Method for producing oriented silicon steel with good bottom by low-temperature heating
A low-temperature technology for oriented silicon steel, applied in the field of low-temperature heating to produce oriented silicon steel, can solve the problems of large burning loss, low utilization rate, and inability to form a bottom layer
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[0055] Use a 500kg vacuum furnace to make steel, the chemical composition of the smelting:
[0056] C: ≤ 0.065%, Si: ≤ 3.5%, Als ≤ 0.035%, Mn: ≤ 0.20%, Cu ≤ 0.12%, Sn ≤ 0.15%, and control very little N and S process components to form silicon steel slabs.
[0057] ●Silicon steel slabs are heated below 1280°C;
[0058] ●Normalization condition 1150℃×5s+930℃×70s+50℃ / s cooling, strip cold rolling to 0.30mm, 850℃ nitriding, dew point in heating section: -15℃~-40℃;
[0059] ●Nitriding time: 5-50 seconds;
[0060] ●Nitriding medium: NH 3 , requires the use of dry NH 3 , the dew point is below -40°C;
[0061] ●Protective atmosphere: H 2 with N 2 Mixed gas, H 2 Content: 20~75%, atmosphere dew point (ie nitriding dew point) -15℃~-40℃, NH 3 The concentration accounts for the total amount of gas: 0.1-25%;
[0062] The nitriding target is about 170ppm, the dew point of decarburization annealing is 50℃~75℃, the special MgO for silicon steel is used, and its hydration rate (Hydrabi...
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