Grade comparison tool

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Item	4140	42CrMo4
Category	Alloy & Engineering Steel	Alloy & Engineering Steel
din	1.7225 (42CrMo4)	1.7225 (42CrMo4)
aisi	4140	4140
jis	SCM440	SCM440
gb	42CrMo	42CrMo
Description	4140 is the most popular Cr-Mo engineering steel in the world: a through-hardening grade for shafts, gears, bolts and hydraulic parts that need strength with machinability. Supplied annealed, normalized or prehardened as round bar.	42CrMo4 is the EN quenched-and-tempered Cr-Mo steel (1.7225), the European counterpart of AISI 4140 and one of the highest-volume engineering steels traded globally.
C %	0.38–0.43	0.38–0.45
Si %	0.15–0.35	≤0.40
Mn %	0.75–1.00	0.60–0.90
P %	≤0.035	≤0.025
S %	≤0.040	≤0.035
Cr %	0.80–1.10	0.90–1.20
Mo %	0.15–0.25	0.15–0.30
Hardness (Q&T)	28–40 HRC typical	28–40 HRC typical
Tensile strength	850–1100 MPa (Q&T)	900–1200 MPa (Q&T, EN 10083 size bands)
Yield strength	≥650 MPa (Q&T, section dependent)	—
Density	7.85 g/cm³	7.85 g/cm³
Elastic modulus	210 GPa	210 GPa
Heat treatment	Normalize 870 °C; quench 845 °C oil; temper 540–660 °C to required hardness. Also widely used prehardened (28–32 HRC).	Quench 840–870 °C oil; temper 540–680 °C per EN 10083-3 property bands.
Equivalent grades	42CrMo4, SCM440, 40Cr	4140, SCM440

Data compiled from public standards and handbooks — verify critical values against the governing standard and mill certificate before use.