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KS D3867 SCM435 vs BS 970 (Part 3) 709M40

Close Alternative — 80% match based on chemical composition and mechanical property overlap.

KS D3867 SCM435 (KS D 3867:2025) and BS 970 (Part 3) 709M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. KS D3867 SCM435 is typically used for shafts,bolts,studs,axles,gears,structural components,fasteners,machine parts, 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). KS D3867 SCM435 is defined under Korean Industrial Standards (KS), originating from South Korea, while BS 970 (Part 3) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, KS D3867 SCM435 vs BS 970 (Part 3) 709M40 is a 80% 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 80%.

Frequently Compared With KS D3867 SCM435:
NF A35-565 100C6 GOST 4543 12HN3A UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 GB/T 3077 12Cr2Ni4A IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
No shared data
OVERALL
80%
Specifications
Property KS D3867 SCM435 BS 970 (Part 3) 709M40
Standard KS D 3867:2025 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.33-0.38 0.36-0.44
Si (%) 0.15-0.35 0.10-0.40
Mn (%) 0.60-0.85 0.70-1.00
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.040
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 0.25-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property KS D3867 SCM435 BS 970 (Part 3) 709M40
Tensile Strength 930-1080 MPa Not specified
Yield Strength 785 MPa min Not specified
Elongation 12-15 % Not specified
Hardness 269-321 HB Not specified
Typical Applications
KS D3867 SCM435
shafts,bolts,studs,axles,gears,structural components,fasteners,machine parts
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 KS D3867 SCM435 Be Substituted With BS 970 (Part 3) 709M40?
KS D3867 SCM435 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
KS D3867 SCM435
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5400–6000 mm (212.6–236.22 in)
BS 970 (Part 3) 709M40
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On M-EX Right Now
KS D3867 SCM435
2 active listings and RFQs →
BS 970 (Part 3) 709M40
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Frequently Asked Questions
What is the difference between KS D3867 SCM435 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 KS D3867 SCM435 be substituted with BS 970 (Part 3) 709M40?
KS D3867 SCM435 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.