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Preparation method of high-strength hot-galvanized diphase steel for burner

A hot-dip galvanizing, high-strength technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of non-durability, easy to fall off, easy to lose zinc layer, etc., to eliminate environmental problems, investment Fewer and fewer processes

Inactive Publication Date: 2018-03-09
QINGDAO TIANDI CASTING CO LTD
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  • Description
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Problems solved by technology

Finally, galvanizing is to galvanize the surface of the steel plate, and the surface is bright silver. Generally, it is easy to fall off at the welding place, and the zinc layer is also easy to fall off, which is not durable. It is necessary in the application of the stove head

Method used

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Embodiment

[0012] A method for preparing a high-strength hot-dip galvanized dual-phase steel for a furnace head in this embodiment includes the following steps:

[0013] 1) Hot-rolling the slab to obtain hot-rolled strip steel: heat the slab to 1350°C, control the rolling start temperature at 1000°C, control the final rolling temperature at 875°C, multi-pass laminar cooling, and control the temperature at 580°C ;

[0014] 2) Hot-rolled steel strip is heated and reduced: in the heating furnace, the hot-rolled steel strip is heated to 800°C at a rate of 20°C / s for reduction annealing, and then the hot-rolled strip is placed in the reduction furnace for reduction reaction. The atmosphere is H 2 +N 2 , wherein the hydrogen volume concentration is 25%, and the heat preservation and reduction time is controlled to 300s;

[0015] 3) Immerse in a zinc pot and directly hot-dip galvanize;

[0016] 4) After skinning and coiling, the steel strip is cooled to room temperature by air cooling or fo...

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Abstract

The invention discloses a method for preparing a high-strength hot-dip galvanized dual-phase steel used in a furnace head. Using hot-rolled strip steel as a raw material, it breaks through the limitation of the addition range of Si and Mn elements on galvanized steel sheets, and avoids adding Elements such as Mo and Cr with high cost are beneficial to the development of economical galvanized dual-phase steel; and the hydrogen reduction reaction is carried out in the annealing furnace of the continuous hot-dip galvanizing production line, and then the direct hot-dip galvanizing is carried out, eliminating the need for pickling and In the cold rolling process, the process is reduced, the cost is reduced, and the environmental problems caused by pickling are eliminated; at the same time, the shortcomings of the existing process are overcome, and additional facilities and investment are not added. The invention has low investment, quick results, and convenient operation.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for preparing a high-strength hot-dip galvanized dual-phase steel used for a furnace head. Background technique [0002] At present, there are three materials of cast iron, enamel, and galvanized in the material of the furnace head. Cast iron is the most used material, which is integrally formed, strong in integrity, and high temperature resistant. It is easy to take care of, and the number of uses is second only to cast iron. Finally, galvanizing is to galvanize the surface of the steel plate, and the surface is bright silver. Generally, it is easy to fall off at the welding place, and the zinc layer is also easy to fall off, which is not durable. It is necessary in the application of the stove head. Contents of the invention [0003] In order to overcome the above-mentioned technical problems existing in the prior art, the object of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0247C23C2/06C23C2/40
Inventor 李玉敏
Owner QINGDAO TIANDI CASTING CO LTD
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