Optimization of Surface Quality and Power Consumption in Machining Hardened AISI 4340 Steel

Table 1

The composition and properties of AISI 4340 steel.

Composition		Properties
Element	Content (%)	Physical properties
Fe	95.195–96.33	Properties	Metric
Ni	1.65–2.00	Density	7.85 g/cm^3
Cr	0.700–0.900	Melting point	1427°C
Mn	0.600–0.800
C	0.370–0.430	Mechanical properties
Mo	0.200–0.300	Tensile strength	745 MPa
Si	0.150–0.300	Yield strength	470 MPa
S	0.0400	Elastic modulus	190–210 Gpa
P	0.0350	Poisson’s ratio	0.27–0.30