Special double-layer carbon-free tundish covering agent for silicon steel and use method thereof
The technology of covering agent and tundish is applied in the field of metal smelting auxiliary materials, which can solve the problems such as carbon increase in continuous casting of silicon steel, and achieve the effects of strong assimilation and adsorption of inclusions, small loss on ignition and simple process.
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Embodiment 1
[0016] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 40%, MgO14%, CaO0.8%, Fe 2 o 3 18%, Al 2 o 3 13%, S0.001%, P0.0005%, the rest is lost on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 53%, MgO2%, CaO42%, Fe 2 o 3 0.8%, Al 2 o 3 2%, S0.001%, P0.0008%, and the balance is loss on ignition.
[0017] The method of use is as follows:
[0018] a. Add lower layer covering agent: after pouring, when the molten steel level of the tundish rises to a quarter of the tundish capacity, add about 30-50 kg of lower layer covering agent to the side hole near the stopper rod, measure the temperature and take samples from the side hole Add about 40-60kg of lower layer covering agent. When the lower nozzle of the shroud is submerged in molten steel and ...
Embodiment 2
[0021] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 38%, MgO22%, CaO1%, Fe 2 o 3 10%, Al 2 o 3 13%, S0.0005%, P0.001%, the rest is lost on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 47%, MgO1%, CaO38%, Fe 2 o 3 0.6%, Al 2 o 3 1%, S0.0004%, P≤0.0005%, and the balance is loss on ignition.
[0022] The method of use is as in Example 1.
Embodiment 3
[0024] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 41%, MgO18%, CaO0.6%, Fe 2 o 3 14%, Al 2 o 3 15%, S0.0007%, P0.0006%, the remainder is loss on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 50%, MgO2.5%, CaO41%, Fe 2 o 3 0.6%, Al 2 o 3 1%, S≤0.0006%, P0.0006%, and the balance is loss on ignition.
[0025] The method of use is as in Example 1.
[0026] In embodiment one, embodiment two, embodiment three, the variation of molten steel carbon content in ladle, tundish is as follows:
[0027]
Ladle, C%
Tundish, C%
Carbon increase / PPM
Embodiment one
0.0013
0.002
7
Embodiment two
0.0016
0.0018
2
Embodiment Three
0.0011
0.0016
5
[0028] In embod...
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