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Casting steel strip

A technology for steel strips and casting rolls, which can be used in metal rolling and other directions to solve problems such as uneven cooling of steel strips.

Inactive Publication Date: 2007-04-11
CASTRIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was found that quenching of the strip resulted in uneven cooling of the strip due to the introduction of stress and other defects into the strip

Method used

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  • Casting steel strip
  • Casting steel strip
  • Casting steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The casting and rolling plant in Figures 1 to 7 comprises a twin roll caster indicated at 11 which produces a cast strip 12 via a transport path 10 through a guide table 13 to a pinch roll table 14 . After leaving the pinch roll table 14, the strip passes through a hot rolling mill 16 where it is hot rolled to reduce its thickness. The rolled strip leaves the rolling mill, passes an run-out table 17 where it can be forced cooled by fine mist from water spray pipes 18 , and then reaches a coiler 19 .

[0043] Twin roll casting machine 11 includes a main frame 21 supporting a pair of parallel casting rolls 22 having casting surfaces 22A. During a casting operation, molten metal passes from a ladle through a refractory ladle outlet pipe 24 to a tundish 25 and thereafter through a metal delivery nozzle 26 above a nip 27 between casting rolls 22 . The molten metal so conveyed forms the casting pool 30 supported by the casting surfaces 22A of the casting rolls 22 . The cast...

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PUM

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Abstract

Roll caster (11) produces thin steel strip (12) formed on casting surfaces (22A) of casting roll (22) that passes through first enclosure (37) adjacent casting roll surfaces (22A) and, optionally, thereafter second enclosure (61). Enclosure (37) and / or enclosure (61) may be fitted with spray nozzles (71,72) and / or (67, 68) operable to spray fine water mist adjacent strip (12) to produce hydrogen gas in enclosure (37) while tending to avoid liquid water contact with steel strip (12) and casting surfaces (22A). If hydrogen gas is produced only in enclosure (61), the two enclosures (37, 61) are interconnected so that gas can flow from enclosure (61) to enclosure (37). Enclosure (37) and, if present, enclosure (61) are sealed to maintain positive pressure and oxygen levels less than the surrounding atmosphere, and with the presence of hydrogen gas, reduce formation of scale on the strip in enclosure (37) and, if present, enclosure (61).

Description

technical field [0001] The present invention relates to the continuous casting of steel strip in a steel strip caster, especially a twin roll caster. Background technique [0002] In a twin-roll caster, molten metal is introduced between a pair of counter-rotating, internally cooled, horizontal casting rolls so that the metal shell solidifies on the moving roll surfaces and collects in the nip between them, creating a cast from the nip. The solidified steel strip product is conveyed downward. Herein, the word "nip" is used to denote the total area of ​​casting rolls that are closest together. Molten metal can flow from a ladle into a smaller vessel from which it flows through a metal delivery nozzle located above the nip, forming a rim above the nip that rests on the casting surface of each roll and extends the length of the nip. A casting pool of molten metal. Although alternatives such as electromagnetic baffles have been proposed, the casting pool is generally confined...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/06B21B1/46B22D11/106B22D11/12B22D11/124
CPCB22D11/0622B22D11/0697B22D11/1287B22D11/16B22D15/005
Inventor 沃尔特·N·布莱杰德安德鲁·格卢茨
Owner CASTRIP