Casting steel strip
OwnerWalter N. Blejde, Rama Ballav Mahapatra +1inventors
InventorsWalter N. Blejde, Rama Ballav Mahapatra, Lazar Strezov
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Abstract
A method of producing strip comprising the steps of assembling a pair of casting rolls with a nip between them, introducing between the casting rolls to form a casting pool of molten carbon steel having a total oxygen content of at least 100 ppm and usually less than 250 ppm, counter rotating the casting rolls, solidifying the molten steel on the rolls to form metal shells with levels of oxide inclusions reflected by the total oxygen content of the molten steel, and forming thin steel strip through the nip between the casting rolls from the solidified shells. A unique steel strip may be obtained using the method having ductile properties.
Claims20
A method of making a steel strip by continuous casting comprising the steps of:
- a. assembling a pair of cooled casting rolls having a nip between them and with confining closures adjacent the ends of the nip;
- b. introducing molten low carbon steel having a total oxygen content of at least 100 ppm between the pair of casting rolls to form a casting pool between the casting rolls;
- c. counter rotating the casting rolls and solidifying the molten steel to form metal shells on the surfaces of the casting rolls with levels of oxide inclusions reflected by the total oxygen content of the molten steel to promote the formation of thin steel strip;
- and
- d. forming solidified thin steel strip through the nip between the casting rolls from said solidified shells.
A thin steel strip produced by twin roll casting to a thickness of less than 5 mm and formed of a solidified steel containing solidified oxide inclusions distributed such that surface regions of the strip to a depth of 2 microns from the surface contain such inclusions to a per unit area density of at least 120 inclusions/mm2.
The thin steel strip produced by twin roll casting to a thickness of less than 5 mm and formed of a solidified steel containing oxide inclusions distributed to reflect an oxygen content in the solidified steel in the range 100 ppm to 250 ppm.
Dependencies are inferred from the claim text.