A cold etchant for displaying segregation of bearing steel billet ingot shape and its preparation method

A technology of ingot segregation and cold etchant, which is applied in the field of cold etchant showing ingot segregation defects in the low-magnification structure of bearing steel billets and its preparation, which can solve the problem of ingot segregation defects that cannot be completely and clearly displayed in bearing steel billets, etc. problem, to achieve the effect of fast inspection, less pollution and accurate positioning

Active Publication Date: 2018-02-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the segregation defects of the bearing billet ingot cannot be completely and clearly displayed by general acid etching and other methods, and provide a cold acid etching method for selective corrosion, which can display the segregation defects of the bearing billet ingot in its original appearance Morphology, thereby avoiding the cold corrosion agent and its preparation method of missed detection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Used to show bearings containing C 0.95 wt%, Si 0.15 wt%, Mn 0.35 wt%, P 0.011 wt%, S 0.052 wt%, Cr 1.4 wt%, Ni 0.3 wt%, Cu 0.25 wt%, the balance is Fe Segregation defect morphology of steel billet ingot shape.

[0018] Take 4 grams of trinitrophenol and 7 grams of ferric chloride solid medicine and place them in a glass container, add 200 milliliters of distilled water, and dissolve the solid medicine. After stirring evenly, add 15 ml of nitric acid, stir evenly, then add 15 ml of hydrochloric acid, after stirring evenly, add 100 ml of distilled water into it. Stir fully to complete the preparation of the cold etchant.

[0019] The surface of the billet cross-section sample is processed into a test surface with a roughness of Ra≤0.16 μm. Wipe the surface of the sample evenly with cotton wool dipped in cold etchant, and corrode for 5 minutes. When the 1 / 4 area from the surface of the test surface to the center of the test surface shows frame-shaped segregation traces,...

Embodiment 2

[0021] It is used to show that it contains C 1.03 wt%, Si 0.4 5 wt%, Mn 0.45 wt%, P 0.012 wt%, S 0.042 wt%, Cr 1.5 wt%, Ni 0.3 wt%, Cu 0.24 wt%, Mo 0.30 wt%, remaining The morphology of segregation defects in bearing steel billets with Fe content.

[0022] Take 5 grams of trinitrophenol and 10 grams of ferric chloride solid medicine and place them in a glass container, add 200 milliliters of distilled water, and dissolve the solid medicine. After stirring evenly, add 20 ml of nitric acid, stir evenly, then add 20 ml of hydrochloric acid, stir well, and then add 150 ml of distilled water. Stir fully to complete the preparation of the cold etchant.

[0023] The surface of the billet cross-section sample is processed into a test surface with a roughness of Ra≤0.16 μm. Wipe the surface of the sample evenly with cotton wool dipped in the corrosion solution, and corrode for 5 to 6 minutes. When there are frame-shaped segregation traces in the 1 / 4 area from the surface of the test ...

Embodiment 3

[0025] Used to show that it contains C 1.05 wt%, Si 0.75 wt%, Mn 0.45 wt%, P 0.012 wt%, S 0.042 wt%, Cr1.6 wt%, Ni 0.3 wt%, Cu0.25 wt%, Mo 0.40 wt% , the balance is Fe bearing steel slab ingot segregation defect morphology.

[0026] Put 6 grams of trinitrophenol and 8 grams of ferric chloride solid medicine into a glass container, add 200 milliliters of distilled water, and dissolve the solid medicine. After stirring evenly, add 25 ml of nitric acid, stir evenly, then add 25 ml of hydrochloric acid, stir well, and then add 120 ml of distilled water. Stir fully to complete the preparation of the cold etchant.

[0027] Process the surface of the billet cross-section sample into a test surface with a roughness of Ra≤0.16 μm; dip the cotton wool into the corrosion solution to wipe the surface of the sample evenly, and corrode for 5 to 6 minutes. When there are frame-shaped segregation traces in 1 / 4 area, extend the corrosion time and focus on corroding this area. After the frame...

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Abstract

A cold etchant for displaying the segregation of the ingot shape of a cast billet of bearing steel. ml, 300-400 ml of distilled water. Put the quantitative trinitrophenol and ferric chloride solid medicine in a glass container, add 200 milliliters of distilled water to dissolve the solid medicine; then add nitric acid and hydrochloric acid to the trinitrophenol and ferric chloride aqueous solution, After stirring evenly, add the remaining amount of distilled water into it, and stir thoroughly to complete the preparation of cold etching agent. The invention has the advantages of fast inspection speed, low pollution, energy saving and simple operation, and can clearly display the position, distribution and shape of the ingot shape segregation defects of the low-magnification structure of the bearing billet, and the contrast effect is obvious. The edges of the macro-defects that flow when the billet is rolled are clear and the positioning is accurate, which can effectively avoid missing inspections.

Description

technical field [0001] The invention belongs to the field of analysis and inspection of metallurgical materials, in particular to a cold etchant for displaying ingot shape segregation defects in low-magnification structures of bearing steel billets and a preparation method thereof. Background technique [0002] The ingot shape segregation defect in the low-magnification structure of the continuous casting billet is a common defect in the casting billet. When the segregation is serious, it can still exist in the center of the rolled product after being rolled into a round bar or wire, affecting the internal quality and performance of the product. For hot-rolled bars, the existence of ingot shape segregation leads to obvious differences in the structure of the edge and center of the cross-section, and some other defects gather in the segregation area, which affects the process control in the subsequent rolling process and forms waste products. For the production of wire rod pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 隋晓红张鹏远金星王军
Owner ANGANG STEEL CO LTD
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