铸造出来的法兰，毛坯形状尺寸准确，加工量小，成本低，但有铸造缺陷（气孔.裂纹.夹杂）；铸件内部组织流线型较差（如果是切削件，流线型更差）；

The flange produced by casting is accurate in shape and size, small in processing volume and low in cost, but with casting defects (pores, cracks, inclusions). The internal flow pattern of the casting is poor (if the cutting parts are of poor streamline type).