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CN101538681A 一种生产屈服强度700MPa级高强钢的方法 无效 - 撤回

一种生产屈服强度700MPa级高强钢的方法
摘要：
一种生产屈服强度700MPa级高强钢的方法，属于高强钢生产技术领域。其化学成分含量(Wt)为：0.03～0.08％C，0.20～0.50％Si，1.4～2.0％Mn，0.10～0.15％Ti，0.02～0.08％Nb，0～0.3％V，0.02～0.06％Al，限制元素S≤0.008％，N≤0.008％，P≤0.04％，余量为Fe及不可避免的杂质元素。工艺为：薄板坯连铸，铸坯入炉温度为950～1050℃，加热温度大于或等于1150℃，出炉温度1080～1160℃，终轧温度820～880℃，经层流冷却后，卷取温度550～620℃。本发明生产的高强钢的屈服强度范围在690MPa～760MPa，韧脆转变温度在－60℃以下，成品板厚度为1.4～9.0mm，焊接及冷弯成形性能优良，成本低，工艺简单可控。
摘要（英）：

The invention relates to a method for producing high-strength steel with yield strength of 700MPa level, and belongs to the technical field of high-strength steel production. The high-strength steel comprises the following components in percentage by weight: 0.03 to 0.08 percent of C, 0.20 to 0.50 percent of Si, 1.4 to 2.0 percent of Mn, 0.10 to 0.15 percent of Ti, 0.02 to 0.08 percent of Nb, 0 to 0.3 percent of V, 0.02 to 0.06 percent of Al, less than or equal to 0.008 percent of limited element S, less than or equal to 0.008 percent of N, less than or equal to 0.04 percent of P, and the balance of Fe and inevitable impurity elements. The process adopts a thin slab blank to continuously cast the steel, the charging temperature of a casting blank is between 950 and 1,050 DEG C, the heating temperature is more than or equal to 1,150 DEG C, the discharging temperature is between 1,080 and 1,160 DEG C, the final rolling temperature is between 820 and 880 DEG C, and after laminar cooling, the rolling temperature is between 550 and 620 DEG C. The yield strength of the high-strength steel produced by the method is in a range of 690MPa to 760MPa, the ductile-brittle transition temperature is below 60 DEG C below zero, the thickness of a finished product plate is 1.4 to 9.0 millimeters, the welding and cold-roll forming properties are good, the cost is low, and the process is simple and controllable.

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