原始钢锭中含有不可避免的凝固缺陷，并且在核电等大型锻件中，其内部微观组织晶粒度是影响其高韧性能的关键因素。
There are many inevitable defects in raw ingots. And the microstructure is the key factor which affects the high ductility of heavy forgings such as in nuclear power plant.
采用本工艺可以生产出成分合格，结晶组织优良，内部纯净的钢锭，为锻造创造良好的条件。
The steel ingot with qualified components, a good crystalline structure and pure interior can be produced by using the process which provides a good condition for smithing.
优点：可以破坏钢锭的铸造组织，细化钢材的晶粒，并消除显微组织的缺陷，从而使钢材组织密实，力学性能得到改善。
Advantages: it can destroy the ingot casting, steel grain refinement, and eliminating the defect in microstructure, thus making steel tissue close-grained, with improved mechanical properties.
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