Method for improving internal quality of continuous casting and submerged nozzle for implementing method

An internal quality, immersion technology, used in casting equipment, casting melt containers, manufacturing tools, etc., can solve the problems of insignificant effect and limited addition, and achieve improved internal quality, reduced center segregation, and improved center porosity. The effect of shrinkage

CN102211154BActive Publication Date: 2013-10-30WISDRI ENG & RES INC LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-10-30

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Abstract

The invention relates to a method for improving the internal quality of a continuous casting and a submerged nozzle for implementing the method. The submerged nozzle mainly comprises a long-barrel flat annular body submerged nozzle body with the bottom sealed, two arc surfaces at the upper end of the bottom of the nozzle are provided with symmetrical side holes; the two opposite side surfaces and hollow surfaces respectively arranged at the periphery are connected in a closing way to form an integrated feeding guide pipe; each hollow surface is inclined downward and extends while a certain distance is kept with each side surface of the nozzle body, thus all the feeding guide pipe are communicated at the bottom and form an exit section at the bottom of the nozzle body. In a continuous casting process, granular or bead-like, piece-like and strap-like part steel or iron product is continuously fed from the feeding guide pipes of the submerged nozzle and creeps down to the center of a molten pool of a crystallizer, degree of superheat of molten steel can be reduced, the cooling speed at the center is increased, formation of a central isometric crystal is promoted, enrichment and segregation of solute element at the center of a cast blank are prevented, solidification structure at the center of the cast blank is effectively optimized, and the density at the center of the cast blank is strengthened.
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Description

technical field

[0001] The invention belongs to the technical field of continuous casting of steel, and mainly relates to measures for improving internal quality defects of continuous casting slabs and an accessory device. Background technique

[0002] Continuous casting of steel is a process in which molten steel continuously transfers and releases heat in a continuous state, and gradually solidifies into a billet of a certain shape. During the transformation process of steel from liquid to solid state, various surface and internal quality defects are always unavoidable due to the external thermal stress coupling effect and its own solidification shrinkage characteristics. With the continuous improvement of continuous casting technology and control level, the surface quality of the slab has been greatly improved, and those residual surface quality defects can also be removed by surface grinding. Therefore, the current development of continuous casting technology The most i...

Examples

Embodiment Construction

[0028] Attached below Figure 1-4 The method and apparatus of the present invention are further described.

[0029] Such as Figure 1-4 As shown, the submerged nozzle device adopted in the present invention mainly includes a nozzle body 2, and two side holes 3 symmetrical along the center line of the nozzle are opened on the bottom of the nozzle body 2. Feeding conduits 4 are arranged on the opposite parallel sides of the openings 3 on the nozzle body 2, and the feeding conduits 4 are integrated with the nozzle body 2, and its width is substantially equal to the width of the connected nozzle wall, and the shape can be Square, semicircular or flat.

[0030] For the convenience of adding materials, the hollow surfaces on each side of the feeding conduit 4 are at an inclination angle of 5°-60° to the vertical direction, and the distance between the opening of the feeding conduit 4 and the top surface of the crystallizer 1 is 200mm-600mm. The feeding conduits 4 on both sides of...