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Method for controlling quality of bloom hypo-peritectic steel continuous casting billet

A technology of continuous casting slab and bloom, which is applied in the field of controlling the quality of bloom subperitectic steel continuous casting slab, which can solve the problems of easy surface depression, large linear shrinkage coefficient, and easy formation of air gap, etc., to achieve optimal performance, Improve cooling uniformity and reduce the effect of solidification phase transition shrinkage

Inactive Publication Date: 2013-12-11
LAIWU IRON & STEEL GRP
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Problems solved by technology

Due to the large linear shrinkage coefficient of the peritectic reaction, it is easy to

Method used

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  • Method for controlling quality of bloom hypo-peritectic steel continuous casting billet
  • Method for controlling quality of bloom hypo-peritectic steel continuous casting billet

Examples

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Embodiment 1

[0029] The following method is used to manufacture the continuous cast slab of hypoperitectic steel Q235D. Specifically, the smelting and continuous casting process adopted is as follows: firstly through ultra-high power electric arc furnace (UHP), ladle refining furnace (LF), vacuum degassing furnace (VD), and then through continuous casting of alloy steel with an arc radius of 11 meters The sub-peritectic steel Q235D continuous casting slab with a section of 260mm×300mm is produced by the machine. Table 2 shows the smelting chemical composition of the bloom hypoperitectic steel Q235D continuous casting slab of Example 1.

[0030] Table 2 Steel melting chemical composition of the bloom hypoperitectic steel Q235D continuous casting slab in Example 1 (wt%)

[0031]

[0032] Calculate the carbon content C of the peritectic point according to the previous formula (2) J , and calculate the carbon content C of the peritectic point J The difference ΔC between the actual carbon...

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Abstract

The invention discloses a method for controlling the quality of a bloom hypo-peritectic steel continuous casting billet. The method for controlling the quality of the bloom hypo-peritectic steel continuous casting billet aims to overcome the quality defect that in the prior art, pits and fissures can easily occur on the surface of the casting billet. According to the method for controlling the quality of the bloom hypo-peritectic steel continuous casting billet, the content of silicon alloying element in the bloom hypo-peritectic steel continuous casting billet is controlled to be 0.16wt%-0.29wt%, the content of manganese in the bloom hypo-peritectic steel continuous casting billet is controlled to be 0.71wt%-0.79wt%, and then the carbon content CJ of a crystal point of a hypo-peritectic steel ladle is controlled so that the actual carbon content, by mass, of hypo-peritectic steel can be controlled to be 0.10wt%-0.16wt%; during continuous casting, the degree of superheat of continuous casting molten steel is controlled to be 20-30 DEG C, a dynamic water spraying aerosol cooling method is adopted in a casting billet secondary cooling area, the continuous casing throwing speed is 0.60-0.65m / min, and the performance parameters of casting powder of a crystallizer are that the alkalinity (CaO / SiO2) is 1.00-1.05, the melting point is 1130-1170 DEG C, and the viscosity is 0.55-0.75 Pa.s. Pits and fissures on the surface of the bloom hypo-peritectic steel continuous casting billet manufactured with the method are controlled comprehensively.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the quality of a continuous casting slab of hypoperitectic steel for a bloom. Background technique [0002] Sub-peritectic steel Q235D, as a carbon structural steel with D-grade quality requirements, is widely used in railway rail fasteners, vehicle equipment and parts, and its production process and quality requirements are very strict. The mass percentage of carbon content of hypoperitectic steel Q235D is usually controlled at 0.10wt%~0.17wt%. It belongs to the peritectic reaction zone with a large phase transformation shrinkage ratio, and is usually cast into a continuous casting slab with a section of 260mm×300mm. Due to the large linear shrinkage coefficient of the peritectic reaction, it is easy to form air gaps, resulting in quality defects such as depressions and cracks on the surface. Contents of the invention [0003] In order ...

Claims

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Application Information

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IPC IPC(8): B22D1/00B22D11/16B22D11/111
Inventor 何庆文马传庆邵明海刁峰梁建国
Owner LAIWU IRON & STEEL GRP
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