key points of the current production process of hot-plated aluminum, zinc, silicon steel strip,
With hot zinc plating aluminum silicon steel production belt with the basic requirements are:
( 1) the coating adhesion, conform to the requirements of the technical standards:
(2 )coating weight as low as possible, in order to effectively reduce the cost of production:
(3 )to eliminate or basically eliminated coating, thick edge and make it to the width of PCB production as can realize neat edge coiling, meet customer demand; In order to guarantee the surface quality of color plates, the surface of the plating layer shall be free from "gold, which belongs to flow pattern". ,The current production process of hot-plated aluminum zinc silicon steel strip is as follows.
1. Handle before annealing. Hot - plated aluminum, zinc, silicon and zinc are very strict on the cleanliness of the plate surface before the plate is put into the pan. The maximum value of the designed electrolytic current is 12000 A, and the actual value of the electrolytic current should be close to, and the maximum value can be 10,000 ~ 11,000 A. In the process of alkaline cleaning and hot water cleaning, the brush roller should keep working normally.
2. After degreasing and washing by electrolysis: the extrusion roller should operate normally and the extrusion pressure should be increased appropriately; The compressed air swept by the blow shall be fully opened: the hot air baked shall be fully opened. Thus, the surface of the steel belt is completely dry before entering the furnace, and no water is brought into the annealing furnace.
3. Annealing temperature refers to the temperature at the end of the heating section of the steel belt and the furnace temperature at the heating equalization section: refer to the data of annealing of the steel belt with the same thickness and width of the hot-dip galvanizing unit.
(4, )steel strip after cooling period at the end of the temperature: 610 ℃.Section
(5,) balance of furnace temperature: 610 ℃.Room temperature:
( 6,) hot roll according to 610 ℃.
(7,) steel strip after hot roller room temperature: 610 ℃.
(8,) trunk tank temperature: 610 ℃.The temperature at which steel is brought into the pan should be as close as possible to the temperature of the bath as possible. For hot dip plating, the most suitable temperature for steel is the same as the bath temperature. This is because, in order to prevent welding groove of plating solution set, the sensor can't electricity, in the steady production, ideally sensor with low power, the plating rate of the heat generated by the operation just compensation pot heat into the surrounding environment, the strip temperature is the same as the temperature of the plating solution, steel belt, both not nor to plating solution from the solution absorption of heat, in this way, both coating and the steel base to ensure that form a good metallurgical bonding, and energy saving.If the temperature of the steel band is lower than that of the bath, the sensor will consume more electricity if the bath is used to raise the temperature of the strip. If the steel, with a temperature higher than the bath temperature, a continuous flow of heat into the pot, it may cause the pot to overheat..