High-efficient long-life pre-perforating pipe cast iron cooling wall and manufacturing process thereof

Abstract

The invention provides a high-efficient long-life pre-perforating pipe case iron cooling wall and a manufacturing method thereof. The high-efficient long-life pre-perforating pipe case iron cooling wall comprises a cast iron cooling wall body and a pre-perforating water pipe, wherein the pre-perforating water pipe comprises an outer-layer steel pipe casted into the cooling wall body, and an inner-layer water pipe pre-perforated into the outer-layer steel pipe; and the inner-layer water pipe is a seamless steel pipe or a copper pipe or a stainless steel pipe. With the pre-perforating water pipe, the defects of poor cooling effect, short service life, high cost and difficulty in operation caused after a cooling water pipe is damaged on a conventional cooling wall and a thin-wall metal corrugated pipe is re-perforated into the damaged water pipe are overcome; and the defects that the cooling wall is directly scraped and the safety production of a blast furnace is severely influenced sincethe thin-wall metal corrugated pipe cannot be perforated into the damaged S-shaped water pipe in the cooling wall are overcome. The cooling wall body and the outer-layer steel pipe form metallurgicalbonding, so that a coating heat barrier formed by a ceramic coating of the conventional cooling wall and an air gap heat barrier formed by an air gap layer are eliminated, the comprehensive heating-conducting property is improved by more than 3 times, and the service life of the cooling wall is prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment, in particular to a manufacturing process of high-efficiency and long-life pre-piercing cast iron staves. Background technique [0002] The existing cast iron cooling staves used at home and abroad are often damaged and leaked due to the water pipes cast into the cooling staves, causing the cooling staves to lose their cooling capacity and affecting the production safety of the blast furnace. In order to save the damaged stave, after the water pipe of the cast iron stave is damaged, it can only be repaired by inserting a thin-walled metal bellows into the damaged stave pipe on site, so as to maintain the cooling capacity of the water pipe and restore the function of the stave . However, the remedial metal bellows has a poor cooling effect, and the service life is generally 1-5 months. Moreover, the water flow resistance is large, which increases energy consumption, and the on-site...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a high-efficiency and long-life pre-piercing cast iron cooling wall and its manufacturing process, so as to solve the problem caused by the casting water pipe of the cast iron cooling wall in the background technology after the use of the blast furnace is damaged, or because it cannot be remedied by piercing the metal pipe. The stave is scrapped directly, or the service life of the cast iron stave is too short due to penetration into the thin-walled metal bellows, which fails to achieve the purpose of prolonging the service life of the cast iron stave

And because of the thermal barrier of the coating and the thermal barrier of the air gap on the outer surface of the cast-in water pipe, the temperature of the stave body is too high, and the matrix cracks, falls off, and is eroded by blast furnace slag and iron prematurely.

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