| 摘要 |
<p>A low carbon sulphur free-cutting steel which, in terms of mass%, is comprised of between 0.04-0.15% C, between 0.10-0.70% Si, between 0.85-1.50% Mn, between 0.040-0.120% P, between 0.250-0.400% S, less than 0.005% Al, between 0.0020-0.0120% O, between 0.0070-0.0150% N, with the remainder being Fe and unavoidable impurities; and which fulfills formula (1) and formula (2). 0.15%=Si%+2×P%-(5×Al%+10×O%+3×N%)=0.75% (1) ([Mn%]5)/155)/2 (2)</p> |
