Method for preventing sulphureous gear steel SAE8620H from clogging nozzle
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A SAE8620H, gear steel technology, applied in the field of thermodynamic equilibrium, can solve the problem of high melting point CaS blocking the nozzle and other problems, and achieve the effect of simple operation
Active Publication Date: 2014-12-17
SHOUGANG CORPORATION
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The usual treatment method is to add calcium element to the steel, and the steel contains sulfur. Af
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[0026] Tundish temperature: 1535°C. Where [Ca] / [Al]t=0.07, [Ca] / [S]=0.09, [O]: 0.0008%. The casting of 210 tons of molten steel went smoothly without clogging the nozzle.
[0028] Tundish temperature: 1538°C. Where [Ca] / [Al]t=0.06, [Ca] / [S]=0.08, [O]: 0.0009%. The casting of 210 tons of molten steel went smoothly without clogging the nozzle.
[0030] Tundish temperature: 1537°C. Where [Ca] / [Al]t=0.06, [Ca] / [S]=0.09, [O]: 0.0006%. The casting of 210 tons of molten steel went smoothly without clogging the nozzle.
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Abstract
A method for preventing sulphureous gear steel SAE8620H from clogging a nozzle belongs to the technical field of thermodynamic equilibrium between molten steel and inclusions. During casting of the sulphureous gear steel AE8620H, the phenomenon of nozzle clogging can happen because of halfway denaturation of the inclusion Al2O3 and generation of CaS. The gear steel AE8620H belongs to aluminium killed steel, and the general way to prevent the inclusion Al2O3 from clogging the nozzle on a continuous caster is to conduct calcium line feeding treatment to make the inclusion Al2O3 denature to generate a low-melting-point compound, which is a liquid inclusion and can congregate, grow and float up by blowing argon into molten steel so as to be removed. The gear steel SAE8620H has a higher sulfur content, and if the addition of calcium is too high in the calcium line feeding treatment process, CaS can be generated, so the content of calcium added into the steel needs to be controlled to reduce the generation conditions of CaS to avoid the phenomenon that the submersed nozzle is clogged in a continuous casting process.
Description
technical field [0001] The invention belongs to the technical field of thermodynamic balance between molten steel and inclusions, and in particular provides a method for preventing sulfur-containing gear steel SAE8620H from blocking a nozzle. Background technique [0002] Sulfur-containing gear steel SAE8620H is the steel grade in the standard of the American Society of Automotive Engineers. It is guaranteed that the oxygen content of the refined molten steel is ≤10ppm, and it is deoxidized by aluminum. At the same time, it also has a certain sulfur content of 0.010-0.020%. In the continuous casting process, it is easy to generate high melting point Al 2 o 3 Inclusions cause nozzle nodules. The usual treatment method is to add calcium element to the steel, and the steel contains sulfur. After adding calcium, it is easy to generate CaS with high melting point and block the nozzle. How to determine the content of calcium element added is very difficult from thermodynamic ca...
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