SLAG FOR ELECTROSLAG REMELTING OF COPPOER ALLOYS AND PROCESS FOR MANUFACTURING COPPER ALLOY PRODUCTS

摘要

The invention aims to attain lowered S content and non-contamination with Al and thereby enable the manufacturing of a copper alloy which has excellent casting surface and internal properties and in which crystal grains are refined. A slag for electroslag remelting of copper alloys which has a composition comprising by mass CaF2: 20 to 45%, CaO: 10 to 30%, SiO2: 10 to 30%, LiF: 10 to 20%, ZrO2: 5 to 15%, and impurities: 1% or below and satisfying the relationship: 17.0(LiF content + ZrO2 content) - 556 = CaF2 content = 4.1 (LiF content + ZrO2 content) - 80.9 and a process for manufacturing copper alloys with the slag.