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Postweld heat treatment method for blast furnace five-way ball

A post-weld heat treatment, five-way ball technology, used in heat treatment furnaces, heat treatment equipment, heat treatment process control and other directions

Pending Publication Date: 2021-05-25
SHANGHAI ERSHIYE CONSTR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the defects of the prior art, provide a heat treatment method after ball welding of blast furnace five-way joints, and solve the problem of eliminating the residual stress of the welding seam

Method used

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  • Postweld heat treatment method for blast furnace five-way ball
  • Postweld heat treatment method for blast furnace five-way ball
  • Postweld heat treatment method for blast furnace five-way ball

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Embodiment Construction

[0017] A post-welding heat treatment method for blast furnace five-way balls, comprising the steps of:

[0018] First of all, place the test board in the temperate zone and place three test boards at intervals of 120° for synchronization. Set the temperature measuring point on the test board and thicken the insulation layer here to ensure that the temperature of the test board is the same as that of the spherical shell plate;

[0019] Secondly, before heat treatment, two holes with a size of not less than φ500 are opened in the spherical shell, and the opening positions at the position of the ascending pipe and the position of the descending pipe are selected, one for each place, as the air inlet and smoke exhaust port of the burner nozzle;

[0020] One of the openings must be placed at a lower position from the ground to facilitate the placement of heat treatment equipment during heat treatment, and the other as a smoke exhaust port, placed far away from flammable and explosiv...

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Abstract

The invention relates to a postweld heat treatment method for a blast furnace five-way ball. According to the postweld heat treatment method, a fuel oil system, an oil supply system, a measurement system, a column leg movement system and a smoke exhaust system are arranged; before heat treatment, two holes with the size not smaller than phi 500 are formed in a spherical shell, and the positions of the two holes select the position of an ascending pipe and the position of a descending pipe correspondingly according to a pattern to serve as an air inlet and a smoke outlet of a burner nozzle; and a fuel oil method is adopted for internal heating for heat treatment, specifically, the interior of a spherical tank is taken as a hearth, 0# diesel oil is selected as fuel, the exterior of the spherical tank is subjected to thermal insulation by using a thermal insulation material, fuel oil is sprayed inside and atomized through air supply of an air blower and a nozzle and is ignited through an electronic igniter, and the temperature of the spherical tank is raised to the temperature required by heat treatment under the convection conduction and flame heat radiation effects of high-temperature airflow generated by continuous combustion of the fuel oil on the inner wall of the spherical tank. The postweld heat treatment method adopts a multi-point heating and multi-point temperature control mode and has the advantages of being low in energy consumption, short in time, remarkable in effect and the like.

Description

technical field [0001] The invention relates to the field of blast furnace steel structure installation, in particular to a post-ball welding heat treatment method for blast furnace bottom joints. Background technique [0002] There are many steel spherical tanks involved in the ironmaking system of the modern metallurgical industry, but there are not many ways to eliminate residual stress after welding the spherical tanks. The purpose of the post-welding heat treatment of the steel spherical tank is to eliminate the residual stress of the spherical tank after welding and ensure safe use. It provides an important technological means and is also the last process after the steel spherical tank is manufactured. This article focuses on the effect of heat treatment on steel spherical tanks after welding and the principle of eliminating residual stress. Taking Shandong 5100m3 blast furnace five-way ball as an example to illustrate the method of eliminating residual stress after we...

Claims

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Application Information

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IPC IPC(8): C21D9/50C21D1/52C21D1/30C21D3/06C21D11/00
CPCC21D9/50C21D1/52C21D1/30C21D3/06C21D11/00
Inventor 肖朝全
Owner SHANGHAI ERSHIYE CONSTR CO LTD
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