| 摘要 |
<p>The present invention relates to a hot rolled steel sheet having excellent stretch flangeability and a method of manufacturing the same comprising: 0.05-0.10 wt% of carbon (C), 0.10-0.20 wt% of silicone (Si) , 0.5-1.0 wt% of manganese (Mn), 0.005-0.02 wt% of phosphorus (P), 0.001-0.010 wt% of sulfur (S), 0.001-0.060 wt% of aluminium (Al), 0.005-0.025 wt% of niobium (Nb) , 0.001-0.008 wt% of nitrogen (N) , residual iron (Fe), and unavoidable impurities.</p> |
