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Insertion tube of vacuum cycle degassing refining furnace and preparation method thereof

A technology of vacuum circulation degassing and inserting tubes, which is applied in the vacuum circulation degassing refining furnace (i.e. field, can solve the problems of deterioration of high temperature performance, cracking and peeling of casting layer, etc., to reduce slag invasion and sticky slag, prolong service life, The effect of good thermal shock resistance

Inactive Publication Date: 2013-05-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have not completely solved the problem that cracks are generated due to the thermal shock of rapid cooling and heating at the lower part of the insertion tube, and then the crack propagation deteriorates the high-temperature performance, resulting in cracking and peeling of the casting layer.

Method used

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preparation example Construction

[0023]According to another aspect of the present invention, there is provided a method for preparing an insert pipe of a vacuum circulation degassing refining furnace. The preparation method includes the following steps: forming a cylindrical steel structure with a flange on the upper part, and forming a plurality of cat's claws distributed along multiple angles on the outer wall of the steel structure; Bricks; cast on the outer wall of the steel structure to form a first cast layer and a second cast layer distributed up and down, wherein the first cast layer is in contact with molten steel during vacuum cycle degassing and refining, and by weight percentage, the The first casting layer is composed of uniformly mixed 1% to 3% nano-zirconia powder, 2% to 4% alumina hollow spheres, 2% to 3% silica micropowder, and 1.5% to 2.0% alumina acid Calcium cement (preferably, it can be calcium aluminate cement of grade 70 or above), 0.1-0.2% of external water reducing agent, 1%-1.5% of s...

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Abstract

The invention provides an insertion tube of a vacuum cycle degassing refining furnace and a preparation method thereof. The insertion tube comprises a tubular steel structure, refractory bricks built on the inner wall of the steel structure and a pouring layer formed on the outer wall of the steel structure, wherein the pouring layer includes first and second pouring layers distributed up and down; the first pouring layer is contacted with molten steel when undergoing vacuum cycle degassing refining and contains 1-3% of nano zirconia powder and 2-4% of alumina hollow balls by weight; and the second pouring layer is not contacted with the molten steel when undergoing vacuum cycle degassing refining. The insertion tube is provided with the pouring layer with components and high temperature performance changing in a gradient manner, thus the insertion tube has good thermal shock resistance and longer service life.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace refining in metallurgical production, and more specifically, to an insertion tube of a vacuum circulation degassing refining furnace (ie, RH furnace) and a preparation method thereof. Background technique [0002] In 1957, German Thyssen Steel Company invented the vacuum cycle degassing-RH method. In the 1970s and 1980s, Japan successively developed the RH-OB method, RH-KTB method and RH-PB method, and continuously improved the refining of RH. Features. With the continuous expansion of RH refined steel types, it has established its dominant position in out-of-furnace refining. Most steel mills at home and abroad are equipped with RH refining devices. The RH insertion tubes are used under harsh conditions during use, especially the outer layer castables are easily damaged, which directly affects the service life of the RH insertion tubes and the production efficiency of the refining equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C04B35/66
Inventor 李龙戈文荪陈永童贤强李桂军杨森祥雷辉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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