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KS D3867 SCM440 vs BS 970 (Part 1) 708A40

Strong Match — 86% match based on chemical composition and mechanical property overlap.

KS D3867 SCM440 (KS D 3867:2025) and BS 970 (Part 1) 708A40 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. KS D3867 SCM440 is typically used for shafts,gears,axles,bolts,automotive parts,machine components,spindles,hydraulic parts, 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.. KS D3867 SCM440 is defined under Korean Industrial Standards (KS), originating from South Korea, while BS 970 (Part 1) 708A40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, KS D3867 SCM440 vs BS 970 (Part 1) 708A40 is a 86% 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%.

Frequently Compared With KS D3867 SCM440:
NF A35-565 100C6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 103Cr4 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
86%
MECHANICAL MATCH
No shared data
OVERALL
86%
Specifications
Property KS D3867 SCM440 BS 970 (Part 1) 708A40
Standard KS D 3867:2025 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 (%) 0.60-0.85 0.75-1.00
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.040
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 0.15-0.25
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property KS D3867 SCM440 BS 970 (Part 1) 708A40
Tensile Strength 900-1100 MPa Not specified
Yield Strength 700-900 MPa Not specified
Elongation 11-16 % Not specified
Hardness 248-320 HB Not specified
Typical Applications
KS D3867 SCM440
shafts,gears,axles,bolts,automotive parts,machine components,spindles,hydraulic parts
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 KS D3867 SCM440 Be Substituted With BS 970 (Part 1) 708A40?
KS D3867 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 KS D3867 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
KS D3867 SCM440
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6000–6500 mm (236.22–255.91 in)
BS 970 (Part 1) 708A40
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On M-EX Right Now
KS D3867 SCM440
2 active listings and RFQs →
BS 970 (Part 1) 708A40
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Frequently Asked Questions
What is the difference between KS D3867 SCM440 and BS 970 (Part 1) 708A40?
KS D3867 SCM440 specifies Si which is not specified for BS 970 (Part 1) 708A40.
Can KS D3867 SCM440 be substituted with BS 970 (Part 1) 708A40?
KS D3867 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 KS D3867 SCM440 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.