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发明公开
CN104928591A 一种超低碳当量的Q550D高强钢及其生产方法 无效 - 驳回

一种超低碳当量的Q550D高强钢及其生产方法
摘要：
本发明涉及一种超低碳当量的Q550D高强钢，由以下元素按照质量百分比组成：C：0.05％-0.07％，Si：0.2％-0.3％，Mn：1.4％-1.6％，P≤0.015％，S≤0.003％，Cr：0.15％-0.2％，Nb：0.03％-0.04％，Ti:0.01％-0.02％，B：≤0.002％，Als≤0.035％，Ceq≤0.35％，余量为Fe及不可避免的杂质。本发明成功解决了热轧态高强钢强度高低塑性、低冲击功值以及焊接性不稳定的技术难点，能够较好的满足矿山机械、工程机械、装载汽车所需的焊接结构材料需求。
摘要（英）：

The invention relates to Q550D high-strength steel with ultra-low carbon equivalent. The Q550D high-strength steel comprises, by weight, 0.05% to 0.07% of C, 0.2% to 0.3% of Si, 1.4% to 1.6% of Mn, not greater than 0.015% of P, not greater than 0.003% of S, 0.15% to 0.2% of Cr, 0.03% to 0.04% of Nb, 0.01% to 0.02% of Ti, not greater than 0.002% of B, not greater than 0.035% of Als, not greater than 0.35% of Ceq, and the balance of Fe plus unavoidable impurity. The technical difficulty that hot-rolled high-strength steel has high strength but low plasticity, low impact energy and instable weldability is successfully solved, and the demands of mine machinery, engineering machinery and carrier vehicles for welding structure materials are well met.

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