Continuous stream treatment of ductile iron

Details Continuous stream treatment of ductile iron Continuous stream treatment of ductile iron

C - Chemistry, Metallurgy

22

C

39/104, 53/75

C22C 33/08 (2006.01) C21C 1/10 (2006.01) C22C 33/00 (2006.01)

Patent

CA 1076813

ABSTRACT OF THE DISCLOSURE A method and apparatus for producing modified grey iron, and particularly nodular cast iron, is disclosed. The apparatus comprises refractory elements including an inclined flow course for continuous reception of molten grey iron, a V-shaped inclined receptacle interposed in said course into which a predetermined supply of modifying agent, such as mag- nesium, is injected to react with said iron, and means for controlling the egress of iron from the receptacle in order to sequentially stage the build-up and dissipation of a pool of iron is said receptacle facilitating chemical reactions and thorough mixing for attaining and improving the homogeneity of the modified iron elements. The product and composition uniquely is characterized by about 3.5 carbon, by weight, 2.5% silicon, .2 - .9 Mn sulfur no greater than .015%, the remainder being essentially iron; the composition is devoid of carbide and dross or slag and has a graphite nodule count of at least 400 per square millimeter in a 1/2 inch section.

244847

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