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Converter vacuum steelmaking method

A converter and vacuum technology, applied in the field of iron and steel metallurgy, can solve the problems of small production batch, large inspection workload and high price, and achieve the effects of reducing non-metallic inclusions, improving work efficiency and speeding up reaction speed.

Inactive Publication Date: 2013-04-24
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the following disadvantages: 1) The equipment is complex, expensive, and large investment; 2) Maintenance is inconvenient, the cost of smelting is high, and the cost is relatively high; 3) The crucible refractory material pollutes the metal during the smelting process; 4) The production batch is small, and the inspection The workload is large, and it is difficult to apply to large-scale industrial production

Method used

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Examples

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the examples, but not limited thereto.

[0016] A method for vacuum steelmaking in a converter, the method comprising the steps of:

[0017] 1) Shake the converter to the iron mixing position, the converter is tilted forward by 15-20°, and the converter is gradually tilted down according to the inclination of the ladle during normal iron mixing;

[0018] 2) After adding iron, shake the converter to zero position, and the oxygen lance is in a non-working state;

[0019] 3) The converter is tilted forward by 20-30° to add steel scrap;

[0020] 4) Shake the converter to the blowing position, turn on the vacuum device, and the pressure drop above the molten steel inside the converter is 1.33×10 -1 ~133.3Pa;

[0021] 5) The oxygen-lowering lance is ignited below the oxygen opening point, and the lance is gradually lowered to the smelting lance position, the oxygen supply time is controlled at 12-15 ...

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Abstract

The invention relates to a converter vacuum steelmaking method comprising the steps that: the converter is leaned forward by 15-20 DEG, and iron blending is carried out; the converter is leaned forward by 20-30 DEG, and scrap steel is added; the converter is swung to a blowing position; a vacuuming device is started; the pressure above molten steel in the converter is reduced to 1.33*10<-1> Pa to 133.3Pa; oxygen blowing and smelting are carried out; the vacuuming device is turned off, and sampling and temperature measuring are carried out; and furnace turning and discharging are carried out. With the method, contents of gases such as nitrogen, hydrogen, oxygen, and the like in molten steel can be effectively removed, such that decarbonization and deoxidation reactions can be promoted, metal and non-metal impurities can be reduced, molten steel purity can be improved, and product quality can be improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular, the invention relates to a method for vacuum steelmaking in a converter. Background technique [0002] In recent years, my country's automobile, shipbuilding, container, petrochemical, electrical and other industries have a strong demand for high-quality steel. With the increasingly fierce market competition for steel products (especially high value-added products), many steel mills have established large-scale production of ultra-pure steel (total impurities in steel) in order to enhance product competitiveness, improve steel purity, and improve steel performance. Quantity: S+P+N+H+O≤100×10 -6 ) production system. [0003] Converter steelmaking is in the middle of ironmaking and steel rolling, and the ironmaking process is restricted by the supply of hot metal from the blast furnace; the steel rolling process must meet the quality requirements of steel rolling....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/10C21C7/072
CPCY02P10/20
Inventor 马琳王博刘化军许荣昌陈雷陈颜
Owner LAIWU IRON & STEEL GRP
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