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GOST 4543 40HNMA vs BS 970 (Part 1) 817M40

Close Alternative — 75.6% match based on chemical composition and mechanical property overlap.

GOST 4543 40HNMA (GOST 4543-2016) and BS 970 (Part 1) 817M40 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40HNMA is typically used for used for gears, shafts, spindles, connecting rods, and aerospace parts., while BS 970 (Part 1) 817M40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. BS 970 (Part 1) 817M40 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 40HNMA vs BS 970 (Part 1) 817M40 is a 75.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 75.6%.

Frequently Compared With GOST 4543 40HNMA:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4
Match Breakdown
CHEMISTRY MATCH
75.6%
MECHANICAL MATCH
No shared data
OVERALL
75.6%
Specifications
Property GOST 4543 40HNMA BS 970 (Part 1) 817M40
Standard GOST 4543-2016 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.36-0.44
Cr (%) 0.6-0.9 1.00-1.40
Ni (%) 1.25-1.65 1.30-1.70
Mo (%) 0.15-0.3 0.20-0.35
Mn (%) 0.5-0.8 0.45-0.70
Si (%) 0.17-0.37 Not specified
P (%) Not specified <=0.035
S (%) Not specified <=0.040
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 40HNMA BS 970 (Part 1) 817M40
Tensile Strength 930-1180 MPa Not specified
Yield Strength 785 MPa min Not specified
Elongation 12% min Not specified
Hardness 269-341 HB Not specified
Typical Applications
GOST 4543 40HNMA
Used for gears, shafts, spindles, connecting rods, and aerospace parts.
BS 970 (Part 1) 817M40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can GOST 4543 40HNMA Be Substituted With BS 970 (Part 1) 817M40?
GOST 4543 40HNMA and BS 970 (Part 1) 817M40 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GOST 4543 40HNMA
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6000–6000 mm (236.22–236.22 in)
BS 970 (Part 1) 817M40
No active listings currently.
On M-EX Right Now
GOST 4543 40HNMA
2 active listings and RFQs →
BS 970 (Part 1) 817M40
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Frequently Asked Questions
What is the difference between GOST 4543 40HNMA and BS 970 (Part 1) 817M40?
GOST 4543 40HNMA specifies Si which is not specified for BS 970 (Part 1) 817M40. BS 970 (Part 1) 817M40 specifies P, S which are not specified for GOST 4543 40HNMA.
Can GOST 4543 40HNMA be substituted with BS 970 (Part 1) 817M40?
GOST 4543 40HNMA and BS 970 (Part 1) 817M40 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.