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UNI 7846:1978 18CrMo4 Steel: Specifications & Listings

UNI 7846:1978 18CrMo4: 18CrMo4 is a chromium molybdenum carburizing steel with good hardenability and fatigue resistance. It is widely used for case hardened transmission components.

Forms: Round Bar Category: Alloy Steel
Grade Details
GradeUNI 7846:1978 18CrMo4
Standard UNI 7846:1978
ApplicationsUsed in gears, shafts, pinions, crankshafts, axles, and heavy machinery components.
Most Active InWest (Maharashtra)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
EN ISO 683-17 20CrMo4 EN ISO 683-17:2014 Europe 1 listing, 1 RFQ →
Supply & Demand by FormSee Full Supply & Demand →
Round Bar →
Low Activity
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 708M20 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 708H20 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 708H20 BS 970 (Part 1):1991 Close Alternative
KS D3867 SCM415 KS D 3867:2025 Close Alternative
EN ISO 683-17 20CrMo4 EN ISO 683-17:2014 Close Alternative
BS 970 (Part 1) 708A25 BS 970 (Part 1):1983 Close Alternative
IS 1570 (Part 4) 30Cr4Mo2 IS 1570 (Part 4):1988 Close Alternative
BS 970 (Part 1) 708A30 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 Cr Mo P S
0.15-0.21 0.15-0.40 0.60-0.90 0.90-1.20 0.15-0.30 0.035 max 0.035 max
Mechanical Properties
Tensile Strength 700-900 MPa
Yield Strength 540 MPa min
Elongation 14% min
Hardness 200-260 HB

Popular forms for this grade:

Round Bar (2)

Active UNI 7846:1978 18CrMo4 Listings on M-EX (For Sale)

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UNI 7846:1978 18CrMo4 Round Bar
3.600 MT
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UNI 7846:1978 18CrMo4 Round Bar
2.300 MT
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