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JIS G4105 SCM420 vs IS 1570 (Part 4) 30Cr4Mo2

Close Alternative — 81.4% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM420 (JIS G4105:1979) and IS 1570 (Part 4) 30Cr4Mo2 (IS 1570 (Part 4):1988) are both steel grades. Both fall under the Alloy Steel category. JIS G4105 SCM420 is defined under Japanese Industrial Standards (JIS), originating from Japan, while IS 1570 (Part 4) 30Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, JIS G4105 SCM420 vs IS 1570 (Part 4) 30Cr4Mo2 is a 81.4% 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 81.4%.

Frequently Compared With JIS G4105 SCM420:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
81.4%
MECHANICAL MATCH
No shared data
OVERALL
81.4%
Specifications
Property JIS G4105 SCM420 IS 1570 (Part 4) 30Cr4Mo2
Standard JIS G4105:1979 IS 1570 (Part 4):1988
Category Alloy Steel Alloy Steel
C (%) 0.18–0.23 0.28-0.33
Si (%) 0.15–0.35 0.10-0.35
Mn (%) 0.60–0.90 0.40-0.80
Cr (%) 0.90–1.20 0.80-1.10
Mo (%) 0.15–0.30 0.15-0.28
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 SCM420 IS 1570 (Part 4) 30Cr4Mo2
Tensile Strength ≥830 MPa Not specified
Case Hardness HRC 58–62 Not specified
Core Hardness HB 235–293 Not specified
Typical Applications
JIS G4105 SCM420
Case hardened gears, cams, pins, shafts
IS 1570 (Part 4) 30Cr4Mo2
Not documented
Can JIS G4105 SCM420 Be Substituted With IS 1570 (Part 4) 30Cr4Mo2?
JIS G4105 SCM420 and IS 1570 (Part 4) 30Cr4Mo2 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 G4105 SCM420
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4800–6400 mm (188.98–251.97 in)
IS 1570 (Part 4) 30Cr4Mo2
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On M-EX Right Now
JIS G4105 SCM420
3 active listings and RFQs →
IS 1570 (Part 4) 30Cr4Mo2
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Frequently Asked Questions
What is the difference between JIS G4105 SCM420 and IS 1570 (Part 4) 30Cr4Mo2?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4105 SCM420 be substituted with IS 1570 (Part 4) 30Cr4Mo2?
JIS G4105 SCM420 and IS 1570 (Part 4) 30Cr4Mo2 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.