大型船用高强度灰铸铁柴油机机体的生产

Production of high strength gray cast iron diesel engine block

介绍了某型船用灰铸铁柴油机机体的结构和技术要求。采用20 t中频感应电炉熔炼,60%废钢+10%生铁+30%回炉料配料,碳当量不小于3.7%,采用0.1%硅钡孕育进行炉内预处理孕育,0.5%硅钙钡孕育剂进行炉前冲入孕育,0.15%硅锰锆孕育剂浇注时随流孕育。树脂砂造型,三开箱底注半开放式浇注系统,型内保温不小于180 h,成功生产出在机体最厚大部位取样抗拉强度不小于170 MPa,布氏硬度不小于160,无铸造缺陷的大型船用灰铸铁柴油机机体。

Introduces the structure and technical requirement of gray cast iron engine block with a certain type of ship. With 20 tons of medium frequency induction furnace melting, 60% scrap ＋ 10% iron ＋ 30% recycled material ingredients, carbon equivalent not less than 3.7% with 0.1% silicon barium inoculation of furnace pre inoculation treatment, 0.5% calcium barium inoculation agent before furnace rushed into the incubation, 0.15% Si Mn Zr inoculant pouring with shed pregnant fertility. Resin sand molding, three open bottom note semi open gating system, type internal insulation is not less than 180 h, the successful production of in the thickest of the body parts of large sample tensile strength of not less than 170 MPa, Brinell hardness is not less than 160, no casting defects of large marine gray cast iron engine block.