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METHOD FOR PRODUCING CONTINUOUS CASTING ROUND SLAB FOR SEAMLESS STEEL PIPE PRODUCTION, AND METHOD FOR PRODUCING SEAMLESS STEEL PIPE
METHOD FOR PRODUCING CONTINUOUS CASTING ROUND SLAB FOR SEAMLESS STEEL PIPE PRODUCTION, AND METHOD FOR PRODUCING SEAMLESS STEEL PIPE
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机译:用于生产无缝钢管的连铸圆坯的方法及生产无缝钢管的方法
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摘要
PROBLEM TO BE SOLVED: To continuously cast a round slab of high Cr steel having a Cr content of 2.0-18.0 mass% while preventing an inner face flaw in time of pipe production.;SOLUTION: A method for producing continuous casting round slab uses a sectional circular mold 4 having a diameter on the inner face side ≤400 mm. A casting speed is 0.6-2.4 m/min. After a round slab 9 is perfectly coagulated at a surface temperature of 800-1,100°C, depression wherein a slab depression ratio RED is 10.0-30.0% is applied by one or more pinch rolls, and the round slab 9 is flattened such that the width dimension in the depression direction becomes smaller than the width dimension on a free face side in a direction orthogonal to the depression direction. The flattened slab is vertically depressed from the direction orthogonal to the vertically depressed direction by one or more shaping rolls to shape a section of the slab to a circular section having a prescribed dimension without flattening the slab.;COPYRIGHT: (C)2013,JPO&INPIT
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