Corrosive for displaying billet rimholes and preparation method thereof

A corrosive agent and air bubble technology, which is applied in the preparation of test samples, etc., can solve the problems that the diagnosis of subcutaneous air bubble defects has no direct reference significance, cannot explain the gas distribution state, and cannot give feedback in time, so as to avoid missed detection and improve inspection speed Fast, the effect of improving the detection rate

Inactive Publication Date: 2013-12-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical gas analysis method can only give the total content of the gas, but cannot explain the distribution state of the gas in the billet, and has no direct reference significance for the diagnosis of subcutaneous air bubble defects
Due to the lack of effective corrosion methods, the bubble defects in the billet cannot be reflected correctly, effectively and truly. When the billet bubbles are serious, it cannot be fed back in time, so that a large number of bubble defects are brought into the rolling process, resulting in an increase in the scrap rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] It is used to show that it contains 0.095 wt% of C, 0.01 wt% of Si, 0.34 wt% of Mn, 0.011 wt% of P, 0.0052 wt% of S, 0.03 wt% of Cr, 0.005 wt% of Ni, 0.005 wt% of Ti, and the balance is Fe. Morphology of subcutaneous bubble defects in alloy steel slabs.

[0019] Get 12 grams of ferric chloride solid medicine and be placed in a glass container, add 2000 milliliters of distilled waters and dissolve ferric chloride solid medicine. Take 50 milliliters of absolute ethanol and add it to the ferric chloride aqueous solution, stir well, add 5 milliliters of nitric acid, stir well, then add 15 milliliters of hydrochloric acid, and stir well again. Finally, add 0.8 gram of copper chloride reagent, fully stir and dissolve, and complete the preparation of the corrosive agent.

[0020] Before the test, the surface of the billet cross-section sample is processed into a test surface with a roughness of Ra≤0.025 μm.

[0021] Then wipe the surface of the sample evenly with cotton wool...

Embodiment 2

[0023] It is used to show the morphology of subcutaneous bubble defects in continuous casting slabs containing 0.09 wt% C, 0.26 wt% Si, 0.21 wt% Mn, 0.104 wt% P, 0.003 wt% S, and the balance is Fe.

[0024] Get 10 grams of ferric chloride solid agent and place it in a glass container, add 2000 milliliters of distilled water to dissolve the solid

[0025] The medicine dissolves. Take 60 milliliters of absolute ethanol and add it to the ferric chloride aqueous solution, stir well, add 5 milliliters of nitric acid, stir well, then add 20 milliliters of hydrochloric acid, and stir well again. Finally, add 0.9 g of copper chloride reagent and stir thoroughly to complete the preparation of the corrosive agent.

[0026] Before the test, the surface of the billet cross-section sample is processed into a test surface with a roughness of Ra≤0.025 μm. Then wipe the surface of the sample evenly with cotton wool dipped in the corrosion solution, and corrode for 5 minutes. When the dendri...

Embodiment 3

[0029] Used to show subcutaneous bubble defects in continuously cast slabs containing 0.12 wt% C, 0.16 wt% Si, 1.5 wt% Mn, 0.012 wt% P, 0.001 wt% S, 0.0019 wt% Ca, 0.0029 wt% N, and the balance is Fe form.

[0030] Get 25 grams of ferric chloride solid medicament and place in a glass container, add 2000 milliliters of distilled water to dissolve the solid medicament. Take 100 milliliters of absolute ethanol and add it to the ferric chloride aqueous solution, stir well, add 6 milliliters of nitric acid, stir well, then add 30 milliliters of hydrochloric acid, and stir well again. Finally, add 1.0 g of copper chloride reagent and stir thoroughly to complete the preparation of the corrosive agent.

[0031] Before the test, the surface of the steel billet cross-section sample was first processed into a test surface with a roughness of Ra≤0.025 μm; then the surface of the sample was evenly wiped with a cotton swab dipped in a corrosion solution, and corroded for 3 minutes. When t...

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Abstract

The invention provides a corrosive for displaying billet rimholes and a preparation method thereof. The corrosive is composed of the following components: 10-25 g of ferric chloride, 50-100 ml of absolute ethyl alcohol, 4-6 ml of nitric acid, 15-30 ml of hydrochloric acid and 0.8-1.0 g of copper chloride. The reparation method comprises the following steps: placing a ferric chloride solid in a glass container, and adding 2000 ml of distilled water to dissolve the ferric chloride solid; adding absolute ethyl alcohol into the ferric chloride aqueous solution, uniformly stirring and sequentially adding nitric acid and hydrochloric acid; finally, adding a specified amount of copper chloride, and fully stirring to prepare a finished product corrosive. The corrosive provided by the invention is high in inspection speed, small in pollution, energy-saving, simple and convenient to operate, weak in selective corrosion on a steel matrix and capable of clearly displaying the distribution, sizes and forms of the rimholes in a macrostructure of the billet in original appearance, thereby improving the inspection rate of the rimhole defect, avoiding the inspection omission phenomenon and reducing the quality loss in subsequent procedures.

Description

technical field [0001] The invention belongs to the field of inspection and testing reagents, and in particular relates to a corrosive agent for displaying the form of subcutaneous bubble defects in the low-magnification structure of a cast billet and a preparation method thereof. Background technique [0002] Subcutaneous air bubbles of steel billets are relatively common defects. When the size of subcutaneous air bubble defects is large enough, they will not be welded in the subsequent rolling process, and often appear on the surface of the finished product after rolling with heavy skin, warped skin or inclusions. Clusters appear, seriously affecting product quality and performance. For hot-rolled coils, if the air bubbles are exposed and oxidized during the heating and rolling process, curling, flying warping or fine line defects on the surface may be formed; Deterioration of the mechanical properties of steel. [0003] The key to eliminating the surface defects of the ...

Claims

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Application Information

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