Glass-film-free oriented silicon steel manufacture method and annealing isolation agent
A technology of annealing release agent and oriented silicon steel, which is applied in the field of glass-free oriented silicon steel manufacturing and annealing release agent. secondary recrystallization, guaranteed decarburization efficiency, and improved nitriding efficiency
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Embodiment 1
[0050] Steelmaking in a 500kg vacuum furnace, the chemical composition (Wt%) of the slab is: 0.051%C, 3.25%Si, 0.006%S, 0.028%Als, 0.006%N, 0.011%Mn, and the rest is Fe and unavoidable impurities. After the billet is heated at 1150°C, it is hot-rolled into a 2.5mm thick hot-rolled plate. After the hot-rolled sheet is normalized and annealed at 1150°C for 1 minute, it is pickled and cold-rolled to a final sheet thickness of 0.225 mm. The oxidation energy of cold-rolled sheet p(H 2 O) / p(H 2 ) is 0.152 and the temperature is 835 ° C under the conditions of 120 seconds of decarburization annealing treatment; followed by continuous nitriding treatment in a wet ammonia nitrogen hydrogen protection atmosphere. The decarburization annealing plate is coated with annealing release agent, and after being coiled, it is annealed at 1200°C for 20 hours in a dry nitrogen-hydrogen protective atmosphere, and the atmosphere in the heating section is 75% N 2 +25%H 2 , the high insulation sec...
Embodiment 2
[0058] Steelmaking in a 500kg vacuum furnace, the chemical composition (Wt%) of the slab is: 0.051%C, 3.25%Si, 0.006%S, 0.028%Als, 0.006%N, 0.011%Mn, and the rest is Fe and unavoidable impurities. After the billet is heated at 1150°C, it is hot-rolled into a 2.5mm thick hot-rolled plate. After the hot-rolled sheet is normalized and annealed at 1150°C for 1 minute, it is pickled and cold-rolled to a final sheet thickness of 0.225 mm. The cold-rolled sheet is decarburized and annealed at 835°C for 120 seconds; then the nitrogen and hydrogen mixed with wet ammonia pass through the oxidation energy to be nitriding. The coating composition of the decarburized annealed plate is 80 parts Al 2 o 3 +20 parts of MgO+2 parts of BiOCl annealing separator, after coiling, perform high-temperature annealing at 1200°C in a dry nitrogen and hydrogen protective atmosphere and hold for 20 hours. The atmosphere in the heating section is nitrogen-hydrogen mixed gas, and the high holding section ...
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