Close Alternative — 81.6% match
based on chemical composition and mechanical property overlap.
GB/T 3077 20CrMo (GB/T 3077:2015) and SAE J404 4135 (SAE J404:2009) are both steel grades.
Both fall under the Alloy Steel category.
GB/T 3077 20CrMo is typically used for used for gears, shafts, axles, transmission parts, fasteners, and machine components., while SAE J404 4135 is commonly used for gears, shafts, pressure vessels, high tensile bolts.
GB/T 3077 20CrMo is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 4135 is defined under SAE International, originating from United States.
As per chemical composition, GB/T 3077 20CrMo vs SAE J404 4135 is a 81.6% 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 81.6%.
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 20CrMo
SAE J404 4135
Tensile Strength
>=885 MPa
Not specified
Yield Strength
>=685 MPa
Not specified
Elongation
>=12%
Not specified
Hardness
<=197 HB
Not specified
Condition
Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered
Not specified
Typical Applications
GB/T 3077 20CrMo
Used for gears, shafts, axles, transmission parts, fasteners, and machine components.
SAE J404 4135
Gears, shafts, pressure vessels, high tensile bolts
Key Differences
GB/T 3077 20CrMo specifies Cu which is not specified for SAE J404 4135.
Can GB/T 3077 20CrMo Be Substituted With SAE J404 4135?
GB/T 3077 20CrMo and SAE J404 4135 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.
What is the difference between GB/T 3077 20CrMo and SAE J404 4135?
GB/T 3077 20CrMo specifies Cu which is not specified for SAE J404 4135.
Can GB/T 3077 20CrMo be substituted with SAE J404 4135?
GB/T 3077 20CrMo and SAE J404 4135 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.