Process for smelting and producing medium high carbon steel

A production process, medium and high carbon technology, applied in the direction of manufacturing converters, etc., can solve problems such as insufficient refining processing capacity, and achieve the effect of improving the ability to capture deoxygenation products

Inactive Publication Date: 2012-06-06
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: aiming at the shortcomings of the above existing technologies, a medium-high carbon steel smelting production process is proposed, which can replace the LF refining process of medium-high C steel, and solve the insufficient refining capacity in the fast-paced production of steelmaking problems, and the quality of molten steel meets the final performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is a smelting production process of medium-high carbon steel, and its production process route is: converter smelting-tapping deoxidation alloying--arr blowing station treatment-continuous casting pouring.

[0030] Converter smelting: metal materials are put into the furnace → oxygen is supplied for blowing → lime is added during the blowing process, ore is returned, dolomite slag is made → the end point P and S meet the requirements of the smelted steel type → steel is tapped from the converter to the ladle.

[0031] The deoxidation and alloying sequence of tapping is as follows: at 1 / 10 of the entire tapping time, silicon-aluminum-calcium alloy, low-melting point synthetic slag and alloyed alloys are sequentially added, and at 2 / 3 of the entire tapping time, all alloys are added; The addition amount of silicon-aluminum-calcium alloy is 3Kg / ton of steel; the addition amount of low-melting point synthetic slag is 5Kg / ton of steel;

[0032] The low meltin...

Embodiment 2

[0047] This embodiment is a smelting production process of medium-high carbon steel, and its production process route is: converter smelting-tapping deoxidation alloying-arr blowing station treatment-continuous casting pouring.

[0048] Converter smelting: metal materials are put into the furnace → oxygen is supplied for blowing → lime is added during the blowing process, ore is returned, dolomite slag is made → the end point P and S meet the requirements of the smelted steel type → steel is tapped from the converter to the ladle.

[0049] The deoxidation and alloying sequence of tapping is as follows: at 1 / 10 of the entire tapping time, silicon-aluminum-calcium alloy, low-melting point synthetic slag and alloyed alloys are sequentially added, and at 2 / 3 of the entire tapping time, all alloys are added; The addition amount of silicon-aluminum-calcium alloy is 3.5Kg / ton of steel; the addition amount of low-melting point synthetic slag is 6Kg / ton of steel;

[0050] The low melti...

Embodiment 3

[0066] This embodiment is a smelting production process of medium-high carbon steel, and its production process route is: converter smelting-tapping deoxidation alloying-arr blowing station treatment-continuous casting pouring.

[0067] Converter smelting: metal materials are put into the furnace → oxygen is supplied for blowing → lime is added during the blowing process, ore is returned, dolomite slag is made → the end point P and S meet the requirements of the smelted steel type → steel is tapped from the converter to the ladle.

[0068] The deoxidation and alloying sequence of tapping is as follows: at 1 / 10 of the entire tapping time, silicon-aluminum-calcium alloy, low-melting point synthetic slag and alloyed alloys are sequentially added, and at 2 / 3 of the entire tapping time, all alloys are added; The addition amount of silicon-aluminum-calcium alloy is 4Kg / ton of steel; the addition amount of low melting point synthetic slag is 7Kg / ton of steel;

[0069] Low melting point...

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PUM

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Abstract

The invention relates to a process for producing a steel, in particular to a process for smelting and producing a medium high carbon steel. The process comprises the steps of adding silicon aluminum calcium alloy, low-melting-point synthetic slag and alloyed alloy at the time of 1 / 10 of the whole tapping time in turn, ending the process of adding all the alloys at the time of 2 / 3 of the whole tapping time, blowing in Ar in the whole tapping process in order to turn the low-melting-point synthetic slag into emulsion droplet to be scattered into the molten steel, and blowing Ar into the molten steel for at least eight minutes after finishing tapping, wherein 3kg of silicon aluminum calcium alloy is added into a ton of steel; 5kg of low-melting-point synthetic slag is added into a ton of steel; 7-10.5 kg of high carbon in the alloyed alloy is added into a ton of steel; and 3.5kg of FeSi in the alloyed alloy is added into a ton of steel. The process of the invention can replace the medium high C steel LF refining treating process and solve the problem that the refining treating capability in the quick steel-making production is insufficient.

Description

technical field [0001] The invention relates to a steel production process, in particular to a medium-high carbon steel smelting production process. Background technique [0002] The smelting and production process route for producing medium-high C steel in the prior art is: converter smelting—deoxidation alloying when tapping reaches 1 / 3 (1 / 3 of the entire tapping time) → tapping to 2 / 3 (the entire tapping time 2 / 3) All deoxidized alloying alloys are added (without adding low melting point synthetic slag)--LF refining blowing Ar-continuous casting cast steel, in which the order of deoxidized alloying of steel is: alloyed alloy→deoxidized alloy (silicon-aluminum-calcium alloy). The disadvantages of this production method in the prior art are: the silicon and manganese in the alloying alloy participate in the deoxidation reaction, resulting in more silicate inclusions, which are not easy to remove. In addition, if the LF refining capacity is insufficient, the product quality...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/072
Inventor 胡道峰赵军翟卫江
Owner NANJING IRON & STEEL CO LTD
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