Post Stock Login Register

BS 970 (Part 1) 655M13 vs GOST 4543 12HN3A

Minimal Match — 53.7% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 655M13 (BS 970 (Part 1):1991) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 655M13 is typically used for case hardened gears, heavily loaded shafts, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. BS 970 (Part 1) 655M13 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, BS 970 (Part 1) 655M13 vs GOST 4543 12HN3A is a 80.5% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 53.7%.

Frequently Compared With BS 970 (Part 1) 655M13:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
80.5%
MECHANICAL MATCH
0%
OVERALL
53.7%
Specifications
Property BS 970 (Part 1) 655M13 GOST 4543 12HN3A
Standard BS 970 (Part 1):1991 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.10-0.16 0.09-0.16
Mn (%) 0.35-0.60 0.3-0.6
Cr (%) 0.70-1.00 0.6-0.9
Ni (%) 3.00-3.75 2.75-3.15
Si (%) Not specified 0.17-0.37
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 1) 655M13 GOST 4543 12HN3A
Condition Case hardened, 19 mm test bar Not specified
Tensile Strength 1000 MPa min 850-1050 MPa
Elongation 9 % min 11% min
Yield Strength Not specified 685 MPa min
Hardness Not specified 58-62 HRC (case)
Typical Applications
BS 970 (Part 1) 655M13
Case hardened gears, heavily loaded shafts
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can BS 970 (Part 1) 655M13 Be Substituted With GOST 4543 12HN3A?
BS 970 (Part 1) 655M13 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 1) 655M13
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4200–6300 mm (165.35–248.03 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 1) 655M13
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 655M13 and GOST 4543 12HN3A?
GOST 4543 12HN3A specifies Si which is not specified for BS 970 (Part 1) 655M13.
Can BS 970 (Part 1) 655M13 be substituted with GOST 4543 12HN3A?
BS 970 (Part 1) 655M13 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.