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BS 970 (Part 3) 637M17 vs GOST 4543 12HN3A

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

BS 970 (Part 3) 637M17 (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) 637M17 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15), while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. BS 970 (Part 3) 637M17 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, BS 970 (Part 3) 637M17 vs GOST 4543 12HN3A is a 74.1% 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 BS 970 (Part 3) 637M17:
EN 10084 10NiCr5-4 IS 11169 (Part 1) 10Ni5Cr4 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 GB/T 3077 12CrNi2 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
74.1%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property BS 970 (Part 3) 637M17 GOST 4543 12HN3A
Standard BS 970 (Part 3):1991 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.14-0.20 0.09-0.16
Si (%) 0.10-0.40 0.17-0.37
Mn (%) 0.60-0.90 0.3-0.6
Cr (%) 0.60-1.00 0.6-0.9
Ni (%) 0.85-1.25 2.75-3.15
P (%) <=0.04 Not specified
S (%) <=0.05 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 BS 970 (Part 3) 637M17 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) 637M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can BS 970 (Part 3) 637M17 Be Substituted With GOST 4543 12HN3A?
BS 970 (Part 3) 637M17 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) 637M17
No active listings currently.
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) 637M17
0 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 3) 637M17 and GOST 4543 12HN3A?
BS 970 (Part 3) 637M17 specifies P, S which are not specified for GOST 4543 12HN3A.
Can BS 970 (Part 3) 637M17 be substituted with GOST 4543 12HN3A?
BS 970 (Part 3) 637M17 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.