我厂生产的硼铸铁气缸套一直采用75硅铁进行孕育。由于其加入量较大,孕育效果较差,易产生白口,缸套硬度高,给机加工带来困难,有时机械强度亦达不到HT 250的要求。为此,通过实验而改用硅钡复合孕育剂取得了较好的效果。1 实验条件用3t/h冲天炉熔炼,卧式悬壁式离心机浇注。铁水成分要求为(wt%):2.9～3.2C,2.0～2.6Si,0.8～ I plant boron cast iron cylinder liner has been used 75 ferrosilicon breeding. Because of its large amount of incorporation, less effective inoculation, easy to produce white, cylinder liner hardness, machining difficulties, and sometimes the mechanical strength of less than HT 250 requirements. To this end, through the experiment and switch to silicon barium compound inoculant achieved good results. 1 Experimental conditions 3t / h cupola melting, horizontal hanging centrifugal centrifuge casting. Hot metal composition requirements (wt%): 2.9 ~ 3.2C, 2.0 ~ 2.6Si, 0.8 ~