富坚ĐƯỜNGONG

凸缘的制造工艺中主要分为锻增值税đúc，切割及压延。　　The casting and forging flanges have advantages that the blanks of them have accurate shape，尺寸和成本低，只需要简单的过程。但是，锻造法兰有制造缺陷，如气孔王大夫螺母，等并没有很流畅的内部组织流线型。锻造法兰的明显好处是，他们可以在各种形状伪造，他们有低成本。　　Forging flanges generally have lower carbon content than the casting flanges and are not easy to rust。他们有流畅的流线，统一内部[...]

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