Method for strengthening inoculation effect of grey cast iron

The invention provides a method for strengthening the inoculation effect of grey cast iron. Free primary carbide nucleates and grows in the initial state of liquid phase solidification, and the necessary condition of nucleation and growth of the free primary carbide is the requirement for the time, the concentration fluctuation environment and the energy fluctuation environment; in order to restrain nucleation and growth of the free primary carbide, the chromium content in the grey cast iron is increased in the method; in the iron liquid solidification process, high carbon chromium iron is added into molten iron through a pouring process, so that the free primary carbide caused by chromium has neither enough energy to nucleate nor enough growing time, accordingly, the purpose of restraining the free primary carbide is achieved, and the tensile strength of a casting is improved. 本发明提供了种强化灰口铸铁孕育效果的方法。游离的初晶碳化物是在液相凝固的初期形核与成长，它的形核与成长必要条件是需要时间、浓度起伏及能量起伏环境，为了抑制其形核及成长，本发明提高了灰口铸铁中铬含量，通过在铁液凝固过程中，将高碳铬铁以冲入法的工艺加入铁水中，使铬所致的