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A method of improving the service life of rh insertion tube

A technology of inserting tubes and life, which is applied in the field of iron and steel smelting, can solve the problems of spray guns not being able to handle, and achieve the effect of increasing the upper limit, increasing the range of gun spraying and gunning, and reducing the life expectancy

Active Publication Date: 2020-07-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing spray gun can’t handle the space between the two ring bricks in the middle of the circulation pipe, and the upper limit position of the spray gun travels to the upper edge of the insertion pipe

Method used

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  • A method of improving the service life of rh insertion tube
  • A method of improving the service life of rh insertion tube
  • A method of improving the service life of rh insertion tube

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings of the specification, but it should be pointed out that the implementation of the present invention is not limited to the following embodiments.

[0023] A method for improving the service life of the RH insertion tube 3 includes the following steps:

[0024] 1) When inserting the tube 3 online within 80 times: the carbon content of the molten steel produced> For 0.03% steel grades, one gunning cycle can process ≤7 cans of molten steel; to produce steel grades with carbon content ≤0.03%, one gunning cycle can process ≤6 cans of molten steel;

[0025] When the online insertion tube is used more than 80 times: the carbon content of the molten steel produced> For 0.03% steel grades, one gunning cycle will process ≤5 cans, and no steel grades with carbon content ≤0.03% will be produced;

[0026] 2) When the newly inserted tube 3 is used for the first time, heat the vacuum chamber fo...

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Abstract

The invention relates to a method for prolonging the service life of an RH insertion tube. The method comprises the following steps: 1) when an on-line insertion tube is used no more than 80 times, producing the type of steel with the carbon content of molten steel being more than 0.03%, wherein no more than 7 tanks of molten steel is treated in one gunning period, and producing the type of steelwith the carbon content of molten steel being no more than 0.03%, wherein no more than 6 tanks of molten steel is treated in one gunning period; and when the on-line insertion tube is used more than 80 times, producing the type of steel with the carbon content of molten steel being more than 0.03%, wherein no more than 5 tanks of molten steel is treated in one gunning period and the production ofthe type of steel with the carbon content of molten steel being no more than 0.03% is not implemented; and 2) when a new insertion tube is used for the first time, subjecting a vacuum chamber to online heating for more than 0.5 h before the treatment of molten steel, with heating temperature being 950 DEG C or above, and performing tank sticking operation 3-4 times during treatment of molten steelso as to prevent the influence of quenching and rapid heating on a refractory material. The method has the advantage of capacity of improving the service life of the RH insertion tube and enhancing RH operation rate, and reducing refractory cost per ton of steel.

Description

Technical field [0001] The invention belongs to the field of steel smelting and relates to a method for improving the service life of an RH insertion tube. Background technique [0002] The RH process of our plant is complex. It not only produces low-carbon and ultra-low-carbon raw materials for cold rolling, but also produces low-alloy and alloy steels for medium and heavy plate production lines such as pipelines, bridges, boiler pressure vessels, nuclear power and hydropower. Therefore, RH not only has a high operating rate, but also severely corrodes the insertion tube. The life of the insertion tube is generally less than 100 times. At present, the main measures to improve the life of the insertion tube are: observe the status of the insertion tube after production, and decide whether to perform gunning operations according to the status of the insertion tube. Using mechanical and manual dual gunning, machine gunning can repair a large area of ​​the insertion tube, but the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10
CPCC21C7/10
Inventor 苏小利于海岐邢维义吕志勇王金辉陈付振
Owner ANGANG STEEL CO LTD
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