Study On Production Of Compacted Graphite Iron With The Cored Wire Technology

This paper brings forward a study task,which traditional production process of the compacted graphite iron,found it is difficult to produce stably it,because the very small remenants extention of Mg and Re , smoke and arc light.The cored wire technique can control the Mg and Re in a small remenants extention and the cored wire station can cancel the smoke and arc light in produce the nodular cast iron,made it is the best method to produce compacted graphite iron.This paper research the mechanics of the compacted graphite and influence of the Mg cored wire and Re cored wire and coolint rate on the graphite in the cast iron,by adding CaC₂ to desulfer in the furnace and adding 75-Si-Fe cored wire to innoculant ,adding difference Mg and Re cored wire and trapezoid method.In 10 kg iron metal,adding 140g CaC₂ in the furnace andφ5mm 75-Si-Fe cored wire to innoculant ,adding difference Mg and Re cored wire and trapezoid method,made the metallographical phase.The result is:1. This method can produce the compacted graphite iron by addingφ5mm 75-Si-Fe cored wire to innoculant ,adding Mg and Re cored wire;2. Addingφ5mm 75-Si-Fe cored wire and Re cored wire in the ladal (Wt is 0.0273% and 0.125%,the length is 75mm and 440mm ) and adding different Mg cored wire (wt is 0.0225% 0.025%, the length is 180²00mm ) can make the Vermicular Graphite Percentage above 65%.Belew this extention the graphite tend to flake graphite ,above extention the graphite tend to spheroidal graphite;3. Addingφ5mm 75-Si-Fe cored wire and Mg cored wire in the ladal (Wt is 0.025% and 0.125%,the length is 200mm and 440mm ) and adding different Mg cored wire (Wt is 0.0%⁰.018%,the length is 0⁵0mm ).it is no influence on the graphite.4. Diametral of trapezoid in the ?10³5mm and the Vermicular Graphite Percentage is in the 15%⁹5% line change.The graphite first separate in spheroidal graphite,gradually grous campacted graphite because of the non-uniform of the Mg and Re.