Smelting method for improving heavy rail steel cleanliness

A smelting method and technology of cleanliness, applied in the field of smelting to improve the cleanliness of heavy rail steel, can solve the problems that the cleanliness of heavy rail steel is difficult to meet, so as to inhibit the precipitation of MnS, reduce the rating of inclusions, and improve silicate inclusions effect of things

Inactive Publication Date: 2018-11-06
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

[0060] 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: 0.075%.

[0061] Converter smelting: add molten iron after desulfurization into the converter, add 15kg / t molten iron active lime, 10kg / t molten iron quartz sand, 10kg / t molten iron high magnesium lime and 2kg / t molten iron steelmaking sludge balls, single slag At the same time, oxygen is supplied by oxygen lance for blowing. 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 0.0025%. After the converter smelting is completed, the steel is tapped. When the...

Embodiment 2

[0067] 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: 0.076%.

[0068]Converter smelting: Add molten iron after desulfurization into the converter, add 20kg / t molten iron active lime, 15kg / t molten iron quartz sand, 15kg / t molten iron high magnesium lime and 3kg / t molten iron steelmaking sludge ball, single slag At the same time, oxygen is supplied by oxygen lance for blowing. 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 0.0018%. After the converter smelting is completed, the steel is tapped. When the t...

Embodiment 3

[0074] 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: 0.077%.

[0075] Converter smelting: add molten iron after desulfurization into the converter, add 18kg / t molten iron active lime, 13kg / t molten iron quartz sand, 13kg / t molten iron high magnesium lime and 2.5kg / t molten iron steelmaking sludge balls, single The slag method is used for smelting, and the 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 0.0022%. After the converter smelting is completed, ...

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Abstract

The invention discloses a smelting method for improving heavy rail steel cleanliness, and belongs to the technical field of iron and steel metallurgy. According to the smelting method for improving the heavy rail steel cleanliness, the technical problem that cleanliness of existing domestic heavy rail steel can difficultly meet the requirements of high-speed railways is solved. The smelting methodcomprises the steps of molten iron pretreatment, converter smelting, LF refining, RH refining and continuous casting, wherein calcium treatment is carried out by adopting an iron and calcium line with molten steel of 12-15 m/t in the step of LF refining. According to the smelting method for improving the heavy rail steel cleanliness, it is ensured that P is less than or equal to 0.0060%, S is less than or equal to 0.0030%, O is less than or equal to 0.0010%, N is less than or equal to 0.0050%, H is less than or equal to 0.00015%, the total amount of P and S and O and N and H is less than or equal to 160ppm, and various ratings of inclusions are less than or equal to 1.0 level in a steel rail, so that the heavy rail steel cleanliness is significantly improved, and the smelting method for improving the heavy rail steel cleanliness 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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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C5/28C21C7/06C21C7/10
CPCC21C7/0645C21C5/28C21C7/06C21C7/10
Inventor 陈亮陈天明李红光
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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