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Method for smelting ultra-low-carbon steel

An ultra-low carbon steel, converter smelting technology, applied in the manufacture of converters and other directions, can solve the problems of plugging rod and nozzle channel blockage, etc., to reduce secondary oxidation, improve the quality of molten steel, and avoid blockage.

Inactive Publication Date: 2008-07-09
BENGANG STEEL PLATES
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Problems solved by technology

[0004] The task of the present invention is to provide a method for smelting ultra-low carbon steel that solves the problems of cost, stopper rod and nozzle channel blockage by adjusting the smelting sequence and controlling the composition of molten steel

Method used

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Embodiment 1

[0012] This method includes: hot metal pretreatment desulfurization, slag removal→converter smelting, slag blocking, tapping without deoxidation→LF top slag modification, desulfurization→RH vacuum forced decarburization, alloying, temperature adjustment→casting machine casting.

[0013] First, desulfurize the molten iron in the molten iron pretreatment device, that is, add a desulfurizer composed of magnesium powder and lime powder to the molten iron, the weight ratio between magnesium powder and lime powder is 1:3, and use stirring, slag removal, etc. Conventional steps, when the sulfur weight content in molten iron is less than or equal to 0.004%, it is transferred to a converter for smelting;

[0014] Converter smelting: Desulfurized molten iron is smelted into molten steel by blowing oxygen to reduce carbon in the converter. The oxygen blowing time is usually between 12-18 minutes. Phosphorus and further desulfurization and other harmful elements, after sampling and testin...

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Abstract

The invention relates to a process for smelting ultra-low-carbon steel, which comprises melted iron pretreatment desulfuration, converter smelt, LF furnace refining, RH vacuum process and continuous casting procedure in turn. Converter smelt tapping adopts non deoxidization tapping, steel which is tapped off is refined by LF ladle furnace before carried out melt iron vacuum decarburization processing, wherein refining is mainly used to proceed modifying property processing and further desulfuration and heating for top slag of melted iron, and the melted iron is reinforced with positive oxygen blowing decarburization after shifted into a RH vacuum container. The process can control carbon, nitrogen and sulfur in steel to preset objects which are required, and has excellent castability when a casting machine casted, thereby realizing casting by several furnaces.

Description

Technical field: [0001] The invention relates to a method for smelting ultra-low carbon steel. Background technique: [0002] Ultra-low carbon steel refers to special steel whose carbon content accounts for less than 0.01% of the total weight of the steel. The existing smelting technology can reduce the carbon content to the required level. Carbon is a simple and cheap way to increase the strength of steel. However, when the content of carbon in steel increases, some properties such as formability, weldability and toughness of steel will also weaken. With the basic and secondary effects of microalloying elements in steel, the concept of "austenite adjustment" is put forward, and the addition of microalloying elements in steel is consciously controlled to develop steel types with better performance, ultra-low Carbon steel is a steel grade that adopts microalloying technology to obtain high strength in low carbon steel and at the same time has the desired properties. [0003...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/068C21C5/28
Inventor 林东于华财宋满堂李明光王会忠
Owner BENGANG STEEL PLATES
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