| 摘要 |
<p>The present invention relates to a lightweight hot rolled steel sheet having excellent hot rolling and corrosion resistance properties, and to a manufacturing method thereof. According to an embodiment of the present invention, provided is a lightweight hot rolled steel sheet having excellent hot rolling and corrosion resistance properties, comprising: less than or equal to 0.5 wt% of C; 12-18 wt% of Al; 0.1-2.0 wt% of Ti; 0.3-1.0 wt% of Cu; 5-12 wt% of Cr; 0.1-0.5 wt% of Ni; 0.5-3.0 wt% of Mn; 0.001-0.1 wt% of B; less than or equal to 0.01 wt% of S; less than or equal to 0.02 wt% of P; less than or equal to 0.01 wt% of N; and residual Fe and other inevitable impurities, wherein an anti-phase boundary energy is less than or equal to 70 mJ/m^2. Also, provided is a manufacturing method thereof. The steel sheet improves ordered phase such as B2, DO3, etc, and matching of BCC between phase, and inhibits formation of carbide precipitates; thereby having excellent productivity as crack does not occur during hot rolling even if Al which is an element with a low melting point is added for more than or equal to 12%, having high softness and low specific gravity, and having excellent corrosion resistance under sulfuric acid.</p> |
