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Method for controlling superheat degree of continuous casting tundish

A continuous casting tundish and superheating technology, applied in the field of steelmaking, can solve the problems of unfavorable composition segregation control, etc., achieve the effect of reducing internal defects, obvious effect, and improving internal quality

Active Publication Date: 2018-07-20
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that a higher degree of superheat is beneficial to surface quality and purity, but it is unfavorable to the control of low shrinkage cavity and composition segregation; on the contrary, the results are basically opposite

Method used

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Embodiment Construction

[0021] The technical scheme of the present invention will be further described below through specific embodiments

[0022] A method for controlling the superheat of a continuous casting tundish comprises the following steps:

[0023] 1. When the smelting time is more than 45 minutes, Class A steel ladle is the steel ladle for continuous use. The end point temperature is 1590°C, and the end point temperature is allowed to be ±2°C. When the smelting time is less than 45 minutes, A2 ladle is used. When the ladle is left empty for 2 hours after tapping the converter, the end point temperature is 1591°C, the end point temperature is +4°C, the large section (larger than 1300*220mmg billets) allows negative deviation, the small section (950*220mm-1300*220mmg) Blank) positive deviation is allowed but the deviation range shall not exceed ±5°C.

[0024] 2. When the smelting time is more than 45 minutes, the end point temperature of Class A ladle is allowed to be ±3°C, the large section...

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Abstract

The invention discloses a method for controlling a superheat degree of a continuous casting tundish. The method comprises the following steps: (1) when the smelting time is longer than 45 minutes, theterminal temperature of an A type steel ladle is 1590+-3 DEG C; and when the smelting time is not longer than 45 minutes, the terminal temperature of an A2 steel ladle is 1587-1592 DEG C; (2) when the smelting time is longer than 45 minutes, the terminal temperature of the A type steel ladle is 1590+-3 DEG C; (3) when the smelting time is not longer than 45 minutes, the terminal temperature of the A2 type steel ladle is 1587+-5 DEG C; and the temperature of a liquid-phase line is higher than 1528 DEG C; (4) when the smelting time is not longer than 40 minutes, the terminal temperature of theA2 type steel ladle is 1587+-7 DEG C; (5) after alloy adding, lime melting and top slag deoxidation, 5 kg carbon powder is added by every other 2 minutes; and the current curve is fluctuated up and down within 20 mm; (6) the argon flow is controlled to a soft blowing mode; and the temperature is reduced by 1 DEG C at every minute; and (7) the temperature is reduced by 3 DEG C at each time of feeding 100 m wires. The method adopts optimal process measures, controls the superheat degree of the steel making continuous casting tundish, increases the accordant rate of the superheat degree of the continuous casting tundish, reduces internal defects of continuous cast blanks, and improves the interior quality of steel continuous cast blanks.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a continuous casting method for controlling the superheat of a continuous casting tundish. Background technique [0002] Low superheat pouring in continuous casting tundish is one of the most important process technologies for continuous casting process stability and high-quality casting slab. If the superheat is high, the shell of the billet will be thinned, and the molten steel is prone to secondary oxidation and inclusions A series of production quality accidents such as bulging, breakout, well-developed columnar crystals, central segregation, and shrinkage cavities are prone to occur. Most of the slabs produced by the slab continuous casting machines in steelmaking enterprises are used as raw materials for hot rolling and medium and heavy plate factories. Due to the rolling characteristics of hot rolling and medium and heavy plate with small compression ratio, the quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/10
CPCB22D11/10B22D11/16
Inventor 郭庆华吴军陈刚李立民秦军吾塔汤新彦卜志胜郭鹏孙学刚
Owner XINJIANG BAYI IRON & STEEL