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GOST 5950 4H5MFS1 vs BS 970 (Part 1) 905M39

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

GOST 5950 4H5MFS1 (GOST 5950-2000) and BS 970 (Part 1) 905M39 (BS 970 (Part 1):1991) are both steel grades. GOST 5950 4H5MFS1 is classified under Tool & Die Steels, while BS 970 (Part 1) 905M39 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GOST 5950 4H5MFS1 is typically used for used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts., while BS 970 (Part 1) 905M39 is commonly used for steel for surface hardening by nitriding (section three). BS 970 (Part 1) 905M39 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 5950 4H5MFS1 vs BS 970 (Part 1) 905M39 is a 65.9% 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 GOST 5950 4H5MFS1:
GB/T 1299 4Cr5MoSiV1 GOST 5950 4H5MFS EN ISO 683-17 100Cr6 GB/T 1299 4Cr5MoSiV EN ISO 4957 1.2316 AISI 52100 IS 1570 (Part 6) 133T3 DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 IS 3748 103T3 IS 1570 (Part 6) 103T3 IS 3748 118T3
Match Breakdown
CHEMISTRY MATCH
65.9%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GOST 5950 4H5MFS1 BS 970 (Part 1) 905M39
Standard GOST 5950-2000 BS 970 (Part 1):1991
Category Tool & Die Steels Alloy Steel
C (%) 0.35-0.45 0.35-0.43
Cr (%) 4.5-5.5 1.40-1.80
Mo (%) 1.2-1.6 0.15-0.25
V (%) 0.3-0.6 Not specified
Si (%) 0.8-1.2 Not specified
Mn (%) Not specified 0.40-0.65
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GOST 5950 4H5MFS1 BS 970 (Part 1) 905M39
Tensile Strength 1350-1650 MPa Not specified
Yield Strength 1150 MPa min Not specified
Elongation 9% min Not specified
Hardness 44-50 HRC Not specified
Typical Applications
GOST 5950 4H5MFS1
Used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.
BS 970 (Part 1) 905M39
Steel for surface hardening by nitriding (section three)
Key Differences
Can GOST 5950 4H5MFS1 Be Substituted With BS 970 (Part 1) 905M39?
GOST 5950 4H5MFS1 and BS 970 (Part 1) 905M39 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
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)
BS 970 (Part 1) 905M39
No active listings currently.
On M-EX Right Now
GOST 5950 4H5MFS1
2 active listings and RFQs →
BS 970 (Part 1) 905M39
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 5950 4H5MFS1 and BS 970 (Part 1) 905M39?
Different category: GOST 5950 4H5MFS1 is Tool & Die Steels, BS 970 (Part 1) 905M39 is Alloy Steel. GOST 5950 4H5MFS1 specifies V, Si which are not specified for BS 970 (Part 1) 905M39. BS 970 (Part 1) 905M39 specifies Mn which is not specified for GOST 5950 4H5MFS1.
Can GOST 5950 4H5MFS1 be substituted with BS 970 (Part 1) 905M39?
GOST 5950 4H5MFS1 and BS 970 (Part 1) 905M39 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.