A start-up control method for continuous hot-dip galvanizing
A control method, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve problems such as zinc pot scratches, sinking roll marks, pits, etc., to reduce the amount of zinc dross , Reduce frictional resistance and reduce production cost
Active Publication Date: 2015-09-30
SHOUGANG CORPORATION
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a continuous hot-dip galvanizing start-up control method, which solves defects such as zinc pot scratches, pits, sinking roll marks, etc.
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[0020] see figure 1 , a continuous hot-dip galvanizing start-up control method provided by an embodiment of the present invention specifically includes the following steps:
[0021] Step 101: adjusting the composition of the zinc solution;
[0022] 48 hours before the start-up of the continuous hot-dip galvanizing line, start to adjust the composition of the zinc liquid. Calculated by mass percentage, the aluminum content in the zinc liquid accounts for 0.22-0.225% of the total amount of the zinc liquid. For aluminum ingots, adjusting the composition of the zinc solution 48 hours in advance can ensure that the composition of the zinc solution is uniform when starting the car, and the aluminum content of the zinc solution can be controlled within the control range to reduce the amount of suspended zinc dross in the zinc solution;
[0023] Step 102: Preheating the new sinking roll;
[0024] Preheating starts 8 hours before the installation of the new sinking roller. The prehea...
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The invention discloses a control method for startup of continuous hot dip galvanizing, and belongs to the technical field of cold-rolled strip production. The method comprises steps of adjusting components of liquid zinc making that the weight percent of aluminium in the liquid zinc accounts for 0.22-0.225% of the total weight of the liquid zinc; preheating a new sink roller; lifting out an old sink roller and then cleaning zinc dross in the surface of the liquid zinc immediately; installing the new sink roller; establishing tension and starting up; and gradually raising the creep speed of startup making that the creep speed of startup reaches 140-150 m / min in two hours after startup, and then stabilizing the creep speed. The control method is advantageous in that defects, which are generated after startup of continuous hot dip galvanizing, comprising zinc pot scratches, pits, sink roller marks, and the like are effectively reduced; and quality losses and production cost are reduced.
Description
technical field [0001] The invention belongs to the technical field of cold-rolled strip production, in particular to a continuous hot-dip galvanizing start-up control method. Background technique [0002] During the production process of the continuous hot-dip galvanizing line, especially at the start-up stage, defects such as scratches, pits, and sinking roll marks are prone to occur, mainly due to improper control of the start-up process, resulting in poor rotation of the rollers in the zinc pot , Roller surface deposits a lot of zinc slag and other reasons, such defects are not easy to eliminate after the production line is started, it is best to carry out process control at the start-up stage. [0003] In the existing start-up process, the adjustment of the composition of the zinc liquid is generally completed within 8 hours before the start-up, adding high-aluminum ingots, resulting in uneven composition of the zinc liquid and more zinc slag; the preheating temperature...
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IPC IPC(8): C23C2/06
Inventor 娄德诚孔凡庆贾松王树岗任君茹
Owner SHOUGANG CORPORATION