| 摘要 |
<p>PURPOSE: A hot-rolled steel sheet with superior aging resistance and a method for manufacturing the same are provided to ensure improved pickling efficiency and prevent environmental pollutions due to the superior descaling property. CONSTITUTION: A method for manufacturing a hot-rolled steel sheet comprises a step of shot-blasting shot balls of 0.10-0.40mm at injection speed of 60-80m/sec to the surface of a hot-rolled steel sheet made from steel which comprises C(Carbon) of 0.01-0.08wt.%, Mn(Manganese) of 0.1-0.3wt.%, P(Phosphorus) of 0.003-0.202wt.%, S(Sulfur) of 0.020wt.% or less(except 0%), Al(Aluminum) of 0.01-0.07wt.%, N(Nitrogen) of 0.001-0.004wt.%, and Fe(Iron) and inevitable impurities of the remaining amount.</p> |
