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SAE J404 4120 vs GB/T 3077 12CrMoV

Related Material — 64.4% match based on chemical composition and mechanical property overlap.

SAE J404 4120 (SAE J404:2009) and GB/T 3077 12CrMoV (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 12CrMoV is commonly used for hot-rolled or forged structural alloy steel bars. SAE J404 4120 is defined under SAE International, originating from United States, while GB/T 3077 12CrMoV is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, SAE J404 4120 vs GB/T 3077 12CrMoV is a 64.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 64.4%.

Frequently Compared With SAE J404 4120:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A 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
Match Breakdown
CHEMISTRY MATCH
64.4%
MECHANICAL MATCH
No shared data
OVERALL
64.4%
Specifications
Property SAE J404 4120 GB/T 3077 12CrMoV
Standard SAE J404:2009 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.18-0.23 0.08-0.15
Cr (%) 0.40-0.60 0.30-0.60
Mn (%) 0.90-1.20 0.40-0.70
Mo (%) 0.13-0.20 0.25-0.35
P (%) <=0.030 <=0.030
S (%) <=0.040 <=0.030
Si (%) 0.15-0.35 0.17-0.37
V (%) Not specified 0.15-0.30
Cu (%) Not specified <=0.30
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 12CrMoV
Tensile Strength Not specified >=440 MPa
Yield Strength Not specified >=225 MPa
Elongation Not specified >=22%
Hardness Not specified <=241 HB
Condition Not specified Quenched and tempered, test sample 30 mm; hardness is for bars delivered annealed or high temperature tempered
Typical Applications
SAE J404 4120
Used for gears, crankshafts, studs, pins, machinery parts, and transmission components.
GB/T 3077 12CrMoV
Hot-rolled or forged structural alloy steel bars
Key Differences
Can SAE J404 4120 Be Substituted With GB/T 3077 12CrMoV?
SAE J404 4120 and GB/T 3077 12CrMoV 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 12CrMoV
No active listings currently.
On M-EX Right Now
SAE J404 4120
2 active listings and RFQs →
GB/T 3077 12CrMoV
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Frequently Asked Questions
What is the difference between SAE J404 4120 and GB/T 3077 12CrMoV?
GB/T 3077 12CrMoV specifies V, Cu which are not specified for SAE J404 4120.
Can SAE J404 4120 be substituted with GB/T 3077 12CrMoV?
SAE J404 4120 and GB/T 3077 12CrMoV 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.