CN-122007380-A - Composite billet continuous casting device and continuous casting method

CN122007380ACN 122007380 ACN122007380 ACN 122007380ACN-122007380-A

Abstract

The application relates to the field of continuous casting, in particular to a composite billet continuous casting device and a continuous casting method. The continuous casting device for composite steel billet includes bearing frame, crystallizer, cooling system, width dynamic regulating mechanism, etc. the crystallizer has physical separator to separate flow channels, the cooling system can control the cooling strength of the flow channels independently, the width dynamic regulating mechanism can regulate the width ratio of the flow channels, and the continuous casting device is used to inject different molten steel into the independent flow channels and control cooling to make molten steel meet in solid-liquid state to realize metallurgical combination. The application can independently control the cooling intensity of each runner, adjust the width ratio of the runner and control the growth of the solidified blank shell, so that the two molten steels are metallurgically bonded in a solid-liquid state to form the composite steel billet with the gradient transition interface.

Inventors

Bai Cheligeer
LIU JIAN
BAO SHILEI
ZHANG JUNTING
ZHANG XIYAO
LIAO ZHENGJUN
ZHAO ZHENGZHENG
LIU XIAOJUN

Assignees

天津荣程联合钢铁集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. A composite billet continuous casting apparatus, comprising: a load-bearing frame (1); The crystallizer (2) is connected with the bearing frame (1), the vertical section of the crystallizer (2) is rectangular, a physical separator (4) is arranged in the crystallizer (2) to separate the position, close to the upper part, of the cavity of the crystallizer (2) into a first flow channel and a second flow channel along the length direction, and the tail ends of the first flow channel and the second flow channel are converged into a combined flow channel at the position, close to the lower part, of the cavity of the crystallizer (2); A cooling system (3), wherein the cooling system (3) comprises a first runner cooling system (3) and a second runner cooling system (3) which respectively correspond to the first runner and the second runner, and the first runner cooling system (3) and the second runner cooling system (3) are used for independently controlling the cooling intensity of the corresponding runners; And the width dynamic adjusting mechanism is used for driving the physical separator (4) to reciprocate along the length direction of the crystallizer (2) so as to adjust the width ratio of the first flow channel and the second flow channel to control the growth of the solidified shell.
2. The composite billet continuous casting device according to claim 1, wherein the physical separator (4) comprises a dividing part and a converging part, the dividing part is of a linear extending structure, the converging part is of an inward converging structure, the physical separator (4) comprises a first water cooling plate (401) and a second water cooling plate (402) which are symmetrically arranged, the first water cooling plate (401) and the second water cooling plate (402) both comprise straight parts arranged along the vertical direction and bending parts positioned at the bottoms of the straight parts, the two straight parts form the dividing part, the two bending parts form the converging part, and one side, away from the second water cooling plate (402), of the first water cooling plate (401) in the crystallizer (2) is the first runner.
3. The composite billet continuous casting device according to claim 2, wherein a copper plate (403) is arranged on one side, away from each other, of the first water cooling plate (401) and the second water cooling plate (402), a high-density corundum (404) is arranged at the bottom end of the converging portion, and the first water cooling plate (401) and the second water cooling plate (402) are fixedly connected through the high-density corundum (404).
4. The composite steel billet continuous casting apparatus according to claim 2, wherein, The crystallizer (2) adopts a modularized assembly structure, the crystallizer (2) comprises a first flow channel module (201) and a second flow channel module (202) which can be independently replaced, the vertical section shapes of the first flow channel module (201) and the second flow channel module (202) are C-shaped, The crystallizer comprises a crystallizer (2), wherein a first flow channel module (201) and a second flow channel module (202) are symmetrically arranged along the symmetry plane of the crystallizer (2) along the length direction, the first flow channel module (201) and the second flow channel module (202) are of a cavity structure, a first side cavity (2011) is formed in the first flow channel module (201), a second side cavity (2021) is formed in the second flow channel module (202), and the vertical section shapes of the first side cavity (2011) and the second side cavity (2021) are all of C type.
5. The composite billet continuous casting apparatus according to claim 4, wherein the first side cavity (2011), the second side cavity (2021), the first straight water-cooled plate and the second straight water-cooled plate are filled with heat exchange medium.
6. The composite billet continuous casting apparatus according to claim 4, wherein the first channel cooling system (3) comprises a first parallel fixed cooling water channel (301) provided in the first side cavity (2011), a first parallel linked cooling water channel (302) provided in the first straight water cooling plate, and a first flow control component for controlling flow in the first parallel fixed cooling water channel (301) and the first parallel linked cooling water channel (302), the second channel cooling system (3) comprises a second parallel fixed cooling water channel (303) provided in the second side cavity (2021), a second parallel fixed cooling water channel (304) provided in the second straight water cooling plate, and a second flow control component for controlling flow in the second parallel fixed cooling water channel (303) and the second parallel linked cooling water channel (304).
7. The composite billet continuous casting device according to claim 6, wherein the width dynamic adjusting mechanism comprises a servo hollow motor (5), a ball screw (6) and a screw, the servo hollow motor (5) is connected with the bearing frame (1), the servo hollow motor (5) is in driving connection with the screw so as to drive the screw to rotate around the axis direction of the screw, the screw is in threaded fit connection with the ball screw (6), the ball screw (6) is arranged along the horizontal direction and parallel to the length direction of the crystallizer (2), and two ends of the ball screw (6) are fixedly connected with the first water cooling plate (401) and the second water cooling plate (402) respectively.
8. The composite billet continuous casting device according to claim 7, further comprising a control system, wherein the control system comprises a processor, a temperature sensor group and a position sensor, the temperature sensor group comprises a plurality of sensors, the sensors are respectively arranged in the first side cavity (2011), the first water cooling plate (401) inner cavity, the second side cavity (2021) and the second water cooling plate (402) inner cavity, the position sensor is arranged in the crystallizer (2) and is positioned between the first water cooling plate (401) and the second water cooling plate (402), the position sensor is fixedly connected with the bearing frame (1), and the processor is in signal connection with the temperature sensor group, the position sensor, the first flow control assembly, the second flow control assembly and the servo hollow motor (5), and the processor is used for receiving signals of the temperature sensor group and the position sensor and sending a signal of the position sensor to the first flow control assembly, the second flow control assembly and the hollow servo control assembly (5).
9. A method for continuously casting a composite steel billet, which is applied to the continuous casting device of the composite steel billet as claimed in claims 1 to 8, and is characterized by comprising the following steps: injecting the first molten steel and the second molten steel into two independent runners respectively; by independently controlling the cooling intensity of each runner, each molten steel is initially solidified in each runner to form a primary solidified blank shell; Controlling the solidification process of the two molten steels so that at the end of the physical separator (4), the first molten steel is in a solid or semi-solid state, while the second molten steel remains in a liquid or semi-solid state, so that the two meet in a 'solid-liquid' state; in the continuous drawing process, the two metals meeting in a solid-liquid state are metallurgically bonded under pressure to form a composite billet with a gradient transition interface.
10. The continuous casting method of composite steel billets according to claim 9, wherein the casting superheat degree of the first molten steel and the second molten steel is in a low temperature range of 10-20 ℃, and the pulling speed and the cooling strength are cooperatively controlled to ensure that solidification fronts of the first molten steel and the second molten steel are converged at the same position.

