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Influence of addition of briquettes with dust content into the charge of electric induction furnace on cast iron quality

100%

Pribulová A. , Futáš P. , Baricová D.

tom Vol. 12, iss. 3

95-98

Foundry dust from blasting and grinding of castings contain a high amount of iron, ergo it is possible its recycling in foundry process. Dust was compacted by briquetting, two kinds of briquettes were prepared (A contained 95% magnetic part of dust from casting blasting +5% bentonite and B contained 95% mixture of dust from casting grinding and magnetic part of dust from casting blasting + 5% bentonite) and used as a part of charge into the electric induction furnace. It was found that addition of briquettes has had an influence of a chemical composition of cast iron above all on content of sulphur, phosphorus and silicon. It was not reflected in decrease in tensile strength and in microstructure. Yield of metal from briquettes was not lower then 70%.

Effect of melting technology on the properties of G17CrMo5-5 steel for cast turbines

100%

Mańkowski P. , Kalandyk B. , Zapała R.

tom Vol. 10, iss. 4

133--136

Two technologies of the G17CrMo 5-5 cast steel melting were compared, i.e. the so far used oxygen-recovery melting technology (electric arc furnace + ladle furnace – EAF + LF) and a new recovery melting technology (electric induction furnace + ladle furnace - EIF + LF). The effect of the melting technology on the properties of cast steel for turbine parts was determined. The cast steel was evaluated in term of its metallurgical purity and mechanical properties. During melting of G17CrMo 5-5 steel in induction furnace, lower total content of oxygen in casting was reached, but nitrogen content was higher than it was in the cast steel from arc furnace. Metal refining in LF improved the steel desulphurising degree and contributed to modification of the non-metallic inclusions.