高磷闸瓦铁素体控制的探讨

Study on Controlling Ferrite Proportion of High Phosphorus Brake-Shoe

研究了列车制动用高磷闸瓦铁素体含量的各种影响因素。结果表明,铁水出炉温度≥1350℃,用0.3%硅铁粒+0.2%锰铁粒+0.3%磷铁粒复合孕育效果最好;铁素体含量的合格率达到了90%,耐压检验和磷共晶偏析等不合格问题也得到了有效控制,显著的提高了产品质量。

The various Influence factors for controlling ferrite content in the train high phosphorus brake-shoe were studied. The results show that the best quality will be achieved by controlling the casting temperature （≥ 1 350℃） and adding compound inoculant （0.3%Si-Fe ＋ 0.2%Mn-Fe ＋ 0.3%P-Fe）. The qualification rate of train brake-shoe reaches 90% by checking ferrite content, the found questions in the pressure test and phosphorus eutectic segregation test are controlled. The quality of train brake improves greatly.