Process Control of Scrap Steel Carbonization Method of Smelting QT700-2
Author of the article: HUKechao1,3, CAO Kun2,3, ZHAO Ziwen2,3, SU Yixiang4
Author's Workplace：1. Casting and Forging Branch of Lanzhou LS Group, Lanzhou 730314, China; 2. Lanzhou LS Group Energy Equipment Engineering Institute Co., Ltd., Lanzhou 730314, China; 3. Gansu Engineering Research Center for High-end Forging and Casting, Lanzhou 730314, China; 4. School Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Key Words： scrap steel; recarburization; ductile cast iron
Abstract：
In order to reduce the cost of smelting, scrap steel was used as the main raw materials, cast iron and recycled
iron were used as auxiliary materials, and molten iron was smelted by medium frequency induction furnace, by controlling
the recarburizer, alloy element (Cu), inoculant (FeSi75) and nodularizer (FeSiMg8RE7) was used to adjust the chemical
composition and spheroidization effect to produce high-strength ductile cast iron. The results show that the tensile strength
of single casting samples of as-cast condition is ≥700 MPa, the elongation can reach 10% , the spheroidization grade is II,
the graphite size is more than VI, the pearlite content is ≥90%, and as-cast specimens have good mechanical properties.
Mass production can be realized, and no carbide, phosphorus eutectic, shrinkage cavity, crack, work hardening, etc.
