Improvement of the initial stage of solidification by using mild cooling mold powder
Improvement of the initial stage of solidification by using mild cooling mold powder
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DOI：
10.2355/isijinternational.37.134
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发表时间：
1997-01-01
影响因子：
1.8
通讯作者：
Hiraki, S
中科院分区：
文献类型：
--
作者：
Kawamoto, M;Tsukaguchi, Y;Hiraki, S
连铸凝固的初始阶段对优化钢的表面质量非常重要。众所周知，次包埋钢由于δ-> γ转变导致的收缩而具有纵向开裂的问题。速度范围为4-5 m/min的高速连续铸造也存在同样的问题。对于圆形坯件复活节，结晶器横截面的形状对于纵向开裂是不利的。为了改善高速连铸板坯和圆坯的表面质量，研制了缓冷保护渣。研究结果表明：1）高CaO/SiO2比、高凝固温度的保护渣最适合于连铸板坯连铸。2)低CaO/SiO2比、高凝固温度的保护渣最适合圆坯连铸。3)液体粉末薄膜的辐射效应大于固体粉末薄膜。
The initial stage of solidification for continuous casting is very important in optimising the surface quality of steel. It is well known that hypo-peritectic steel has problems with longitudinal cracking due to shrinkage resulting from the delta-->gamma transformation. High speed continuous casting, with a speed range of 4-5 m/min, suffers from the same problem. For a round-shaped billet easter, the shape of the mold cross section is at a disadvantage with regard to longitudinal cracking. In this study, mild cooling mold powders were developed in order to improve the surface quality of high speed casting slabs and round-billets. The results can be summarized as follows; 1) High CaO/SiO2 ratio mold powder with a high solidification temperature is most suitable for a slab easter. 2) Low CaO/SiO2 ratio mold powder with a high solidification temperature is most suitable for a round billet easter. 3) The effect of radiation in liquid powder film is bigger than solid powder film.