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Preparing method for medium-chromium-based ferritic stainless steel low power structure

A technology of low-magnification microstructure and stainless steel, which is applied in the preparation of test samples, etc., can solve the problems of unstable corrosion effect of ferritic stainless steel, no method of ferritic stainless steel corrosion, and difficulty in effectively observing low-magnification microstructure. The crystal grains are clearly visible, avoiding intergranular corrosion, and inhibiting the effect of intergranular corrosion

Inactive Publication Date: 2017-02-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature search found that, in the above-mentioned technical solutions, although the technical solutions of related steel etchants are disclosed, no special etchant has been developed for medium chromium-based ferritic stainless steel. The corrosion method applied to medium chromium-based ferritic stainless steel results in unstable corrosion effect of the etchant on medium chromium-based ferritic stainless steel, and it is difficult to effectively observe the low-magnification structure of medium-chromium-based ferritic stainless steel. problem needs to be solved

Method used

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  • Preparing method for medium-chromium-based ferritic stainless steel low power structure
  • Preparing method for medium-chromium-based ferritic stainless steel low power structure
  • Preparing method for medium-chromium-based ferritic stainless steel low power structure

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Embodiment 1

[0048] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, a medium-chromium-based ferritic stainless steel etchant of this embodiment is used for the preparation process of the low-magnification solidification structure of medium-chromium-based ferritic stainless steel, and the chromium of medium-chromium-based ferritic stainless steel The content is 16%-18%, and the etching agent is composed of ethanol, nitric acid, hydrochloric acid and distilled water, and the volume ratio of ethanol: nitric acid: hydrochloric acid: distilled water is 1:1:2:2, that is, the volume fraction of each component It is: 50 parts of ethanol, 50 parts of nitric acid, 100 parts of hydrochloric acid, and 100 parts of distilled water. Wherein: ethanol, nitric acid, and hydrochloric acid are all analytically pure, that is, the concentration of ethanol is 95%, the concentration of nitric acid is 65%, and the concentration of hydrochloric acid is 36%.

[0049] In this embodiment, taking ...

Embodiment 2

[0080] The basic content of this embodiment is the same as that of Embodiment 1, except that: the slab of medium chromium-based ferritic stainless steel 439 stainless steel is taken as an example, and the 439 stainless steel is etched, wherein the chromium content is 17.90%. The slab is wide, and its "width x thickness" is "1250 mm x 200 mm". Since the board is wider, the board is divided into three sections, and this embodiment is one of the three sections of the board.

[0081] The etching agent includes: ethanol, nitric acid, hydrochloric acid and distilled water, and the parts by volume of each component are: 25 parts of ethanol, 25 parts of nitric acid, 50 parts of hydrochloric acid, and 50 parts of distilled water.

[0082] A method for preparing a low-magnification structure of a medium-chromium-based ferritic stainless steel in this embodiment comprises the following steps:

[0083] Step 1. Preparation of etchant

[0084] (1) Preparation of nitric acid ethanol mixed ...

Embodiment 3

[0100] The basic content of this embodiment is the same as that of Example 1, except that the etching agent includes: ethanol, nitric acid, hydrochloric acid and distilled water, and the parts by volume of each component are: 10 parts of ethanol, 20 parts of nitric acid, and 20 parts of hydrochloric acid. 50 parts, 50 parts of distilled water.

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Abstract

The invention discloses a preparing method for a medium-chromium-based ferritic stainless steel low power structure, and belongs to the technical field of medium-chromium-based ferritic stainless steel structure preparing. An erosion agent comprises, by volume, 10-80 parts of ethyl alcohol, 20-90 parts of nitric acid, 50-100 parts of hydrochloric acid and 50-200 parts of distilled water. The preparing method for the low power structure comprises the steps that firstly, the ethyl alcohol, the hydrochloric acid, the nitric acid and the distilled water are evenly mixed, and the erosion agent is prepared; then, an eroded stainless steel sample is cut and polished, and an erosion surface is obtained; after erosion is finished, the steel sample is placed in an alkaline solution to be cleaned, and acid removing treatment is conducted; and finally, the steel sample is placed in the ethyl alcohol solution to be cleaned, the steel sample is blown dry after cleaning, the erosion face is scanned through a scanner, and a picture of a low-power condensation structure is prepared. An effective method is provided for preparing and observing of the medium-chromium-based ferritic stainless steel low power structure, the prepared structure picture is clear and visible, and the quality of the steel sample is effectively represented.

Description

technical field [0001] The invention relates to the technical field of corrosion observation of ferritic stainless steel structures, in particular to a method for preparing low-magnification structures of medium-chromium-based ferritic stainless steel. Background technique [0002] Ferritic stainless steel refers to stainless steel that is mainly composed of ferrite in use. In addition to its stainless and general corrosion resistance, it has excellent properties such as chloride stress corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance, and has the characteristics of low cold hardening tendency, high thermal conductivity and low linear expansion coefficient. Among them, medium-chromium-based ferritic stainless steel refers to low-carbon, nickel-free stainless steel, with a chromium content of 16%-18%, and a normal-temperature metallographic structure of ferrite. Medium chromium-based ferritic stainless steel has the following advantages: 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 施晓芳常立忠周俐
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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