Chromium-containing metal and manufacturing method thereof

A chromium-containing metal manufactured through a method comprising the steps of:

• reducing a chromium oxide with silicon by heating and melting, in an arc melting furnace, the chromium oxide with sufficient silicon to obtain a primary slag and a molten metal containing at least 85 mass % chromium and more than 0.2 mass % and less than 1.0 mass % silicon;
• then, discharging the primary slag from the arc melting furnace;
• adding, after discharge of the primary slag, a basic flux into the arc melting furnace to melt the basic flux by electric arc to obtain a secondary slag;
• refining the molten metal containing at least 85 mass % chromium and silicon by contacting the secondary slag with said molten metal to form a refined molten metal with a silicon content which is reduced to below 0.1 mass %:
• and then, tapping the refined molten metal from the arc melting furnace and casting the refined molten metal to form cast chromium-containing metal.

A chromium-containing metal, comprising at least 85 mass % chromium, up to 0.005 mass % aluminum, up to 0.1 mass % silicon, up to 0.002 mass % sulfur, and up to 0.005 mass % nitrogen, manufactured through a method comprising the steps of:

• reducing a chromium oxide with silicon by heating and melting, in an arc melting furnace, the chromium oxide with sufficient silicon to obtain a primary slag and a molten metal containing at least 85 mass % chromium and more than 0.2 mass % and less than 1.0 mass % silicon;
• then, discharging the primary slag from the arc melting furnace;
• adding, after discharge of the primary slag, a basic flux into the arc melting furnace to melt the basic flux by electric arc to obtain a secondary slag;
• refining the molten metal containing at least 85 mass % chromium and silicon by contacting the secondary slag with said molten metal to form a refined molten metal with a silicon content which is reduced to below 0.1 mass %;
• tapping the refined molten metal from the arc melting furnace and casting the refined molten metal to form cast chromium-containing metal;
• and then, the cast chromium-containing metal is crushed, and the crushed chromium-containing metal is subjected to a vacuum heating treatment.

A chromium-containing metal, comprising at least 85 mass % chromium, up to 0.005 mass % aluminum, up to 0.1 mass % silicon, up to 0.002 mass % sulfur, and up to 0.005 mass % nitrogen, manufactured through a method comprising the steps of:

• reducing a chromium oxide with silicon by heating and melting, in an arc melting furnace, the chromium oxide with sufficient silicon to obtain a primary slag and a molten metal containing at least 85 mass % chromium and more than 0.2 mass % and less than 1.0 mass % silicon;
• then, discharging the primary slag from the arc melting furnace;
• adding, after discharge of the primary slag, a basic flux into the arc melting furnace to melt the basic flux by electric arc to obtain a secondary slag;
• refining the molten metal containing at least 85 mass % chromium and silicon by contacting the secondary slag with said molten metal to form a refined molten metal with a silicon content which is reduced to below 0.1 mass %;
• tapping the refined molten metal from the arc melting furnace and casting the refined molten metal to form cast chromium-containing metal;
• the cast chromium-containing metal is crushed;
• the crushed chromium-containing metal is formed into briquettes;
• and then, the resultant briquettes are subjected to a vacuum heating treatment.