【摘要】 在采用65%皮钢屑,余为废钢和回炉料,不用新生铁且不加合金元素的条件下,以碳硅及钢屑为孕育剂,严格控制熔炼及孕育处理工艺,制得了切削性能优良的高强度合成铸铁.当其CE为4.18~4.2%时,б_b平均可达250MPa.用该铁水浇注加工面最小壁厚仅3毫米的深井泵叶轮,共叶片墙都无白口;可在铸态下切削加工.更多还原

【Abstract】 The high-strength synthetical cast iron having good machinability has been produced by strictly controlling the melting and inoculation technology and by inoculating with C-Si and steel turning inoculant under the condition of using the charge materials consisting of 65% steel turning and 35% steel scrap and returns without addition of pig iron and alloys. When the carbon equivalent is 4.16~4.2%, the average tensile strength of this iron of up to 250 MPa can be obtained. The pump rotor with minimum wall -thickness of 3mm was produced without chilling end. The rotors can be machined at as-cast state. In this paper, the production technique, the mic-rostructure, mechanical properties and the test method for determining whether the chill present in the location of 3mm wall thickness or not by observing the microstructure of metallographic specimens cut from the test bars were given.更多还原