Surface Cracks on Horizontal Continuous Casting Billets Produced with Recycled Copper Scrap

Chen Shuying; Yue Xudong; Chang Guowei

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Surface Cracks on Horizontal Continuous Casting Billets Produced with Recycled Copper Scrap
Vol. 31, Issue 4, Pages: 353-356(2011)
Published： 2011 ，
DOI：

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[1]陈淑英,岳旭东,常国威.废杂铜再生黄铜水平连铸坯的表面裂纹[J].特种铸造及有色合金,2011,31(04):353-356+397-398.

Chen Shuying, Yue Xudong, Chang Guowei. Surface Cracks on Horizontal Continuous Casting Billets Produced with Recycled Copper Scrap. [J]. Special Casting & Nonferrous Alloys 31(4):353-356(2011)
[1]陈淑英,岳旭东,常国威.废杂铜再生黄铜水平连铸坯的表面裂纹[J].特种铸造及有色合金,2011,31(04):353-356+397-398. DOI：

Chen Shuying, Yue Xudong, Chang Guowei. Surface Cracks on Horizontal Continuous Casting Billets Produced with Recycled Copper Scrap. [J]. Special Casting & Nonferrous Alloys 31(4):353-356(2011) DOI：

摘要

对以废杂铜为原材料生产的水平连铸黄铜铸坯的表面裂纹及其形成机理进行了研究。结果表明

随着铸坯直径的减小

铸坯表面裂纹增多。表面裂纹大多位于铸坯的上部

且大部分裂纹的深度在0.3～0.5mm之间

最深处可达4mm。另外

大部分裂纹的尖端比较圆钝

只有少量裂纹尖端比较尖锐

并且裂纹尖端附近有晶间开裂的现象;裂纹内部有SiO2、Al2O3等夹杂物存在。从凝固的角度分析了铸坯形成表面裂纹的原因。分析认为

不正确的二冷方式是铸坯产生表面裂纹的主要原因。采用环形喷水器的二次冷却方式后

铸坯表面裂纹基本消失

铸坯表面质量得到显著改善。

Abstract

Surface crack and its formation mechanism of horizontal continuous casting billets produced with copper scrap were analyzed.With decreasing in diameters of the billets

surface crack which is mainly distributed into the upper of the billets is increased.The major crack with relatively round-obtuse tip and a little sharp tip are in range of 0.3～0.5 mm in depth

and the deepest crack reaches 4 mm

meanwhile

intergranular crack around crack tip can be observed.There exists inclusion including SiO2 and Al2O3 in crack.Formation mechanism of crack on the billets was analyzed based on solidification theory.It is believed that surface crack on the billets is mainly related to the incorrect secondary cooling process.Through using annular feed-water injector in secondary cooling process

surface crack is eliminated

improving greatly the quality of the billets.