LF furnace nitrogen-control refining method

A slag and fast technology, applied in the field of nitrogen-controlled refining in LF furnace, can solve the problems of plasticity and toughness reduction, plasticity and toughness reduction, etc., and achieve the effect of ensuring deep drawing performance, reducing the degree of damage, and eliminating the phenomenon of yield point extension.

Inactive Publication Date: 2019-02-15
WUHU XINXING DUCTILE IRON PIPES
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Problems solved by technology

Due to the aging effect of nitrogen, the hardness and strength of steel increase, but the plasticity and toughness decrease, especially in the case of deformation aging, the decrease in plasticity and toughness is more significant

Method used

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  • LF furnace nitrogen-control refining method

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0017] The present invention provides a kind of LF furnace controlled nitrogen refining method, the method comprises:

[0018] Step 1, the step of melting the slag, adopts short arc and high power to quickly melt the slag;

[0019] Step 2, the rapid temperature rise step, after the slag material is melted, the electric arc is properly elongated and the input power is increased.

[0020] According to the above technical scheme, the present invention implements the specific method for controlling nitrogen in LF refining, the nitrogen content in the steel is effectively controlled, and the nitrogen content in the outbound LF refining is controlled below 50ppm, whi...

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Abstract

The invention discloses an LF furnace nitrogen-control refining method. The method comprises the steps that firstly, slag is melted, specifically, slag is melted rapidly through short arc and high power; and secondly, temperature is rapidly increased, specifically, after slag is melted, arc is lengthened properly, and input power is increased. Through the LF furnace nitrogen-control refining method, the nitrogen content in steel can be effectively controlled, and the deep drawing performance of the steel is ensured.

Description

technical field [0001] The invention relates to an LF furnace controlled nitrogen refining method. Background technique [0002] Please briefly describe the existing technology, and specifically point out what are the shortcomings of the existing technology? Since it is difficult to reduce nitrogen and control nitrogen in the subsequent process, nitrogen control in LF refining is more critical. Nitrogen will cause quenching aging and deformation aging of carbon steel, which will have a significant impact on the properties of carbon steel. Due to the aging effect of nitrogen, the hardness and strength of steel increase, but the plasticity and toughness decrease, especially in the case of deformation aging, the decrease in plasticity and toughness is more significant. Therefore, for common low-alloy steels, aging phenomena are detrimental, and thus nitrogen is a detrimental element. Contents of the invention [0003] The purpose of the present invention is to provide a LF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/072C21C7/076
CPCC21C7/0056C21C7/072C21C7/076Y02P10/20
Inventor 王文培张洪彪李海胡岗范石伟介瑞华
Owner WUHU XINXING DUCTILE IRON PIPES
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