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RH refining furnace, insertion tube thereof and preparation method

A technology of inserting tubes and refining furnaces, which is applied in the field of out-of-furnace refining in metallurgical production. It can solve the problems of crack propagation, deterioration of high-temperature performance, cracking and peeling of the pouring layer, etc., and achieve the goals of reducing slag invasion, reducing slag sticking and prolonging service life. Effect

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] However, none of the above-mentioned technologies has completely solved the problem that the lower part of the insertion tube is subjected to the thermal shock of rapid cooling and rapid heating to cause cracks, and then the crack propagation deteriorates the high-temperature performance, resulting in cracking and peeling off of the casting layer.

Method used

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preparation example Construction

[0020] According to another aspect of the present invention, there is provided a method for preparing an insert pipe of an RH refining furnace. The preparation method includes the following steps: forming a cylindrical steel structure; building refractory bricks on the inner wall of the steel structure; pouring on the outer wall of the steel structure to form a lower casting layer and an upper casting layer in contact with each other, wherein the upper casting Layer is not in contact with molten steel when carrying out vacuum circulation degassing refining; the lower casting layer is in contact with molten steel when carrying out vacuum circulation degassing refining, and by weight percentage, the said lower casting layer is composed of the upper casting layer Composition of the same ingredients and 1.0% to 4.0% of nano zirconium dioxide powder and 2.0% to 5.0% of alumina hollow spheres. Here, the refractory bricks may be magnesia-chrome bricks, and common castables may be fil...

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Abstract

The invention provides an RH refining furnace, an insertion tube thereof and a preparation method. 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 lower and upper pouring layers contacted with each other; the upper pouring layer is not contacted with molten steel when undergoing vacuum cycle degassing refining; and the lower pouring layer is contacted with the molten steel when undergoing vacuum cycle degassing refining and comprises 1.0-4.0% of nano zirconia powder, 2.0-5.0% of alumina hollow balls and the balance of components the same as the components of the upper pouring layer. 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 present invention relates to the technical field of refining outside the furnace in metallurgical production, and more specifically, relates to a RH refining furnace (that is, a vacuum circulation degassing refining furnace, referred to as RH furnace), an insertion tube 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 inserti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10
Inventor 李龙陈永陈天明陈炼李扬洲李桂军杨森祥王军杜利华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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