Annealing method of external layer-oxidized cold-rolled non-oriented electrical steel
A technology of oriented electrical steel and annealing, which is applied in the field of steel rolling production, can solve the problems of high cost, high energy consumption, and long process, and achieve the effects of saving coating liquid, reducing the thickness of the insulating layer, and good punching performance
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[0019] Describe below in conjunction with specific embodiment:
[0020] The present invention adopts a horizontal continuous annealing furnace. The annealing furnace has a total length of 295m, consisting of 2 sections of preheating furnace (PH), 5 sections of non-oxidizing heating furnace (NOF), 5 sections of radiant tube heating furnace (RTF), 14 sections of soaking furnace (SF), and circulating protective gas cooler (RJC) composition. The furnace shell is an airtight welded structure.
[0021] 1) The nitrogen circulation in the control circulation gas cooler, the oxygen content is 800±50ppm.
[0022] 2) Control the cooling fan output of the circulating cooler so that the plate temperature leaving the circulating cooler is 400±30°C.
[0023] 3) Control the dew point of the soaking furnace to 20±5°C.
[0024] 4) The dew point of the circulating cooler is controlled at 20±5°C.
[0025] Table 1 embodiment and routine process control
[0026]
[0027] Through the above ...
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