Post Stock Login Register

JIS G4105 SCM440 vs BS 970 (Part 1) 708A40

Strong Match — 86.4% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM440 (JIS G4105:1979) and BS 970 (Part 1) 708A40 (BS 970 (Part 1):1983) 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 1) 708A40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. JIS G4105 SCM440 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 708A40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4105 SCM440 vs BS 970 (Part 1) 708A40 is a 86.4% 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 86.4%.

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
86.4%
MECHANICAL MATCH
No shared data
OVERALL
86.4%
Specifications
Property JIS G4105 SCM440 BS 970 (Part 1) 708A40
Standard JIS G4105:1979 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.38-0.43
Si (%) 0.15–0.35 Not specified
Mn (%) 0.60–0.90 0.75-1.00
Cr (%) 0.90–1.20 0.90-1.20
Mo (%) 0.15–0.30 0.15-0.25
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 1) 708A40
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 1) 708A40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can JIS G4105 SCM440 Be Substituted With BS 970 (Part 1) 708A40?
JIS G4105 SCM440 and BS 970 (Part 1) 708A40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A40 is often considered as a substitute for JIS G4105 SCM440 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 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 1) 708A40
No active listings currently.
On M-EX Right Now
JIS G4105 SCM440
3 active listings and RFQs →
BS 970 (Part 1) 708A40
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4105 SCM440 and BS 970 (Part 1) 708A40?
JIS G4105 SCM440 specifies Si which is not specified for BS 970 (Part 1) 708A40.
Can JIS G4105 SCM440 be substituted with BS 970 (Part 1) 708A40?
JIS G4105 SCM440 and BS 970 (Part 1) 708A40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708A40 is often considered as a substitute for JIS G4105 SCM440 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.