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Method for controlling surface quality of YQ450NQR1 zed bar bloom

A technology of surface quality and control method, which is applied in the field of iron and steel metallurgy, can solve problems such as research on key technical methods of surface quality control that have not been seen, and achieve remarkable results

Active Publication Date: 2019-02-26
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, and the surface quality of the YQ450NQR1 B-shaped steel continuous casting bloom There is basically no research on key technology methods for control

Method used

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Examples

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Embodiment

[0016] 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 0.98Pa.S, alkalinity 0.81, softening temperature 1131°C, hemispherizatio...

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Abstract

The invention discloses a method for controlling the surface quality of a YQ450NQR1 zed bar bloom in the field of ferrous metallurgy, which mainly improves a molten steel continuous casting stage, a tubular crystallizer which is consistent with the section size of a casting blank during continuous casting is used and special continuous casting crystallizer protective slag is matched, wherein the physical property indexes of the protective slag are as follows: the viscosity is 0.98-0.99Pa. S, the alkalinity is 0.80-0.82, the softening temperature is 1129-1133 DEG C, the hemispherization temperature is 1196-1199 DEG C, the flow temperature is 1203-1204 DEG C, the slag consumption is 0.52-0.56 kg / t steel in an application process. According to the invention, the large-size-section tubular crystallizer is used, and the special crystallizer protective slag is matched, so that the billet can form a billet shell with a complete surface and an uniform thickness in the crystallizer, and the control effect on the surface quality defect of the billet caused by the shrinkage of the peritectic phase transition line is remarkable, the problem of rolling and pulling crack caused by the surface quality defect of the casting blank is solved, and an important foundation for controlling the pulling crack defect in the later rolling stage of the zed bar is laid.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling the surface quality of a YQ450NQR1 B-shaped steel bloom. 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 relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D11/04B22D11/18
CPCB22D11/0406B22D11/111B22D11/18
Inventor 李红光陈天明陈亮刘明
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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