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ASTM A681 A4 vs KS D3867 SCM415

Related Material — 65% match based on chemical composition and mechanical property overlap.

ASTM A681 A4 (ASTM A681:2008) and KS D3867 SCM415 (KS D 3867:2025) are both steel grades. ASTM A681 A4 is classified under Tool & Die Steels, while KS D3867 SCM415 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A681 A4 is typically used for tools, dies and fixtures (clause 1.2), while KS D3867 SCM415 is commonly used for gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core.. ASTM A681 A4 is defined under ASTM International, originating from United States, while KS D3867 SCM415 is defined under Korean Industrial Standards (KS), originating from South Korea.

As per chemical composition, ASTM A681 A4 vs KS D3867 SCM415 is a 67.1% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With ASTM A681 A4:
GB/T 1299 3Cr2W8V DIN EN ISO 4957 1.2344 GB/T 1299 4Cr5MoSiV GB/T 1299 4Cr5MoSiV1 EN ISO 683-17 100Cr6 IS 1570 (Part 6) 103T3 IS 1570 (Part 6) 133T3 GOST 5950 4H5MFS DIN EN ISO 4957 1.2379 GOST 5950 3H2W8F EN ISO 4957 1.2316 IS 1570 (Part 6) 118T3
Match Breakdown
CHEMISTRY MATCH
67.1%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property ASTM A681 A4 KS D3867 SCM415
Standard ASTM A681:2008 KS D 3867:2025
Category Tool & Die Steels Alloy Steel
C (%) 0.95-1.05 0.17-0.23
Mn (%) 1.80-2.20 0.6-1.2
P (%) <=0.030 max 0.03
S (%) <=0.030 max 0.03
Si (%) 0.10-0.70 0.1-0.35
Cr (%) 0.90-2.20 0.15-0.35
Mo (%) 0.90-1.40 0.15-0.3
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A681 A4 KS D3867 SCM415
Hardness <=241 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Typical Applications
ASTM A681 A4
Tools, dies and fixtures (clause 1.2)
KS D3867 SCM415
Gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core.
Key Differences
Can ASTM A681 A4 Be Substituted With KS D3867 SCM415?
ASTM A681 A4 and KS D3867 SCM415 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
ASTM A681 A4
No active listings currently.
KS D3867 SCM415
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–5700 mm (204.72–224.41 in)
On M-EX Right Now
ASTM A681 A4
0 active listings and RFQs →
KS D3867 SCM415
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 A4 and KS D3867 SCM415?
Different category: ASTM A681 A4 is Tool & Die Steels, KS D3867 SCM415 is Alloy Steel.
Can ASTM A681 A4 be substituted with KS D3867 SCM415?
ASTM A681 A4 and KS D3867 SCM415 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.