从1957年4月起,鞍钢曾在初轧机轧制钢3沸腾钢中板坯时,发现板坯上起鼓包的现象,在生产中叫作“气囊”。气囊的位置都相当于钢锭的头部。仔细的检查证明,在一部份未发现气囊的头部板坯的横断面上,特别是在氧气-乙炔切断的横断面上,也可以看出有分层现象,就是说在板坯厚度的中线附近有或长或短的、形状不规则的缝(图1),宽度大多在1mm以下,但也有较宽的,直到形成明显的气囊。这些缺陷都发生在正常的板坯切 Since April 1957, Ansteel Iron and Steel has been in the early rolling mill steel 3 boiling steel slab, slab found on the drum package phenomenon, in production called “airbag.” The position of the balloon is equivalent to the ingot head. Careful examination proved that there was also a delamination on the cross-section of the head slab where no airbag was found, especially on the oxygen-acetylene cut-off, that is to say at the slab thickness Near the midline there are long or short, irregularly shaped seams (Figure 1), most of which are under 1 mm in width, but also wider until a noticeable balloon is formed. These defects occur in the normal slab cut