Stainless steel and preparation method thereof

Abstract

The invention provides stainless steel and a preparation method thereof. The method comprises the following steps of: preparing initial molten steel; injecting initial molten steel into an AOD refining furnace for refine so as to decarburize the initial molten steel and generate first slag and intermediate molten steel; removing the first slag from the intermediate molten steel; injecting the intermediate molten steel with the first slag removed into a VOD refining furnace; blowing oxygen into the VOD refining furnace to remove si from the intermediate molten steel and generate second slag andto-be-cast molten steel; calculating the amount of Si removed from the intermediate molten steel according to the second slag and the to-be-cast molten steel; and adjusting the pH value of the intermediate molten steel according to the amount of the removed Si to make sure that the content of aluminum in the to-be-cast molten steel is not larger than a preset value. The embodiment of the invention provides stainless steel and a preparation method thereof, and the stainless steel is higher in purity and can meet the purposes of special products.

Description

technical field [0001] The present application relates to the field of stainless steel, in particular to a stainless steel and a preparation method thereof. Background technique [0002] Ultra-pure stainless steel can achieve the purpose of ultra-pure stainless steel production by changing the composition and content of inclusions in ordinary stainless steel water. [0003] The process flow of ordinary stainless steel production is to adjust the level of inclusions in the quality control of stainless steel production products, relying on the treatment process of the refining part outside the furnace in the later stage, often due to the continuous increase of exogenous inclusions and the metallurgical process. The generated endogenous inclusions cannot be effectively adsorbed and removed, resulting in the purity of molten steel not meeting the purpose of special products (such as syringe needles, optoelectronics, etc.). [0004] It should be noted that the above introduction...

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Problems solved by technology

[0003] The process flow of ordinary stainless steel production is to adjust the level of inclusions in the quality control of stainless steel production products, relying on the treatment process of the refining part outside the furnace in the later stage, often due to the continuous increase of exogenous inclusions and the metallurgical process. The generated endogenous inclusions cannot be effectively adsorbed and removed, resulting in the purity of molten steel not meeting the purpose of special products (such as syringe needles, optoelectronics, etc.)

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