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JIS G4202 SACM645 vs GB/T 3077 12Cr2Ni4A

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

JIS G4202 SACM645 (JIS G 4202:2005) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. JIS G4202 SACM645 is typically used for nitrided gears, crankshafts, cylinder liners, gauges, while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. JIS G4202 SACM645 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 G4202 SACM645 vs GB/T 3077 12Cr2Ni4A is a 59% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4202 SACM645:
NF A35-565 100C6 GOST 4543 12HN3A UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
59%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property JIS G4202 SACM645 GB/T 3077 12Cr2Ni4A
Standard JIS G 4202:2005 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.40–0.50 0.10-0.15
Si (%) 0.15–0.50 0.17-0.37
Mn (%) 0.55–0.90 0.30-0.60
Cr (%) 1.30–1.70 1.25-1.65
Mo (%) 0.15–0.30 Not specified
Al (%) 0.70–1.20 Not specified
P (%) ≤0.030 0.025 max
S (%) ≤0.030 0.025 max
Ni (%) Not specified 3.25-3.75
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4202 SACM645 GB/T 3077 12Cr2Ni4A
Tensile Strength 930–1080 MPa 980-1180 MPa
Surface Hardness HV ≥900 (nitrided) Not specified
Core Hardness HB 269–321 Not specified
Yield Strength Not specified 785-980 MPa
Elongation Not specified 10-14%
Hardness Not specified 58-62 HRC (case)
Typical Applications
JIS G4202 SACM645
Nitrided gears, crankshafts, cylinder liners, gauges
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can JIS G4202 SACM645 Be Substituted With GB/T 3077 12Cr2Ni4A?
JIS G4202 SACM645 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 G4202 SACM645
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–5900 mm (181.1–232.28 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 G4202 SACM645
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4202 SACM645 and GB/T 3077 12Cr2Ni4A?
JIS G4202 SACM645 specifies Mo, Al which are not specified for GB/T 3077 12Cr2Ni4A. GB/T 3077 12Cr2Ni4A specifies Ni which is not specified for JIS G4202 SACM645.
Can JIS G4202 SACM645 be substituted with GB/T 3077 12Cr2Ni4A?
JIS G4202 SACM645 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.