SU827568A1 - Method of cooling cold-rolled roll steel after annealing - Google Patents

Description

one

The invention relates to ferrous metallurgy, in particular, to the production of cold-rolled steel, and improves the process of cooling coils of cold-rolled strip steel after they are annealed in bell-type furnaces.

A known method of cooling coils of cold-rolled steel after annealing, which consists in cooling the coil stack under a circulating muffle with protective gas until the temperature in the muffle space reaches 80-120 ° C, removing the muffle, disassembling the batch, placing the coils on the racks and their final cooling in air or under the fan up to 35-40 ° С 1.

The duration of cooling coils from 2 to 4 days. After that, the annealed rolls set in training, cut into sheets and shipped to the consumer.

A disadvantage of the known method of producing cold rolled steel is the low productivity of the process of cooling annealed coils on racks. This leads to an increase in production space before training.

The purpose of the invention is to reduce the duration of the cooling process while reducing the production area.

The goal is achieved by the fact that the final cooling is carried out by supplying a coolant, for example water, to the surface of the car during the training process.

The drawing shows a general view of the line of the training mill, which allows the proposed method to be carried out.

The line consists of an uncoiler 1, a lifting table (not shown in the drawing) located above my loop 2 with sprayers 3, the actual training mill and the winder.

The proposed method is carried out as follows.

After cooling to 80-120 ° C, the annealed rolls are passed directly to the training mill. The roll is mounted on unwinder I and the strip is fed to the pulling rollers 4. After the strip is caught by the pulling rollers 4, the lifting table is lowered and the loop loop 2 is filled with metal. At the same time through the sprayers 3 serves cooler, for example water, on the surface of the strip and cool it to the desired tempering temperature of 35-40 ° C.

Claims (1)

As a cooler, you can use water, compressed air or, for example, an air-emulsion mixture. Perhaps a combination of sequential supply of cooling water first, and then compressed air. After the loop after cooling, we go to the training mill 5 and then to the winder 6. The proposed method was tested in laboratory conditions. In the experimental furnace, 20 samples of 300x20 mm in size from steel 08 kp are modeled according to the mode: heating to 700 ° C in a neutral atmosphere at a speed of 30 deg / h, holding at this temperature for 5 minutes and cooling with a furnace to 100 ° C. Next, ten samples are cooled in air to 40 ° C, the remaining samples are cooled with water at different speeds from 50 to 10 ° C / sec. Cooled to 40 ° C, the samples are passed through a laboratory rolling mill with a reduction of 1.5-3%. The conducted mechanical tests show the identity of the properties of the samples cooled with air and cooled with water (see table). No discoloration or oxide film is observed on the surface of the samples. Thus, the application of the proposed method for cooling cold-rolled steel rolls reduces the duration of the cooling process and the production area. 68 The invention The method of cooling cold rolled steel after annealing, including cooling under the muffle to 80-120 ° C and final cooling, characterized in that, in order to shorten the process while reducing the production area, the final cooling is performed by rolling to the surface chiller, such as water, in the process of training. Sources of information taken during the examination 1. Sheftel I. I. Cold steel rolling, Metallurgizdat, 1953, p. 60-61.