Welded tube for calorizing and laser short processing

A laser shock and aluminizing treatment technology, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of reducing the corrosion resistance of aluminized steel, the brittleness of high aluminum phase, the installation and construction of aluminized steel, etc. Achieve the effect of improving surface hardness, improving use mission and reducing service life

Inactive Publication Date: 2013-04-03
JIANGSU TONGYU STEEL PIPE GRP
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Problems solved by technology

[0003] (1) The outer layer is often composed of Fe 2 Al 5 、FeAl 3 The high aluminum phase is composed of high aluminum phase, and the high aluminum phase is more brittle, which will have adverse effects on the subsequent installation and construction of aluminized steel.
[0004] (2) During the high-temperature diffusion process of hot-dip aluminum steel, due to the Kirkendall effect, there are a large number of vacancies between the sub-outer layer and the transition layer of the diffusion layer to accumulate into holes. Even when the cooling rate is slow (air cooling), cracks will occur on the surface of the infiltrated layer, and defects such as holes and cracks will seriously reduce the corrosion resistance of aluminized steel

Method used

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  • Welded tube for calorizing and laser short processing
  • Welded tube for calorizing and laser short processing
  • Welded tube for calorizing and laser short processing

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specific Embodiment approach

[0021] In the present invention, the surface is heat-treated by hot-dip aluminizing, and Al atoms and Fe atoms in the matrix undergo a series of physical and chemical changes through convective diffusion and thermal diffusion, forming a Fe-Al alloy layer on the surface of the matrix. The alloy layer is divided into two layers: the outer pure aluminum layer and the middle metal compound. Fe and Al are fully infiltrated, and the original structure and properties of the matrix are well maintained, but the porosity is relatively high. After laser shock treatment, the porosity is significantly reduced, such as figure 1 , figure 2 As shown, the surface roughness is reduced and the wear resistance is good, and the corrosion resistance ability is improved, such as image 3 , Figure 4 shown.

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Abstract

The invention relates to a welded tube for calorizing and laser short processing. The welded tube is prepared from the following processing steps of carrying out thermal treatment on the surface of the welded tube in an aluminizing manner, wherein an Al atom and an Fe atom are subjected to physical and chemical change by convective diffusion and thermal diffusion to form a Fe-Al alloy layer at the surface of the welded tube, and then preparing the welded tube by laser shock processing. The welded tube disclosed by the invention is small in surface roughness and good in abrasive resistance.

Description

technical field [0001] The invention relates to a welded pipe treated with aluminizing treatment and laser shock treatment, in particular to a welded pipe of X70 pipeline steel which has undergone hot dip aluminization treatment and laser shock treatment. Background technique [0002] Hot-dip aluminizing is a surface modification technology that immerses pre-treated carbon steel in molten aluminum at a certain temperature, and after a certain period of time makes the surface of the pipeline steel form an impregnated aluminum layer, thereby achieving surface protection and surface strengthening. However, the aluminized layer obtained by this method often has the following disadvantages: [0003] (1) The outer layer is often composed of Fe 2 Al 5 、FeAl 3 The high aluminum phase is composed of high aluminum phase, and the high aluminum phase is more brittle, which will have adverse effects on the subsequent installation and construction of aluminized steel. [0004] (2) Dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C10/22C21D9/08C21D1/09
Inventor 孔德军方晓东
Owner JIANGSU TONGYU STEEL PIPE GRP
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