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GB/T 3077 12CrMo vs SAE J404 4118

Close Alternative — 70.2% match based on chemical composition and mechanical property overlap.

GB/T 3077 12CrMo (GB/T 3077:2015) and SAE J404 4118 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 12CrMo is typically used for hot-rolled or forged structural alloy steel bars, while SAE J404 4118 is commonly used for gears, camshafts, pins and lightly stressed automotive components. GB/T 3077 12CrMo is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 4118 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 3077 12CrMo vs SAE J404 4118 is a 70.2% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 70.2%.

Frequently Compared With GB/T 3077 12CrMo:
UNI 11234 100Cr6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
70.2%
MECHANICAL MATCH
No shared data
OVERALL
70.2%
Specifications
Property GB/T 3077 12CrMo SAE J404 4118
Standard GB/T 3077:2015 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.08-0.15 0.18-0.23
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 0.40-0.70 0.70-0.90
Cr (%) 0.40-0.70 0.40-0.60
Mo (%) 0.40-0.55 0.08-0.15
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.040
Cu (%) <=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 GB/T 3077 12CrMo SAE J404 4118
Tensile Strength >=410 MPa Not specified
Yield Strength >=265 MPa Not specified
Elongation >=24% Not specified
Hardness <=179 HB Not specified
Condition Quenched and tempered, test sample 30 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 12CrMo
Hot-rolled or forged structural alloy steel bars
SAE J404 4118
Gears, camshafts, pins and lightly stressed automotive components
Key Differences
Can GB/T 3077 12CrMo Be Substituted With SAE J404 4118?
GB/T 3077 12CrMo and SAE J404 4118 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GB/T 3077 12CrMo
No active listings currently.
SAE J404 4118
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5400–6200 mm (212.6–244.09 in)
On M-EX Right Now
GB/T 3077 12CrMo
0 active listings and RFQs →
SAE J404 4118
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 12CrMo and SAE J404 4118?
GB/T 3077 12CrMo specifies Cu which is not specified for SAE J404 4118.
Can GB/T 3077 12CrMo be substituted with SAE J404 4118?
GB/T 3077 12CrMo and SAE J404 4118 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.