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JIS G4105 SCM440 vs JIS G4202 SACM645

Strong Match — 85.9% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM440 (JIS G4105:1979) and JIS G4202 SACM645 (JIS G 4202:2005) are both steel grades. Both fall under the Alloy Steel category. JIS G4105 SCM440 is typically used for automotive parts, gears, shafts, bolts, dies, while JIS G4202 SACM645 is commonly used for nitrided gears, crankshafts, cylinder liners, gauges. JIS G4105 SCM440 is defined under Japanese Industrial Standards (JIS), originating from Japan, while JIS G4202 SACM645 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, JIS G4105 SCM440 vs JIS G4202 SACM645 is a 78.9% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 85.9%.

Frequently Compared With JIS G4105 SCM440:
GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A UNI 11234 100Cr6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
78.9%
MECHANICAL MATCH
100%
OVERALL
85.9%
Specifications
Property JIS G4105 SCM440 JIS G4202 SACM645
Standard JIS G4105:1979 JIS G 4202:2005
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.40–0.50
Si (%) 0.15–0.35 0.15–0.50
Mn (%) 0.60–0.90 0.55–0.90
Cr (%) 0.90–1.20 1.30–1.70
Mo (%) 0.15–0.30 0.15–0.30
S (%) ≤0.030 ≤0.030
P (%) ≤0.030 ≤0.030
Al (%) Not specified 0.70–1.20
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4105 SCM440 JIS G4202 SACM645
Tensile Strength ≥930 MPa 930–1080 MPa
Yield Strength ≥785 MPa Not specified
Elongation ≥12% Not specified
Hardness 269–331 HB Not specified
Surface Hardness HV Not specified ≥900 (nitrided)
Core Hardness HB Not specified 269–321
Typical Applications
JIS G4105 SCM440
Automotive parts, gears, shafts, bolts, dies
JIS G4202 SACM645
Nitrided gears, crankshafts, cylinder liners, gauges
Key Differences
Can JIS G4105 SCM440 Be Substituted With JIS G4202 SACM645?
JIS G4105 SCM440 and JIS G4202 SACM645 overlap closely enough on chemistry and mechanical properties that JIS G4202 SACM645 is often considered as a substitute for JIS G4105 SCM440 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
JIS G4105 SCM440
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5400–7000 mm (212.6–275.59 in)
JIS G4202 SACM645
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–5900 mm (181.1–232.28 in)
On M-EX Right Now
JIS G4105 SCM440
3 active listings and RFQs →
JIS G4202 SACM645
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4105 SCM440 and JIS G4202 SACM645?
JIS G4202 SACM645 specifies Al which is not specified for JIS G4105 SCM440.
Can JIS G4105 SCM440 be substituted with JIS G4202 SACM645?
JIS G4105 SCM440 and JIS G4202 SACM645 overlap closely enough on chemistry and mechanical properties that JIS G4202 SACM645 is often considered as a substitute for JIS G4105 SCM440 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.