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Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes

An ultra-low carbon steel and process technology, which is applied in the improvement of process efficiency and the manufacture of converters, etc., can solve problems such as the decline of enterprise profits and the burden of capital enterprises for equipment renewal, and achieve the effect of saving investment and reducing capital investment.

Active Publication Date: 2011-05-18
NANYANG HANYE SPECIAL STEEL CO LTD
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Problems solved by technology

[0002] With the increasingly stringent requirements of the market for the quality grade of steel plates, the equipment and technology of iron and steel enterprises are constantly being updated. Industries that have been severely impacted have led to a decline in the profits of most companies, and equipment renewal funds have brought a great burden to companies. In order to cope with the adverse effects of the international financial crisis, accelerate structural adjustment, promote industrial upgrading, and realize low-cost strategies Iron and steel enterprises dig deep into the potential of existing equipment, which plays a very important role in enhancing the competitiveness of enterprises

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  • Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes

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Embodiment

[0018] The specific components are designed as follows:

[0019] C: 0.03~0.09, Si: ≤0.50, Mn: ≤1.80, P: ≤0.020, S: ≤0.010, AlS: 0.015~0.050, Ni+Cr+Mo≤1.0, Nb+V+Ti≤0.15, others are Fe and residual elements; this method is suitable for steel types that require a C content of less than 0.09, and the C content requirement can be achieved through this process. In order to achieve the above purpose, on the basis of the original low-carbon and ultra-low-carbon steel technology, the C content and temperature at the end of the converter are strictly controlled. React with carbon to remove the carbon in the steel to meet the low-carbon requirements, and then go through LF refining treatment to remove sulfur, oxygen and inclusions in the steel, and carry out alloying. After LF treatment, go through a VD vacuum treatment , to remove H, N and other gases in the steel to meet the requirements of clean steel. Combined with the chemical composition of steelmaking, the recrystallization term...

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Abstract

The invention discloses a method for producing low-carbon steel and ultra-low-carbon steel by vacuum decarburization (VD), ladle furnace (LF) and vacuum degassing (VD) processes. By the method, the requirement of smelting a low-carbon steel plate and an ultra-low-carbon steel plate is met by the conventional VD equipment and the like of enterprises on the premise of not adding Ruhrstahl Heraeus (RH) vacuum decarburization equipment and the like; and under the condition of low profit of the enterprises at the present stage, large investment in the large-scale starting of new equipment and equipment modification is avoided, investment is saved for companies, the conventional equipment is fully utilized, the capital investment of the enterprises at the present stage is greatly reduced, and sufficient preparation time is provided for starting the new equipment after the market situation and the profit of the enterprises are improved in the future.

Description

technical field [0001] The invention relates to the production of medium and thick plates, in particular to a method for producing low-carbon and ultra-low-carbon steels by adopting VD+LF+VD technology. Background technique [0002] With the increasingly stringent requirements of the market for the quality grade of steel plates, the equipment and technology of iron and steel enterprises are constantly being updated. Industries that have been severely impacted have led to a decline in the profits of most companies, and equipment renewal funds have brought a great burden to companies. In order to cope with the adverse effects of the international financial crisis, accelerate structural adjustment, promote industrial upgrading, and realize low-cost strategies It is very important for iron and steel enterprises to tap the potential of existing equipment to enhance their competitiveness. Contents of the invention [0003] Therefore, the object of the present invention is to pr...

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Application Information

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IPC IPC(8): C21C5/28C21C7/04C21C7/10C21C7/072C21D8/02
CPCY02P10/20
Inventor 刘庆波朱书成许少普张立新崔冠军雷文慧郭艳芳庞百鸣陈平张兵朱成杰徐璠
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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