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A kind of cold etchant showing the dendrite structure of high carbon steel continuous casting slab and its preparation method

A technology of dendrite structure and continuous casting slab, which is applied in the field of cold etchant and its preparation, can solve problems such as corrosion inspection, and achieve the effect of simple operation, low pollution and complete image

Active Publication Date: 2017-10-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the inspection of the low-magnification dendrite morphology of the original size sample of the high-carbon steel continuous casting slab, and provides a cold etchant that can selectively corrode the low-magnification dendrite structure of the high-carbon steel continuous casting slab, To solve the problem of low-magnification dendritic structure corrosion inspection of high carbon steel continuous casting slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] It is used to display the low-magnification dendrite structure morphology of high-carbon steel continuous casting slabs containing 0.71% to 0.82% of C, 0.5-0.8% of Mn and 0.15-0.35% of Si.

[0020] Put 10 grams of ferric chloride, 1 gram of trinitrophenol, and 1.5 grams of cupric ammonium chloride into a glass container; take 1600 ml of distilled water, divide it into two parts, and add one part to the glass container , another backup. Stir the solid medicine until it is completely dissolved. Take 200 ml of absolute ethanol and add to spare distilled water. Take 25 ml of 32.3% hydrochloric acid and add it to the aqueous ethanol solution. After stopping for 2-5 minutes, pour the ethanol+hydrochloric acid aqueous solution into the aqueous solution containing ferric chloride, cupric ammonium chloride and trinitrophenol to form a comprehensive medicinal solution. Leave it for 8 hours to complete the preparation of the reagent.

[0021] Wipe the surface of the sample wit...

Embodiment 2

[0023] It is used to display the low-magnification dendrite structure morphology of high-carbon steel continuous casting slabs containing C0.82%-0.85%, Cr0.20%, and trace alloy elements V, Ti, and Nb.

[0024] Put 13 grams of ferric chloride, 2 grams of picric acid, and 2 grams of cupric ammonium chloride into a glass container. Take 2000 milliliters of distilled water and divide it into two parts. One part is added to the glass container, and the other is added to the glass container. A spare. Stir the solid medicine until it is completely dissolved. Add 300 ml of absolute ethanol to the spare distilled water. Take 30 ml of 32.3% hydrochloric acid and add it to the ethanol aqueous solution. After stopping for 2-5 minutes, pour the ethanol+hydrochloric acid aqueous solution into the aqueous solution containing ferric chloride, cupric ammonium chloride and trinitrophenol to form a comprehensive medicinal solution. Let it stand for 8 hours to complete the preparation of the r...

Embodiment 3

[0027] It is used to display the low-magnification dendrite structure morphology of high-carbon steel continuous casting slabs containing 0.85% to 0.91% of C and containing trace amounts of V, Ti, Ni, and other alloying elements.

[0028] Put 15 grams of ferric chloride, 3 grams of picric acid, and 3 grams of cupric ammonium chloride into a glass container. Take 2000 ml of distilled water and divide it into two parts. One part is added to the glass container, and the other is added to the glass container. A spare. Stir the solid medicine until it is completely dissolved. Add 400 ml of absolute ethanol to the spare distilled water. Take 40 ml of 32.3% hydrochloric acid and add it to the ethanol aqueous solution. After stopping for 2-5 minutes, pour ethanol+hydrochloric acid aqueous solution into the aqueous solution containing ferric chloride, cupric ammonium chloride and trinitrophenol agents to form a comprehensive medicinal solution. Leave it for 8 hours to complete the p...

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Abstract

The invention provides a cold etchant for displaying the dendritic structure of high-carbon steel continuous casting slabs and a preparation method thereof, which consists of 10-15 g of ferric chloride, 1-3 g of cupric ammonium chloride, and 200-400 ml of absolute ethanol , hydrochloric acid 20-40ml, trinitrophenol 1-3g, distilled water 1500-2000ml. Mix ferric chloride, cupric ammonium chloride, and trinitrophenol into a glass container; divide the distilled water into two parts, and add one part to the solid medicine; add the specified amount of absolute ethanol to the other part Distilled water; add hydrochloric acid to the ethanol aqueous solution, then pour the ethanol and hydrochloric acid aqueous solution into the aqueous solution containing ferric chloride, cupric ammonium chloride and trinitrophenol, mix well and stand for 8 hours. The invention has the advantages of fast inspection speed, low pollution, energy saving, and easy identification of shell crystals, columnar crystals, central equiaxed crystals and defects solidified by continuous casting.

Description

technical field [0001] The invention belongs to the field of metallographic structure analysis, in particular to a cold etchant for displaying the low-magnification structure of high-carbon steel continuous casting slabs and a preparation method thereof. Background technique [0002] The low-magnification dendrite inspection method of steel is a new macro-weak cold acid corrosion inspection method for continuous casting slabs developed and applied in industrial practice in recent years to meet the requirements of continuous casting process optimization for slab inspection. According to the principle of selective corrosion, this method shows the dendrite structure of the cast slab. Compared with the traditional hot acid etch method, cold acid etch method, electrolytic corrosion method, and sulfur printing inspection method, the dendrite corrosion shows the solidified dendrite structure of the continuous casting slab. In addition, it also shows solidified low-magnification tis...

Claims

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Application Information

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