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Method for prolonging 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, improving the RH operation rate, and increasing the quantity

Active Publication Date: 2019-01-22
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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  • Method for prolonging service life of RH insertion tube
  • Method for prolonging service life of RH insertion tube
  • Method for prolonging 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, 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, comprising the following steps:

[0024] 1) When the online insertion pipe 3 is used within 80 times: for the production of steel grades with a carbon content of molten steel > 0.03%, one gunning cycle treats ≤ 7 cans of molten steel; for the production of steel grades with a carbon content of molten steel ≤ 0.03%, one gunning cycle Handle ≤6 tanks of molten steel;

[0025] When the online insertion pipe is used more than 80 times: produce steel grades with a carbon content of > 0.03% in molten steel, process ≤ 5 cans in one gunning cycle, and do not produce steel grades with a carbon content of ≤ 0.03%;

[0026] 2) When the new insertion tube 3 is used for the first time...

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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 iron and steel smelting, and relates to a method for increasing the service life of an RH insertion tube. Background technique [0002] The RH processing steel types in our factory are complicated. We not only produce low-carbon and ultra-low-carbon raw materials for cold rolling, but also produce low-alloy and alloy steel types 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 seriously corrodes the insertion tube. The life of the insertion tube is generally below 100 times. At present, the main measures to extend the life of the insertion tube are: observe the status of the insertion tube after production, and decide whether to carry out gunning according to the status of the insertion tube. Double gunning of mechanical and manual is adopted. Machine gunning can repair a large ...

Claims

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Application Information

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Patent Type & Authority Applications(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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