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JIS G4105 SCM420 vs GB/T 3077 12Cr2Ni4A

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

JIS G4105 SCM420 (JIS G4105:1979) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. JIS G4105 SCM420 is typically used for case hardened gears, cams, pins, shafts, while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. JIS G4105 SCM420 is defined under Japanese Industrial Standards (JIS), originating from Japan, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, JIS G4105 SCM420 vs GB/T 3077 12Cr2Ni4A is a 56.1% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4105 SCM420:
NF A35-565 100C6 UNI 11234 100Cr6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
56.1%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property JIS G4105 SCM420 GB/T 3077 12Cr2Ni4A
Standard JIS G4105:1979 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.18–0.23 0.10-0.15
Si (%) 0.15–0.35 0.17-0.37
Mn (%) 0.60–0.90 0.30-0.60
Cr (%) 0.90–1.20 1.25-1.65
Mo (%) 0.15–0.30 Not specified
Ni (%) Not specified 3.25-3.75
P (%) Not specified 0.025 max
S (%) Not specified 0.025 max
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4105 SCM420 GB/T 3077 12Cr2Ni4A
Tensile Strength ≥830 MPa 980-1180 MPa
Case Hardness HRC 58–62 Not specified
Core Hardness HB 235–293 Not specified
Yield Strength Not specified 785-980 MPa
Elongation Not specified 10-14%
Hardness Not specified 58-62 HRC (case)
Typical Applications
JIS G4105 SCM420
Case hardened gears, cams, pins, shafts
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can JIS G4105 SCM420 Be Substituted With GB/T 3077 12Cr2Ni4A?
JIS G4105 SCM420 and GB/T 3077 12Cr2Ni4A 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 G4105 SCM420
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4800–6400 mm (188.98–251.97 in)
GB/T 3077 12Cr2Ni4A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6600 mm (196.85–259.84 in)
On M-EX Right Now
JIS G4105 SCM420
3 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4105 SCM420 and GB/T 3077 12Cr2Ni4A?
JIS G4105 SCM420 specifies Mo which is not specified for GB/T 3077 12Cr2Ni4A. GB/T 3077 12Cr2Ni4A specifies Ni, P, S which are not specified for JIS G4105 SCM420.
Can JIS G4105 SCM420 be substituted with GB/T 3077 12Cr2Ni4A?
JIS G4105 SCM420 and GB/T 3077 12Cr2Ni4A 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.