The results showed that the metallurgical defects such as inclusions, coarse crystal grains and asymmetry of the grain size were the main reason resulting in fracture of the steel rods during drawing.
结果表明，原材料中存在的夹杂物、晶粒粗大及混晶等冶金质量缺陷是盘条在拉拔过程中发生断裂的主要原因。
2
Crystal instrument is the key part of plane casting, the structure affects directly the surface quality of drawing material.
结晶器是水平连铸工艺中的关键工装部件，其结构直接影响拉拔管材的表面质量。
3
The crystallinity of LDPE increased firstly and decreased later and the crystal defects might increase as drawing rate increased.