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4140

Alias

4140
708M40
42CrMo4

Chemistry

Alloy Steel

Element Min Max
Cr (Chromium) 0.1%
Cu (Copper) 3.9% 5%
Fe (Iron) 1%
Mg (Magnesium) 0.05%
Mn (Manganese) 0.4% 1.2%
Si (Silicon) 0.5% 1.2%
Ti (Titanium) 0.15%
Zn (Zinc) 0.25%
Al (Aluminium) Balance
Mechanical Property Min Max
Ultimate Tensile Strength (UTS) 379 MPa
0.2% Proof Stress 228 MPa
Elongation 16%
Gauge Length A4D

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