阅读说明：本技术 钢坯热酸腐蚀工艺 (Hot acid corrosion process for billet ) 是由 陈杰 张建 蒲雪芬 鲍飞 赵明江 于 2021-07-28 设计创作，主要内容包括：本发明提供一种钢坯热酸腐蚀工艺,包括以下工艺步骤：预热,将新酸加热到工作温度T；腐蚀,将钢坯置入经加热过后的热酸中,并对钢坯腐蚀；清洗,对经热酸腐蚀后的钢坯进行清洗；预热,在钢坯腐蚀后的热酸温度降低时,再次预热达到工作温度T；沉淀,在不需对钢坯进行腐蚀时,将酸液进行沉淀过滤杂质；中和,将经腐蚀后不能再次使用的废酸与新碱中和；不仅具有过滤杂质的效果,还具有存放酸液作用,从而提高酸液的利用率,避免因杂质过多或温度降低而影响钢坯的腐蚀效果,从而提高了钢坯腐蚀的可靠性。(The invention provides a hot acid corrosion process for a steel billet, which comprises the following process steps: preheating, namely heating the neo-acid to a working temperature T; corroding, namely putting the steel billet into the heated hot acid, and corroding the steel billet; cleaning, namely cleaning the steel billet subjected to hot acid corrosion; preheating, namely preheating again to reach the working temperature T when the temperature of hot acid after the steel billet is corroded is reduced; precipitating, namely precipitating the acid liquor and filtering impurities when the billet does not need to be corroded; neutralizing, namely neutralizing waste acid which cannot be reused after corrosion with fresh alkali; the steel billet corrosion device has the effects of filtering impurities and storing acid liquor, so that the utilization rate of the acid liquor is improved, the corrosion effect of the steel billet due to excessive impurities or temperature reduction is avoided, and the corrosion reliability of the steel billet is improved.)

1. A hot acid corrosion process for a steel billet is characterized by comprising the following process steps:

preheating, namely heating the neo-acid to a working temperature T;

corroding, namely putting the steel billet into the heated hot acid, and corroding the steel billet;

cleaning, namely cleaning the steel billet subjected to hot acid corrosion;

preheating, namely preheating again to reach the working temperature T when the temperature of hot acid after the steel billet is corroded is reduced;

precipitating, namely precipitating the acid liquor and filtering impurities when the billet does not need to be corroded;

and (4) neutralizing waste acid which cannot be reused after corrosion with fresh alkali.

2. The hot acid etching process of steel billet according to claim 1, characterized by: the preheating adopts a graphite steam heating mode.

Technical Field

The invention belongs to the field of steel manufacturing, and particularly relates to a hot acid corrosion process for a billet.

Background

At present, in quality inspection in the steel industry, macrostructure inspection of a steel billet is generally performed in a hot acid, cold acid or electric corrosion mode, wherein the acid etching effect is optimal in the hot acid mode. In the process of acid etching by a hot acid mode, the acid liquor is preheated, corroded, cleaned and neutralized, but after the steel billet is corroded by the acid liquor, impurities are brought into the acid liquor to influence the subsequent corrosion of the steel billet.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a hot acid etching process for steel billets, which can reduce impurities in the acid solution.

In order to achieve the above and other related objects, the present invention provides a hot acid etching process for steel billets, comprising the following process steps:

preheating, namely heating the neo-acid to a working temperature T;

corroding, namely putting the steel billet into the heated hot acid, and corroding the steel billet;

cleaning, namely cleaning the steel billet subjected to hot acid corrosion;

preheating, namely preheating again to reach the working temperature T when the temperature of hot acid after the steel billet is corroded is reduced;

precipitating, namely precipitating the acid liquor and filtering impurities when the billet does not need to be corroded;

and (4) neutralizing waste acid which cannot be reused after corrosion with fresh alkali.

Optionally, the preheating is performed by heating with graphite steam.

As described above, the hot acid etching process for steel billets of the present invention has the following beneficial effects:

the steel billet corrosion device has the effects of filtering impurities and storing acid liquor, so that the utilization rate of the acid liquor is improved, the corrosion effect of the steel billet due to excessive impurities or temperature reduction is avoided, and the corrosion reliability of the steel billet is improved.

Drawings

FIG. 1 is a process flow diagram of an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

As shown in FIG. 1, the invention provides a hot acid etching process for a steel billet, which comprises the following process steps:

s01, introducing the neo-acid into a neo-acid tank, so that the neo-acid can be stored and used conveniently;

s02, preheating, namely, installing a preheating acid tank to preheat, enabling fresh acid in the fresh acid tank to flow into the preheating acid tank, and heating acid liquor flowing into the preheating acid tank in the fresh acid tank to a working temperature T required by acid liquor corrosion;

s03, corroding, installing a pickling working tank, introducing hot acid heated by the preheating acid tank into the pickling working tank, placing the steel billet into the hot acid in the pickling working tank, and corroding the steel billet;

s04, cleaning, installing a washing tower, cleaning and drying the steel billet corroded in the pickling working tank, and performing subsequent imaging evaluation;

s05, preheating, when the temperature of hot acid after the steel billet is corroded is reduced, enabling acid liquor in the pickling working tank to flow into the preheating acid tank for heating, and when the temperature of hot acid reaches the working temperature T, enabling the acid liquor to flow into the pickling tank again for corroding the steel billet;

s06 deposition, installing a deposition tank, when the billet is not needed to be corroded, the acid liquor which can be used in the preheating acid tank and the pickling working tank is led into the deposition tank, impurities in the acid liquor are deposited, the impurity filtering effect is achieved, the acid liquor storage effect is achieved, the utilization rate of the acid liquor is improved, the corrosion effect of the billet due to excessive impurities or temperature reduction is avoided, and the billet corrosion reliability is improved. When the acid liquor in the settling tank needs to be used, the acid liquor in the settling tank can be introduced into the preheating acid tank or the pickling corrosion tank.

Specifically, this gunbarrel includes gunbarrel body and apron, and this apron detachable installs on the gunbarrel body, adopts this structure setting, is not only convenient for wash and handle the dust, can also keep sealed, simultaneously, when the acidizing fluid of row, can not take place the excessive phenomenon.

And S07, neutralizing, namely, installing a neutralization tank and a fresh alkali tank, wherein the fresh alkali tank is filled with alkali liquor, the waste acid which cannot be used in the pickling tank is subjected to acid mist treatment and then is introduced into the neutralization tank, and the alkali liquor in the fresh alkali tank is introduced into the neutralization tank to neutralize the waste acid.

In some embodiments, the preheating adopts a graphite steam heating mode, and the graphite steam heating mode has the advantages of fast temperature rise, reduced preheating time, improved working efficiency, low energy consumption, long service life, low maintenance cost and the like.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.