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BS 4659 BPO2 vs GOST 5950 4H5MFS1

Minimal Match — 34.2% match based on chemical composition and mechanical property overlap.

BS 4659 BPO2 (BS 4659:1989) and GOST 5950 4H5MFS1 (GOST 5950-2000) are both steel grades. Both fall under the Tool & Die Steels category. BS 4659 BPO2 is typically used for injection mould cavities, zinc die casting dies, while GOST 5950 4H5MFS1 is commonly used for used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.. BS 4659 BPO2 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, BS 4659 BPO2 vs GOST 5950 4H5MFS1 is a 51.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 34.2%.

Frequently Compared With BS 4659 BPO2:
GOST 5950 3H2W8F EN ISO 4957 1.2316 EN ISO 683-17 100Cr6 GB/T 1299 4Cr5MoSiV1 AISI 52100 DIN EN ISO 4957 1.2344 GOST 5950 4H5MFS DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV GB/T 1299 3Cr2W8V IS 1570 (Part 6) 103T3
Other Tool & Die Steels Grades to Compare With BS 4659 BPO2:
IS 3748 103T3
Match Breakdown
CHEMISTRY MATCH
51.4%
MECHANICAL MATCH
0%
OVERALL
34.2%
Specifications
Property BS 4659 BPO2 GOST 5950 4H5MFS1
Standard BS 4659:1989 GOST 5950-2000
Category Tool & Die Steels Tool & Die Steels
C (%) 0.07–0.12 0.35-0.45
Mn (%) 0.10–0.40 Not specified
Cr (%) 0.75–1.25 4.5-5.5
Mo (%) 0.15–0.40 1.2-1.6
Ni (%) 0.10–0.50 Not specified
V (%) Not specified 0.3-0.6
Si (%) Not specified 0.8-1.2
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 BPO2 GOST 5950 4H5MFS1
Hardness HRC (case hardened) 58–64 Not specified
Hardness HRC (core) 20–30 Not specified
Tensile Strength Not specified 1350-1650 MPa
Yield Strength Not specified 1150 MPa min
Elongation Not specified 9% min
Hardness Not specified 44-50 HRC
Typical Applications
BS 4659 BPO2
Injection mould cavities, zinc die casting dies
GOST 5950 4H5MFS1
Used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.
Key Differences
Can BS 4659 BPO2 Be Substituted With GOST 5950 4H5MFS1?
BS 4659 BPO2 and GOST 5950 4H5MFS1 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 BPO2
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2700–2900 mm (106.3–114.17 in)
GOST 5950 4H5MFS1
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3000–3100 mm (118.11–122.05 in)
On M-EX Right Now
BS 4659 BPO2
2 active listings and RFQs →
GOST 5950 4H5MFS1
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BPO2 and GOST 5950 4H5MFS1?
BS 4659 BPO2 specifies Mn, Ni which are not specified for GOST 5950 4H5MFS1. GOST 5950 4H5MFS1 specifies V, Si which are not specified for BS 4659 BPO2.
Can BS 4659 BPO2 be substituted with GOST 5950 4H5MFS1?
BS 4659 BPO2 and GOST 5950 4H5MFS1 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.