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GOST 4543 40X vs BS 970 (Part 1) 637M17

Related Material — 66.4% match based on chemical composition and mechanical property overlap.

GOST 4543 40X (GOST 4543-2016) and BS 970 (Part 1) 637M17 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40X is typically used for gears, shafts, axles, spindles, studs, automotive components, while BS 970 (Part 1) 637M17 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. BS 970 (Part 1) 637M17 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 40X vs BS 970 (Part 1) 637M17 is a 66.4% 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 66.4%.

Frequently Compared With GOST 4543 40X:
GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
66.4%
MECHANICAL MATCH
No shared data
OVERALL
66.4%
Specifications
Property GOST 4543 40X BS 970 (Part 1) 637M17
Standard GOST 4543-2016 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.14-0.20
Si (%) 0.17-0.37 Not specified
Mn (%) 0.50-0.80 0.60-0.90
S (%) <=0.035 <=0.040
P (%) <=0.035 <=0.035
Cr (%) 0.80-1.10 0.60-1.00
Ni (%) <=0.30 0.85-1.25
Cu (%) <=0.30 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GOST 4543 40X BS 970 (Part 1) 637M17
Tensile Strength 980-1180 MPa Not specified
Yield Strength >=785 MPa Not specified
Elongation >=10% Not specified
Hardness 229-285 HB Not specified
Typical Applications
GOST 4543 40X
gears, shafts, axles, spindles, studs, automotive components
BS 970 (Part 1) 637M17
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can GOST 4543 40X Be Substituted With BS 970 (Part 1) 637M17?
GOST 4543 40X and BS 970 (Part 1) 637M17 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 4543 40X
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6000 mm (200.79–236.22 in)
BS 970 (Part 1) 637M17
No active listings currently.
On M-EX Right Now
GOST 4543 40X
2 active listings and RFQs →
BS 970 (Part 1) 637M17
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 40X and BS 970 (Part 1) 637M17?
GOST 4543 40X specifies Si, Cu which are not specified for BS 970 (Part 1) 637M17.
Can GOST 4543 40X be substituted with BS 970 (Part 1) 637M17?
GOST 4543 40X and BS 970 (Part 1) 637M17 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.