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CN103422025A 屈服强度≥690MPa的低屈强比结构用钢及其生产方法 有权 转让

屈服强度≥690MPa的低屈强比结构用钢及其生产方法
摘要：
屈服强度≥690MPa的低屈强比结构用钢，其组分及重量百分比含量为：C：0.01~0.05%，Si：0.41~0.60%，Mn：2.10~3.50%，P≤0.010%，S≤0.005%，Mo：0.10~0.50%，Cr：0.51~0.80%，Cu：0.10~0.80%，Ni：0.05~0.50%，Nb：0.052~0.11%，V:0.053~0.10%，Ti：0.008~0.025%，Als：0.015~0.060%，Ca：0.0010~0.0080%，Mg：0.0005~0.0050%，N：0.0010~0.0030%，O：0.0005~0.0025%；生产步骤：冶炼并连铸成坯；对铸坯加热并保温；粗轧；精轧；对钢板进行弛豫缓冷；矫直。力学性能：RP0.2≥690MPa，Rm≥800MPa，延伸率A≥22%，-20℃KV2≥180J，RP0.2/Rm≤0.83；焊后不预热或预热温度不高于50℃，焊后不热处理，大大提高了焊接效率；具有良好的冷热加工性能及抗大变形抗力。
摘要（英）：

Steel for a low-yield-ratio structure with the yield strength larger than or equal to 690MPa comprises, by weight, 0.01-0.05% of C, 0.41-0.60% of Si, 2.10-3.50% of Mn, less than 0.010% of P, less than 0.005% of S, 0.10-0.50% of Mo, 0.51-0.80% of Cr, 0.10-0.80% of Cu, 0.05-0.50% of Ni, 0.052-0.11% of Nb, 0.053-0.10% of V, 0.008-0.025% of Ti, 0.015-0.060% of Als, 0.0010-0.0080% of Ca, 0.0005-0.0050% of Mg, 0.0010-0.0030% of N and 0.0005-0.0025% of O. A production method includes the steps of steel making, continuous casting for billet formation, heating of cast billets, temperature preservation, rough rolling, fine rolling, relaxing and slow cooling of a steel plate, and straightening. The mechanical properties of the steel include RP0.2 is larger than or equal to 690MPa, Rm is larger than or equal to 800MPa, the ductility A is larger than or equal to 22%, KV2 at the temperature of -20 DEG C is larger than or equal to 180J, and RP0.2/Rm is smaller than or equal to 0.83. The steel after welding is not preheated or the preheating temperature is not higher than 50 DEG C, heating processing is not carried out after welding, welding efficiency is greatly improved, and the steel has good cold and hot machining performance and high deformation resistance.

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