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Protection method of blast furnace cooling wall and protection coating

A protective coating and stave technology, applied in coatings, cooling devices, metal material coating processes, etc., can solve the problems of unfavorable steel cost, reduction, unfavorable energy saving and emission reduction, etc., to make up for poor high temperature oxidation resistance, Improvement of service life, effect of improving service life

Inactive Publication Date: 2013-11-20
山东金萃冶金技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the overall replacement is made of high-alloy materials or copper staves, although the above problems can be solved, it is not conducive to energy saving and emission reduction, nor is it conducive to the reduction of steel costs

Method used

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  • Protection method of blast furnace cooling wall and protection coating
  • Protection method of blast furnace cooling wall and protection coating
  • Protection method of blast furnace cooling wall and protection coating

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Embodiment Construction

[0036] The protection method of the stave of the blast furnace comprises the steps of:

[0037] a). The surface pretreatment of the blast furnace stave, removes the attachment on the stave surface, and at the same time roughens and activates the surface;

[0038] Further: In step a, the surface pretreatment of the stave is cleaned and roughened and surface activated by spraying 6-10 mesh SiC sand; any point value between 6-10 mesh is acceptable, such as 7 mesh, 8 mesh, 9 mesh etc.

[0039] b). A primer alloy layer is sprayed on the surface of the blast furnace stave; the alloy elements of the primer alloy layer include Al, Fe, Ni, and rare earth elements, and the mass percentages are: Al: 3-10%, Fe: 2-5%, Ni: 80-90%, rare earth elements: 2-5%;

[0040] The mass percentages of the above-mentioned alloying elements can be formed by arbitrarily taking point values ​​within their respective ranges for each of the above-mentioned elements, for example:

[0041] Al: 3%, Fe: 5%,...

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Abstract

The invention discloses a protection method of a blast furnace cooling wall. The protection method comprises the following steps of: (a) carrying out surface pretreatment on the blast surface cooling wall, removing attachments on the surface of the cooling wall and simultaneously roughening and activating the surface; (b) spraying and bottoming an alloy layer on the surface of the blast surface cooling wall, wherein the bottoming alloy layer comprise the alloy elements in percent by mass: 3-10% of Al, 2-5% of Fe, 80-90% of Ni and 2-5% of rare-earth elements; (c) spraying a working alloy layer on the surface of the bottoming alloy layer, wherein the working alloy layer comprises the alloy elements in percent by mass: 1-3% of Co, 18-30% of Cr, 10-20% of Mo, 2-6% of W, 2-5% of rare-earth elements and the balance of Ni; and (d) carrying out subsequent hole sealing treatment on the working alloy layer and the bottoming alloy layer. Under the premise of not influencing the capability of a base body of the cooling wall, a coating has the advantages of high hardness, high-temperature oxidation resistance, wear resistance and good thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of blast furnace staves, in particular to a blast furnace stave protective coating and a protective method. Background technique [0002] Corrosion, wear and protection have always been subjects of great concern in the industrial field. Blast furnace stave corrosion is a major problem in the metallurgical industry. Replacement of staves is time consuming and expensive. Therefore, the metallurgical departments of various countries regard the anticorrosion and maintenance of blast furnace staves as a major subject to study. [0003] The blast furnace stave is an important water-cooled part of the blast furnace lining. It is installed on the furnace shaft, furnace waist, furnace hearth, hearth and other parts of the blast furnace. It must have good thermal strength, thermal shock resistance, rapid cooling and rapid heat resistance and other comprehensive properties. The stave can effectively prevent the fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/10C23C4/08C23C4/12C23C4/131
Inventor 杨德良吕震
Owner 山东金萃冶金技术有限公司
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