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JIS G4103 SNCM420 vs GOST 4543 12HN3A

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

JIS G4103 SNCM420 (JIS G4103:1979) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. JIS G4103 SNCM420 is typically used for used in automotive gears, transmission parts, shafts, pinions, camshafts, and industrial equipment., while GOST 4543 12HN3A is commonly used for used for gears, pinions, crankshafts, aircraft parts, and transmission components.. JIS G4103 SNCM420 is defined under Japanese Industrial Standards (JIS) (Japan).

As per chemical composition, JIS G4103 SNCM420 vs GOST 4543 12HN3A is a 63% match. As per mechanical properties, the match is 7.4%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4103 SNCM420:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
63%
MECHANICAL MATCH
7.4%
OVERALL
35%
Specifications
Property JIS G4103 SNCM420 GOST 4543 12HN3A
Standard JIS G4103:1979 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) 0.17-0.23 0.09-0.16
Si (%) 0.15-0.35 0.17-0.37
Mn (%) 0.40-0.70 0.3-0.6
P (%) 0.030 max Not specified
S (%) 0.030 max Not specified
Ni (%) 1.50-2.00 2.75-3.15
Cr (%) 0.40-0.80 0.6-0.9
Mo (%) 0.15-0.30 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 JIS G4103 SNCM420 GOST 4543 12HN3A
Tensile Strength 780-930 MPa 850-1050 MPa
Yield Strength 590 MPa min 685 MPa min
Elongation 14% min 11% min
Hardness 217-269 HB 58-62 HRC (case)
Typical Applications
JIS G4103 SNCM420
Used in automotive gears, transmission parts, shafts, pinions, camshafts, and industrial equipment.
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can JIS G4103 SNCM420 Be Substituted With GOST 4543 12HN3A?
JIS G4103 SNCM420 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 SNCM420
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6000 mm (232.28–236.22 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 SNCM420
2 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4103 SNCM420 and GOST 4543 12HN3A?
JIS G4103 SNCM420 specifies P, S, Mo which are not specified for GOST 4543 12HN3A.
Can JIS G4103 SNCM420 be substituted with GOST 4543 12HN3A?
JIS G4103 SNCM420 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.