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JIS G4105 SCM440 vs BS 970 (Part 3) 709M40

Close Alternative — 84.2% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM440 (JIS G4105:1979) and BS 970 (Part 3) 709M40 (BS 970 (Part 3):1991) 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 BS 970 (Part 3) 709M40 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 SCM440 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 3) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4105 SCM440 vs BS 970 (Part 3) 709M40 is a 84.2% 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 84.2%.

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
84.2%
MECHANICAL MATCH
No shared data
OVERALL
84.2%
Specifications
Property JIS G4105 SCM440 BS 970 (Part 3) 709M40
Standard JIS G4105:1979 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 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 0.25-0.35
S (%) ≤0.030 <=0.040
P (%) ≤0.030 <=0.035
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 BS 970 (Part 3) 709M40
Tensile Strength ≥930 MPa Not specified
Yield Strength ≥785 MPa Not specified
Elongation ≥12% Not specified
Hardness 269–331 HB Not specified
Typical Applications
JIS G4105 SCM440
Automotive parts, gears, shafts, bolts, dies
BS 970 (Part 3) 709M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Can JIS G4105 SCM440 Be Substituted With BS 970 (Part 3) 709M40?
JIS G4105 SCM440 and BS 970 (Part 3) 709M40 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 SCM440
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5400–7000 mm (212.6–275.59 in)
BS 970 (Part 3) 709M40
No active listings currently.
On M-EX Right Now
JIS G4105 SCM440
3 active listings and RFQs →
BS 970 (Part 3) 709M40
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Frequently Asked Questions
What is the difference between JIS G4105 SCM440 and BS 970 (Part 3) 709M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4105 SCM440 be substituted with BS 970 (Part 3) 709M40?
JIS G4105 SCM440 and BS 970 (Part 3) 709M40 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.