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UNI 7845:1978 42CrMo4 Steel: Specifications & Listings

UNI 7845:1978 42CrMo4: UNI 42CrMo4 is a chromium molybdenum alloy steel per Italian Standard UNI 7845, equivalent to DIN 42CrMo4 and EN19. It provides high tensile strength, toughness and good fatigue resistance in quenched and tempered condition for demanding engineering applications.

Forms: Round Bar Category: Alloy Steel
Grade Details
GradeUNI 7845:1978 42CrMo4
Standard UNI 7845:1978
Applicationsshafts,gears,axles,studs,forgings,machine components,automotive parts,hydraulic parts
Most Active InNorth (Punjab, Haryana)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
EN 10083-3 42CrMo4 EN 10083-3:2006 Europe 21 listings, 22 RFQs →
AISI 4140 AISI USA 3 listings, 0 RFQs →
BS 970 EN19 BS 970:1955 UK 19 listings, 15 RFQs →
JIS G4105 SCM440 JIS G4105:1979 Japan 0 listings, 3 RFQs →
GB/T 3077 42CrMo GB/T 3077:2015 China 2 listings, 0 RFQs →
KS D3867 SCM440 KS D 3867:2025 Korea 2 listings, 0 RFQs →
BS 970 (Part 1) 708M40 BS 970 (Part 1):1991 UK 2 listings, 0 RFQs →
Supply & Demand by FormSee Full Supply & Demand →
Round Bar →
Low Activity
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
SS 14 22 44 2244 SS 14 22 44 Strong Match
IS 1570 (Part 4) 42Cr4Mo2 IS 1570 (Part 4):1988 Strong Match
KS D3867 SCM440 KS D 3867:2025 Strong Match
BS 970 (Part 3) 708M40 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 3) 709M40 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 708M40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708A40 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 708A42 BS 970 (Part 1):1983 Close Alternative
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Si Mn P S Cr Mo
0.38-0.45 <=0.40 0.60-0.90 <=0.025 <=0.035 0.90-1.20 0.15-0.30
Mechanical Properties
Tensile Strength 900-1100 MPa
Yield Strength 700-900 MPa
Elongation 11-16 %
Hardness 248-320 HB
Typical Available Sizes
Round Bar 16-500 mm
Flat Bar 20-150 mm
Sizes are indicative. Contact seller for exact availability.

Popular forms for this grade:

Round Bar (2)

Active UNI 7845:1978 42CrMo4 Listings on M-EX (For Sale)

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Buyer RFQs for UNI 7845:1978 42CrMo4

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UNI 7845:1978 42CrMo4 Round Bar
7.000 MT
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UNI 7845:1978 42CrMo4 Round Bar
4.200 MT
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