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SAE J404 4120 vs GB/T 3077 12Cr2Ni4A

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

SAE J404 4120 (SAE J404:2009) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. SAE J404 4120 is typically used for used for gears, crankshafts, studs, pins, machinery parts, and transmission components., while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. SAE J404 4120 is defined under SAE International, originating from United States, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, SAE J404 4120 vs GB/T 3077 12Cr2Ni4A is a 57.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With SAE J404 4120:
UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 103Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 12Cr2Mo5V2H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 GB/T 3077 12CrMoV
Match Breakdown
CHEMISTRY MATCH
57.4%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property SAE J404 4120 GB/T 3077 12Cr2Ni4A
Standard SAE J404:2009 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.18-0.23 0.10-0.15
Cr (%) 0.40-0.60 1.25-1.65
Mn (%) 0.90-1.20 0.30-0.60
Mo (%) 0.13-0.20 Not specified
P (%) <=0.030 0.025 max
S (%) <=0.040 0.025 max
Si (%) 0.15-0.35 0.17-0.37
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 SAE J404 4120 GB/T 3077 12Cr2Ni4A
Tensile Strength Not specified 980-1180 MPa
Yield Strength Not specified 785-980 MPa
Elongation Not specified 10-14%
Hardness Not specified 58-62 HRC (case)
Typical Applications
SAE J404 4120
Used for gears, crankshafts, studs, pins, machinery parts, and transmission components.
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can SAE J404 4120 Be Substituted With GB/T 3077 12Cr2Ni4A?
SAE J404 4120 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
SAE J404 4120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5800–6100 mm (228.35–240.16 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
SAE J404 4120
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 4120 and GB/T 3077 12Cr2Ni4A?
SAE J404 4120 specifies Mo which is not specified for GB/T 3077 12Cr2Ni4A. GB/T 3077 12Cr2Ni4A specifies Ni which is not specified for SAE J404 4120.
Can SAE J404 4120 be substituted with GB/T 3077 12Cr2Ni4A?
SAE J404 4120 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.