RH deep decarbonization and clean steel smelting method

A smelting method and technology for cleaning steel, applied in the field of steelmaking and continuous casting, which can solve the problems of rapid hydrogen diffusion, high safety requirements for injection systems, and easy fire and explosion.

Active Publication Date: 2017-01-04
ANGANG STEEL CO LTD
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Problems solved by technology

However, hydrogen is a low-density gas. When the proportion of hydrogen in the air is 13%-59%, it will form an explosive mixed gas. Once hydrogen le

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0015] The present invention is further illustrated by some examples below.

[0016] For example, using this technology to produce ultra-low carbon IF steel, the process is carried out in sequence as follows:

[0017] (1) After the molten steel enters the RH station, the molten steel weight is 255t, the molten steel temperature is 1605°C, the molten steel oxygen content is 0.064%, and the molten steel carbon content is 0.042%. After that, it is evacuated, the lifting gas is argon, and the gas flow is 140Nm 3 / h, blow in oxygen 100m at the 3rd minute of vacuuming 3 .

[0018] (2) Sampling at the 15th minute of RH refining, the carbon content in the molten steel was detected to be 0.0029%. At this time, the moisture content in the argon gas was 0.0015% according to the dew point meter, and an industrial humidifier was used to humidify the lifting gas. After humidification The moisture content in the lifting gas is 50%, the hydrogen content of molten steel is detected to be 0.0021% dur...

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Abstract

The invention discloses a RH deep decarbonization and clean steel smelting method. The RH deep decarbonization and clean steel smelting method comprises following steps: oxygen blowing is finished in 5min of refining; when molten steel carbon content is 0.0030% or lower, water content of a lifting gas is detected, and the lifting gas is subjected to humidification treatment so as to control the water content of the lifting gas to be 10 to 50%, and hydrogen content of molten steel to be 0.0005 to 0.0025%, and then molten steel is subjected to circulation for 15 to 30min; when molten steel carbon content is 0.0010% or lower, humidification treatment of the lifting gas is stopped, a deoxidizing agent is added for deoxidizing of molten steel, and molten steel is subjected to circulation for another 10 to 30min; temperature measuring is carried out; oxygen determination is carried out; hydrogen determination is carried out; and steel tapping is carried out.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and particularly relates to a RH deep decarburization and clean steel smelting method. Background technique [0002] The RH refining process is the most important of many refining methods outside the furnace. It has a series of advantages such as short processing period, large production capacity, good refining effect, and easy operation. It has been widely used in steelmaking production. At present, RH is the main The function has been changed from the original single degassing equipment to multifunctional refining equipment outside the furnace including vacuum decarburization, oxygen blowing decarburization, powder spraying desulfurization, temperature compensation, uniform temperature and composition, etc. It is used in the production of ultra-low carbon steel, high-quality clean Steel has shown a significant advantage. [0003] At present, the deep decarburization and ...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/068C21C7/06
CPCY02P10/20
Inventor 赵成林廖相巍常桂华张宁黄玉平
Owner ANGANG STEEL CO LTD
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