AISI 4140 Steel: Specifications & Listings

AISI 4140: Chrome molybdenum alloy steel, high strength and toughness

Forms: Round Bar Forging Category: Alloy Steel
Grade Details
GradeAISI 4140
Standard AISI
ApplicationsGears, shafts, dies, bolts, crankshafts, tooling
Most Active InWest (Maharashtra, Gujarat)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
EN 10083-3 42CrMo4 EN 10083-3:2006 Europe 21 listings, 22 RFQs →
BS 970 EN19 BS 970:1955 UK 19 listings, 15 RFQs →
JIS G4105 SCM440 JIS G4105:1979 Japan 0 listings, 3 RFQs →
SAE J404 4140 SAE J404:2009 USA 16 listings, 17 RFQs →
SAE J404 4137 SAE J404:2009 USA No activity yet
SAE J404 4142 SAE J404:2009 USA No activity yet
SAE J404 4145 SAE J404:2009 USA No activity yet
SAE J404 4150 SAE J404:2009 USA No activity yet
SAE J404 4135 SAE J404:2000 USA No activity yet
SAE J404 4140 SAE J404:2000 USA No activity yet
BS 970 (Part 1) 708A40 BS 970 (Part 1):1983 UK No activity yet
Market Snapshot
See Full Price Gap →
7D Offer Price
● 0.0%
15D Offer Price
● 0.0%
30D Offer Price
▲ +0.3%
Supply & Demand by FormSee Full Supply & Demand →
Round Bar →
Deep Supply
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
SAE J404 4140 SAE J404:2009 Strong Match
SAE J404 4140 SAE J404:2000 Strong Match
SAE J404 4142 SAE J404:2009 Strong Match
SAE J404 4142 SAE J404:2000 Strong Match
SAE J404 4145 SAE J404:2009 Strong Match
SAE J404 4150 SAE J404:2009 Strong Match
SAE J404 4145 SAE J404:2000 Strong Match
SAE J404 4150 SAE J404:2000 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn Cr Mo Si S P
0.38–0.43 0.75–1.00 0.80–1.10 0.15–0.25 0.15–0.35 ≤0.040 ≤0.035
Mechanical Properties
Condition Quenched & Tempered
Tensile Strength 850–1000 MPa
Yield Strength ≥680 MPa
Elongation ≥13%
Hardness 248–302 HB
Impact (Charpy) ≥54 J
Typical Available Sizes
Round Bar 16mm–350mm dia
Flat Bar 20×8mm–250×75mm
Hex Bar 19mm–100mm A/F
Sizes are indicative. Contact seller for exact availability.

Popular forms for this grade:

Round Bar (3)

Active AISI 4140 Listings on M-EX (For Sale)

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AISI 4140 Round Bar
3.200 MT
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AISI 4140 Round Bar
5.100 MT
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AISI 4140 Round Bar
2.200 MT
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Buyer RFQs for AISI 4140

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