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BS 970 (Part 1) 708H20 vs JIS G4105 SCM420

Strong Match — 86.1% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 708H20 (BS 970 (Part 1):1983) and JIS G4105 SCM420 (JIS G4105:1979) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 708H20 is typically used for case hardening steel supplied to specified hardenability limits (end quench test, table 10)., while JIS G4105 SCM420 is commonly used for case hardened gears, cams, pins, shafts. BS 970 (Part 1) 708H20 is defined under British Standards (BS), originating from United Kingdom, while JIS G4105 SCM420 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, BS 970 (Part 1) 708H20 vs JIS G4105 SCM420 is a 86.1% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 86.1%.

Frequently Compared With BS 970 (Part 1) 708H20:
IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Mo6H NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
86.1%
MECHANICAL MATCH
No shared data
OVERALL
86.1%
Specifications
Property BS 970 (Part 1) 708H20 JIS G4105 SCM420
Standard BS 970 (Part 1):1983 JIS G4105:1979
Category Alloy Steel Alloy Steel
C (%) 0.17-0.23 0.18–0.23
Mn (%) 0.60-0.90 0.60–0.90
Cr (%) 0.85-1.15 0.90–1.20
Mo (%) 0.15-0.25 0.15–0.30
P (%) <=0.035 Not specified
S (%) <=0.040 Not specified
Si (%) Not specified 0.15–0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 (Part 1) 708H20 JIS G4105 SCM420
Tensile Strength Not specified ≥830 MPa
Case Hardness HRC Not specified 58–62
Core Hardness HB Not specified 235–293
Typical Applications
BS 970 (Part 1) 708H20
Case hardening steel supplied to specified hardenability limits (end quench test, Table 10).
JIS G4105 SCM420
Case hardened gears, cams, pins, shafts
Key Differences
Can BS 970 (Part 1) 708H20 Be Substituted With JIS G4105 SCM420?
BS 970 (Part 1) 708H20 and JIS G4105 SCM420 overlap closely enough on chemistry and mechanical properties that JIS G4105 SCM420 is often considered as a substitute for BS 970 (Part 1) 708H20 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
BS 970 (Part 1) 708H20
No active listings currently.
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)
On M-EX Right Now
BS 970 (Part 1) 708H20
0 active listings and RFQs →
JIS G4105 SCM420
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 708H20 and JIS G4105 SCM420?
BS 970 (Part 1) 708H20 specifies P, S which are not specified for JIS G4105 SCM420. JIS G4105 SCM420 specifies Si which is not specified for BS 970 (Part 1) 708H20.
Can BS 970 (Part 1) 708H20 be substituted with JIS G4105 SCM420?
BS 970 (Part 1) 708H20 and JIS G4105 SCM420 overlap closely enough on chemistry and mechanical properties that JIS G4105 SCM420 is often considered as a substitute for BS 970 (Part 1) 708H20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.