Dephosphorizing process of electric furnace steel making

A technology of electric furnace steelmaking and furnace charge, which is applied in the field of iron and steel metallurgy, can solve the problems of extended electric furnace smelting time, large consumption of electric energy and lime, and reduced production efficiency, and achieve the effects of shortening the smelting cycle, reducing costs, and broad application prospects

Inactive Publication Date: 2011-11-23
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the production of low-phosphorus steel has been realized, multiple slag removal and lime addition will not only consume a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1 Using the method of the present invention to produce dephosphorized molten steel

[0031] The 70-ton high-impedance ultra-high-power electric arc furnace adopts the method of the present invention to produce 30CrMo (steel for high-pressure gas cylinder tubes). The process steps are as follows:

[0032] a. Eccentric bottom steel and slag (the eccentric bottom steel and slag is that the tap hole is not at the center of the furnace bottom, but a distance away from the center of the furnace bottom, which is convenient for slag-free tapping) After tapping, add scrap steel to the electric furnace 61.34t (including 6.81t of pig iron), mixed with 1500Kg of lime to make slag, mixed with 23.4t of molten iron.

[0033] b. Power supply, using 3 oxygen burners to accelerate the melting of metal charge. The power of each burner is 3.5MW, the metal charge is melted by 50-60%, and 2000Kg of lime is added to make slag.

[0034] c. When the molten steel temperature reaches 1500~1550℃, ...

Example Embodiment

[0038] Example 2 Using the method of the present invention to produce dephosphorized molten steel

[0039] The 70-ton high-impedance and ultra-high-power electric arc furnace adopts local art to produce WB36CN1 (steel for nuclear power tubes). The process steps are:

[0040] a. Eccentric bottom steel and slag (the eccentric bottom steel and slag is that the tap hole is not at the center of the furnace bottom, but a distance away from the center of the furnace bottom, which is convenient for slag-free tapping) After tapping, add scrap steel to the electric furnace 62.64t (including 5t pig iron), mixed with 1800Kg of lime to make slag, mixed with 21t of molten iron.

[0041] b. Power supply, using 3 oxygen burners to accelerate the melting of metal charge. The power of each burner is 3.5MW, the metal charge is melted by 50-60%, and 2000Kg of lime is added to make slag.

[0042] c. When the bath temperature reaches 1500~1550℃, blow oxygen for 10 minutes, oxygen pressure 1.2~1.4Mpa, oxyge...

Example Embodiment

[0046] Example 3 Using the method of the present invention to produce dephosphorized molten steel

[0047] The 70-ton high-impedance and ultra-high-power electric arc furnace uses this art to produce 27CrMo (steel for petroleum pipes). The process steps:

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Abstract

The invention relates to a dephosphorizing process of electric furnace steel making, belonging to the field of ferrous metallurgy. The invention provides a dephosphorizing process of electric furnace steel making low cost, comprising a step of slag discharge, and the molten steel temperature is more than 1560 DEG C during the step of slag discharge. Compared with dephosphorizing processes existedin the prior art, the dephosphorizing process disclosed in the invention has no need of adding dephosphorization agent to strengthen dephosphorization, only needs the step of slag discharge once, andthe quantity of slag can be reduced by more than 30%, the smelting cycle can be reduced by more than 5%, thus greatly reducing the cost of dephosphorization in steel-making. The invention provides a novel method for dephosphorization in steel-making, with a wide application prospect.

Description

technical field [0001] The invention relates to an electric furnace steelmaking dephosphorization method, belonging to the field of iron and steel metallurgy. Background technique [0002] In recent years, users' demand for pure steel is increasing. The reduction of impurity elements such as phosphorus and sulfur in steel is the main content of steelmaking process research. Phosphorus is easy to segregate at grain boundaries, causing low temperature brittleness and temper brittleness of steel. Therefore, high-grade high-quality pipeline steel and low-temperature steel have increasingly strict requirements on phosphorus content in steel, and the requirement for w(p) in steel is less than 0.010%, or even less than 0.005%. [0003] At present, in order to improve the quality of products in the production of ultra-high-power electric arc furnaces, a part of molten iron or pig iron is used as raw materials to replace scrap steel for smelting, and pig iron and molten iron (witho...

Claims

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Application Information

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IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 王海兵苏雄杰黄国玖张珉王鑫
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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