Cold-etching agent displaying dendritic structure form of high-carbon steel continuous casting billet and preparation method

Abstract

The invention provides a cold-etching agent displaying dendritic structure form of high-carbon steel continuous casting billets and a preparation method. The cold-etching agent includes 10-15 g of ferric trichloride, 1-3 g of ammonium cupric chloride, 200-400 ml of anhydrous ethanol, 20-40 ml of hydrochloric acid, 1-3 parts of trinitrophenol and 1500-2000 ml of distilled water. The preparation method includes the steps of (1) mixing the ferric trichloride, the ammonium cupric chloride and the trinitrophenol; placing the mixture in a glass container; (2) uniformly dividing the distilled water into two parts, wherein one part is added to the solid agent and the anhydrous ethanol in a certain amount is added to the other part; (3) adding the hydrochloric acid to the anhydrous ethanol water solution; (4) pouring the water solution into the water solution containing the ferric trichloride, the ammonium cupric chloride and the trinitrophenol; and (5) mixing the solutions and allowing the mixed solution to stand for 8 h. The cold-etching agent is high in detection speed, is less in pollution, is energy-saving, is simple in operation, can clearly show the content of carbon and the low-multiply dendritic structure form of the steel continuous casting billets containing alloy elements, so that billet shell crystals, columnar crystals and central isometric crystals in continuous casting solidification and defects are easy to distinguish.

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...

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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