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JIS G4103 SNCM439 vs JIS G4053 SNCM240

Close Alternative — 76% match based on chemical composition and mechanical property overlap.

JIS G4103 SNCM439 (JIS G4103:1979) and JIS G4053 SNCM240 (JIS G4053:2008) are both steel grades. Both fall under the Alloy Steel category. JIS G4103 SNCM439 is typically used for crankshafts, gears, heavy duty shafts, aircraft components, while JIS G4053 SNCM240 is commonly used for nickel-chromium-molybdenum case-hardening (carburizing) steel, higher carbon variant than sncm220; gears, shafts, and highly stressed transmission components requiring wear-resistant carburized surface and tough core. JIS G4103 SNCM439 is defined under Japanese Industrial Standards (JIS), originating from Japan, while JIS G4053 SNCM240 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, JIS G4103 SNCM439 vs JIS G4053 SNCM240 is a 89.1% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 76%.

Frequently Compared With JIS G4103 SNCM439:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
89.1%
MECHANICAL MATCH
50%
OVERALL
76%
Specifications
Property JIS G4103 SNCM439 JIS G4053 SNCM240
Standard JIS G4103:1979 JIS G4053:2008
Category Alloy Steel Alloy Steel
C (%) 0.36–0.43 0.37-0.43
Si (%) 0.15–0.35 0.15-0.35
Mn (%) 0.60–0.90 0.60-0.90
Cr (%) 0.60–1.00 0.40-0.80
Mo (%) 0.15–0.30 0.15-0.30
Ni (%) 1.60–2.00 1.50-2.00
P (%) Not specified <=0.030
S (%) Not specified <=0.030
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4103 SNCM439 JIS G4053 SNCM240
Tensile Strength ≥980 MPa 980 MPa min
Yield Strength ≥835 MPa 835 MPa min
Elongation ≥12% 10% min
Hardness 293–352 HB 285-352 HB
Typical Applications
JIS G4103 SNCM439
Crankshafts, gears, heavy duty shafts, aircraft components
JIS G4053 SNCM240
Nickel-chromium-molybdenum case-hardening (carburizing) steel, higher carbon variant than SNCM220; gears, shafts, and highly stressed transmission components requiring wear-resistant carburized surface and tough core
Key Differences
Can JIS G4103 SNCM439 Be Substituted With JIS G4053 SNCM240?
JIS G4103 SNCM439 and JIS G4053 SNCM240 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
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)
JIS G4053 SNCM240
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6300–6300 mm (248.03–248.03 in)
On M-EX Right Now
JIS G4103 SNCM439
3 active listings and RFQs →
JIS G4053 SNCM240
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4103 SNCM439 and JIS G4053 SNCM240?
JIS G4053 SNCM240 specifies P, S which are not specified for JIS G4103 SNCM439.
Can JIS G4103 SNCM439 be substituted with JIS G4053 SNCM240?
JIS G4103 SNCM439 and JIS G4053 SNCM240 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.