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Continuous casting production process for improving quality of free cutting steel casting blank

A production process and steel casting technology, applied in the field of free-cutting steel production process, can solve problems such as difficult separation, surface pinholes, skin turning, etc., to prevent segregation of lead components, improve internal cracks, and improve the quality of casting billets.

Active Publication Date: 2012-01-04
SHOUGANG GUIYANG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) The carbon content of low-carbon free-cutting steel is in the range of peritectic and sub-peritectic steel, the slab condensation shrinkage and internal stress are relatively large; the shape and quantity of inclusions in the steel are difficult to control; the interfacial tension of this steel is small, and the steel slag is mixed Difficult to separate after casting, slabs are prone to slag inclusion and sticky slag
The above characteristics make the continuous casting slab of free-cutting steel prone to a series of quality defects such as lead segregation, slag inclusions, subcutaneous air bubbles, surface pinholes, turning over, scarring, depressions, cracks, etc.

Method used

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  • Continuous casting production process for improving quality of free cutting steel casting blank
  • Continuous casting production process for improving quality of free cutting steel casting blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1. When producing lead-free free-cutting steel. Taking Y45 free-cutting steel as an example, its main chemical composition is shown in the following table:

[0033] C％

Si%

Mn%

P％

S％

0.48

0.25

0.70

0.020

0.028

[0034] The balance is Fe and unavoidable impurities. When continuously casting a billet with a cross-sectional size of 150mm×150mm, the casting superheat is controlled at 15-45°C, the casting speed is controlled at 1.70-2.45m / min, and it is best to control the casting superheat at 15-25°C , The billet casting speed is controlled at 2.00-2.20m / min, and the casting speed increases with the decrease of superheat. The amplitude of the crystallizer is controlled at 3-8mm, the vibration frequency of the mold is controlled at 150-300cpm, the negative slip rate is controlled at -20--80%, the distance between the vibration marks of the slab is controlled at 6-11mm, the secondary cooling wate...

Embodiment 2

[0038] Example 2. When producing leaded free-cutting steel. Taking Y45Pb as an example, its main chemical composition is shown in the following table:

[0039] C％

Si%

Mn%

P％

S％

Pb%

0.48

0.25

0.70

0.020

0.028

0.21

[0040] The balance is Fe and unavoidable impurities. When continuously casting a billet with a cross-sectional size of 150mm×150mm, the casting superheat is controlled at 15-45°C, and the billet casting speed is controlled at 1.70-2.45; it is best to control the casting superheat at 15-25°C. The blank casting speed is controlled at 2.00-2.20m / min, and the casting speed increases with the decrease of superheat. The amplitude of the crystallizer is controlled at 3-8mm, the vibration frequency of the mold is controlled at 150-300cpm, the negative slip rate is controlled at -20--80%, the distance between the vibration marks of the slab is controlled at 6-11mm, the secondary cooling water...

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Abstract

The invention discloses a continuous casting production process for improving quality of a free cutting steel casting blank. The quality defects of lead segregation, slag inclusion, subsurface bubbles, surface pinholes, skull patch, scab, hollowness, cracks and the like of the free cutting steel casting blank are overcome by optimizing and controlling the parameters of superheat degree and stretching speed of the continuous casting process, taper of a crystallizer, cooling water inlet and outlet temperature difference of the crystallizer, amplitude of the crystallizer and the like; and the quality of the free cutting steel continuous casting blank is improved.

Description

technical field [0001] The invention relates to a production process of free-cutting steel, in particular to a continuous casting production process capable of improving the quality of free-cutting steel slabs, and belongs to the technical field of metallurgy. Background technique [0002] Free cutting steel (free cutting steel), referred to as free cutting steel. It is an alloy steel that adds a certain amount of one or more than one kind of easy-cutting elements such as sulfur, phosphorus, lead, calcium, selenium and tellurium to the steel to improve its cutting performance. Free-cutting steel is recognized as one of the three steel types that are difficult to achieve continuous casting in the world. It has the following characteristics: (1) Most steel types have high phosphorus, sulfur and oxygen content in steel. (2) The carbon content of low-carbon free-cutting steel is in the range of peritectic and sub-peritectic steel, the slab condensation shrinkage and internal st...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/22B22D11/20
Inventor 周英豪王翔何勇夏辉华白映林张国成刘春堂潘江杨德彬周兵廖德文金俊鑫肖丹黄仁勇刘华刘银波
Owner SHOUGANG GUIYANG SPECIAL STEEL
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