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JIS G4103 SNCM439 vs GOST 4543 12HN3A

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

JIS G4103 SNCM439 (JIS G4103:1979) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. JIS G4103 SNCM439 is typically used for crankshafts, gears, heavy duty shafts, aircraft components, while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. JIS G4103 SNCM439 is defined under Japanese Industrial Standards (JIS) (Japan).

As per chemical composition, JIS G4103 SNCM439 vs GOST 4543 12HN3A is a 65.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4103 SNCM439:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
65.4%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property JIS G4103 SNCM439 GOST 4543 12HN3A
Standard JIS G4103:1979 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.36–0.43 0.09-0.16
Si (%) 0.15–0.35 0.17-0.37
Mn (%) 0.60–0.90 0.3-0.6
Cr (%) 0.60–1.00 0.6-0.9
Mo (%) 0.15–0.30 Not specified
Ni (%) 1.60–2.00 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 JIS G4103 SNCM439 GOST 4543 12HN3A
Tensile Strength ≥980 MPa 850-1050 MPa
Yield Strength ≥835 MPa 685 MPa min
Elongation ≥12% 11% min
Hardness 293–352 HB 58-62 HRC (case)
Typical Applications
JIS G4103 SNCM439
Crankshafts, gears, heavy duty shafts, aircraft components
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can JIS G4103 SNCM439 Be Substituted With GOST 4543 12HN3A?
JIS G4103 SNCM439 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
JIS G4103 SNCM439
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4900–5800 mm (192.91–228.35 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
JIS G4103 SNCM439
3 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4103 SNCM439 and GOST 4543 12HN3A?
JIS G4103 SNCM439 specifies Mo which is not specified for GOST 4543 12HN3A.
Can JIS G4103 SNCM439 be substituted with GOST 4543 12HN3A?
JIS G4103 SNCM439 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.