36Si7 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.