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UNI 7846 18CrMo4 vs KS D3867 SCM415

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

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

As per chemical composition, UNI 7846 18CrMo4 vs KS D3867 SCM415 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 UNI 7846 18CrMo4:
GB/T 3077 12Cr2Ni4A UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
81.6%
MECHANICAL MATCH
No shared data
OVERALL
81.6%
Specifications
Property UNI 7846 18CrMo4 KS D3867 SCM415
Standard UNI 7846:1978 KS D 3867:2025
Category Alloy Steel Alloy Steel
C (%) 0.15-0.21 0.17-0.23
Si (%) 0.15-0.40 0.1-0.35
Mn (%) 0.60-0.90 0.6-1.2
Cr (%) 0.90-1.20 0.15-0.35
Mo (%) 0.15-0.30 0.15-0.3
P (%) 0.035 max max 0.03
S (%) 0.035 max max 0.03
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property UNI 7846 18CrMo4 KS D3867 SCM415
Tensile Strength 700-900 MPa Not specified
Yield Strength 540 MPa min Not specified
Elongation 14% min Not specified
Hardness 200-260 HB Not specified
Typical Applications
UNI 7846 18CrMo4
Used in gears, shafts, pinions, crankshafts, axles, and heavy machinery components.
KS D3867 SCM415
Gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core.
Can UNI 7846 18CrMo4 Be Substituted With KS D3867 SCM415?
UNI 7846 18CrMo4 and KS D3867 SCM415 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
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)
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
UNI 7846 18CrMo4
2 active listings and RFQs →
KS D3867 SCM415
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between UNI 7846 18CrMo4 and KS D3867 SCM415?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can UNI 7846 18CrMo4 be substituted with KS D3867 SCM415?
UNI 7846 18CrMo4 and KS D3867 SCM415 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.