High-boron high-speed steel roll materials used
50 kg alkaline medium-frequency induction furnace
melting. High-speed steel scrap, steel scrap, pig iron,
ferromolybdenum, ferrotungsten, ferrovanadium,
ferrochrome and ferroboron were used to make-up
of charge. Ferrochrome is added after the molten
steel melt is cleared, and ferrovanadium and
ferroboron are added before tapping. Liquid steel
tapping temperature is 1530
–
1560 °C. Pouring tem-
perature is 1460
–
1480 °C. With sand casting shap-
ing, casting into 20 mm × 20 mm × 120 mm speci-
men. Then using wire cutting machine directly take
into 20 mm × 20 mm × 20 mm specimens and
10 mm × 10 mm × 55 mm specimens, and conduct-
ed microstructure observation and mechanical prop-
erties test, respectively. Specific compositions of the
specimen are shown in Table 1.