| 摘要 |
<p>Disclosed are a cold-rolled steel sheet for enamel satisfying a tensile strength (TS) of 310 to 325 MPa, a yield point (YP) of 245 to 265, and an elongation (EL) of 42 to 45% by controlling an alloying element and a process condition, and a method for manufacturing the cold-rolled steel sheet for enamel. According to the present invention, the method for manufacturing the cold-rolled steel sheet for enamel includes: a step (a) of hot finished-rolling a slab sheet at finishing delivery temperature (FDT) of 900 to 950°C, wherein the slab sheet consists of 0.0022 to 0.0030 wt% of carbon (C), 0.020 to 0.026 wt% of silicon (Si), 1.3 to 1.5 wt% of manganese (Mn), 0.02 wt% or less of phosphorous (P), 0.02 wt% or less of sulfur (S), : 0.02 to 0.04 wt% of titanium (Ti), 0.02 to 0.04 wt% of niobium (Nb), 0.001 to 0.010 wt% of calcium (Ca), 0.01 wt% or less of aluminum (Al), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of oxygen (O), remainder iron (Fe) and inevitable impurities; a step (b) of winding the hot-rolled sheet after cooling the hot-rolled sheet up to a coiling temperature (CT) of 660 to 740°C; a step (c) of uncoiling and temper-rolling the wound sheet; a step (d) of cold-rolling the temper-rolled sheet after acid-pickling the temper-rolled sheet; and a step (e) of annealing the cold-rolled sheet at 600 to 700°C for 10 to 20 hours.</p> |
