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发明公开
CN104593665A 一种基于CSP工艺的厚规格热轧双相钢制造方法 无效 - 驳回

一种基于CSP工艺的厚规格热轧双相钢制造方法
摘要：
本发明公开了一种基于CSP工艺的热轧双相钢制造方法，包括：（1）配置原料：化学成分按重量百分比为0.055~0.070%C，0.40~0.50%Si，1.20~1.50%Mn，P≤0.015%，S≤0.002%，余量为Fe及不可避免的杂质；（2）依次进行钢水预处理→转炉顶底复合吹炼→LF精炼处理→薄板坯连铸→隧道炉均热→F1~F7七机架热连轧机组连轧→层流冷却系统冷却→超快冷系统冷却→卷取。所述的制造方法中连铸坯经隧道均热炉的出炉温度≥1130℃，热连轧开轧温度≥1010℃，F1机架压下率≥40%，F2机架≥33.3%，层冷+空冷后温度600~690℃，超快冷后温度150~250℃，超快冷冷却速率为70~150℃/s。本发明采用简单的低C-Mn成分体系，工业化批量生产的11.0mm厚度规格590MPa级双相钢厚度方向组织均为铁素体和马氏体的双相组织，综合性能优异。
摘要（英）：

The invention discloses a method for manufacturing hot-rolled dual-phase steel based on a CSP (Compact Strip Production) process. The method comprises the following steps: (1) preparing a raw material comprising the following chemical compositions in percentage by weight: 0.055-0.070% of C, 0.40-0.50% of Si, 1.20-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S and the balance of Fe and unavoidable impurities; and (2) sequentially pretreating molten steel, carrying out converter top and bottom combined blowing, refining in an LF, continuously casting thin billet, soaking in a tunnel furnace, continuously rolling by virtue of an F1-F7 seven-stand hot continuous rolling mill group, cooling by virtue of a laminar cooling system, cooling by virtue of an ultra-fast cooling system and coiling. In the method, the out-of-furnace temperature of the continuous casting billet passing through the tunnel soaking furnace is equal to or greater than 1130 DEG C, the initial rolling temperature in the hot continuous rolling step is equal to or greater than 1010 DEG C, the reduction rate in an F1 stand is equal to or greater than 40%, the reduction rate in an F2 stand is equal to or greater than 33.3%, the temperature after the laminar cooling and air cooling is 600-690 DEG C, the temperature after ultra-fast cooling is 150-250 DEG C, the ultra-fast cooling speed is 70-150 DEG C/s. The microstructures of 11.0mm-thickness 590MPa-grade dual-phase steel in the thickness direction, which is produced from a simple low C-Mn-component system in an industrial mass manner, are ferrite and martensite duplex microstructures so that the dual-phase steel is excellent in comprehensive performance.

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