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BS 4659 BH21 vs AISI 52100

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

BS 4659 BH21 (BS 4659:1989) and AISI 52100 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 AISI 52100 is commonly used for anti-friction bearings, ball screws, precision rollers. BS 4659 BH21 is defined under British Standards (BS), originating from United Kingdom, while AISI 52100 is defined under AISI, originating from United States.

As per chemical composition, BS 4659 BH21 vs AISI 52100 is a 62.2% 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 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
Other Tool & Die Steels Grades to Compare With BS 4659 BH21:
IS 3748 103T3
Match Breakdown
CHEMISTRY MATCH
62.2%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 4659 BH21 AISI 52100
Standard BS 4659:1989 AISI
Category Tool & Die Steels Tool & Die Steels
C (%) 0.26–0.36 0.93–1.05
Mn (%) 0.15–0.40 0.25–0.45
Cr (%) 3.00–3.75 1.35–1.60
W (%) 8.50–10.00 Not specified
V (%) 0.30–0.60 Not specified
Si (%) Not specified 0.15–0.35
S (%) Not specified ≤0.025
P (%) Not specified ≤0.025
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 AISI 52100
Hardness HRC (hardened) 36–54 Not specified
Hardness HB (annealed) ≤229 Not specified
Tensile Strength Not specified ≥620 MPa (annealed)
Hardness HRC Not specified 60–66 (hardened)
Hardness HB Not specified 179–229 (annealed)
Typical Applications
BS 4659 BH21
Hot extrusion dies, brass/bronze forging dies
AISI 52100
Anti-friction bearings, ball screws, precision rollers
Key Differences
Can BS 4659 BH21 Be Substituted With AISI 52100?
BS 4659 BH21 and AISI 52100 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)
AISI 52100
Round Bar → (3 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3000–3200 mm (118.11–125.98 in)
On M-EX Right Now
BS 4659 BH21
2 active listings and RFQs →
AISI 52100
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BH21 and AISI 52100?
BS 4659 BH21 specifies W, V which are not specified for AISI 52100. AISI 52100 specifies Si, S, P which are not specified for BS 4659 BH21.
Can BS 4659 BH21 be substituted with AISI 52100?
BS 4659 BH21 and AISI 52100 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.