大型厂为解决22号工字钢成品腿短、腿根折叠及腿外侧不平的缺陷,采用七道斜轧孔型系统及改进成品孔的开口位置,至7月份先后试轧两批,效果良好,一级品率由原来的89%提高到93%以上,小时产量也有所提高。改斜轧七道次以前,22号工字钢是由20号异型坯轧9道次成材,道次分配 In order to solve the shortcoming of the finished product of No. 22 I-beam, the large-sized factory adopted the seven oblique-hole system and improved the opening position of the finished hole, A product rate increased from 89% to 93% or more, the hour output also increased. Change the slash rolling seven times before the 22 I-beam from the No. 20 profiled rolled 9 times into the timber, pass allocation