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Smelting method capable of improving quality of blank for bainite steel rail

A smelting method and bainite technology, applied in the field of rail billet smelting, can solve the problems of long-time normalizing, segregation in the center of the billet, and inclusions easily exceeding the standard, and achieve the effect of shortening the process cycle and reducing the segregation of the billet.

Inactive Publication Date: 2018-04-17
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After analysis, there are deficiencies in this document: first, the segregation in the center of the billet is serious, which requires a long time of normalizing to eliminate it; second, the inclusions caused by adding too much alloy are easy to exceed the standard

Method used

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  • Smelting method capable of improving quality of blank for bainite steel rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A smelting method capable of improving the quality of billets for bainite rails, the steps of which are:

[0026] 1) Converter conventional smelting;

[0027] 2) Tapping, during which, the temperature of the tundish is controlled at 11°C above the liquidus line, and the reduction rate of the liquid core is 3.2% by using liquid core reduction and electromagnetic stirring; the tundish is operated with slag blocking and full ladle; Hole structure; nozzle insertion depth is 183.5mm;

[0028] 3) Continuous casting and cooling, during which: casting speed is 0.32m / min, crystallizer water flow rate is 2623.5L / min; cooling water flow setting in the secondary cooling section: water flow rate in the first zone is 19.4L / min, The water flow rate in the second zone is 13.3L / min, the water flow rate in the third zone is 14.1L / min, the water flow rate in the fourth zone is 5.0L / min, and the water flow rate in the fifth zone is 2.6L / min; the distance between the solidification end and...

Embodiment 2

[0032] A smelting method capable of improving the quality of billets for bainite rails, the steps of which are:

[0033] 1) Converter conventional smelting;

[0034] 2) Tapping, during which, the temperature of the tundish is controlled at 12°C above the liquidus line, and the reduction rate of the liquid core is 3.7% by using liquid core reduction and electromagnetic stirring; the tundish adopts slag blocking and full ladle operation; the nozzle is four Hole structure; nozzle insertion depth is 192mm;

[0035] 3) Continuous casting and cooling, during which: casting speed is 0.35m / min, crystallizer water flow rate is 2723.5L / min; cooling water flow setting in the secondary cooling section: water flow rate in the first zone is 19.8L / min, The water flow rate in the second zone is 13.3L / min, the water flow rate in the third zone is 15.2L / min, the water flow rate in the fourth zone is 5.2L / min, and the water flow rate in the fifth zone is 2.9L / min; the distance between the solid...

Embodiment 3

[0039]A smelting method capable of improving the quality of billets for bainite rails, the steps of which are:

[0040] 1) Converter conventional smelting;

[0041] 2) Tapping, during which the temperature of the tundish is controlled at 14°C above the liquidus line, and the reduction rate of the liquid core is 3.3% by using liquid core reduction and electromagnetic stirring; the tundish adopts slag blocking and full ladle operation; the nozzle is four Hole structure; nozzle insertion depth is 187mm;

[0042] 3) Continuous casting and cooling, during which: casting speed is 0.32m / min, crystallizer water flow rate is 2657.2L / min; cooling water flow setting in the secondary cooling section: water flow rate in the first zone is 18.7L / min, The water flow in the second zone is 11.6L / min, the water flow in the third zone is 15.6L / min, the water flow in the fourth zone is 5.8L / min, and the water flow in the fifth zone is 2.9L / min; the distance between the solidification end and the ...

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Abstract

A smelting method that can improve the quality of billets for bainite rails: conventional smelting in a converter; 2800L / min; cooling water flow setting in the secondary cooling section: the water flow in the first zone is 16.4-24.8L / min, the water flow in the second zone is 10.3-16.2L / min, the water flow in the third zone is 14.1-16.8L / min, and the water flow in the fourth zone is 14.1-16.8L / min. The water flow rate in the zone is 4.3~6.2L / min, and the water flow rate in the fifth zone is 2.5~3.5L / min; and the distance between the solidification end and the liquid level of the crystallizer is controlled at 18.50~19.57m; the thickness of mold powder is controlled at 4.1~4.7mm. The invention can significantly reduce slab segregation, and the resulting phenomenon of broken rails, peeling off blocks, etc., and the rate of change of judgment is reduced by at least 5%, and the normalizing and quenching processes are cancelled, thereby greatly shortening the heat treatment process cycle.

Description

technical field [0001] The invention relates to a steel smelting method, in particular to a steel rail billet smelting method. Background technique [0002] With the continuous increase of railway speed, traction weight, operating density and annual total weight, the wear of rails and damages such as rolling contact fatigue and crushing are aggravated. Due to the large impact force of the wheel and the small contact surface of the wheel and rail, the contact stress of the turnout is more serious. In my country's rail usage opinions, it is clearly required that heat-treated rails be used in road sections with a curve radius ≤ 1500m. Turnouts must be processed with heat-treated rails or bainite rails to improve the wear resistance and fatigue resistance of rails and increase their service life. [0003] From the current bainite rail steel used, although the mechanical performance indicators are better than ordinary rails, there are still phenomena such as broken rails, peelin...

Claims

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Application Information

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IPC IPC(8): B22D11/22B22D11/20B22D11/115
CPCB22D11/22B22D11/115B22D11/20B22D11/225
Inventor 徐志东朱敏周剑华吴杰王瑞敏郑建国费俊杰叶途明苏尚飞
Owner 武汉钢铁有限公司
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