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The control method to reduce the shrinkage cavity at the end of the billet

A technology of compression control and shrinkage cavity, which is applied in the field of slab continuous casting process control, can solve the problem of large shrinkage cavity at the tail of the billet, and achieve the goal of reducing the shrinkage cavity at the tail of the billet, shortening the length of the shrinkage cavity, and reducing the amount of shrinkage cavity Effect

Active Publication Date: 2017-06-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide an automatic control method for reducing the shrinkage cavity of the tail billet of a billet continuous casting machine, so as to solve the problem of large shrinkage holes at the billet tail under the conventional tension straightening pressure control mode, thereby reducing the quality loss of the billet and improving the quality of the billet. Yield of continuous casting machine

Method used

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  • The control method to reduce the shrinkage cavity at the end of the billet
  • The control method to reduce the shrinkage cavity at the end of the billet
  • The control method to reduce the shrinkage cavity at the end of the billet

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example 1

[0068] Steel type: 20CrMoH, [C] content between 0.17 and 0.2; superheat: 30°C; casting speed: 0.65m / min; surface); secondary cooling mode: CC02K30; the casting process adopts the conventional tension and straightening pressure control mode, and the pressure is ≤15t;

[0069] 1) Obtain the solid phase ratio of the slab under the tension leveler of each flow through the model computer:

[0070] 1# 2# 3# 4# 5# 6# 7# 8# 9# Solid fraction fs 0.09 0.21 0.34 0.45 0.59 0.76 0.96 1 1

[0071] 2) According to the range of solid phase ratio required for the set compression point (fs=0.2~0.7), determine the tail blank compression point as 2#, 3#, 4#, 5# tension leveler;

[0072]3) According to the scope and practical experience, set the compression amount as:

[0073] 1# 2# 3# 4# 5# 6# 7# 8# 9# Compression mm 0 2 3 3 2 0 0 0 0

[0074] 4) Tail billet compression control starting point: when the casting machine en...

example 2

[0078] Steel type: SAE5120M, [C] content between 0.18 and 0.22; superheat: 25°C; casting speed: 0.65m / min; surface); secondary cooling mode: CC04K26; the casting process adopts the conventional tension and straightening pressure control mode, and the pressure is ≤15t;

[0079] 1) Obtain the solid phase ratio of the slab under the tension leveler of each flow through the model computer:

[0080] 1# 2# 3# 4# 5# 6# 7# 8# 9# Solid fraction fs 0.14 0.29 0.47 0.61 0.83 1 1 1 1

[0081] 2) According to the range of solid phase ratio required for the set compression point (fs=0.2~0.7), determine the tail blank compression point as 2#, 3#, 4# tension leveler;

[0082] 3) According to the scope and practical experience, set the compression amount as:

[0083] 1# 2# 3# 4# 5# 6# 7# 8# 9# Compression mm 0 2 3 2 0 0 0 0 0

[0084] 4) Tail billet compression control starting point: when the casting machine enters th...

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Abstract

The invention discloses an automatic control method for reducing a shrinkage hole of a tail billet by a square billet continuous casting machine. The method comprises the following steps: position sensors are arranged on pressure roller oil cylinders of withdrawal and straightening units; a solid-phase ratio of a cast blank under each withdrawal and straightening unit is obtained through the temperature field distribution calculation of a model computer to select and determine the compression acting range of the tail billet; a multi-frame substep compression mode is adopted in the compression acting range; after the compression starting condition is satisfied, each withdrawal and straightening unit in the compression range is switched from a pressure control mode to a position control mode one by one, and the displacement quantity of each pressure roller oil cylinder is adjusted through the position closed loop adjustment according to the set compression quantity, so that a pressure roller of each withdrawal and straightening unit reaches the set pressure position; the local deceleration process in drawing of the tail billet is performed: when the tundish molten steel weight is reduced to the preset quantity, the billet drawing speed of the withdrawal and straightening units is decelerated; after the tail of the cast blank leaves from a crystallizer, the billet drawing speed is recovered to the standard drawing speed; and after the compression ending condition is satisfied, the compression process of the tail billet is finished. The method reduces the mass loss of the cast blank.

Description

technical field [0001] The invention relates to a method for controlling a billet continuous casting process, in particular to a control method for reducing tail billet shrinkage cavity for a billet continuous casting machine. Background technique [0002] Continuous casting is a production process that continuously casts molten steel into slabs. Its main processes are as follows: figure 1 As shown: the ladle (also known as ladle) 2 containing molten steel 1 is injected into the tundish 4 through the nozzle 3a at the bottom, and the nozzle 3b at the bottom of the tundish 4 distributes the molten steel to each flow crystallizer 5, and the molten steel is crystallizing After primary cooling in the device 5 to form a slab shell, after secondary cooling in the secondary cooling zone of the fan section and straightening by the tension leveler 7, the casting slab 10 meeting the technological requirements is continuously formed, and then output through the roller table 9. The tens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D11/12
CPCB22D11/1226B22D11/18
Inventor 金国平蒋际欢刘俊江柳凯李旭东王勇孟庆玉
Owner BAOSHAN IRON & STEEL CO LTD