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AssigneesJfe Steel Corporation, JFE Material Co., Ltd.
InventorsHiroiti Sugimori, Chitoshi Matsumura, Satoaki Kawaguchi, Masanori Kato
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A metal having a high chromium content, characterized in that it is produced in an arc melting furnace and contains Cr in an amount of 85% or more and has an Al content of 0.005% or less, an Si content of 0.1% or less and an S content of 0.002% or less; and a method for producing the metal having a high chromium content which comprises reducing a chromium oxide heated and melted in an arc melting furnace with Si, to thereby prepare a metal melt containing 85% or more of CR, discharging a slag formed by the reduction with Si from the arc melting furnace, adding a fresh basic flux into the arc melting furnace, melting the basic flux with arc, to bring a slag formed by the melting of the basic flux to contact with the above metal melt and thereby refine the metal melt, and then taking out the refined metal melt from the arc melting furnace, followed by casting.
A manufacturing method of a chromium-containing metal, comprising:
A manufacturing method of a chromium-containing metal, comprising the steps of:
A chromium-containing metal, manufactured in an arc melting furnace, comprising at least 85 mass % chromium, up to 0.005 mass % aluminum, up to 0.1 mass % silicon, and up to 0.002 mass % sulfur.
A chromium-containing metal, manufactured in a combination of an arc melting furnace and a vacuum treatment equipment, 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.
A manufacturing method of a chromium-containing metal, comprising the steps of using, as a raw material, a chromium-containing metal containing at least 85 mass % chromium, at least 0.005 mass % aluminum, or at least 0.1 mass % silicon, or at least 0.002 mass % sulfur, adding a basic flux to this raw material, and melting and refining the same in a melting furnace.
A chromium-containing metal manufactured by using, as a raw material, a chromium-containing metal comprising at least 85 mass % chromium, at least 0.005 mass % aluminum, or at least 0.1 mass % silicon, or at least 0.002 mass % sulfur, adding a basic flux to this raw material, and melting and refining the same in a melting furnace, comprising at least 85 mass % chromium, up to 0.005 mass % aluminum, up to 0.1 mass % silicon, and up to 0.002 mass % sulfur.
Dependencies are inferred from the claim text.