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KS D3867 SCM415 vs UNI 7846 18CrMo4

Close Alternative — 81.6% match based on chemical composition and mechanical property overlap.

KS D3867 SCM415 (KS D 3867:2025) and UNI 7846 18CrMo4 (UNI 7846:1978) are both steel grades. Both fall under the Alloy Steel category. KS D3867 SCM415 is typically used for gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core., while UNI 7846 18CrMo4 is commonly used for used in gears, shafts, pinions, crankshafts, axles, and heavy machinery components.. KS D3867 SCM415 is defined under Korean Industrial Standards (KS), originating from South Korea, while UNI 7846 18CrMo4 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy.

As per chemical composition, KS D3867 SCM415 vs UNI 7846 18CrMo4 is a 81.6% 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 81.6%.

Frequently Compared With KS D3867 SCM415:
NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 7) 12Cr4Mo5H GOST 4543 12HN3A IS 11169 (Part 1) 12Cr4Mo2 GB/T 3077 12Cr2Ni4A IS 1570 (Part 7) 12Cr9Mo10H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
81.6%
MECHANICAL MATCH
No shared data
OVERALL
81.6%
Specifications
Property KS D3867 SCM415 UNI 7846 18CrMo4
Standard KS D 3867:2025 UNI 7846:1978
Category Alloy Steel Alloy Steel
C (%) 0.17-0.23 0.15-0.21
Mn (%) 0.6-1.2 0.60-0.90
Si (%) 0.1-0.35 0.15-0.40
P (%) max 0.03 0.035 max
S (%) max 0.03 0.035 max
Cr (%) 0.15-0.35 0.90-1.20
Mo (%) 0.15-0.3 0.15-0.30
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 SCM415 UNI 7846 18CrMo4
Tensile Strength Not specified 700-900 MPa
Yield Strength Not specified 540 MPa min
Elongation Not specified 14% min
Hardness Not specified 200-260 HB
Typical Applications
KS D3867 SCM415
Gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core.
UNI 7846 18CrMo4
Used in gears, shafts, pinions, crankshafts, axles, and heavy machinery components.
Can KS D3867 SCM415 Be Substituted With UNI 7846 18CrMo4?
KS D3867 SCM415 and UNI 7846 18CrMo4 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 SCM415
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–5700 mm (204.72–224.41 in)
UNI 7846 18CrMo4
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–5400 mm (204.72–212.6 in)
On M-EX Right Now
KS D3867 SCM415
2 active listings and RFQs →
UNI 7846 18CrMo4
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3867 SCM415 and UNI 7846 18CrMo4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can KS D3867 SCM415 be substituted with UNI 7846 18CrMo4?
KS D3867 SCM415 and UNI 7846 18CrMo4 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.