Acid pickling process method for high-temperature coiled material and application

Abstract

The invention discloses an acid pickling process for a high-temperature coiled material. The contents of the acid pickling process for the high-temperature coiled material comprises the following steps that 1) withdrawal and straightening scale breaking is conducted on strip steel in a withdrawal and straightening machine, and the withdrawal and tension is controlled to be that the tensile stressin the strip steel is controlled to be exceeded 0-20% of the yield limit of a material; the insertion depth of the withdrawal and straightening machine is 0.4 D + (3-10) mm, and D is the diameter of ascale breaking roller; and 2) the strip steel subjected to the scale breaking enters acid tanks to be subjected to acid pickling, and the strip steel sequentially enters three acid tanks, the mass concentrations of hydrochloric acid in the acid tanks are 4 +/-1%, 10 +/-2% and 12 +/-2% correspondingly, and the corresponding acid tank temperatures are set to be 85 +/-2 DEG C, 80 +/-3 DEG C and 75 +/-3 DEG C correspondingly, and the circulation amount of pickling solution in the acid tanks is not less than 230 m<3>/hour. According to the acid pickling process for the high-temperature coiled material, by controlling the withdrawal and straightening scale breaking parameters and the pickling process parameters, the pickling speed of the high-temperature coiled material can be greatly increased, the phenomenon of insufficient pickling of the strip steel is prevented, and meanwhile, the consumption of the hydrochloric acid in the pickling process can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of pickling, in particular to a pickling method for high-temperature coiled material. Background technique [0002] Continuous acid rolling is the mainstream technology for the production of cold-rolled products. After the hot-rolled steel strip is produced and transported to the continuous acid rolling unit, it first undergoes a pickling process. Dissolve the oxide skin on the surface of the hot-rolled steel strip in a flowing state to expose the pure iron matrix of the steel strip. Pickling is the main process to ensure the surface quality of cold-rolled products. The scale on the surface of hot-rolled strip must be removed by pickling, otherwise the residual scale will directly determine the surface quality of cold-rolled strip. [0003] At present, the pickling of carbon steel is usually dominated by hydrochloric acid pickling. The factors that determine the pickling speed and the quality of the strip a...

AI Technical Summary

Problems solved by technology

Although the implementation of this method does not require the modification of the existing pickling equipment, it is time-consuming and requires a huge amount of work because it needs to measure the surface activation energy and thickness of different coils in the laboratory. Therefore, it does not have the characteristics of large-scale application

[0009] The above-mentioned invention basically improves the pickling efficiency by transforming the original equipment or rationally setting the pickling parameter combination according to the structure of the scale, which has the difficulties of high cost, complicated process and difficult realization.

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