Twin-roll continuous casting method
AssigneeNippon Steel Corporation
InventorsYoshikazu Matsumura, Yoshio Morimoto, Kiyomi Shio, Yoshiyuki Ueshima, Toshiaki Mizoguchi, Satoshi Akamatsu, Shigeru Ogawa, Kazuo Koyama
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Abstract
A casting C obtained by solidification of molten metal by using a pair of water cooled casting rolls 2a, 2b is subjected to temperature adjustment in a temperature zone so that an austenite structure exists in its matrix. Thereafter, the casting is rolled by an in-line rolling mill 5 at a temperature ranging from 850.degree. C. to less than 1,350.degree. C. and at a reduction of 5 to 50%. In this way, overall variance of elongation of the steel material is kept within 5% in terms of the standard deviation.
Claims7
A twin-roll continuous casting method comprising:
- pouring a molten metal of carbon steel having a carbon content of 0.0005 to 1 wt % between a pair of water cooled casting rolls, thereby providing a solidified casting;
- regulating temperature of said solidified casting to a temperature range in which an austenite structure exists in the solidified casting matrix;
- feeding the solidified casting in an inert gas atmosphere into an in-line rolling mill;
- rolling the solidified casting in the in-line rolling mill to a predetermined thickness, said rolling being a one pass rolling with a reduction of 5 to 50% to provide a rolled steel sheet, said rolled steel sheet being an equivalent of a hot rolled steel sheet and having a surface roughness not greater than 20 .mu.m;
- taking up said rolled steel sheet by a coiler to provide a rolled steel sheet coil.
A twin-roll continuous casting method comprising:
- pouring a molten metal of carbon steel having a carbon content of 0.0005 to 1 wt % between a pair of water cooled casting rolls, thereby providing a solidified casting;
- providing an in-line rolling mill having an entry side downstream from an exit side of said pair of water cooled casting rolls;
- transferring said solidified casting from the exit side of said pair of water cooled casting rolls to the entry side of said in-line rolling mill in an inert gas atmosphere;
- regulating temperature of said solidified casting to a temperature range in which an austenite structure exists in the matrix of the solidified casting upon said solidified casting reaching the entry side of said in-line rolling mill;
- rolling the solidified casting in the in-line rolling mill to a predetermined thickness, said rolling being a one pass rolling with a reduction of 5 to 50% to provide a rolled steel sheet, said rolled steel sheet being an equivalent of a hot rolled steel sheet and having a surface roughness not greater than 20 .mu.m;
- taking up said rolled steel sheet by a coiler to provide a rolled steel sheet coil.
Dependencies are inferred from the claim text.