Annealing process for producing cold rolling non-oriented electrical steel

Abstract

The invention discloses an annealing process for producing cold rolling non-oriented electrical steel. Band steel continuous annealing and galvanizing common production lines are adopted for the annealing working procedure, and the annealing working procedure comprises the following process conditions: A. preheating stage: preheating band steel to 190 DEG C + / -40 DEG C; B. heating at a direct-combustion stage: heating the band steel at naked flame to 700 DEG C+ / -60 DEG C; C. heating by a radiant tube: continuing heating the band steel by a radiant tube to 780 DEG C+ / -60 DEG C, and controlling the dew point to be less than or equal to minus 40 DEG C; D. soaking stage of the radiant tube: keeping the temperature of the band steel to be 870 DEG C+ / -60 DEG C by the electric radiant tube, and controlling the dew point to be less than or equal to minus 40 DEG C; E. spray cooling stage: introducing compressed air by a spray cooling fan at the spray cooling stage so as to enable the surface of the band steel to be oxidized evenly, and finally cooling the band steel to be 140 DEG C+ / -20 DEG C by the spray cooling fan; and F. discharging from a furnace: cooling the band steel to be 80 DEG C+ / -20 DEG C through a furnace nose, and discharging from the furnace. The process is used for producing the cold rolling non-oriented electrical steel bands by utilizing an existing band steel continuous annealing and galvanizing common production lines of iron and steel enterprises, and the costs of capital, equipment and production are reduced effectively.

Description

technical field [0001] The invention relates to a production process of non-oriented electrical steel, in particular to an annealing production process of cold-rolled non-oriented electrical steel. Background technique [0002] Electrical steel, also known as silicon steel sheet, is an indispensable and important soft magnetic alloy in the electric power, electronics and military industries, and is also the metal functional material with the largest output. It is mainly used as the iron core of various motors, generators and transformers. Non-oriented electrical steel is an electrical steel that forms a non-oriented deformation texture (crystalline structure) according to a certain production process. Cold-rolled non-oriented electrical steel is non-oriented electrical steel produced by cold rolling process, and its main use is for the manufacture of generators and motors. [0003] The annealing process of cold-rolled non-oriented electrical steel is usually produced by a s...

AI Technical Summary

Problems solved by technology

Sometimes the profit is quite high before the construction of the annealing line, but there is no profit at all after the completion, which greatly limits the promotion and sales of products; and the high construction cost of the production line will undoubtedly push up the production of cold-rolled non-oriented electrical steel cost

Therefore, the existing production method of cold-rolled non-oriented electrical steel has many disadvantages such as long equipment installation and debugging time, high equipment cost, and high product cost.