201 Stainless Steel Plate

201 stainless steel plate process flow is: raw material preparation, annealing pickling -+(intermediate grinding), rolling -+ intermediate annealing pickling -+ rolling -÷ Finished annealing pickling, flat -+(finished grinding and polishing), cutting and packaging into storage.

Thermal treatment is intended to adjust arrangements to eliminate work hardening and facilitate further processing. Ni-cr stainless steel is usually annealed by continuous furnace, Cr stainless steel annealed by cover furnace, continuous furnace operation control messy, high technical content. Ni-cr stainless steel is a solution disposal, the key is rapid cooling, the demand cooling rate of 55℃/s, rapid after carbide solid solution reseparation temperature zone (550℃ to 850℃). The holding time should be as short as possible, otherwise the grain thickness will affect the finish. Cr stainless steel heating temperature is low (900℃ or so), more use of slow cooling to obtain annealing softening arrangement. Continuous annealing furnaces are divided into direct heating and bright light annealing furnaces with protective gas according to different heating methods. Direct heating type can also be divided into horizontal furnace and vertical furnace, horizontal furnace is used more widely. Horizontal annealing furnace has a heating section and a cooling section. The heating section is expanded from cut-open to integration, saving 50% of energy consumption. The furnace is equipped with the furnace roller to support the strip steel. The furnace roller is of sub-parent structure, that is, a large roller with two small rollers of 1800, one working and one standby.

When the roller change repair can quickly and conveniently transfer the spare roller to the working position. The length of the furnace depends on the output value of the furnace. If you want to increase the heating, you can only add the length of the furnace. But the tension formed by the overhang of the strip steel in a high temperature state is bound to be constrained. In order to overcome this constraint, it is necessary to add the furnace roll in the furnace, which becomes a whole, and then improve the heating efficiency. Some factories abroad have adopted vertical furnaces. Practical operation indicates that the following questions exist in the vertical furnace:

(1) To make the strip run smoothly and avoid abrasion on the strip surface, the upper and lower steering roller should be lined with rubber;

(2) In the design of tension control, it is necessary to think about the allowable tension of strip steel at high temperature and the self-weight of the high temperature section and cooling section, so the height of the furnace is bound to be straight. Therefore, direct heating vertical furnace has not been widely used.