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发明公开
CN104233074A 含铬的钒氮微合金化400MPa级钢筋用钢及其生产方法 无效 - 驳回

含铬的钒氮微合金化400MPa级钢筋用钢及其生产方法
摘要：
本发明提供一种含铬的钒氮微合金化400MPa级钢筋用钢，由下列元素组成：0.15-0.25%C，0.30-0.80%Si，0.40-1.20%Mn，0.31-0.60%Cr，0.020－0.060%V，0.0045－0.018%N，P≤0.045%，S≤0.045%。其生产方法为加热温度1050-1220℃，在950℃以上完成轧制；轧后快速冷却，轧件出精轧机后的冷却速度≥150℃/s，钢筋上冷床时表面温度控制在Ac3～Ac3+100℃或800-890℃，钢筋在冷床上自然冷却。钢筋力学性能都达到400MPa级钢筋的要求，室内环境下开始锈蚀的时间比不含铬钒氮微合金化400MPa级控冷钢筋明显延后。
摘要（英）：

The invention provides steel for a chromium-containing vanadium-nitrogen micro-alloyed 400MPa level reinforcing steel bar. The steel consists of the following elements in percentage by weight: 0.15-0.25% of C, 0.30-0.80% of Si, 0.40-1.20% of Mn, 0.31-0.60% of Cr, 0.020-0.060% of V, 0.0045-0.018% of N, less than or equal to 0.045% of P and less than or equal to 0.045% of S. The production method comprises the following steps: heating to 1050-1220 DEG C, and completing rolling at more than 950 DEG C; rapidly cooling after rolling, wherein the cooling speed of a rolled piece discharged from a finishing mill is more than or equal to 150 DEG C/s; and controlling the surface temperature of the reinforcing steel bar to be Ac3-(Ac3+100) DEG C or 800-890 DEG C when the reinforcing steel bar is loaded to a cooling bed, and naturally cooling the reinforcing steel bar on the cooling bed. All mechanical properties of the reinforcing steel bar can meet the requirements of the 400MPa level reinforcing steel bar, and the initial rusting time of the reinforcing steel bar is significantly delayed compared with that of a vanadium-nitrogen micro-alloyed 400MPa level cooling control reinforcing steel bar which does not contain chromium in an indoor environment.

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