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JIS G4105 SCM430 vs BS 970 (Part 3) 708M40

Close Alternative — 82.4% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM430 (JIS G4105:1979) and BS 970 (Part 3) 708M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. JIS G4105 SCM430 is typically used for high tensile bolts, pressure vessels, aircraft parts, while BS 970 (Part 3) 708M40 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (table 16). JIS G4105 SCM430 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 3) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4105 SCM430 vs BS 970 (Part 3) 708M40 is a 82.4% 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 82.4%.

Frequently Compared With JIS G4105 SCM430:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
82.4%
MECHANICAL MATCH
No shared data
OVERALL
82.4%
Specifications
Property JIS G4105 SCM430 BS 970 (Part 3) 708M40
Standard JIS G4105:1979 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.28–0.33 0.36-0.44
Si (%) 0.15–0.35 0.10-0.40
Mn (%) 0.60–0.90 0.70-1.00
Cr (%) 0.90–1.20 0.90-1.20
Mo (%) 0.15–0.30 0.15-0.25
P (%) Not specified <=0.035
S (%) Not specified <=0.040
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 SCM430 BS 970 (Part 3) 708M40
Tensile Strength ≥780 MPa Not specified
Yield Strength ≥635 MPa Not specified
Elongation ≥15% Not specified
Hardness 229–293 HB Not specified
Typical Applications
JIS G4105 SCM430
High tensile bolts, pressure vessels, aircraft parts
BS 970 (Part 3) 708M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Key Differences
Can JIS G4105 SCM430 Be Substituted With BS 970 (Part 3) 708M40?
JIS G4105 SCM430 and BS 970 (Part 3) 708M40 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 SCM430
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5400–5500 mm (212.6–216.54 in)
BS 970 (Part 3) 708M40
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On M-EX Right Now
JIS G4105 SCM430
2 active listings and RFQs →
BS 970 (Part 3) 708M40
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Frequently Asked Questions
What is the difference between JIS G4105 SCM430 and BS 970 (Part 3) 708M40?
BS 970 (Part 3) 708M40 specifies P, S which are not specified for JIS G4105 SCM430.
Can JIS G4105 SCM430 be substituted with BS 970 (Part 3) 708M40?
JIS G4105 SCM430 and BS 970 (Part 3) 708M40 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.