Macroscopic defect cold etching visualizing reagent

Abstract

The invention relates to a macroscopic defect cold etching visualizing reagent for the billet macroscopic structure defect quick detection in the steel production enterprise, which solves the problem at present that the reagent for detecting the macroscopic structure and internal defect of the billet is not easy to be stored and unable to be produced into the products with high danger and easy explosion; the harmful gas discharged in the process of etching with a heat acid method influences the human body and pollutes the environment; and a great deal of auxiliary machinery is invested. The invention is characterized by adding 5-30 ml of analytically pure nitric acid with the concentration of 65.0-68.0% into 100 ml water; or adding 3-15 g of anhydrous sodium sulfite or sodium sulphite in the above reagent. One of the using method of the invention is that: processing the sample billet to be detected to that of which the surface finish is smaller than 15 mum; pouring the mixed liquid prepared according to the above proportion on the sample surface for etching, waiting for about 30s, then washing with water, drying, repeating the operation until the casting billet structure presents clearly if there is an uncorruptible steel.

Description

Technical field: [0001] The invention relates to a reagent for rapid inspection of low-magnification structural defects of steel billets by iron and steel production enterprises. technical background: [0002] With the development of the modern iron and steel industry, it is becoming more and more important to quickly detect the internal quality of continuous casting slabs. Through the low-magnification inspection of steel, it is determined whether there are various structural defects such as cracks, segregation, porosity, and inclusions inside the steel. According to the inspection results, the continuous casting process parameters can be adjusted and optimized in time to improve the quality of the finished steel. At present, most steel mills use hot acid etching to detect the low-magnification structure of steel. This method has cumbersome procedures, high operating costs, and needs to first heat the 1:1 hydrochloric acid aqueous solution to 70-80°C (the heating process ta...

AI Technical Summary

Problems solved by technology

But the described 1~30 gram of persulfate+100 milliliters of water of the method of this invention, so just be mixed with peroxide aqueous solution, well-known peroxide is a typical heat unstable substance, is extremely sensitive to temperature and contact material, easily Low-temperature decomposition and heat generation, resulting in spontaneous combustion fire, so it has dangerous characteristics; strong oxidizing and corrosive, it will explode and burn violently when exposed to high heat or impact, and can form explosive mixtures when it comes into contact with combustibles, organic substances or easily oxidized substances, as well as sulfur and phosphorus , easy to catch fire or explode, and dust can irritate the eyes, skin and respiratory system; and because of its instability, the expiration date is very fast, so it can only be prepared and used now, and it is not easy to store

Therefore, the patent cannot be promoted as a finished product

Also use 100 milliliters of water or 100 milliliters of ethanol + 5-80 grams of ferric chloride + 0.1 milliliters of strong acid. After testing, it can only be effective in a small number of steel types according to its proportion, and the effect is not good.

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