1·The results showed that the major cause of reducing diameter was more non-metallic inclusion in the steel than standard value, billet segregation and shrinkage void.
用扫描电镜、大型金相显微镜观察分析高碳钢盘条的缩径，结果表明：造成缩径的主要原因是盘条中的非金属夹杂物超标、方坯偏析和缩孔。
2·To simulate wire drawing process conditions of consumers, the ER70S-6 high speed wire rod for welding wire, which is rolled with shrinkage void square billet at center, is drawn.
模拟用户的拉丝工艺条件，对中心缩孔方坯轧制的ER70S - 6焊丝用高线盘条进行拉拔试验。