Preparation method of high-quality plastic mold steel extra-thick plate continuous casting master billet

A plastic mold, high-quality technology, applied in the field of continuous casting, can solve the problem of limited improvement in the quality of the center of the billet, and achieve the improvement of center segregation and center porosity defects, high-efficiency use requirements, and good effects.

Active Publication Date: 2019-08-09
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage is that it can effectively improve the internal quality of the low pressure reduction ratio flaw detection thick plate, and control the flaw detection pass rate of the low pressure reduction ratio flaw detection thick plate to more than 98% in the production process; but the improvement of the looseness of the core quality of the slab is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The specific process of the preparation method of the high-quality plastic mold steel extra-thick plate continuous casting master blank is as follows.

[0017] Continuous casting produces P20 mold steel with a cross-sectional size of 1800mm×254mm. The casting speed of the continuous casting machine is 0.88m / min, and the casting speed is kept stable. The superheat of the molten steel in the tundish is 20°C; Under technical control, the reduction rate is 0.03mm / s, the length of the reduction interval is 10m, and the total reduction is 35mm. Among them, the solid fraction of the part under light pressure ranges from 0.5 to 0.98, and the solid fraction of the part under heavy pressure ranges from 0.98 to 1. The solid phase ratio in the 10th segment is 0.93-1, which belongs to the superposition area of ​​light reduction and heavy reduction, so the distribution of reduction is 0.08mm in the 8th segment of light reduction, and 2.69mm in the 9th segment of light r...

Embodiment 2

[0019] Embodiment 2: The specific process of the preparation method of the high-quality plastic mold steel extra-thick plate continuous casting master blank is as follows.

[0020] Continuous casting produces P20 mold steel with a cross-sectional size of 1800mm×260mm. The casting speed of the continuous casting machine is 0.83m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 20°C; Under technical control, the reduction rate is 0.03mm / s, the length of the reduction interval is 9m, and the total reduction is 29mm. Among them, the solid phase ratio of the part under light reduction ranges from 0.6 to 0.95, and the solid phase ratio of the part under heavy pressure ranges from 0.95 to 1; the solid phase ratio of the 10th segment is 0.94 to 1, which belongs to light pressure The overlapping area with the heavy pressure, so the distribution of the reduction amount is 1.79mm under the 8-stage light reduction, 3.21mm under the 9-stage light r...

Embodiment 3

[0022] Embodiment 3: The specific process of the preparation method of the high-quality plastic mold steel extra-thick plate continuous casting master blank is as follows.

[0023] Continuous casting produces P20 die steel with a cross-sectional size of 1800mm×260mm. The casting speed of the continuous casting machine is 0.85m / min, and the casting speed is kept stable. The superheat of the molten steel in the tundish is 30°C; Under technical control, the reduction rate is 0.03mm / s, the length of the reduction interval is 8m, and the total reduction is 27mm. Among them, the solid phase ratio of the part under light reduction ranges from 0.6 to 0.94, and the solid phase ratio of the part under heavy pressure ranges from 0.95 to 1; the solid phase ratio of the 10th segment is 0.92 to 1, which belongs to light reduction. The overlapping area with the heavy pressure, so the distribution of the reduction amount is 2.51mm under the 8-stage light reduction, 2.73mm under the 9-stage li...

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PUM

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Abstract

The invention discloses a preparation method for high-quality continuously cast mother billets of a plastic mould steel extra-thick plate. The preparation method is characterized in that in a continuous casting process, billet pulling speed is controlled to be 0.80m / min-0.90m / min; solidification end is heavily pressed down; and press-down amount is distributed according to a solid phase rate under light pressing and heavy pressing. The preparation method disclosed by the invention improves internal quality of cast billets by a solidification end dynamic heavy-pressing technology, so that the center segregation defect and the center porosity defect of cast billets are improved; under the target of producing the extra-thick plate with specification of 120 mm (compression ratio only being 2.12 to 1), internal quality of a flaw detection thick plate with a low compression ratio is effectively improved, and a flaw detection qualification rate of the flaw detection thick plate with the low compression ratio in a production process is controlled to be 99% or higher. Cast billets industrially produced by the method are good in effect after being implemented, and can efficiently meet use requirements of mould steel.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for preparing a high-quality plastic mold steel extra-thick plate continuous casting blank. Background technique [0002] Plastic mold steel, which has high strength, hardness, wear resistance and sufficient toughness, is mainly used in cold rolling, hot rolling and plastic mold steel for forging, stamping, cutting and die casting. Due to the complex working conditions of this type of steel, the performance requirements for mold steel are relatively high. In particular, it is necessary to ensure that the center density and center porosity of billets and extra-thick plates are improved, otherwise it is difficult to ensure the characteristics of plastic mold steel. The safety and quality of thick plates. Therefore, eliminating the central porosity and central segregation of the slab is of great significance to the production of this type of steel by continuous casting. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/12B22D11/20
CPCB22D11/1206B22D11/20
Inventor 张洪波刘铁力刘志远王重君朱苗勇王云阁祭程程巨广尹绍江蔡兆镇姚军路陈兵王紫林
Owner TANGSHAN IRON & STEEL GROUP
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