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BS 4659 BH21 vs IS 3748 103T3

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

BS 4659 BH21 (BS 4659:1989) and IS 3748 103T3 (IS 3748:1990) are both steel grades. Both fall under the Tool & Die Steels category. BS 4659 BH21 is typically used for hot extrusion dies, brass/bronze forging dies, while IS 3748 103T3 is commonly used for cold work tools and dies for blanking, trimming, chipping and shearing. BS 4659 BH21 is defined under British Standards (BS), originating from United Kingdom, while IS 3748 103T3 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 4659 BH21 vs IS 3748 103T3 is a 61.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 4659 BH21:
GB/T 1299 3Cr2W8V GOST 5950 4H5MFS1 EN ISO 4957 1.2316 GOST 5950 3H2W8F GOST 5950 4H5MFS AISI 52100 EN ISO 683-17 100Cr6 DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV1 DIN EN ISO 4957 1.2344 GB/T 1299 4Cr5MoSiV IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
61.2%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 4659 BH21 IS 3748 103T3
Standard BS 4659:1989 IS 3748:1990
Category Tool & Die Steels Tool & Die Steels
C (%) 0.26–0.36 0.95-1.10
Mn (%) 0.15–0.40 <=0.40
Cr (%) 3.00–3.75 Not specified
W (%) 8.50–10.00 Not specified
V (%) 0.30–0.60 Not specified
Si (%) Not specified 0.10-0.30
S (%) Not specified <=0.035
P (%) Not specified <=0.035
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 BH21 IS 3748 103T3
Hardness HRC (hardened) 36–54 Not specified
Hardness HB (annealed) ≤229 Not specified
Hardness Not specified <=220 HB
Condition Not specified Annealed (maximum Brinell hardness)
Typical Applications
BS 4659 BH21
Hot extrusion dies, brass/bronze forging dies
IS 3748 103T3
Cold work tools and dies for blanking, trimming, chipping and shearing
Key Differences
Can BS 4659 BH21 Be Substituted With IS 3748 103T3?
BS 4659 BH21 and IS 3748 103T3 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 BH21
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 4400–4600 mm (173.23–181.1 in)
IS 3748 103T3
No active listings currently.
On M-EX Right Now
BS 4659 BH21
2 active listings and RFQs →
IS 3748 103T3
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BH21 and IS 3748 103T3?
BS 4659 BH21 specifies Cr, W, V which are not specified for IS 3748 103T3. IS 3748 103T3 specifies Si, S, P which are not specified for BS 4659 BH21.
Can BS 4659 BH21 be substituted with IS 3748 103T3?
BS 4659 BH21 and IS 3748 103T3 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.