Flexible strip processing line suitable for producing various high-strength steel

Abstract

The invention discloses a flexible strip processing line suitable for producing various high-strength steel, which has the following configuration: decoiling, cleaning, heating, soaking and slow cooling stations are arranged sequentially to a gas jet cooling station and a water quenching cooling station; a reheating station is arranged on the rear of the gas jet cooling station; an overaging station or hot galvanizing station and coating normalizing and annealing station are arranged on the rear of the reheating station, and a movable bypass channel is connected with the reheating and overaging stations; then, final cooling and leveling stations are arranged, and oiling or passivating and other postreatment stations are connected to a coiling station so as to obtain finished products; an acid pickling and electroplating stations are arranged corresponding to the water quenching cooling station; and a connecting channel is arranged on the rear of the electroplating station, and is correspondingly connected with the reheating or directly connected with the passivating station and other posttreatment stations. The flexible strip processing line integrates production of common cold-rolled sheets, and hot dip galvanized and coating alloying annealed sheets and electroplating of Zn and Ni sheets, particularly superstrength cold-rolled sheets, galvanized sheets and hot dip galvanizedand coating alloying annealed sheets to one machine set so as to realize flexible production.

Description

technical field [0001] The invention relates to strip steel heat treatment and surface treatment technology, in particular to a flexible strip steel treatment line suitable for producing various high-strength steels. Background technique [0002] Protecting the environment and realizing sustainable development have become the consensus of mankind in the 21st century. With the development of the modern automobile industry, weight reduction and energy saving have become the general trend. The results of automobile lightweight research show that in order to achieve the purpose of "weight reduction, energy saving, and emission reduction", the automobile industry must use a large amount of high-strength steel to reduce the thickness of the steel plate used. Therefore, the demand for high-strength cold-rolled sheets and hot-dip galvanized sheets has greatly increased. [0003] High-strength cold-rolled sheets are produced by a continuous annealing unit with a rapid cooling devic...

AI Technical Summary

Problems solved by technology

[0017] First of all, due to the lack of high hydrogen jet cooling with rapid cooling capacity and water quenching and pickling process, the dual-purpose manufacturing method of this patent not only cannot produce high-strength hot-dip galvanized and coating alloyed hot-dip galvanized sheets, even good Phase-change strengthened hot-dip galvanized and coating alloyed hot-dip galvanized sheets with lower strength levels of surface quality cannot be produced;

[0018] Secondly, because the pickling process after water quenching and the reheating and tempering process were not adopted, the high-strength cold-rolled sheet produced by the combined manufacturing method of this patent not only has poor surface quality, but also has poor plasticity and aging stability;

[0019] Finally, the patent’s dual-use manufacturing method of process implementation routes 2 and 3 is difficult to operate in actual production. When switching between galvanized sheets and cold-rolled sheets, the residual zinc on the roll surface will seriously affect the surface quality of cold-rolled sheets And the normal operation of the unit, and the sharing of the zinc pot and the water quenching tank will bring many difficult technical problems such as the bursting of the zinc pot and expensive switching costs

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