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BS 4659 BPO2 vs BS 970 EN353

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

BS 4659 BPO2 (BS 4659:1989) and BS 970 EN353 (BS 970:1955) are both steel grades. BS 4659 BPO2 is classified under Tool & Die Steels, while BS 970 EN353 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. BS 4659 BPO2 is typically used for injection mould cavities, zinc die casting dies, while BS 970 EN353 is commonly used for heavily loaded gears, cams, camshafts. BS 4659 BPO2 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN353 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 4659 BPO2 vs BS 970 EN353 is a 67.7% 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 BPO2:
GOST 5950 3H2W8F EN ISO 4957 1.2316 EN ISO 683-17 100Cr6 GOST 5950 4H5MFS1 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
Other Tool & Die Steels Grades to Compare With BS 4659 BPO2:
IS 3748 103T3
Match Breakdown
CHEMISTRY MATCH
67.7%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property BS 4659 BPO2 BS 970 EN353
Standard BS 4659:1989 BS 970:1955
Category Tool & Die Steels Alloy Steel
C (%) 0.07–0.12 <=0.20
Mn (%) 0.10–0.40 0.50-1.00
Cr (%) 0.75–1.25 0.75-1.25
Mo (%) 0.15–0.40 0.08-0.15
Ni (%) 0.10–0.50 1.00-1.50
Si (%) Not specified <=0.35
S (%) Not specified <=0.050
P (%) Not specified <=0.050
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 BS 970 EN353
Hardness HRC (case hardened) 58–64 Not specified
Hardness HRC (core) 20–30 Not specified
Tensile Strength Not specified ≥1004 MPa (65 tons/sq in, converted)
Elongation Not specified ≥12%
Condition Not specified core, min (lowest-strength condition of the standard)
Typical Applications
BS 4659 BPO2
Injection mould cavities, zinc die casting dies
BS 970 EN353
Heavily loaded gears, cams, camshafts
Key Differences
Can BS 4659 BPO2 Be Substituted With BS 970 EN353?
BS 4659 BPO2 and BS 970 EN353 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)
BS 970 EN353
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–6300 mm (204.72–248.03 in)
On M-EX Right Now
BS 4659 BPO2
2 active listings and RFQs →
BS 970 EN353
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BPO2 and BS 970 EN353?
Different category: BS 4659 BPO2 is Tool & Die Steels, BS 970 EN353 is Alloy Steel. BS 970 EN353 specifies Si, S, P which are not specified for BS 4659 BPO2.
Can BS 4659 BPO2 be substituted with BS 970 EN353?
BS 4659 BPO2 and BS 970 EN353 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.