Cold acid corrosion method used for displaying low-multiple branch crystals in billet

A technology of dendrites and steel billets, which is applied in the field of displaying low-magnification dendrites inside steel billets, can solve the problems of acid liquid pollution, equipment investment and acid liquid cost, etc., to avoid environmental pollution, save acid liquid cost, and simple operation Effect

Active Publication Date: 2010-05-12
田陆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cold acid etching method in the prior art generally uses special equipment for etching tanks and hoisting devices, and puts the sample into the etchi

Method used

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  • Cold acid corrosion method used for displaying low-multiple branch crystals in billet
  • Cold acid corrosion method used for displaying low-multiple branch crystals in billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The billet sample is conventional carbon steel, containing 0.022% sulfur and 0.13% carbon.

[0037] After processing the surface of the billet sample to a surface roughness of no more than 1.25 μm, low-magnification dendrite corrosion was performed on the basis of low-magnification segregation corrosion by cold acid etching, and then the dendrites and defects appearing on the surface of the billet sample were observed.

[0038] The low magnification segregation corrosion solution includes a first corrosion solution and a second corrosion solution, the first corrosion solution is an ammonium persulfate solution with a mass percent concentration of 10% to 20%, and the second corrosion solution is a nitric acid solution with a mass percent concentration of Between 15 and 30%.

[0039] The low-magnification dendrite corrosion solution is an acidic solution of cupric chloride ammonia, its mass percentage concentration is between 8-15%, and the pH value of the solution is bet...

Embodiment 2

[0046] The billet sample is a low-sulfur continuous casting billet, containing 0.013% sulfur and 0.14% carbon.

[0047] The cold acid etching solution used and the experimental operation steps adopted are the same as those in the previous example.

[0048] figure 2 For the photos taken with a 10 million pixel digital camera for the steel billet sample after the operation of Example 2, the equiaxed crystals, dendrites and defects in the steel billet sample can be clearly seen, which cannot be realized in the prior art .

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Abstract

The invention relates to a cold acid corrosion method used for displaying low-multiple branch crystals in billet, which comprises the steps of leading the surface roughness of a billet sample to be less than or equal to 1.25 mu m by processing, conducting low-multiple branch crystal corrosion on the basis of low-multiple segregation corrosion by using the cold acid corrosion method, and then observing the displayed branch crystals and defects on the surface of the billet sample. The experimental method has the advantages of safeness, reliability, simple operation, low cost and the like.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a method for displaying low-magnification dendrites inside a billet during steelmaking production. Background technique [0002] In the production of steel products in the prior art, when inspecting the internal crystallization of the steel billet, the steel billet is usually subjected to low-magnification segregation corrosion to observe the degree of center segregation and center porosity. This method can only observe the center segregation and center porosity of the billet, but it is very difficult to observe defects such as cracks and inclusions in the billet, and more importantly, it is impossible to see the distribution of the low-magnification crystal structure of the billet. In the sample inspection of the steel plant, it is also necessary to observe the distribution of the low-magnification crystal structure of the steel billet, the distribution of cracks, inclusions and other...

Claims

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Application Information

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IPC IPC(8): G01N1/32
Inventor 田陆黄郁君杨建桃丁秀青
Owner 田陆
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