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Category Economy cars
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Created 2019-05-30
Owner juniperqq
Title Steel Coil Processing Method
Description According to the variety and specifications of raw materials and products, there are slight differences. Process pickling When aluminum zinc steel coil in stock is placed, it is easy to form an iron oxide with air if it is not treated, because the air is humid, and rust will occur over a long period of time. Therefore, the surface of the hot-rolled coil should be removed by a continuous pickling unit. The acid used to use sulfuric acid, and now more hydrochloric acid. Before pickling, it is welded and rolled first, and some are also continuously "black annealed". After pickling, it is washed, dried, trimmed, and divided. Cold rolling The pickled strip is rolled to a finished thickness on a cold rolling mill, generally without intermediate annealing. The total compression ratio of the cold rolling of the five-stand continuous rolling mill is generally 60-80%, and the main rolling thickness is 0.3 to 3 mm of automobile plates, enamel plates, and galvanized sheets. The six-stand continuous rolling mill mainly rolls tinned sheets with a thickness of 0.15 to 0.5 mm, and the total compression ratio of cold rolling is generally 70 to 90%. The amount of reduction of each frame (or pass) in the rolling is determined according to the pressure, power, and speed of the rolling mill, taking into account factors such as production and quality. Process lubrication Lubricates and cools. Generally, a good cooling performance emulsion is used, and a pure oil lubricant having good lubricating properties, such as a rolled tin plate or palm oil for stainless steel, is used for rolling a thin or hard metal. Annealing The purpose is to eliminate the cold rolling work hardening, to recrystallize the high quality GL galvanized Steel Coil, and to have good plasticity. The annealing method is performed by a hood furnace in a roll annealing and a continuous furnace annealing. Roll annealing is divided into tight roll annealing and loose roll annealing; continuous furnace annealing is divided into vertical continuous furnace annealing and horizontal continuous furnace annealing. Protective gas is generally introduced into the furnace. At present, most of the hood furnace annealing is used. Although the treatment cycle is long, the number of furnaces is large, the use is flexible, and the investment is saved. The continuous furnace annealing yield is large, and the horizontal continuous furnace annealing is only used to treat extraordinary steel with low output, such as decarburization annealing of silicon steel. Smooth The purpose is to avoid plastic instability of the steel coil after annealing and to improve the quality (flatness and surface condition) of the steel sheet. The temper mill has a single-stand reversible type and a double-stand type, and the flat compression ratio is 0.5 to 4%. The double-stand temper rolling mill has high efficiency and large compression ratio, and can also be used for secondary cold rolling at the same time to further thin steel sheets; if it is combined with a five-stand continuous rolling mill, it can produce coils of 0.10-0.15 mm.
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