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Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation

A heat-resistant steel, water vapor technology

Inactive Publication Date: 2008-07-23
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, only when the Cr content in the base metal is higher than about 22.5% can a complete protective Cr 2 o 3 , when the Cr content is low, a stable protective film cannot be formed

Method used

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  • Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation
  • Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation
  • Method for improving resistant property of heat resistant steel for high-temperature water vapour oxidation

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] In the present invention, the surface of the heat-resistant steel to be treated is subjected to laser surface remelting treatment, so that the surface layer of the heat-resistant steel is 10 3 ~10 7 ℃ / s above the rate of heating and melting, and then 10 3 The cooling rate above ℃ / s solidifies, and a fine-grained region with a grain size below 25 μm is formed on the surface of the heat-resistant steel. The resistance to high temperature water vapor oxidation is improved through defects such as high-density grain boundaries, subgrain boundaries, dislocations, and vacancies of the treatment layer.

[0026] In order to further improve the steam oxidation resistance of the laser remelted layer on the heat-resistant steel surface, a coating containing Cr, Al or Si elements is formed on the heat-resistant steel surface by pretreatment before the laser surfa...

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Abstract

The invention relates to a method to improve the anti-oxidation performance of refractory steel in high temperature steam atmosphere, which is characterized in that: the surface of refractory steel waiting for treatment is conducted laser surface remelting treatment; the temperature of the surface of refractory steel rises quickly above the melting point and the refractory steel melts; then the refractory steel is freezed with the cooling rate of above 103 DEG C / s; the properties of quick heating and quick cooling of laser surface remelting is utilized to form the steel surface into a fine-grain region with the grain size smaller than 25 Mum; the lattice defects of high-density grain boundary, sub-boundary, twin boundary, dislocation and vacancy in the treatment layer are utilized to promote the diffusion of elements such as Cr and Si, thus improving the anti-oxidation performance in high temperature steam atmosphere.

Description

technical field [0001] The invention relates to a method for improving the anti-high temperature water vapor oxidation performance of water vapor or a mixed atmosphere containing water vapor in the fields of thermal power plants, chemical industry, fuel cells, etc., in particular to a method for improving the high temperature resistance of heat-resistant steel Methods for water vapor oxidation properties. Background technique [0002] In the field of thermal power generation, as people pay more and more attention to energy conservation and environmental protection, the parameters of the unit are continuously improved to improve unit efficiency and reduce pollutant emissions per unit of power generation. However, with the increase of steam parameters, especially the steam temperature, a large number of high-temperature steam components in the unit, such as superheaters, reheaters, high-temperature steam pipes, turbine rotors, blades, high- and high-pressure internal cylinders...

Claims

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Application Information

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IPC IPC(8): C21D10/00C21D11/00
Inventor 周荣灿唐丽英王弘喆张红军于在松
Owner XIAN THERMAL POWER RES INST CO LTD
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