The key to the production quality control of high-toughness ductile iron is to obtain a high ferrite content, a high nodularity, a small diameter and a large number of graphites in the structure of the casting. This is the basis for the high-toughness ductile iron's qualified mechanical properties. In order to obtain high toughness ductile iron, high-quality cast pig iron must be used to ensure it. In the past year, pig iron has been in short supply and prices have been increasing, which has caused the foundry to face a severe operating situation. In view of this problem, this article discusses the same nodulizing agent and inoculant for electric furnace smelting, without changing the nodulizing and inoculating treatment process, using crystalline graphite carburizer + industrial carbon waste iron + large amount of regrind to produce high added value and high performance The iron-synthetic cast iron process is more conducive to successfully obtaining qualified high-toughness ductile iron, and the production and management costs are low, which significantly improves the efficiency of the foundry.
Due to the rapid development of the iron and steel industry, pig iron resources are becoming increasingly scarce, high-quality pig iron is in short supply, and prices are rising. Available resources will continue to be tight, running at a high level, and the trend of rising labor costs continues to form. It can be concluded that an era of casting high costs is coming. Enterprises with high energy consumption and high pollution emissions and producing low value-added castings will be eliminated first. The application of electric furnace synthetic cast iron technology to improve the quality of castings, reduce the cost of casting, and improve the efficiency of the foundry has become the basis for the development of casting enterprises.
The key to smelting synthetic cast iron by electric furnace is the selection and addition of carburizing agent, Mn adjusting slag making auxiliary material, industrial carbon waste iron, and smelting quality control. The use of carburizing agent to increase carbon content, adjust chemical composition, and improve the structure and performance of cast iron ; Use relatively inexpensive industrial carbon scrap iron. Reduce cost; in order to obtain better carbon replenishment effect, crystalline graphite recarburizer is used in production. Crystal graphite carburizing agent is mainly used for the production of high-toughness ductile iron castings (wind power ductile iron castings), obei ductile iron castings and large and complex gray cast iron and ductile iron diesel engine cylinders and cylinder heads; application of crystalline graphite carburizing agent + Scrap steel + large amount of regrind is a new technology to produce high value-added high-performance ductile iron castings at low cost.