| 摘要 |
Provided are a high strength cold-rolled steel sheet with excellent weather resistance and a manufacturing method thereof. The cold-rolled sheet includes, by weight, 0.08 to 0.20% C, 0.1 to 0.5% Si, 1.2 to 2.0% Mn, =0.03% P, =0.01% S, 0.02 to 0.07% Al, 0.02 to 0.06% V, 0.2 to 0.5% Cu, 0.3 to 0.8% Cr, 0.04 to 0.08% Zr, 0.02 to 0.08% Co, 0.02 to 0.07% W, the balance being Fe and unavoidable impurities. According to the cold-rolled steel sheet and the manufacturing method thereof, a high strength cold-rolled steel sheet with excellent weather resistance, mechanical properties and high yield ratio can be obtained by appropriately controlling components and process conditions. Therefore, it is possible to manufacture a high value-added steel sheet for use in outdoor structures requiring high impact resistance. Also, annealing process is performed in a relatively low-temperature range, thereby saving energy and improving annealing efficiency.
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