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Quality control method for producing YQ450NQR1 casting blank with 280 mm*380 mm section

A quality control method and billet technology, applied in the field of material metallurgy, can solve the problems of large fluctuations in head and tail size, many difficulties, and large differences, and achieve the effect of uniform thickness, remarkable effect and complete surface.

Pending Publication Date: 2022-01-18
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are many passes in the blanking process, the control effect of the guide is not obvious, and the size of the head and tail fluctuates greatly, which affects the cutting loss and is not conducive to the improvement of the yield
[0009] There is a large difference between the same size and different sizes, and it is more difficult for users to use, and the ingredients are difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific examples.

[0024] 280mm×380mm section produces YQ450NQR1 slab quality control method, the steelmaking process is blast furnace hot metal-hot metal pretreatment-converter smelting-refining-continuous casting.

[0025] The continuous casting crystallizer chooses the mold with the same size as the slab, and the physical properties of mold flux meet the following requirements: viscosity: 0.64-0.65Pa.S, basicity: 0.64-0.66, melting weight: 0.64-0.65g / ml, softening The temperature is 1213-1217°C, the hemispherization temperature is 1219-1228°C, the flow temperature is 1230-1239°C, and the slag consumption is 0.42-0.45kg / t steel during application.

[0026] The casting speed of the continuous casting machine is 0.62-0.65min / , the superheat degree is controlled at 20-30℃, and the superheat degree of the first furnace is controlled at 25-40℃. The crystallizer adopts sinusoidal vibration, the vib...

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Abstract

The invention discloses a quality control method for producing a YQ450NQR1 casting blank with a 280 mm*380 mm section. By using a tubular crystallizer with the 280 mm*380 mm section and matching special crystallizer protective slag, a steel billet can form a blank shell with a complete surface and uniform thickness in the crystallizer, and particularly, the control effect on casting blank surface quality defects caused by peritectic phase change linear shrinkage is remarkable.

Description

technical field [0001] The invention relates to the field of material metallurgy, in particular to a quality control method for producing YQ450NQR1 slabs with a section of 280mm×380mm. 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-weather resistance 310 B-shaped steel has high strength and corrosion resistance. Special section steel is an important guarantee for the heavy load of the train. [0003] When the molten steel undergoes peritectic reaction solidification, the rapid cooling in the crystallizer forms the primary solidified slab shell, and the transformation of high-temperature ferrite to austenite occurs during the process, and the high-temperature ferrite itself has 3.5% to 4.0% body Shrinkage, the more critical point is that the density of high-temperature ferrite is 0.5% to 1.0% smaller than that of aus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111B22D11/16B22D11/22B22D11/20B22D11/115
CPCB22D11/111B22D11/166B22D11/22B22D11/225B22D11/20B22D11/115
Inventor 宋振东王永明涛雅卜向东惠治国郭利宏乔瑞栋
Owner BAOTOU IRON & STEEL GRP