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

Abstract

The invention discloses a flexible strip steel treating line suitable for producing various high-strength steel. The flexible strip steel treating line comprises an uncoiling working position, a washing working position, a heating working position, a soaking working position and a slow cooling working position, a jet cooling working position or a water quenching cooling working position in turn, wherein a reheating working position and then an overaging working position or a hot galvanizing working position and a cladding alloying and annealing working position are arranged after the jet cooling working position; a moveable bypass channel is arranged to connect the reheating working position and the overaging working position respectively; a final cooling working position and a flatting working position are connected after the overaging working position and the hot galvanizing working position; then, a finishing working position and an oil coating working position, or a passivating working position and other post-treatment working positions are connected; the finishing working position and the oil coating working position are connected to a coiling working position to finish a finished product; an acid cleaning working position and an electroplating working position are arranged corresponding to the water quenching and cooling working position; the reheating working position can be connected after the acid cleaning working position directly; an uncoiling and washing working position can be directly connected before the electroplating working position; and the bypass channel or a switching device is arranged after the electroplating working position to respectively and correspondingly connect the reheating working position or directly connect the passivating working position and the other post-treatment working positions.

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 cold-rolled sheets, hot-dip galvanized sheets and alloyed hot-dip galvanized sheets , even low-strength phase-change-strengthened cold-rolled sheets, hot-dip galvanized sheets, and alloyed hot-dip galvanized sheets with good 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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