Post Stock Login Register

JIS G4202 SACM645 vs JIS G4105 SCM440

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

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

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