Cold-state stainless steel band or plate descaling process

Abstract

The invention discloses a cold-state stainless steel band or plate descaling process, which mainly and sequentially comprises the following six process steps of: preparing for feeding; performing stretch bending, scale breaking and straightening; performing high-pressure water descaling pretreatment; performing high-pressure water descaling; performing high-pressure water descaling post-treatment; and coiling. According to the cold-state stainless steel band or plate descaling process, after the former two treatment steps are performed, the steel band or plate is turned from a horizontal state into a vertical state, then subsequent two processes are performed, and the steel band or plate is turned into the horizontal state and the subsequent treatment processes are performed. The cold-state stainless steel band or plate descaling process is combined application of a stainless steel acid washing continuous descaling process and a high-pressure water descaling system in the prior art, and continuous descaling production of an abrasive high pressure water jet descaling technology on the cold-state stainless steel band or plate is realized. Compared with the conventional stainless steel acid washing descaling process, a shot blasting step and an acid washing step are reduced, the abrasive high pressure water jet descaling technology is adopted, the descaling speed and the efficiency are high, the effect is good, no damage is caused to the surface of the stainless steel band or plate, and the environment is not polluted.

Description

technical field [0001] The invention relates to a non-pickling removal process of metal surface oxide scale in the field of iron and steel metallurgy, in particular to a continuous descaling process for cold stainless steel strips or plates. Background technique [0002] Stainless steel has many superior properties, and has been widely used as a special steel in life and production. As the main product of stainless steel, stainless steel plate or strip plays an irreplaceable role in production and life. However, during the hot rolling and annealing process of stainless steel, a layer of black and hard oxide scale will be formed on the surface, and it will be quite tightly combined with the matrix. Its main component is Fe 2 o 3 and Cr 2 o 3 . The existence of this oxide scale will have a serious impact on the cold rolling process, so it must be removed before the stainless steel cold rolling process. Unlike ordinary carbon steel, stainless steel contains Cr which is in...

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Problems solved by technology

In the actual production process, the above process has the following disadvantages: stainless steel strip shot blasting will leave many small pits on the surface of the strip, and shot blasting will cause the surface of the strip to harden, affecting the surface quality of the strip. In addition, the dust pollution in the shot blasting process is serious; the scale of the stainless steel strip is due to the presence of Cr 2 o 3 As a result, in the actual production process, there are unremoved scales on the surface of the strip steel after pickling, forming pits, which affect the surface quality of stainless steel; due to the large amount of strong acid solution used in this process, the environmental pollution is serious

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