Patent ID: 8691141

Claim:
A low carbon resulfurized free cutting steel consisting of 0.04 to 0.15% of C, 0.31% to 0.70% of Si, 0.85 to 1.50% of Mn, 0.040 to 0.120% of P, 0.250% to less than 0.400% of S, less than 0.005% of Al, 0.0044% to 0.0120% of 0, and 0.0099% to 0.0150% of N, all by mass percentage, and the balance of Fe and inevitable impurities, and satisfying a formula (1) and a formula (2), as follows: 0.36%≦Si %+2×P %−(5×Al %+10×O %+3×N %)≦0.75% (1), and ([Mn %] 5 )/15<S %<([Mn %] 5 )/2 (2).