Method for controlling center segregation and looseness of fine blanking steel continuous casting slab

A continuous casting and slab technology, which is applied in the field of controlling segregation and porosity of the fine blanking steel continuous casting slab, and controlling the internal defects of the continuous casting slab, can solve the problems of center segregation, etc. The effect of reducing production costs

Active Publication Date: 2019-04-02
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the center segregation and loosening of fine blanking steel continuous casting slabs, which mainly solves the technical problems of existing fine blanking steel continuous casting slab center segregation and loosening. Continuous slab caster with soft end reduction,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, the continuous casting machine is a slab continuous casting machine with the function of softly pressing the solidification end, the production grade is 16MnCr5 steel, and the cross-sectional size of the continuous casting slab is 1300mm×230mm.

[0014] A method for controlling center segregation and porosity of fine-blanking steel continuous casting slabs, the method comprising:

[0015] 1) During the continuous casting process, the casting speed of the continuous casting machine is controlled to be 1.1m / min, and the casting speed is kept stable, and the superheat of molten steel in the tundish is 20°C;

[0016] 2) Lightly reduce the solidification end of the continuous casting slab, the reduction rate of the solidification end light reduction is 0.56mm / min~1.1mm / min, the length of the reduction interval is 4.5m~7m, according to the distribution of solid phase The solid phase ratio fs of the soft reduction is 0.55~0.9, the distribution of the reduction, t...

Embodiment 2

[0018] Embodiment 2, the continuous casting machine is a slab continuous casting machine with the function of softly reducing the solidification end, the production grade is 16MnCr5 steel, and the cross-sectional size of the continuous casting slab is 1300mm×230mm.

[0019] A method for controlling center segregation and porosity of fine-blanking steel continuous casting slabs, the method comprising:

[0020] 1) During the continuous casting process, the casting speed of the continuous casting machine is controlled to be 1.2m / min, and the casting speed is kept stable, and the superheat of molten steel in the tundish is 20°C;

[0021] 2) Lightly reduce the solidification end of the continuous casting slab, the reduction rate of the solidification end light reduction is 0.56mm / min~1.1mm / min, the length of the reduction interval is 4.5m~7m, according to the distribution of solid phase The solid phase ratio fs of the soft reduction is 0.55~0.9, the distribution of the reduction, t...

Embodiment 3

[0023] Embodiment 3, the continuous casting machine is a slab continuous casting machine with the function of softly reducing the solidification end, the production grade is 16MnCr5 steel, and the cross-sectional size of the continuous casting slab is 1300mm×230mm.

[0024] A method for controlling center segregation and porosity of fine-blanking steel continuous casting slabs, the method comprising:

[0025] 1) During the continuous casting process, the casting speed of the continuous casting machine is controlled to be 1.2m / min, and the casting speed is kept stable, and the superheat of molten steel in the tundish is 30°C;

[0026] 2) Lightly reduce the solidification end of the continuous casting slab, the reduction rate of the solidification end light reduction is 0.56mm / min~1.1mm / min, the length of the reduction interval is 4.5m~7m, according to the distribution of solid phase The solid phase ratio fs of the soft reduction is 0.55~0.9, the distribution of the reduction, t...

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Abstract

The invention discloses a method for controlling center segregation and looseness of a fine blanking steel continuous casting slab, and mainly solves a technical problem of center segregation and looseness of an existing fine blanking steel continuous casting slab. The invention provides a method for controlling center segregation and looseness of a fine blanking steel continuous casting slab. Themethod comprises: 1) controlling pulling speed of a continuous casting machine to be 1.1 to 1.2 m/min during a continuous casting process and superheat degree of molten steel of a tundish to be 20-30DEG C; 2) performing solidification final end soft press on the continuous casting slab, pressing rate of the solidification final end soft press being 0.56-1.1 mm/min, and length of a pressing interval being 4.5 to 7.0 m. The method reduces production cost of the fine blanking steel continuous casting slab, improves quality of the fine blanking steel continuous casting slab, and horizontal low power no-center porosity proportion of the continuous casting slab is increased from 53% to 100%, and proportion of the center segregation <= 0.5 is increased from 61% to 100%.

Description

technical field [0001] The invention relates to a method for controlling internal defects of continuous casting slabs, in particular to a method for controlling center segregation and porosity of fine blanking steel continuous casting slabs, belonging to the technical field of steelmaking and continuous casting. Background technique [0002] Fine blanking steel first originated in Europe, and later developed rapidly in Japan, especially after the rapid development of the automobile industry, which brought a substantial increase in the demand for fine blanking steel. Taking 16MnCr5 steel as an example, it has good plasticity, welding performance and processability. It is mainly used in the internal structural parts of automobiles. According to statistics, there are about 70 to 100 kinds of fine blanking parts in a car. In addition to automobiles, it can also be used in motorcycles, office machinery, household appliances, sports and leisure, clocks and watches, electricians, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
CPCB22D11/16
Inventor 陈志平祭程朱苗勇苏瑞先李玉娣邓世民吴晨晖
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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