Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method

Abstract

The invention provides a method for improving the high-carbon high-manganese steel converter smelting endpoint carbon content and a steelmaking method. The method comprises: during tapping of semisteel into a ladle or after adding the semisteel into a steelmaking converter, adding 3.0-8.0kg / (t semisteel) ferrosilicon into the semisteel; putting an oxygen lance to perform oxygen blowing smelting, and adding related slag making materials and alloys according to blowing requirements, adding 10.0-30.0kg / (t semisteel) ferromanganese, conducting reblowing, controlling the endpoint carbon content of molten steel at 0.30%-0.50%, taking out the oxygen lance, and stopping blowing. The semisteel is the molten steel obtained by subjecting vanadium-containing molten steel to a vanadium recovery converter or dephosphorization converter to undergo blowing, has a C content of 3.20%-3.80% C and an Si content of 0.001%-0.05%, and the temperature of the semisteel is 1320DEG C-1380DEG C. The method provided by the invention shortens the initial slag forming time, improves the steelmaking and slagging speed, enhances the endpoint carbon content under the condition of ensuring the molten steel temperature during tapping, effectively controls the steel consumption during steelmaking, and avoids the low utilization problem of carbon recarburization materials.

Description

technical field [0001] The invention belongs to the technical field of semi-steel steelmaking, and specifically relates to a method for increasing the carbon content at the end point of a converter for smelting high-carbon and high-manganese steel and a steelmaking method using the method. Background technique [0002] Generally speaking, semi-steel is obtained after vanadium-containing molten iron ore (for example, vanadium-titanium magnetite) smelted in blast furnace is smelted in vanadium extraction converter or dephosphorization converter. The semi-steel is characterized by low carbon (average around 3.6%), low in silicon (below 0.01%), low in manganese (below 0.05%), insufficient heat source, low content of slagging elements, higher temperature than molten iron, low early oxidation of slag and difficulty in initial slagging . When the semi-steel is used for smelting, since the exothermic elements in the semi-steel are less than that of molten iron, in order to ensure t...

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Problems solved by technology

[0007] For example, one of the purposes of the present invention is to solve the problem of low carbon content at the end point caused by the poor physical temperature of semi-steel steelmaking when steelmaking plants use semi-steel steelmaking, and to provide a method for improving the efficiency of smelting high-carbon and high-manganese steels. Method for carbon content at converter end point