首页|拉速对MCCR工艺生产低碳铝镇静钢轧板中夹杂物的影响

拉速对MCCR工艺生产低碳铝镇静钢轧板中夹杂物的影响

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多模式薄板坯连续铸轧生产线(MCCR)既不同于传统连铸-轧制工艺,又异于传统薄板坯连铸连轧工艺,目前在国内外只有一条产线.MCCR工艺生产采用高拉速浇铸,具有大的通钢量,拉速对此工艺生产的轧板洁净度尤其是钢中非金属夹杂物特征影响较大.基于此,采用自动扫描电镜探究了 4.7～5.2 m/min范围内拉速对MCCR工艺生产的低碳铝镇静钢轧板中非金属夹杂物特征的影响规律.结果表明,轧板中夹杂物主要为Al2O3-CaO类型,夹杂物中Al2O3质量分数为69%～72%、CaO质量分数为16%～22%,夹杂物成分随着拉速的增加基本不发生改变.轧板中5 μm以上夹杂物随拉速的变化规律与2 μm以上夹杂物随拉速的变化规律相反.随着拉速的增加,轧材中尺寸大于2 μm夹杂物的数密度和面积分数整体呈小幅上升趋势,但平均尺寸变化不大.然而,随着拉速由4.7 m/min升高到5.0 m/min的过程,轧板中尺寸大于5 μm夹杂物的数密度、面积分数和检测到的最大尺寸均呈现减小趋势,且在轧板宽度方向的波动也减小.拉速升至5.0 m/min以上后轧板中尺寸大于5 μm夹杂物特征变化不大.从凝固前沿夹杂物受力的角度解释了钢中大尺寸夹杂物数量随拉速升高而降低的现象.基于研究结果,建议MCCR工艺生产低碳铝镇静钢时宜采用5.0 m/min以上的连铸拉速.
Effect of casting speed on inclusions in rolled plate of low carbon aluminum killed steels produced by MCCR process
The multi-mode thin plate continuous casting and rolling(MCCR)production line is not only different from traditional continuous casting-hot rolling processes,but also from traditional thin plate continuous casting and rolling processes.Currently,there is only one MCCR production line in China and abroad.The MCCR process adopts high casting speed casting,which has a large steel throughput.The casting speed has a significant impact on the cleanliness of the rolled plates produced by this process,especially the characteristics of non-metallic inclusions in the steel.Based on this,in the current work,the effect of casting speed in the range of 4.7-5.2 m/min on the characteristics of non-metallic inclusions in rolled plates of a low carbon aluminum killed steel produced by MCCR process was investigated employing the automatic scanning electron microscopy.The results showed that the inclu-sions in the rolled plate were mainly Al2O3-CaO type,with the mass percent of Al2O3 of 69%-72%and the mass percent of CaO of 16%-22%.The composition of inclusions was almost unchanged with the increase of casting speed.The characteristic evolution of>5 μm inclusions in the plate with casting speed showed an opposite trend with that of>2 μm inclusions.As the casting speed increased,the number density and area percent of>2 μm inclu-sions in the rolled plate overall showed a slight upward trend,but the average size of inclusions changed little.How-ever,as the casting speed increased from 4.7 m/min to 5.0 m/min,the number density,area percent,and detected maximum size of>5 μm inclusions all showed a decreasing trend,and their fluctuation in the width direction of the rolled plate also decreased.While the characteristics of>5 μm inclusions almost kept unchanged when the casting speed increased to over 5.0 m/min.The phenomenon that the number of large-sized inclusions in steel decreased with increasing casting speed was explained from the perspective of the forces on inclusions at the solidification front.Based on the results,it was recommended to use a continuous casting speed of 5.0 m/min or above when producing low-carbon aluminum killed steels under the MCCR process.

multi-mode continuous casting and rollinglow carbon aluminum killed steelhigh casting speedinclu-sionsolidification front

杨文、王乐瑶、刘金刚、袁天祥、张立峰、杨光、李阳、闫占辉

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北京科技大学冶金与生态工程学院,北京 100083

首钢集团有限公司技术研究院,北京 100043

燕山大学机械工程学院,河北 秦皇岛 066004

首钢京唐钢铁联合有限责任公司制造部,河北 唐山 063200

北方工业大学机械与材料工程学院,北京 100144

首钢京唐钢铁联合有限责任公司钢轧作业部,河北 唐山 063200

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多模式连铸连轧 低碳铝镇静钢 高拉速 夹杂物 凝固前沿

国家重点研发计划资助项目国家重点研发计划资助项目国家自然科学基金资助项目国家自然科学基金资助项目中央高校基本科研业务费资助项目

2023YFB37099002023YFB370990352174293U22A20171FRF-BD-20-04A

2024

10.13228/j.boyuan.issn0449-749x.20230719

钢铁
中国金属学会钢铁研究总院

钢铁

CSTPCD北大核心
影响因子：1.204
ISSN：0449-749X
年,卷(期)：2024.59(8)