Method for billet continuous casting machine to manufacture stainless steel billet with titanium ferrite

Abstract

The invention discloses a method for a billet continuous casting machine to manufacture a stainless steel billet with titanium ferrite. The method comprises the steps that quenching and tempering of AOD final slag are conducted, TiO2 refined slug is prepared by an LF furnace with high alkalinity, titanium is prepared by the LF furnace, and the continuous casting processes are conducted to the billet caster are achieved. According to the method for the billet continuous casting machine to manufacture the stainless steel billet with the titanium ferrite, the quenching and tempering of the AOD final slag are adopted to lay a great foundation for the LF furnace to refine the slag, the TiO2 refined slag is prepared by the LF furnace with the high alkalinity so that titanium inclusions can be separated out, technology of the LF furnace to prepare the titanium is improved so that saturated solvent degree of titanium nitride and stability of a titanium component can be improved, covering agenttechnology in the high alkalinity is adopted by the continuous casting of the billet continuous casting machine so that TiN can be separated, thus problems of flocculent flowing and casting blank included slag of the continuous casting machine are avoided, so that the billet continuous casting machine can successfully cast the stainless steel billet with the titanium ferrite. According to the stainless steel billet with titanium ferrite, the pass rate is greater than or equal to 97%, and the surface quality of wire milling is ensured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing a titanium-containing ferritic stainless steel billet by a billet continuous casting machine. Background technique [0002] Ferritic stainless steel has good corrosion resistance and is processed into parts with bright surfaces. It is widely used in household appliances, automobiles and other industries. Adding titanium to ferritic stainless steel can refine the grain size and further improve its corrosion resistance. [0003] Because titanium-containing ferrite contains certain titanium and aluminum elements, titanium elements are active and easily react with oxygen in molten steel and LF furnace refining slag, resulting in loss of titanium, which makes the alloying of titanium elements inaccurate. This requires multiple titanium alloys. Late blending of titanium alloys will shorten the processing time of inclusions, thereby increasing the r...

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Problems solved by technology

[0003] Titanium-containing ferrite contains a certain amount of titanium and aluminum elements. Titanium elements are active and easily react with molten steel and oxygen in LF furnace refining slag, resulting in loss of titanium and inaccurate alloying of titanium elements. This requires multiple titanium alloys. Late blending of titanium alloys will shorten the treatment time of inclusions, thereby increasing the risk of flocculation in the billet continuous casting machine; titanium-containing ferritic stainless steel molten steel will always contain a certain amount of nitrogen during the smelting process, which is formed by the reaction of nitrogen and titanium Titanium nitride has a certain saturation solubility in steel, and its saturation solubility is related to the temperature of molten steel and the content of various elements. If the content of titanium nitride in molten steel exceeds the saturation solubility, it will precipitate and cause flocculation in the billet continuous casting machine; Titanium-containing ferritic stainless steel molten steel has high viscosity and difficult inclusion treatment. Due to the small section of billet continuous casting machine, casting is difficult due to the poor fluidity of molten steel in the tundish.

[0004] At present, enterprises producing titanium-containing ferritic stainless steel at home and abroad adopt die casting and slab production. The above production methods are either high in cost (die casting) or restrict the rolling specifications of steel rolling (slab).

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