Post Stock Login Register

GB/T 3077 40CrNiMo vs JIS G4103 SNCM439

Close Alternative — 75.9% match based on chemical composition and mechanical property overlap.

GB/T 3077 40CrNiMo (GB/T 3077:2015) and JIS G4103 SNCM439 (JIS G4103:1979) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40CrNiMo is typically used for hot-rolled or forged structural alloy steel bars, while JIS G4103 SNCM439 is commonly used for crankshafts, gears, heavy duty shafts, aircraft components. GB/T 3077 40CrNiMo is defined under Guobiao Standards (GB/T), originating from China, while JIS G4103 SNCM439 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, GB/T 3077 40CrNiMo vs JIS G4103 SNCM439 is a 76.3% match. As per mechanical properties, the match is 75%. Combined, this makes them a close alternative overall at 75.9%.

Frequently Compared With GB/T 3077 40CrNiMo:
IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
76.3%
MECHANICAL MATCH
75%
OVERALL
75.9%
Specifications
Property GB/T 3077 40CrNiMo JIS G4103 SNCM439
Standard GB/T 3077:2015 JIS G4103:1979
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.36–0.43
Si (%) 0.17-0.37 0.15–0.35
Mn (%) 0.50-0.80 0.60–0.90
Cr (%) 0.60-0.90 0.60–1.00
Mo (%) 0.15-0.25 0.15–0.30
Ni (%) 1.25-1.65 1.60–2.00
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
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 40CrNiMo JIS G4103 SNCM439
Tensile Strength >=980 MPa ≥980 MPa
Yield Strength >=835 MPa ≥835 MPa
Elongation >=12% ≥12%
Hardness <=269 HB 293–352 HB
Condition Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 40CrNiMo
Hot-rolled or forged structural alloy steel bars
JIS G4103 SNCM439
Crankshafts, gears, heavy duty shafts, aircraft components
Key Differences
Can GB/T 3077 40CrNiMo Be Substituted With JIS G4103 SNCM439?
GB/T 3077 40CrNiMo and JIS G4103 SNCM439 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 40CrNiMo
No active listings currently.
JIS G4103 SNCM439
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4900–5800 mm (192.91–228.35 in)
On M-EX Right Now
GB/T 3077 40CrNiMo
0 active listings and RFQs →
JIS G4103 SNCM439
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 40CrNiMo and JIS G4103 SNCM439?
GB/T 3077 40CrNiMo specifies P, S, Cu which are not specified for JIS G4103 SNCM439.
Can GB/T 3077 40CrNiMo be substituted with JIS G4103 SNCM439?
GB/T 3077 40CrNiMo and JIS G4103 SNCM439 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.