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支架柱窝ZFS550是采用27SiMn材质的铸钢件,在生产过程中发现毛坯的冒口处局部有严重增碳现象,多达0.4%C,这种现象是极其少有的。经过对实际生产过程的观察与分析,我们发现局部增碳的原因主要有以下两个方面:(1)铸件在浇注过程中使用了覆盖剂,且在加了覆盖剂后又进行了补浇,这样
Scaffold column nest ZFS550 is made of 27SiMn steel castings, found in the production process of rough riser at the local serious carbon phenomenon, up to 0.4% C, this phenomenon is extremely rare. After the observation and analysis of the actual production process, we found that the reasons for the local carbonation mainly in the following two aspects: (1) castings in the casting process using a covering agent, and after adding a covering agent and then make up the pouring, such