AISI 4140 Normalized Mechanical Properties, Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C )

AISI 4140
Condition	Normalized

Young’s modulus	208	–	216	GPa
Specific stiffness	26.5	–	27.5	MN.m/kg
Yield strength (elastic limit)	595	–	715	MPa
Tensile strength	915	–	1130	MPa
Specific strength	75.8	–	91.1	kN.m/kg
Elongation	13.5	–	21.5	% strain
Compressive strength	595	–	715	MPa
Flexural modulus	208	–	216	GPa
Flexural strength (modulus of rupture)	595	–	715	MPa
Shear modulus	80	–	85	GPa
Bulk modulus	161	–	176	GPa
Poisson’s ratio	0.285	–	0.295
Shape factor	39
Hardness – Vickers	275	–	335	HV
Elastic stored energy (springs)	841	–	1200	kJ/m^3
Fatigue strength at 10^7 cycles	402	–	465	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	350	–	534	MPa

AISI 4140 Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C )
UNS number	G41400
US name	SAE H41400, SAE 4140, SAE 4142, SAE 4140, ASTM J 70, ASTM J 65, ASTM J 55, ASTM 4140, ASTM G41420, ASTM E7140, ASTM B7M, ASTM B16, ASTM 4142H, ASTM 4142, ASTM 4140H, ASTM 4140, ASTM 4137H, ASTM 41, ~SAE 4137H, ~ASTM B4D, ~ASTM 6
EN name	~42CrMoS4, ~42CrMo4
EN number	~1.7227, ~1.7223
ISO name	~ 42 CrMoS 4, ~ 42 CrMo 4, ~42CrMo4
GB (Chinese) name	~42CrMo
JIS (Japanese) name	SNB22-5, SNB22-4, SNB22-3, SNB22-2