Everyone knows that the main packaging material of cans is tinplate in iron cans, and tinplate is a higher product in the cold-rolled steel industry. Because:
1) The original plate of tinplate in iron cans is a very pure low-carbon (C<0.12%) mild steel, and the residual non-metals between them during smelting mainly refer to P, S, Si, content and other metal content, such as Cu, Cr, Mn, etc. must be strictly controlled. Sometimes it is necessary to remove impurities from molten steel in a vacuum, which is technically demanding;
2) When hot rolling, the gradient of heating and cooling must be strictly controlled, otherwise segregation is easy to occur;
3) Cold rolling is to thin a 2mm thick hot-rolled plate (generally more than 1 meter in width) into a steel substrate of about 0.20 at a speed of 30 meters per second. In the 24-hour cold rolling operation, the average thickness of the product is wrong, and it must not be greater than 5 microns. Therefore, it can be said that the rolling mill has a pressure similar to that of a 10,000-ton hydraulic press, and the accuracy of a wall clock;
4) The annealing temperature and speed control are not accurate, and the hardness of tinplate does not meet the requirements;
5) Then, in any process such as cleaning, electroplating, soft melting, passivation, oiling, etc., the processing time is slightly extended or shortened, and the quality of tinplate will be greatly reduced.
In short, this kind of high-speed, high-precision and extremely powerful equipment, its products not only have good connotation quality, but also the appearance finish must reach the mirror level, which is destined to be a very strict high-precision high-tech product.