Description

Composite billet continuous casting device and continuous casting method Technical Field The application relates to the technical field of continuous casting, in particular to a composite billet continuous casting device and a continuous casting method. Background The high-performance composite steel (such as stainless steel/carbon steel, high-strength steel/plain carbon steel composite blank) can take into account various performance advantages (such as corrosion resistance and strength, wear resistance and toughness), and has wide application prospects in the fields of energy chemical industry, transportation, high-end equipment manufacturing and the like. With the continuous increase of the requirements of the fields on the material performance, the market demand of the high-performance composite steel is growing, and the development of the high-performance composite steel has important significance for promoting the technical progress and product upgrading of related industries. Currently, in the technical field of metal material processing and continuous casting, in order to produce high-performance composite steel, a solid-phase composite method such as rolling composite and explosion composite is generally adopted. The rolling compounding is to combine different metal materials together in a rolling way, and the method can realize metal compounding to a certain extent, but the method needs a plurality of rolling procedures, and the production flow is relatively long. The explosion compounding is to combine two metal materials by utilizing the energy generated by the explosion of the explosive, and the method has higher requirements on equipment and operation environment and relatively higher cost. In addition, electromagnetic side sealing compound technology is also proposed in the industry, and the electromagnetic side sealing technology tries to control the flow and solidification of molten steel through electromagnetic force. However, these techniques have a number of drawbacks. The solid phase compounding method such as rolling compounding and explosion compounding has the problems of long production flow and high energy consumption, and interfaces are easy to oxidize or pollute in the compounding process, so that the bonding strength is insufficient, the cost is high, and the production requirements of large scale, low cost and high quality are difficult to meet. The electromagnetic side sealing technology has the advantages of complex control, huge energy consumption, sensitivity to the physical properties of molten steel and higher practical application difficulty. Therefore, the prior art lacks a core method and equipment that can fundamentally solve the problem of achieving controlled solidification and metallurgical bonding of two molten metals. Disclosure of Invention The application provides a composite billet continuous casting device and a continuous casting method, which aim to solve the technical problems of long preparation flow, high energy consumption and difficult control of interface quality of the traditional composite material. The application provides a composite billet continuous casting device which adopts the following technical scheme that the composite billet continuous casting device comprises a bearing frame, a crystallizer, a width dynamic adjusting mechanism and a cooling system, wherein the crystallizer is connected with the bearing frame, the vertical section of the crystallizer is rectangular, a physical separator is arranged in the crystallizer and divides the position, close to the upper part, of a cavity of the crystallizer into a first runner and a second runner along the length direction, the tail ends of the first runner and the second runner are converged into a combined runner at the position, close to the lower part, of the cavity of the crystallizer, the cooling system comprises a first runner cooling system and a second runner cooling system which respectively correspond to the first runner and the second runner, the first runner cooling system and the second runner cooling system are used for independently controlling the cooling strength of the corresponding runners, and the width dynamic adjusting mechanism is used for driving the physical separator to reciprocate along the length direction of the crystallizer so as to adjust the width ratio of the first runner and the second runner to control the growth of a solidified shell. By adopting the technical scheme, the bearing frame provides support for the crystallizer, the cavity is divided into the first runner and the second runner by the physical separator in the crystallizer with the rectangular vertical section and is converged into the combined runner at the lower part, so that two molten steels can flow respectively and are finally combined, two independent cooling systems can independently adjust the cooling strength of the runners at two sides to realize independent and accurate control of solid