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UNI 7845 42CrMo4 vs KS D3867 SCM440

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

UNI 7845 42CrMo4 (UNI 7845:1978) and KS D3867 SCM440 (KS D 3867:2025) are both steel grades. Both fall under the Alloy Steel category. UNI 7845 42CrMo4 is typically used for shafts,gears,axles,studs,forgings,machine components,automotive parts,hydraulic parts, while KS D3867 SCM440 is commonly used for shafts,gears,axles,bolts,automotive parts,machine components,spindles,hydraulic parts. UNI 7845 42CrMo4 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy, while KS D3867 SCM440 is defined under Korean Industrial Standards (KS), originating from South Korea.

As per chemical composition, UNI 7845 42CrMo4 vs KS D3867 SCM440 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 UNI 7845 42CrMo4:
NF A35-565 100C6 UNI 11234 100Cr6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
92.9%
MECHANICAL MATCH
100%
OVERALL
95.2%
Specifications
Property UNI 7845 42CrMo4 KS D3867 SCM440
Standard UNI 7845:1978 KS D 3867:2025
Category Alloy Steel Alloy Steel
C (%) 0.38-0.45 0.38-0.43
Si (%) <=0.40 0.15-0.35
Mn (%) 0.60-0.90 0.60-0.85
P (%) <=0.025 <=0.030
S (%) <=0.035 <=0.030
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 UNI 7845 42CrMo4 KS D3867 SCM440
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
UNI 7845 42CrMo4
shafts,gears,axles,studs,forgings,machine components,automotive parts,hydraulic parts
KS D3867 SCM440
shafts,gears,axles,bolts,automotive parts,machine components,spindles,hydraulic parts
Can UNI 7845 42CrMo4 Be Substituted With KS D3867 SCM440?
UNI 7845 42CrMo4 and KS D3867 SCM440 overlap closely enough on chemistry and mechanical properties that KS D3867 SCM440 is often considered as a substitute for UNI 7845 42CrMo4 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
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)
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)
On M-EX Right Now
UNI 7845 42CrMo4
2 active listings and RFQs →
KS D3867 SCM440
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between UNI 7845 42CrMo4 and KS D3867 SCM440?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can UNI 7845 42CrMo4 be substituted with KS D3867 SCM440?
UNI 7845 42CrMo4 and KS D3867 SCM440 overlap closely enough on chemistry and mechanical properties that KS D3867 SCM440 is often considered as a substitute for UNI 7845 42CrMo4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.