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Corrosive agent for displaying subsurface crack defects of continuous casting billet and preparation method thereof

A technology of corrosive agent and steel billet, which is applied in the preparation of test samples, optical testing of flaws/defects, etc., can solve problems such as incompleteness, and achieve the effects of simple operation, energy saving, and fast inspection speed

Active Publication Date: 2020-10-30
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the general acid etching and other methods cannot completely and clearly display the family-like crack defects in the subcutaneous distribution of the continuous casting billet

Method used

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  • Corrosive agent for displaying subsurface crack defects of continuous casting billet and preparation method thereof
  • Corrosive agent for displaying subsurface crack defects of continuous casting billet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] It is used to show the low carbon steel continuous casting slab containing C 0.12wt%; Si 0.11wt%; Mn 0.34wt%; P 0.011wt%; S0.0051wt%; Cr 0.003wt%; Subcutaneous crack defect morphology.

[0033] 1) Preparation of corrosive liquid:

[0034]Get 6 grams of stannous chloride solid medicament and place in a glass container, add 1600 milliliters of distilled water, the stannous chloride solid medicament is dissolved. Take 105 milliliters of absolute ethanol and add it to the stannous chloride aqueous solution, stir evenly, add 10 milliliters of nitric acid to the above solution, stir evenly, then add 53 milliliters of hydrochloric acid, and shake evenly. Stand for 2 hours as mother liquor.

[0035] Get an equal amount of copper chloride and magnesium chloride solid medicament 0.2 grams and add it to the mother liquor, observe the color change of the medicament while stirring, then take the same amount of the two, take 0.1 gram as the unit, continuously increase the amount ad...

Embodiment 2

[0042] It is used to show the defect morphology of subcutaneous bubbles in continuous casting slabs containing 0.14wt% C; 0.26wt% Si; 0.21wt% Mn; 0.104wt% P; 0.003wt% S; the balance is Fe.

[0043] 1) Preparation of corrosion liquid:

[0044] Get 7 grams of stannous chloride solid medicament and place in a glass container, add 1800 milliliters of distilled water, the stannous chloride solid medicament is dissolved. Take 115 milliliters of absolute ethanol and add it to the tin protochloride aqueous solution, stir evenly, add 11 milliliters of nitric acid into the above solution, stir evenly, then add 56 milliliters of hydrochloric acid, and shake evenly. Stand for 2 hours as mother liquor.

[0045] Get equal amount of cupric chloride, magnesium chloride 0.4 gram and add in the mother liquor respectively, observe the change of medicament color while stirring, then get both equivalent values, take 0.1 gram as unit, constantly increase the amount of cupric chloride, magnesium ch...

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Abstract

The invention discloses a corrosive agent for displaying subsurface crack defects of a continuous casting billet and a preparation method thereof. Wherein one part of the corrosive agent is prepared from the following raw materials: 5 to 8g of stannous chloride, 100 to 120ml of absolute ethyl alcohol, 8 to 12ml of nitric acid, 50 to 60ml of hydrochloric acid, 1500 to 2000ml of distilled water, 0.2to 0.8 g of copper chloride and 0.2 to 0.8 g of magnesium chloride. The corrosive agent disclosed by the invention can clearly display the form, distribution and size of subcutaneous cracks of macrostructures of continuous casting billets according to the original appearance. Due to the fact that the corrosive agent is a weak cold acid etching reagent, selective corrosion to a steel base body isnot strong, the displayed structure of the steel base body is a dendritic crystal fine structure, subcutaneous crack morphology is not disturbed or damaged, and the edge of the subcutaneous crack which is a small-size macroscopic defect is clear.

Description

technical field [0001] The invention relates to the field of metallurgical analysis material inspection, in particular to a corrosive agent for displaying subcutaneous crack defects of continuous casting billets and a preparation method thereof. Background technique [0002] The subcutaneous crack of the billet is a relatively common continuous casting billet defect, generally 3-10mm away from the continuous casting billet surface. Distributed under the skin of the slab, it is a small crack with a length of 20-30mm, usually perpendicular to the surface of the continuous casting slab. When the subcutaneous cracks are far away from the surface of the slab, they can be rolled together in the subsequent hot rolling process. However, when the subcutaneous cracks are very close to the surface of the continuous casting slab, they may be exposed to the steel surface during thermal processing, and often appear on the surface of the rolled finished product in the form of folds, heavy...

Claims

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Application Information

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IPC IPC(8): G01N21/95G01N1/28G01N1/32
CPCG01N21/95G01N1/28G01N1/32Y02P10/20
Inventor 金星胡筱旋隋晓红
Owner ANGANG STEEL CO LTD
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