Process and device for coating-free electrical steel annealing and bluing

A non-coating, electrical steel technology, applied in the field of heat treatment, can solve problems such as sticking, oxidation and punching deformation, affecting lamination, punching and scrapping, etc., to achieve the effect of reducing iron loss, improving efficiency, and eliminating sticking

Active Publication Date: 2007-12-05
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

[0005] Due to the fact that the original bell furnace or pit furnace semi-process electrical steel sheets often have sticking, oxidation and punching deformation after annealing, which directly affects the subsequent laminations, and many punching sheets are scrapped, and the semi-process cannot be realized. The process of annealing and bluing the finished silicon steel stator (rotor) laminations directly

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  • Process and device for coating-free electrical steel annealing and bluing
  • Process and device for coating-free electrical steel annealing and bluing
  • Process and device for coating-free electrical steel annealing and bluing

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Embodiment Construction

[0023] Referring to Fig. 1, the uncoated electrical steel annealing and bluing process of the present invention, the semi-process that is the uncoated silicon steel sheet is punched and the finished iron core after stacking the sheets is placed in the bell furnace (step 101), and carried out After the sealing inspection, set the heating cover, vacuumize the atmosphere in the inner cover, and fill it with nitrogen (step 102), then pump the nitrogen out again by the vacuum pump system, feed hydrogen and start heating (step 103); under the hydrogen atmosphere, half the process-- The uncoated silicon steel laminate product is annealed and kept at a high temperature of 700-820°C for 2-3 hours (step 104); when the finished iron core is slowly cooled to 300-450°C (step 105), the inner cover Carry out vacuuming (step 106), after vacuum <-95000Pa, pass into the furnace with an aqueous solution medium for bluing (water or water vapor, or a reagent for bluing), (step 107); simultaneously ...

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Abstract

The no-coating electric steel sheet annealing and blueing process includes the following steps: 1. annealing laminated no-coating silicon steel sheets inside a bell type furnace under hydrogen atmosphere; 2. vacuumizing the bell type furnace to vacuum degree lower than 95000 Pa after the silicon steel sheets are cooled slowly to 300-450 deg.c, and leading blueing water solution to the furnace before maintaining the temperature for 20-60 min; and 3. vacuumizing for the second time, filling nitrogen for cooling and discharging in the temperature lower than 150 deg.c. The process has high annealing quality, homogeneous blueing effect, and capacity of raising the magnetic induction coefficient of silicon steel sheets and lowering their iron loss.

Description

technical field [0001] The invention belongs to heat treatment technology, in particular to a process and device for annealing and bluing of uncoated electrical steel sheets. Background technique [0002] At present, there are two main types of annealing and flange treatment equipment for the production of motor iron cores from uncoated silicon steel. One is the early bell furnace or pit furnace + blueing furnace; the other is the continuous annealing furnace. [0003] The early well-type furnaces did not have the bluing function. The annealed motor iron chips were released from the furnace at about 300°C during the cooling process, and oxidized in the air to turn them blue. This process affects various performance indicators of the motor core. [0004] Some manufacturers have switched to bell furnaces to realize the annealing and bluing process. Nitrogen or nitrogen plus a small amount of hydrogen (pure nitrogen plus ammonia decomposition gas can be used) is used as the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/773C21D11/00C23C22/05
Inventor 李红梅向顺华关运泽刘华飞
Owner BAOSHAN IRON & STEEL CO LTD
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