Investigation of technology practice and application on ductile cast iron production using machine scrap iron
By using low-grade ferrite-based gray iron scrap from machine scrap tool beds,through strict sorting and composition testing,combined with scrap steel,return scrap,nodulizer,inoculant and other additives,reasonable charging sequence and optimized medium frequency furnace melting process were selected to obtain ferrite-based ductile iron.Its average tensile strength is 458.6 MPa,yield strength is 336.5 MPa,Brinell hardness is 162.4 HBW,elongation reaches 14.1％,and impact toughness at room temperature is 11.2 J.The overall index is superior to the mechanical properties of QT450-10 as a national standard.The matrix structure is polygonal ferrite,and no pearli-te is observed.The ductile iron pipe fittings produced by melting machine scrap iron as raw materials meet the user's requirements.
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