Pickling-rolling process of thin-gauge household appliance steel of 300 mu]m and below

Abstract

The invention provides a pickling-rolling process of thin-gauge household appliance steel of 300 mu]m and below and belongs to the technical field of a steel product thin-plate rolling processes. According to the technical scheme, the cut-off amounts of a pickled-rolled head and a pickled-rolled tail are controlled to be larger than 5 m, the meshing amount of a withdrawal and straightening machine is increased to be 40 mm, the shear amount of a circle shear does not exceed 60 kilometers, the speed of a fifth rolling mill outlet is controlled to range from 400 m / min to 800m / min, the concentration of an emulsified liquid tank 1 is 3.0%-3.5%, the concentration of an emulsified liquid tank 3 is controlled to be 0.5%-1.0%, and a working roller and a middle roller within a certain rolling amount range are adopted. By means of the pickling-rolling process, the belt breakage risk in the rolling process is reduced, the quality of the thin-gauge household appliance steel of 300 mu]m and below is also ensured, accordingly the pickling-rolling yield of the thin-gauge household appliance steel of 300 mu]m and below is remarkably improved, the problem that ultra-thin steel belts are very difficult to roll is solved, and the pickling-rolling process makes contribution to rolling of the ultra-thin steel belts and has remarkable economic benefit.

Description

technical field [0001] The invention relates to an acid rolling process of 300 μm or less thin gauge steel for household appliances, and belongs to the technical field of steel thin plate rolling process. Background technique [0002] In recent years, the demand for thin-gauge steel for household appliances in the household appliance industry has been increasing day by day, and the corresponding strip steel thinning technology has become a major trend in the development of steel rolling production technology in steel production enterprises. In the metallurgical industry, it is generally believed that 300μm is a critical point of the capacity of the acid rolling mill. Ultra-thin steel strips that break through this critical point are extremely difficult to roll. The main factors affecting the rolling of ultra-thin steel strips are as follows. [0003] First of all, when the acid rolling line produces 300μm thin gauge steel for home appliances, strip breakage is the most commo...

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Problems solved by technology

[0005] Thirdly, if the exit speed of the rolling mill is too low or too high, it will affect the quality of acid rolling

If the exit speed of the rolling mill is too low, the output will decrease, and the thickness fluctuation of the steel strip will increase; if the exit speed of the rolling mill is too high, the vibration of the rolling mill will obviously intensify, which will affect the stability of the rolling process and the accuracy of plate thickness control

[0006] Also, in the pickling production process, the working kilometers of the working rolls and intermediate rolls of the rolling mill also have a great influence on the thickness and shape quality of the pickling steel strip. The roll shape of the new rolling mill work rolls and intermediate rolls There is a sharp increase in wear and surface roughness in the early stage, and then enters a stable rolling period. When the kilometers of work rolls and intermediate rolls exceed a certain number of running kilometers, the roughness and roll shape deteriorate, and good plate quality cannot be guaranteed. shape quality

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