Smelting method for improving heavy rail steel cleanliness

A smelting method and cleanliness technology, which is 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, and achieve the goals of improving fatigue performance and mechanical properties, controlling nitrogen content, and improving cleanliness Effect

Inactive Publication Date: 2018-11-13
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

[0065] 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%.

[0066] Converter smelting: Add molten iron after desulfurization into the converter, add active lime of 7kg / t molten iron, quartz sand of 8kg / t molten iron and high-magnesium lime of 10kg / t molten iron as the first slagging materials, and supply oxygen with oxygen lance at the same time For blowing, the blowing lance position of the oxygen lance is controlled at 1.5-2.5m, the temperature of the blowing process is 1655°C, and the second slagging material 10kg / t molten iron active lime, 10kg / t Quartz sand of molten iron and high-magnesia lime of 10kg / t molten iron, after continuous blowing for 5 minutes, slag is dumped and then s...

Embodiment 2

[0072] 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%.

[0073] Converter smelting: Add molten iron after desulfurization into the converter, add active lime of 10kg / t molten iron, quartz sand of 7kg / t molten iron and high-magnesium lime of 9kg / t molten iron as the first slagging materials, and supply oxygen with oxygen lance at the same time For blowing, the blowing lance position of the oxygen lance is controlled at 1.5-2.5m, the temperature of the blowing process is 1658°C, and the second slagging material 10kg / t molten iron active lime, 10kg / t Quartz sand of molten iron and high-magnesia lime of 10kg / t molten iron, after continuous blowing for 8 minutes, slag is dumped and then s...

Embodiment 3

[0079] 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%.

[0080] Converter smelting: add molten iron after desulfurization into the converter, add active lime of 8kg / t molten iron, quartz sand of 8kg / t molten iron and high-magnesium lime of 8kg / t molten iron as the first slagging materials, and supply oxygen with oxygen lance at the same time For blowing, the blowing lance position of the oxygen lance is controlled at 1.5-2.5m, the temperature of the blowing process is 1653°C, and the slag is poured after 9 minutes of blowing, and then the second slagging material 8kg / t of active lime of molten iron, 8kg / t of molten iron are added Quartz sand of molten iron and high-magnesia lime of ...

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Abstract

The invention discloses a smelting method for improving the heavy rail steel cleanliness, and belongs to the technical field of iron and steel metallurgy. The invention solves the technical problem that the existing domestic heavy rail steel cleanliness is hard to meet the requirement of high-speed railways. The method comprises the steps of pretreating hot metal, smelting through a converter, LFrefining, RH refining and continuous casting, wherein during the process of smelting through the converter, hot metal is blown by adopting a double slag process, and the dosage of active lime of a first-time slag making material is 5 to 20kg / t of hot metal; the dosage of quartz sand is 5 to 10kg / t of hot metal; the dosage of high-magnesium lime is 5 to 10kg / t of hot metal; the dosage of active lime of a second-time slag making material is 5 to 10kg / t of hot metal; the dosage of quartz sand is 5 to 10kg / t of hot metal; and the dosage of high-magnesium lime is 5 to 10kg / t of hot metal. Accordingto the method provided by the invention, the (P+S+O+N+H) can be controlled to be less than or equal to 160ppm, the various grades of the occluded foreign substances are less than or equal to 1.0 grades, the heavy rail steel cleanliness is remarkably improved, and a certain social benefit is achieved.

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): C21C7/064C21C5/28C21C7/06C21C7/076C21C7/10
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06C21C7/0645C21C7/076C21C7/10Y02P10/20
Inventor 陈天明陈亮李红光
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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