大口径锻造法兰优点

Advantages of large diameter forging flanges

1.大口径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。铸件的优点在于可以搞出比较复杂的外形，成本比较低。

1. large diameter forging flanges are generally less rust than cast flanges with low carbon content. The forging parts have good streamline, compact structure and better mechanical properties than cast flanges. The advantage of the casting is that it can make a more complex shape, and the cost is low.

2.锻造工艺过程一般由以下工序组成，即选取优质钢坯下料、加热、成形、锻后冷却。锻造的工艺方法有自由锻、模锻和胎膜锻。生产时，按锻件质量的大小，生产批量的多少选择不同的锻造方法

2. the forging process is usually made up of the following procedures, that is, to select high quality billet blanking, heating, forming, and forging after cooling. The forging process includes free forging, die forging and fetal membrane forging. In production, according to the quality of the forgings, how many different forging methods are selected for the production batch

3.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）；

3., the flange produced by casting is accurate in shape and size, small in processing and low in cost, but there are casting defects (pores, cracks, inclusions). The internal flow pattern of the casting is poor (if it's cutting parts, the streamline is even worse).

4.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；

4. forged flanges are generally less rust than cast flanges with low carbon content. Forging parts are streamlined, microstructure is more compact and mechanical properties are better than cast flanges.

5.锻造工艺不当也会出现晶粒大或不均，硬化裂纹现象，锻造成本高于铸造法兰。

5. improper forging process can also produce large or uneven grain and harden cracks, and the cost of forging is higher than that of cast flange.

6.锻件比铸件能承受更高的剪切力和拉伸力。

The 6. forgings can bear higher shear and tensile force than the castings.

7.铸件的优点在于可以搞出比较复杂的外形，成本比较低；

7. the advantage of the casting is that it can make a more complex shape, and the cost is low.

8.锻件优点在于内部组织均匀，不存在铸件中的气孔，夹杂等有害缺陷。

The advantage of the 8. forgings is that the internal organization is uniform, and there are no harmful defects such as the blowholes and inclusions in the castings.