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BS 970 (Part 3) 817M40 vs GOST 4543 12HN3A

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 817M40 is typically used for high tensile shafts, gears, crankshafts, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. BS 970 (Part 3) 817M40 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, BS 970 (Part 3) 817M40 vs GOST 4543 12HN3A is a 58.8% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 (Part 3) 817M40:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
58.8%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property BS 970 (Part 3) 817M40 GOST 4543 12HN3A
Standard BS 970 (Part 3):1991 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.09-0.16
Si (%) 0.10-0.40 0.17-0.37
Mn (%) 0.45-0.70 0.3-0.6
P (%) <=0.035 Not specified
S (%) <=0.040 Not specified
Cr (%) 1.00-1.40 0.6-0.9
Mo (%) 0.20-0.35 Not specified
Ni (%) 1.30-1.70 2.75-3.15
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 (Part 3) 817M40 GOST 4543 12HN3A
Tensile Strength Not specified 850-1050 MPa
Yield Strength Not specified 685 MPa min
Elongation Not specified 11% min
Hardness Not specified 58-62 HRC (case)
Typical Applications
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can BS 970 (Part 3) 817M40 Be Substituted With GOST 4543 12HN3A?
BS 970 (Part 3) 817M40 and GOST 4543 12HN3A 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 970 (Part 3) 817M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6500 mm (244.09–255.91 in)
GOST 4543 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
On M-EX Right Now
BS 970 (Part 3) 817M40
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 3) 817M40 and GOST 4543 12HN3A?
BS 970 (Part 3) 817M40 specifies P, S, Mo which are not specified for GOST 4543 12HN3A.
Can BS 970 (Part 3) 817M40 be substituted with GOST 4543 12HN3A?
BS 970 (Part 3) 817M40 and GOST 4543 12HN3A 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.