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首页> 外文会议>The 2nd International symposium on clean steel >Influencing Factors on Center Segregation in Continuously Cast Pipeline Steel Slabs
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Influencing Factors on Center Segregation in Continuously Cast Pipeline Steel Slabs

机译：连铸管线钢坯中心偏析的影响因素

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摘要

The factors which influence center segregation of continuously cast slabs are obtained through analyzing the database of macrostructrue. It indicates that center segregation becomes severer with the increasing content of carbon, phosphorus and sulfur; Center segregation will be reduced obviously if the content of manganese is higher than 1.5% and the ratio of Mn/S is higher than 300; High degree of superheat, high casting speed and increasing width of slabs will increase the degree of center segregation. Since center segregation below class B has little effect on the property of steel, hence, in order to low the ratio of center segregation of class B—1.0 down to 10%, several control strategies are presented as follows: the contents of carbon, phosphorus and sulfur must be focalized in lower range of steel grade demanded, but manganese upper operating range control. The referenced contents of the elements in molten steel are required like this: [C]<0.07%, [P]<0.01%, [S]<0.005%, [Mn]>1.5%, [Mn]/[S]>300; The degree of superheat should be lower than 24癈 and the casting speed should be defined to 1.0-1.1 m-min-1. At the same time, proper secondary cooling system of water distribution should be developed and the precision of continuous caster should be also improved.
机译：通过分析宏观结构数据库，得到影响连铸坯中心偏析的因素。表明随着碳，磷，硫含量的增加，中心偏析更加严重。锰含量大于1.5％，Mn / S比大于300时，中心偏析会明显降低。较高的过热度，较高的铸造速度和增加的板坯宽度将增加中心偏析的程度。由于B级以下的中心偏析对钢的性能影响很小，因此，为了将B级的中心偏析比率降低至1.0％至10％，提出了以下几种控制策略：碳，磷的含量硫必须集中在要求钢种的较低范围内，而锰应控制在较高的工作范围内。要求钢水中元素的参考含量如下：[C] <0.07％，[P] <0.01％，[S] <0.005％，[Mn]> 1.5％，[Mn] / [S]> 300;过热度应低于24癈，铸造速度应定义为1.0-1.1 m-min-1。同时，应发展适当的配水二次冷却系统，并应提高连铸机的精度。

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