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GOST 4543 12HN3A vs BS 970 (Part 1) 635H15

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

GOST 4543 12HN3A (GOST 4543-2016) and BS 970 (Part 1) 635H15 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 12HN3A is typically used for used for gears, pinions, crankshafts, aircraft parts, and transmission components., while BS 970 (Part 1) 635H15 is commonly used for case hardening steel (section four). BS 970 (Part 1) 635H15 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 12HN3A vs BS 970 (Part 1) 635H15 is a 70.1% 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 12HN3A:
GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 NF A35-565 100C6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 7) 10Cr36Mo10H GB/T 3077 12CrNi3
Match Breakdown
CHEMISTRY MATCH
70.1%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property GOST 4543 12HN3A BS 970 (Part 1) 635H15
Standard GOST 4543-2016 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.09-0.16 0.12-0.18
Cr (%) 0.6-0.9 0.40-0.80
Ni (%) 2.75-3.15 0.70-1.10
Mn (%) 0.3-0.6 0.60-0.90
Si (%) 0.17-0.37 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 12HN3A BS 970 (Part 1) 635H15
Tensile Strength 850-1050 MPa Not specified
Yield Strength 685 MPa min Not specified
Elongation 11% min Not specified
Hardness 58-62 HRC (case) Not specified
Typical Applications
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
BS 970 (Part 1) 635H15
Case hardening steel (section four)
Key Differences
Can GOST 4543 12HN3A Be Substituted With BS 970 (Part 1) 635H15?
GOST 4543 12HN3A and BS 970 (Part 1) 635H15 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 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
BS 970 (Part 1) 635H15
No active listings currently.
On M-EX Right Now
GOST 4543 12HN3A
2 active listings and RFQs →
BS 970 (Part 1) 635H15
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 12HN3A and BS 970 (Part 1) 635H15?
GOST 4543 12HN3A specifies Si which is not specified for BS 970 (Part 1) 635H15.
Can GOST 4543 12HN3A be substituted with BS 970 (Part 1) 635H15?
GOST 4543 12HN3A and BS 970 (Part 1) 635H15 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.