Table 1.

Chemical compositions (wt.%) of AISI grade plain carbon steels studied, determined by optical emission spectrometer (MetaLab, Germany)

AISI Steel Grade	C	Mn	Si	P	S
1020	0.19	0.49	0.24	0.015	0.023
1030	0.34	0.73	0.27	0.019	0.023
1040	0.37	0.82	0.26	0.013	0.023
1045	0.45	0.68	0.24	0.019	0.018
1050	0.54	0.79	0.34	0.016	0.030