铸钢件裂纹与钢中夹杂物关系及减少措施

钢中夹杂物是铸钢裂纹产生的主要原因,同时对钢的质量和力学性能等有很大影响,必须严格控制.外来夹杂物可以根据其来源采取相应措施加以去除,而内生夹杂物却需通过脱氧工艺及钙处理工艺新技术加以控制.在冶炼过程中,要加强时脱氧、脱硫、去夹杂物、去气体等冶炼操作,并在炉后钢包内采取必要的措施,如加稀土进行变质处理等来改变夹杂物的形状,减少夹杂物,以降低铸钢裂纹倾向.

Research on the Relationship between the Cracking and Inclusion in the Cast Steel and Decreasing Measure

Impurities in the steel is the most important factor that causes cracking in the cast steel.At the same time,it has great effect on the quality and mechanics performance of the steel,so it should be controlled strictly.Exterior impurities can be removed with corresponding measures according to their sources,but endogenic impurities can be controlled through the new technology such as deoxidation and Ca treatment process.In the process of smelting,we should strengthen the smelting operation,such as deoxidation,desulphurization, impurities removing,gas removing and so on,to reduce the impurities.The essential measures should be taken(such as deterioration treatment by adding rare earth elements to change the form of the inclusion) to reduce the inclusion and the cracking in the iron steel.