球墨铸铁件夹渣缺陷改进

Improvement of Slag Inclusion Defect of Nodular Cast Iron

在铸造过程中,由于原材料和过程控制等的不稳定因素,造成球墨铸铁铸件在浇注中容易产生夹渣缺陷,从而导致球墨铸铁件尺寸、UT、MT不合格等问题。针对该问题,对球墨铸铁件中夹渣的形成原因进行了分析,并根据分析结果提出了解决措施。通过调整化料顺序、延长过热保温时间、采用低氮低氧孕育剂等措施,夹渣缺陷问题得到了解决,使铸件的综合性能得到了有效改进。

In the production process of ductile iron castings,raw materials and process control and other unstable factors are easy to produce slag inclusion defects,which leads to the size,UT,MT unqualified problems.In this paper,the causes of slag inclusion in nodular cast iron are analyzed,and the solutions are put forward.The slag inclusion problem was solved by adjusting the charging sequence,extending the time of superheating and holding,and adopting low nitrogen and low oxygen inoculant,so that the comprehensive properties of the castings were effectively improved.