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发明公开
CN103667893A 屈强比≤0.5的具有抗延迟断裂的高强钢及生产方法 失效 - 权利终止 转让

屈强比≤0.5的具有抗延迟断裂的高强钢及生产方法
摘要：
屈强比≤0.5的具有抗延迟断裂的高强钢，其组分及wt%为：C：0.11~0.25%，Mn：15.5~17.5%，Mo：0.030~0.050%，Co：0.005~0.02%，B：0.005~0.009%，N：0.009~0.011%，La+Ce+Nd：0.011~0.025%；生产步骤：铁水脱硫；转炉冶炼；RH真空处理；连铸；热轧，终轧温度在755~790℃；冷轧，其压下率在51~54%；连续退火。本发明解决了现有同级别高强钢延伸率低、屈强比高和焊接性能不好的问题，避免了延迟断裂现象发生；其制造的汽车防撞部件优于其它冷轧高强钢的成形性、焊接性能以及能量吸收性能，大大增加了产品的使用安全性和减重节能性；采用了B、Mo、Co、N，实现细晶强化和析出强化，保证了低屈强比和耐热性、耐腐蚀性；钢板还具有双重效应和低屈强比，保证了材料良好的成形加工能力和承载性以及抗断裂性。
摘要（英）：

The invention provides high-strength anti-delayed fracture steel with a yield ratio of no more than 0.5. The steel comprises, by weight, 0.11 to 0.25% of C, 15.5 to 17.5% of Mn, 0.030 to 0.050% of Mo, 0.005 to 0.02% of Co, 0.005 to 0.009% of B, 0.009 to 0.011% of N and 0.011 to 0.025% of La+Ce+Nd. A production method for the steel comprises the following steps: desulphurization of molten iron; converter smelting; RH vacuum treatment; continuous casting; hot rolling, wherein finish rolling temperature is in a range of 755 to 790 DEG C; cold rolling, wherein a reduction rate is 51 to 54%; and continuous annealing. According to the invention, the problems of low elongation percentage, a high yield ratio and poor welding performance of high-strength steel of a same grade are overcome, and the phenomenon of delayed fracture is avoided; an automobile crash-proof part manufactured from the steel has better formability, welding performance and energy absorption performance compared with other cold-rolled high-strength steel, and use security, weight reduction performance and energy saving performance of a product are substantially improved; B, Mo, Co and N are employed, so refined crystalline strengthening and precipitation strengthening are realized, and a low yield ratio, heat resistance and corrosion resistance are guaranteed; a steel plate has double effects and a low yield ratio, and good forming capability, good bearing performance and anti-fracture performance of a material are guaranteed.

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