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发明授权
CN101994056B 具有优良冲压性能的超低碳烘烤硬化钢板及其制造工艺 有权

具有优良冲压性能的超低碳烘烤硬化钢板及其制造工艺
摘要：
本发明涉及一种具有优良冲压性能的超低碳烘烤硬化钢板，其特征在于，其成分重量百分配比为：C 0.0010～0.0030％，Si 0.035～0.065％，Mn 0.10～0.17％，P 0.015～0.025，Al 0.015～0.045，S≤0.010％，N≤0.0030％，Ti 0.007～0.014％，其余为Fe，其中C％/Ti％满足下式定义的k值：K＝4*C％/Ti％＝0.8～1.2。钢板按下述方法轧制而成：1)热轧：开轧温度1000～1160℃，终轧温度为920～945℃；2)冷轧：冷轧压下率75～85％；3)连续退火。本发明的有益效果是：本发明通过在超低碳钢中添加微量的低成本的Ti，使之除了具有合适的烘烤硬化性外还具有优异的冲压性能，适用于汽车上钣金冲压部件，大大减轻车身重量。
摘要（英）：

The invention relates to an ultra-low carbon bake-hardening steel plate with excellent stamping performance, which is characterized by comprising the following components in weight percent: 0.0010-0.0030% of C, 0.035-0.065% of Si, 0.10-0.17% of Mn, 0.015-0.025% of P, 0.015-0.045% of Al, 0.010% of S or less, 0.0030% of N or less, 0.007-0.014% of Ti and the balance of Fe, wherein C%/Ti% meets the value k defined in the following formula, K=4*C%/Ti%=0.8-1.2. The steel plate is rolled by the following methods: (1) hot rolling, wherein the rolling temperature ranges from 1,000 DEG C to 1,160 DEG Cand the final rolling temperature ranges from 920 DEG C to 945 DEG C; (2) cold rolling, wherein the cold rolling pressing rate is 75-85%; and (3) continuous annealing. By adding a trace amount of low-cost Ti in the ultra-low carbon steel, the ultra-low carbon bake-hardening steel plate has the advantages of proper bake-hardening performance and excellent stamping performance, is suitable for metal plate stamping members on an automobile and greatly reduces the weight of the automobile body.

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