Quality and Quality Control of ContinuousCast Round as Tube Stock （Part Ⅱ）

Up to now there has been neither national standard nor the industrial standard as set for the continuous cast round as tube stock, and the manufacturers can only follow their own company technical criteria. Based on relevant testing and theoretical analyses, it is proposed that additional contents be put into the technical requirements for the said CC round involving such aspects as the surface fine grain area, the columnar grain area, thickness proportion of the equiaxed grain area and state of the core. Also proposed are the relevant control methods. Considering the importance of quality of the CC round as tube stock, it is hoped to work out a national standard for this field as soon as possible.