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发明公开
CN103205628A 一种HRB400螺纹钢的生产方法 无效 - 撤回

一种HRB400螺纹钢的生产方法
摘要：
本发明涉及一种HRB400螺纹钢的生产方法，其特征是：螺纹钢的化学成分要求碳含量0.21～0.25wt%，硅含量0.65～0.80wt%，锰含量1.20～1.40wt%，磷含量小于等于0.045wt%，硫含量小于等于0.045wt%；生产工艺控制转炉终点钢水的碳含量、磷含量及出钢温度为：碳含量C≥0.06wt%，P≤0.030wt%，出钢温度1620～1644℃；LF精炼中电石加入量控制在50～100kg；连铸生产过热度控制在30±5℃，拉速控制在2.2～2.4m/min范围以内。轧制生产中Φ8mm、Φ10mm、Φ12mm、Φ14mm钢筋开轧温度均在970℃～1000℃之间，精轧入口温度在940℃～960℃之间，斯太尔摩冷却线保温罩全部打开。其优点是：用本方法生产的螺纹钢性能稳定、成本合理。
摘要（英）：

The invention relates to a production method of HRB400 (Rockwell Hardness) deformed steel bar. The method is characterized in that the chemical component of the deformed steel bar comprises 0.21-0.25wt% of carbon, 0.65-0.80wt% of silicon, 1.20-1.40wt% of manganese, less than or equal to 0.045wt% of phosphorus, and less than or equal to 0.045wt% of sulphur. The method comprises the following steps of: controlling the carbon and phosphorus contents of molten steel at the finish point of a converter and the tapping temperature as follows: C is greater than or equal to 0.06wt%, P is less than or equal to 0.030wt% and the tapping temperature at 1620-1644 DEG C; controlling the addition of calcium carbide in LF (Low Frequency) refinery within 50-100kg; controlling the degree of superheat in casting production at 30 DEG C, 5 DEG C plus or minus, controlling the pulling rate at 2.2-2.4m/min; controlling the rolling temperature of reinforcing steel bars with diameters of 8mm, 12mm and 14mm at 970-1000 DEG C, controlling the finishing inlet temperature at 940-960 DEG C; and opening the Stelmor cooling line protective hoods completely. The method has the advantages that the deformed steel bar produced by the method is stable in performance and reasonable in cost.

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