A HIGH CHROMIUM-VANADIUM CAST IRON MATERIAL FOR TUBE MILL LINERS AND SIMILAR APPLICATIONS

摘要

A high chromium-vanadium cast iron material, composition of which has C: 2.4wt%- 2.8wt%, Si: 1wt% Max., Mn: 0.5wt% - 1.5wt%, Ni: 0.5wt% Max., Mo: 0.6wt% Max., S: 0.06wt% Max., P: 0.06wt% Max., Cr: 22wt%-28wt%, Cu: 1wt% Max., V: 0.35wt% - 0.65wt%, and the balance being Fe. The above new material was casted using induction melting and sand casting methods and then was heat treated to hardened and tempered conditions. Subsequent to this, the casting was subjected to Radiographic Testing (RT), characterization, hardness measurement, impact testing and abrasion wear testing. Through RT, the castings was qualified as Class-I. The casting was found to have a stable microstructure with uniform discontinuous carbides precipitations, a very good combination of impact toughness (40 to 60J/cm2) and hardness values (57 to 62HRC) and a higher abrasion wear resistance (wear loss of 8.0 to 13.0 mg/minute). This invention may be used in tube mill liners and similar other parts experiencing the similar service conditions for achieving a higher service life.