Smelting method for improving the cleanliness of heavy rail steel

A smelting method and cleanliness technology, which are applied in the smelting field of improving the cleanliness of heavy rail steel, can solve the problems of the difficulty of meeting the cleanliness of heavy rail steel, and achieve the improvement of fatigue properties and mechanical properties, increase fluidity, and control nitrogen content. Effect

Active Publication Date: 2020-06-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the cleanliness of the existing domestic heavy rail steel is difficult to meet the requirements of high-speed railways P+S+O+N+H≤160ppm, and various ratings of inclusions≤1.0

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 4kg / t molten iron active lime and 1kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 15min, after desulfurization Obtain low sulfur molten iron, S content: 0.001%, P content: 0.082%.

[0062] Converter smelting: add molten iron after desulfurization into the converter, add 15kg / t of active lime of molten iron, 10kg / t of quartz sand of molten iron, 10kg / t of high magnesium lime of molten iron, 2kg / t of molten iron tSodium carbonate of molten iron is smelted by single slag method, and at the same time blowing is carried out with oxygen supplied by oxygen lance. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1668°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0013%. After the...

Embodiment 2

[0068] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 6kg / t molten iron active lime and 3kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 30min, after desulfurization Obtain low sulfur molten iron, S content: 0.001%, P content: 0.120%.

[0069] Converter smelting: add molten iron after desulfurization into the converter, add 20kg / t of active lime of molten iron, 15kg / t of quartz sand of molten iron, 15kg / t of high magnesium lime of molten iron, 3kg / t of molten iron tSodium carbonate of molten iron is smelted by single slag method, and at the same time blowing is carried out with oxygen lance supplied with oxygen. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1658°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0011%. After t...

Embodiment 3

[0075] Molten iron pretreatment: use molten iron as raw material, use carrier gas to mix 5kg / t molten iron active lime and 2kg / t molten iron passivated magnesium powder, use rotary desulfurization spray gun to spray into molten iron, the injection time is 20min, after desulfurization Obtain low sulfur molten iron, S content: 0.0006%, P content: 0.105%.

[0076] Converter smelting: add molten iron after desulfurization into the converter, add 18kg / t of active lime of molten iron, 13kg / t of quartz sand of molten iron, 13kg / t of high magnesium lime of molten iron, 2.5kg / t of molten iron steelmaking sludge ball and 15kg Sodium carbonate of / t molten iron is smelted by single slag method, and oxygen lance is used for blowing at the same time. The blowing lance position of the oxygen lance is controlled at 1.5-2.5m, and the temperature of the blowing process is 1658°C. After the smelting is finished, the molten iron is initially smelted into molten steel with a P content of 0.0012%....

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Abstract

The invention discloses a smelting method for improving the cleanliness of heavy rail steel and belongs to the technical field of steel metallurgy. The technical problem solved by the invention is that existing domestic heavy rail steel cleanliness can not meet the requirements of high-speed railways. The method comprises the steps of liquid iron pretreating, converter smelting, LF refining, RH refining and continuous casting and performs blowing smelting on the liquid iron taking active lime, silica sand, high-magnesium lime, steel smelting sludge pellet and sodium carbonate as slag making materials in the converter smelting process, and the content of P is controlled to be 0.003% or below. By means of the above steps of the smelting method for improving the cleanliness of the heavy railsteel, the content of elements in a steel rail can be controlled as P less than or equal to 0.0060%, S less than or equal to 0.0030%, O less than or equal to 0.0010%, N less than or equal to 0.0050% and H less than or equal to 0.00015%, P+S+O+N+H is less than or equal to 160 ppm, the grade of inclusion is less than or equal to 1.0 grade, the cleanliness of the heavy rail steel is significantly improved, and the smelting method for improving the cleanliness of the heavy rail steel has certain social benefits and is worth popularizing and applying.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a smelting method for improving the cleanliness of heavy rail steel. Background technique [0002] Heavy rail steel is the main component of railway tracks. During railway transportation, steel rails provide effective support and guidance for locomotives and must bear huge vertical pressure from wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid speed, and it is becoming more and more high-speed and heavy-duty. This undoubtedly puts forward stricter requirements on the quality of the rails. [0003] When the rail is in contact with the wheel, it bears the reciprocating and variable load of the locomotive. Its cleanliness has an important impact on the life of the rail. The inclusions in the steel are the main reasons for the internal damage and fatigue damage of the hea...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C5/28C21C7/10C21C7/06C21C7/064
CPCC21C1/02C21C5/28C21C7/06C21C7/064C21C7/10
Inventor 陈亮陈天明李红光
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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