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Method for high-carbon steel casting blank dendritic crystal corrosion and measurement

A high-carbon steel and slab technology, which is applied in the field of high-carbon steel slab dendrite corrosion and measurement, can solve the problems of dendrite structure damage, deep corrosion, and slab structure error, etc., to achieve clear dendrite structure and suppress The effect of corrosion

Active Publication Date: 2018-10-23
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the existing slab dendrite corrosion method is mainly based on low-power acid etching method, the amount of chemical reagents is large, the corrosion degree is deep, and the dendrite structure is damaged to a certain extent, which will bring serious problems in the subsequent measurement of slab structure parameters. big error

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  • Method for high-carbon steel casting blank dendritic crystal corrosion and measurement
  • Method for high-carbon steel casting blank dendritic crystal corrosion and measurement

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Embodiment 1

[0019] The sample in the embodiment of the present invention, its chemical composition is C: 0.65%, Si: 0.8%, Mn: 0.5%, P: 0.015%, S: 0.020% high carbon steel continuous casting round billet sample, from the round billet Continuously cut samples with a length of 30 mm and a width of 20 mm from the surface layer to the radius of the core.

[0020] A method for dendrite corrosion and measurement of high carbon steel slab, comprising the following steps:

[0021] 1) Grind and polish the cross-section of the sample billet to a mirror surface according to the requirements of conventional metallographic inspection;

[0022] 2) Prepare a corrosive agent, dissolve picric acid and cuprous chloride in distilled water, then add detergent, stir and mix to obtain the product; the mass concentration of picric acid is 0.3%, and the mass concentration of cuprous chloride is 0.1%. The concentration of essence is 1%, and the balance is distilled water.

[0023] 3) Immerse the polished sample ...

Embodiment 2

[0026] The sample in the embodiment of the present invention, its chemical composition is C: 0.60%, Si: 0.75%, Mn: 0.55%, P: 0.013%, S: 0.015% high carbon steel continuous casting round billet sample, from the round billet Continuously cut samples with a length of 30 mm and a width of 20 mm from the surface layer to the radius of the core.

[0027] A method for dendrite corrosion and measurement of high carbon steel slab, comprising the following steps:

[0028] 1) Grind and polish the cross-section of the sample billet to a mirror surface according to the requirements of conventional metallographic inspection;

[0029] 2) Configure corrosive agent, dissolve picric acid and cuprous chloride in distilled water, then add detergent, stir and mix to get final product; the mass concentration of picric acid is 0.3%, the mass concentration of cuprous chloride is 0.15%, and the The concentration of essence is 1.5%, and the balance is distilled water.

[0030] 3) Immerse the polished...

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Abstract

The invention provides a method for high-carbon steel casting blank dendritic crystal corrosion and measurement. The method comprises the following steps of (1) flatly grinding a test specimen according to the conventional golden phase inspection requirement; performing polishing to be with a mirror surface; (2) preparing a corrosive: dissolving picric acid and cuprous chloride into distilled water; then, adding cleanser essence; performing stirring and mixing to obtain the corrosive; (3) polishing the test specimen; then, soaking the test specimen into the corrosive; next, taking out the testspecimen. Compared with the prior art, the corrosive used by the method has the advantages that during the preparation, the consumption of used chemical reagents is low; the corrosion degree depth isproper; no damage is caused on the dendritic crystal tissues; the clear casting blank dendritic crystal tissues photos can be obtained and are used for quantitatively evaluating the dendritic crystaltissues; the method belongs to an environment-friendly and accurate test method.

Description

technical field [0001] The invention belongs to the technical field of metal material detection, and in particular relates to a method for dendrite corrosion and measurement of high-carbon steel slabs. Background technique [0002] The solidification microstructure of cast slab is the basic factor to determine its internal quality. By observing the solidification structure of the continuous casting slab and studying its morphological characteristics, it is possible to measure data such as the deflection angle of the columnar crystals and the secondary crystal spacing of the dendrites, and then speculate on its solidification conditions, which can provide a lot of information for improving the solidification conditions and the quality of the continuous casting slab. Valuable technical information. For example, for the same type of steel, although the smelting method and specifications are different, as long as the secondary grain distance is measured, the cooling rate can be...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N1/28
CPCG01N1/28G01N17/00
Inventor 杨峥王德宝刘志军牟祖茂徐辉程志远
Owner MAANSHAN IRON & STEEL CO LTD
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