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Hot rolled ribbed steel bar nitrogen increasing method

A technology of hot-rolled ribbed steel bars and nitrogen, applied in the direction of manufacturing converters, etc., can solve the problems of difficult research and development of vanadium-nitrogen alloys, restricting the use of vanadium-nitrogen alloys, and high cost of microalloying, and achieves improved deoxidation strength, stable performance, cost reduction effect

Inactive Publication Date: 2020-10-09
JIUJIANG PINGGANG STEEL
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Problems solved by technology

In the production process, the research and development of vanadium-nitrogen alloy is very difficult, and the price is about twice as high as that of ferro-vanadium. The cost of micro-alloying molten steel with vanadium-nitrogen alloy is relatively high, which restricts the use of vanadium-nitrogen alloy

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Embodiment Construction

[0014] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0015] A method for increasing nitrogen in hot-rolled ribbed steel bars. The method is to advance the time of the molten steel deoxidation process to one-fifth of the tapping process of the converter during the tapping process of the converter, and to control the nitrogen flow rate of the bottom blowing of the ladle. To stabilize the amount of nitrogen added to molten steel, specifically include the following steps:

[0016] (1) The deoxidation of the converter is moved forward. When the converter is tapped to one-fifth, silicon carbide and ferrosilicon are added for deoxidation. Before the tapping reaches two-fifths, the silicon carbide and ferrosilicon are added to complete the deoxidation process;

[0017] (2) Control the nitrogen gas to blow a...

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Abstract

The invention discloses a hot rolled ribbed steel bar nitrogen increasing method. According to the hot rolled ribbed steel bar nitrogen increasing method, during the molten steel tapping process of aconverter, the time of the molten steel deoxygenation technology is advanced to the one fifth stage of the molten steel tapping process of the converter, and the molten steel nitrogen increasing quantity is stabilized through controlling the bottom blowing nitrogen flow rate of a steel ladle. With adoption of the hot rolled ribbed steel bar nitrogen increasing method, the molten steel deoxygenation time is advanced, the molten steel deoxygenation strength of the hot rolled ribbed steel bar is improved, the molten steel nitrogen absorbing capacity is improved, the problem that the nitrogen content in molten steel is unstable during the production process to cause that the performance of the hot rolled ribbed steel bar fluctuates after microalloying through using ferrovanadium is solved, theperformance stability of the hot rolled ribbed steel bar is greatly improved, and the producing cost of the hot rolled ribbed steel bar is reduced.

Description

technical field [0001] The invention relates to a method for adding nitrogen to a hot-rolled ribbed steel bar. Background technique [0002] Nitrogen in hot-rolled ribbed steel bars can combine with vanadium, and promote the precipitation of carbon, vanadium, and nitrides in steel through microalloying of vanadium and nitrogen, and play the role of precipitation strengthening and grain refinement. At present, hot-rolled ribbed steel bars are not allowed to pass through water to increase the strength of steel bars, so adding vanadium-nitrogen alloys to improve steel strength has become one of the main methods. The nitrogen content in molten steel is mainly controlled by adding a vanadium-nitrogen alloy. The yield of vanadium and nitrogen in the vanadium-nitrogen alloy is stable, which can reduce the performance fluctuation of the steel. In the production process, the research and development of vanadium-nitrogen alloy is difficult, and the price is about twice as high as tha...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/06C21C7/00
CPCC21C5/28C21C7/00C21C7/06
Inventor 杨创煌肖太平
Owner JIUJIANG PINGGANG STEEL
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