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GOST 4543 40XH vs BS 970 (Part 1) 635M15

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

GOST 4543 40XH (GOST 4543-2016) and BS 970 (Part 1) 635M15 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40XH is typically used for heavy-duty gears, transmission shafts, axles, high-strength fasteners, forged machinery parts, while BS 970 (Part 1) 635M15 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. BS 970 (Part 1) 635M15 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 40XH vs BS 970 (Part 1) 635M15 is a 70.6% 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 69.9%.

Frequently Compared With GOST 4543 40XH:
GOST 4543 12HN3A UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
70.6%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property GOST 4543 40XH BS 970 (Part 1) 635M15
Standard GOST 4543-2016 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.12-0.18
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 (%) 0.45-0.75 0.40-0.80
Ni (%) 1.00-1.40 0.70-1.10
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 40XH BS 970 (Part 1) 635M15
Tensile Strength 980-1180 MPa Not specified
Yield Strength >=785 MPa Not specified
Elongation >=10% Not specified
Hardness 241-285 HB Not specified
Typical Applications
GOST 4543 40XH
heavy-duty gears, transmission shafts, axles, high-strength fasteners, forged machinery parts
BS 970 (Part 1) 635M15
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can GOST 4543 40XH Be Substituted With BS 970 (Part 1) 635M15?
GOST 4543 40XH and BS 970 (Part 1) 635M15 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 40XH
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6100 mm (232.28–240.16 in)
BS 970 (Part 1) 635M15
No active listings currently.
On M-EX Right Now
GOST 4543 40XH
2 active listings and RFQs →
BS 970 (Part 1) 635M15
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 40XH and BS 970 (Part 1) 635M15?
GOST 4543 40XH specifies Si, Cu which are not specified for BS 970 (Part 1) 635M15.
Can GOST 4543 40XH be substituted with BS 970 (Part 1) 635M15?
GOST 4543 40XH and BS 970 (Part 1) 635M15 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.