Cold-rolling production process of high-carbon steel

Abstract

The invention discloses a cold-rolling production process of high-carbon steel. The cold-rolling production process comprises the following steps of pickling, first annealing, first calendering, second annealing, second calendering, third annealing, finishing and warehousing of finished products. According to the cold-rolling production process, the first annealing temperature after pickling is reduced, so that production is carried out in a conventional annealing furnace, the production cost is lower, the service life of the production equipment is prolonged, and the produced products have excellent performance.

Description

technical field [0001] The invention relates to a production process of a steel strip, in particular to a cold rolling production process of high-carbon steel. Background technique [0002] The production of domestic high-carbon steel has been dominated by imported materials all year round, and many imported hot-rolled coils are used. The cold-rolled production process also adopts the traditional production process, which is pickling, spheroidizing annealing, rolling, spheroidizing annealing, rolling, Spheroidizing annealing, finishing, finished product warehousing, especially the first spheroidizing annealing, for high carbon steel, it usually needs to reach about 780°C, for ordinary bell annealing furnaces, the temperature is too high and it is not easy to produce , and it is also easy to cause uneven spheroidization due to uneven temperature, which affects later rolling and produces large thickness tolerance fluctuations. This traditional production process has higher req...

AI Technical Summary

Problems solved by technology

[0002] The production of domestic high-carbon steel has been dominated by imported materials all year round, and many imported hot-rolled coils are used. The cold-rolled production process also adopts the traditional production process, which is pickling, spheroidizing annealing, rolling, spheroidizing annealing, rolling, Spheroidizing annealing, finishing, finished product warehousing, especially the first spheroidizing annealing, for high carbon steel, it usually needs to reach about 780°C, for ordinary bell annealing furnaces, the temperature is too high and it is not easy to produce , and it is also easy to cause uneven spheroidization due to uneven temperature, which affects later rolling and produces large thickness tolerance fluctuations. This traditional production process has higher requirements for production equipment

[0003] Description of spheroidizing annealing: Conventional spheroidizing annealing needs to be heated to about 20 degrees Celsius higher than the austenite transformation temperature of 727 degrees Celsius, and kept for a period of time to complete. However, due to the high carbon content of high carbon steel, its austenite transformation temperature It is higher than conventional low-carbon steel. Considering the temperature difference of hood annealing, it is necessary to carry out spheroidizing annealing of high-carbon steel at 780 degrees Celsius, while the maximum temperature of conventional hood annealing is 750 degrees Celsius. The risk is relatively high. Big