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Thermal-etching and display method for treelike crystal of a low-carbon ER50-6 ingot blank
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A display method and hot corrosion technology, which is applied in the field of metallographic inspection, can solve the problems of environmental damage, cumbersome proportioning, large acid consumption, etc., and achieve the effects of clear display, simple operation, and low acid consumption
Active Publication Date: 2014-05-07
SHOUGANG CORPORATION
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Such as cold acid corrosion, hot acid corrosion, etc., which are commonly used in low-magnification, etc., the corrosion solution uses a 1:1 hydrochloric acid aqueous solution. The acid consumption is large, the surrounding environment is damaged and polluted, and dendrites cannot be clearly displayed
There are also a variety of corrosive solutions containing copper chloride, ferric chloride, and stannous chloride. This solution generally contains a variety of substances, which require accurate weighing and proportioning, and the proportioning is cumbersome.
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Embodiment 1
[0019] Take low-carbon continuous casting steel continuous casting billet ER50-6, the billet composition (mass percentage) is: C0.077, Si0.87, Mn1.46, P0.014, S0.014, Ti0.004. The dendrite corrosion and display steps of this continuous casting slab are:
[0020] 1) Cut the sample on the slab, the sample is rectangular, the length and width of the sample are 4.5cm and 3cm respectively, and the thickness is 2cm.
[0021] 2) Then the sample is ground and polished. When grinding, the sandpaper is sequentially selected as 150#, 600# and 800# sandpaper. When polishing, the polishing agent of 7μm and 3.5μm is used in sequence to polish until there is no scratch on the surface of the sample. Sample surface roughness ≤ 0.1μm, ready for use.
[0022] 3) Prepare the solution: mix 80ml of pure hydrochloric acid and 100ml of distilled water into a beaker, then add 3.6 grams of picric acid, and stir well.
[0023] 4) Heat the constant temperature bath to 70°C, put the beaker containing th...
Embodiment 2
[0028] The low-carbon continuous casting steel continuous casting slab ER50-6 is taken, and the composition (mass percentage) of the casting slab is: C0.075, Si0.87, Mn1.46, P0.014, S0.014. The dendrite corrosion and display steps of this continuous casting slab are:
[0029] 1) Cut the sample on the slab, the sample is rectangular, the length and width of the sample are 4cm and 3cm respectively, and the thickness is 2cm.
[0030] 2) Then the sample is ground and polished. When grinding, the sandpaper is selected as 150#, 600#, and 800# sandpaper in sequence. When polishing, the polishing agent of 7μm and 3.5μm is used in sequence to polish until there is no scratch on the surface of the sample , the sample surface roughness ≤ 0.1μm, ready for use.
[0031] 3) Prepare the solution: mix 70ml of pure hydrochloric acid and 100ml of distilled water into a beaker, then add 4.2 grams of picric acid, and stir well.
[0032] 4) Heat the constant temperature bath to 75°C, put the bea...
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Abstract
The invention relates to a thermal-etching and display method for a treelike crystal of a low-carbon ER50-6 ingot blank and belongs to the technical field of metallographic examination. The method comprises the following steps: truncating a sample, and grinding and polishing until no scratches exist on the surface of the sample; then preparing a corrosion solution by using hydrochloric acid, picric acid and water, putting the corrosion solution into a flask, heating the flask in a water bath of a constant temperature bath, and when the water solution in the flask is heated to 65-80 DEG C, putting the polished sample into the flask so that a polished surface comes into full contacted with the solution; corroding the sample at 65-80 DEG C for 10-30 minutes, taking out the sample, flushing the sample by water, drying the sample, and carrying out macroscopic shape sampling and treelike crystal interval measurement on the treelike crystal by virtue of a Leica SD6 stereoscope. The thermal-etching and display method has the advantages that the operation is simple, the acid consumption is low, a tedious reagent preparation step is omitted, the macroscopic shape of the treelike crystal of the low-carbon ER50-6 ingot blank can be rapidly and clearly displayed, and the method has a certain guiding significance to the research of a continuous casting process.
Description
technical field [0001] The invention belongs to the technical field of metallographic inspection, in particular to a method for hot corrosion and display of low-carbon ER50-6 billet dendrites. Background technique [0002] The dendrite spacing of the slab is affected by factors such as the chemical composition and the cooling rate of the continuous casting slab, and its size is closely related to the solidification structure and structure segregation. It can clearly display the dendrites, and then measure the dendrite spacing, which has important guiding significance for improving and optimizing the continuous casting process. At present, there are many methods for the corrosion and display of dendrites in China, but none of them are universal methods. A series of experiments are required for the dendrite display of each type of steel. Such as cold acid corrosion, hot acid corrosion, etc., which are commonly used in low-magnification, etc., the corrosion solution uses a 1:1...
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