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Method for improving Cr yield of electric furnace

A yield and electric furnace technology, which is applied in the field of improving the Cr yield of electric furnaces, and can solve the problems of low Cr yield of electric furnaces and the like

Active Publication Date: 2020-10-23
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem that the yield rate of Cr in the existing electric furnace is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10t of steel was left in the last smelting furnace, 20kg / t of lime was added to the furnace, and a total of 45t of scrap steel and alloy materials were added to the electric furnace. At the same time, oxygen is blown into the furnace, and the oxygen blowing volume is 15m 3 / t steel, the oxygen pressure is 0.9Mpa. At the same time, in the bottom blowing gas mode in the smelting process: N is used from the beginning of blowing to 1 / 3 stage 2 , the flow is controlled at 0.2Nm 3 / t min; blowing 1 / 3~2 / 3 stage uses CO 2 , the flow is controlled at 0.32Nm 3 / t min; blowing 2 / 3 ~ pre-tapping stage using CO 2 Mixed gas with Ar, CO 2 The volume ratio to Ar is 4:1, and the flow rate is controlled to be 0.3Nm 3 / t·min. 1.2kg / t of carbon powder is added to the ladle at the stage of blowing 2 / 3~before tapping; then 1.8kg / t of ferrosilicon is added to the steel. During the slagging process, the basicity of steel slag is controlled at 2.9. The end point temperature is controll...

Embodiment 2

[0033] 10t of steel was left in the previous smelting furnace, 22kg / t of lime was added to the furnace, and 45t of scrap steel and alloy materials were added to the electric furnace. At the same time, oxygen is blown into the furnace, and the oxygen blowing volume is 16m 3 / t steel, the oxygen pressure is 1.1Mpa. At the same time, in the bottom blowing gas mode in the smelting process: N is used from the beginning of blowing to 1 / 3 stage 2 , the flow is controlled at 0.2Nm 3 / t min; blowing 1 / 3~2 / 3 stage uses CO 2 , the flow is controlled at 0.34Nm 3 / t min; blowing 2 / 3 ~ pre-tapping stage using CO 2 Mixed gas with Ar, CO 2 The volume ratio to Ar is 4:1, and the flow rate is controlled to be 0.4Nm 3 / t·min. 1.8kg / t of carbon powder is added to the ladle at the stage of blowing 2 / 3~before tapping; and then 2kg / t of ferrosilicon is added. During the slagging process, the basicity of steel slag is controlled at 3.0. The end point temperature is controlled at 1670°C.

[...

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Abstract

The invention belongs to the technical field of electric furnace steel making and particularly discloses a method for improving the Cr yield of an electric furnace. The method comprises the followingsteps that a, 10 t steel from last time smelting is reserved, lime, waste steel materials and alloy materials are added into the furnace, the waste steel materials are melted, carbon powder is added in the melting process, and meanwhile oxygen is blown into the furnace; b, gas is blown from the bottom in the smelting process, wherein N2 is adopted in the period from the beginning of blowing to theone-third stage; CO2 is adopted in the period from the one-third stage to the two-thirds stage of blowing; and mixed gas of CO2 and Ar is adopted in the period from the two-thirds stage of blowing tothe time before tapping, and the volume ratio of CO2 and Ar is 4:1; c, carbon powder is added into a steel ladle in the stage from two-thirds stage of blowing and the time before tapping; and then silicon iron is added; and d, the alkalinity of steel slags is controlled to be 2.8 to 3.2 in the slagging process, and the terminal temperature of smelting is controlled to be 1650 DEG C to 1680 DEG C.According to the method, by controlling the adding amount and the adding time of silicon iron in combination with control over bottom blowing, the Cr yield is improved.

Description

technical field [0001] The invention belongs to the technical field of electric furnace steelmaking, and in particular relates to a method for increasing the Cr yield of an electric furnace. Background technique [0002] Chromium is an important alloy of stainless steel, heat-resistant steel, alloy tool steel, and alloy structural steel. Chromium in steel can increase the hardenability of steel and improve the physical and chemical properties of steel. [0003] Since the smelting process of the electric furnace has been in an oxidizing atmosphere, the molten steel contains a large amount of oxygen, mainly in the form of FeO, which makes Cr oxidized, resulting in a low yield of Cr in the steel obtained by electric furnace smelting. Contents of the invention [0004] The purpose of the invention is to solve the problem of low Cr yield in the existing electric furnace. [0005] The technical scheme that the present invention solves the problems of the technologies described ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/00
CPCC21C5/527C21C7/0006C21C7/0025Y02P10/20
Inventor 陈路王建
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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