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KS D3867 SCM440 vs UNI 7845 42CrMo4

Strong Match — 95.2% match based on chemical composition and mechanical property overlap.

KS D3867 SCM440 (KS D 3867:2025) and UNI 7845 42CrMo4 (UNI 7845:1978) 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 UNI 7845 42CrMo4 is commonly used for shafts,gears,axles,studs,forgings,machine components,automotive parts,hydraulic parts. KS D3867 SCM440 is defined under Korean Industrial Standards (KS), originating from South Korea, while UNI 7845 42CrMo4 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy.

As per chemical composition, KS D3867 SCM440 vs UNI 7845 42CrMo4 is a 92.9% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 95.2%.

Frequently Compared With KS D3867 SCM440:
NF A35-565 100C6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 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
92.9%
MECHANICAL MATCH
100%
OVERALL
95.2%
Specifications
Property KS D3867 SCM440 UNI 7845 42CrMo4
Standard KS D 3867:2025 UNI 7845:1978
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.38-0.45
Si (%) 0.15-0.35 <=0.40
Mn (%) 0.60-0.85 0.60-0.90
P (%) <=0.030 <=0.025
S (%) <=0.030 <=0.035
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 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 SCM440 UNI 7845 42CrMo4
Tensile Strength 900-1100 MPa 900-1100 MPa
Yield Strength 700-900 MPa 700-900 MPa
Elongation 11-16 % 11-16 %
Hardness 248-320 HB 248-320 HB
Typical Applications
KS D3867 SCM440
shafts,gears,axles,bolts,automotive parts,machine components,spindles,hydraulic parts
UNI 7845 42CrMo4
shafts,gears,axles,studs,forgings,machine components,automotive parts,hydraulic parts
Can KS D3867 SCM440 Be Substituted With UNI 7845 42CrMo4?
KS D3867 SCM440 and UNI 7845 42CrMo4 overlap closely enough on chemistry and mechanical properties that UNI 7845 42CrMo4 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)
UNI 7845 42CrMo4
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6300 mm (196.85–248.03 in)
On M-EX Right Now
KS D3867 SCM440
2 active listings and RFQs →
UNI 7845 42CrMo4
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between KS D3867 SCM440 and UNI 7845 42CrMo4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can KS D3867 SCM440 be substituted with UNI 7845 42CrMo4?
KS D3867 SCM440 and UNI 7845 42CrMo4 overlap closely enough on chemistry and mechanical properties that UNI 7845 42CrMo4 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.