| 摘要 |
<p>Provided is a high carbon hot-rolled steel sheet possessing stable, excellent cold workability and hardenability; and a method for producing the same. The high carbon hot-rolled steel sheet contains by mass 0.20-0.48% C, at most 0.1% Si, at most 0.5% Mn, at most 0.03% P, at most 0.01% S, more than 0.10% to 1.0% sol.Al, at most 0.005% N, and 0.0005-0.0050% B, the remainder having a composition comprising Fe and unavoidable impurities; and has a microstructure comprising ferrite and cementite, the average particle size of the ferrite being 10-20µm and the spheroidization rate of the cementite being no less than 90%.</p> |
