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Control method of corner cracks in yq450nqr1 B-shaped steel blooms

A corner crack and control method technology, which is applied in the field of iron and steel metallurgy, can solve problems that have not been seen in research, and achieve the effects of quality assurance, optimized cooling, and remarkable effects

Active Publication Date: 2021-02-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many scholars in China have carried out a lot of research work on the B-shaped steel, but the research mainly focuses on the analysis and control of the B-shaped steel rolling, the mechanical properties of the B-shaped steel, and the cracking defects of the B-shaped steel. Research on key technologies and methods of crack control is basically absent

Method used

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Examples

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Embodiment

[0015] This embodiment is that a certain steelmaking plant adopts the method of the present invention to produce 320mm * 410mm section YQ450NQR1 B-shaped steel bloom. The specific application of this example to the technology of the present invention is as follows: through converter steelmaking-deoxidation alloying on a small platform behind the furnace-LF electric heating refining alloy composition fine-tuning, to obtain molten steel with qualified chemical composition and then carry out continuous casting production. The specific operations during continuous casting are: (1) Continuous casting with a tubular mold with a cross-section of 320mm×410mm to optimize the cooling of the corners of the slab and improve the uniformity control of the solidification evolution at the corners of the slab; (2) Cooperate with the special continuous casting Mold flux, its key physical property requirements are: viscosity 0.99Pa.S, basicity 0.82, softening temperature 1129°C, hemispherization ...

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Abstract

The present invention discloses a method for controlling cracks at the corners of YQ450NQR1 B-shaped steel billets in the field of iron and steel metallurgy. Special mold flux for continuous casting mold. The physical properties of the flux are: viscosity 0.99~1.00Pa.S, alkalinity 0.81~0.83, softening temperature 1127~1130℃, hemispherization temperature 1194~1198℃, flow temperature 1201 ~1203℃, slag consumption 0.61~0.65kg / t during application 钢 . The invention optimizes the cooling of the corners of the slab and improves the uniformity control of the solidification evolution at the corners of the slab by using a tubular crystallizer with a large cross-section, and cooperates with the special mold slag to effectively protect the YQ450NQR1 B-shaped steel bloom The corner quality of the slab, especially the control effect on the defect width of the slab corner crack caused by the shrinkage of the peritectic transformation line is remarkable, which solves the problem of rolling cracks caused by the microcracks at the corner of the slab.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling cracks at corners of YQ450NQR1 B-shaped steel blooms. Background technique [0002] As my country's economic development drives railway transportation, railway steel continues to develop. As an important variety of railway steel, YQ450NQR1 high-strength and high-weathering B-shaped steel has high strength and corrosion resistance. It is a special special product for making train car middle beams Section steel is an important guarantee for the heavy load of trains. From the appearance point of view, B-shaped steel is a large-scale asymmetric cross-section profile. Although the cross-section shape is simple, due to the different lengths and thicknesses of the upper and lower legs, there is serious uneven deformation during the rolling process, and the rolled piece bends towards the short leg. At the same time, it has a tendency to reverse relative t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/04B22D11/111B22D11/16B22D11/20B22D11/18B22D11/22B22D11/115
CPCB22D11/04B22D11/111B22D11/115B22D11/166B22D11/18B22D11/20B22D11/22B22D11/225
Inventor 李红光陈天明陈亮刘明
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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