According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”，“mountained”.
不含有非金属夹
囊表面
陷；由泡产生“雨点”状表面陷；“鱼鳞”状表面陷；“山水画”状表面陷。
,多山According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”，“mountained”.
不含有非金属夹囊表面陷；由泡产生“雨点”状表面陷；“鱼鳞”状表面陷；“山水画”状表面陷。
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