Method of producing steel products having excellent internal quality
AssigneeJfe Steel Corporation
InventorsTatsuro Katsumura, Takaaki Iguchi, Rinya Kojo, Koji Hara
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Abstract
A method of producing a steel product having an excellent internal quality including subjecting a steel raw material of a round section to rolling at 3 or more passes to form a steel product of round section, wherein the rolling is conducted with a pair of upper and lower flat rolls at first pass, a pair of upper and lower same or different caliber rolls at second or more passes until just before a last pass, and a pair of upper and lower round caliber rolls at the last pass, under a condition that an area reduction in the first pass is within a range of less than a total area reduction from the raw material to the product.
Claims3
1-2. (canceled)
A method of producing a steel product having an excellent internal quality comprising subjecting a steel raw material of a round section to rolling at 3 or more passes to form a steel product of round section, wherein the rolling is conducted with a pair of upper and lower flat rolls at first pass, a pair of upper and lower same or different caliber rolls at second or more passes until just before a last pass, and a pair of upper and lower round caliber rolls at the last pass, under a condition that an area reduction in the first pass is within a range of less than a total area reduction from the raw material to the product.
Dependencies are inferred from the claim text.