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）； 锻造法兰一般比铸造法兰含碳低不易生锈锻件流线型好，组织比较致密机械性能优于铸造法兰；
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