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IS 1570 (Part 6) T55Si7 vs BS 4659 BO2

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 6) T55Si7 (IS 1570 (Part 6):1996) and BS 4659 BO2 (BS 4659:1989) are both steel grades. Both fall under the Tool & Die Steels category. IS 1570 (Part 6) T55Si7 is defined under Bureau of Indian Standards (IS), originating from India, while BS 4659 BO2 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 6) T55Si7 vs BS 4659 BO2 is a 79.5% 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 69.9%.

Frequently Compared With IS 1570 (Part 6) T55Si7:
EN ISO 683-17 100Cr6 IS 1570 (Part 6) 55T8 EN ISO 4957 1.2316 GOST 5950 3H2W8F DIN EN ISO 4957 1.2379 IS 1570 (Part 6) 133T3 IS 1570 (Part 6) 60T6 IS 1570 (Part 6) 118T3 GB/T 1299 3Cr2W8V IS 1570 (Part 6) 50T8 IS 1570 (Part 6) 103T3 GB/T 1299 4Cr5MoSiV
Match Breakdown
CHEMISTRY MATCH
79.5%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property IS 1570 (Part 6) T55Si7 BS 4659 BO2
Standard IS 1570 (Part 6):1996 BS 4659:1989
Category Tool & Die Steels Tool & Die Steels
C (%) 0.50-0.60 0.85–0.95
Si (%) 1.50-2.00 ≤0.30
Mn (%) 0.80-1.00 1.40–1.80
P (%) <=0.035 Not specified
S (%) <=0.035 Not specified
Cr (%) Not specified ≤0.30
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 6) T55Si7 BS 4659 BO2
Hardness HRC (hardened) Not specified 57–62
Hardness HB (annealed) Not specified ≤217
Typical Applications
IS 1570 (Part 6) T55Si7
Not documented
BS 4659 BO2
Taps, drills, reamers, punches, gauges
Key Differences
Can IS 1570 (Part 6) T55Si7 Be Substituted With BS 4659 BO2?
IS 1570 (Part 6) T55Si7 and BS 4659 BO2 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
IS 1570 (Part 6) T55Si7
No active listings currently.
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)
On M-EX Right Now
IS 1570 (Part 6) T55Si7
0 active listings and RFQs →
BS 4659 BO2
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 6) T55Si7 and BS 4659 BO2?
IS 1570 (Part 6) T55Si7 specifies P, S which are not specified for BS 4659 BO2. BS 4659 BO2 specifies Cr which is not specified for IS 1570 (Part 6) T55Si7.
Can IS 1570 (Part 6) T55Si7 be substituted with BS 4659 BO2?
IS 1570 (Part 6) T55Si7 and BS 4659 BO2 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.