Patent ID: 7666350

Claim:
A low-carbon resulfurized free machining steel product, comprising, on the percent by mass basis, C: 0.02% to 0.12%, Si: 0.01% or less, Mn: 1.0% to 2.0%, P: 0.05% to 0.20%, S: 0.35% to 0.60%, N: 0.007% to 0.03%, with the balance being Fe and inevitable impurities, the contents of and S satisfying the following conditions: 0.40<Mn*S<1.2 and Mn/S>3.0, and the steel product having a ferrite-pearlite structure, wherein the average width (μm) of sulfide inclusions in the steel product is 2.8*(log d) or more, wherein d is the diameter (mm) of the steel product, and pro-eutectoid ferrite in the metallographic structure has a hardness HV of 133 to 150.