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A method of controlling nitrogen content in high nitrogen steel

A technology of nitrogen content and high nitrogen steel is applied in the field of controlling nitrogen content in high nitrogen steel, which can solve the problems of inability to achieve precise nitrogen control, unstable nitrogen absorption rate of nitrogen alloys, and the cost of large alloys, so as to enhance the market. Competitiveness, improving molten steel cleanliness, and reducing processing costs

Active Publication Date: 2018-10-16
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the addition of nitrided alloys with nitrogen usually has the following disadvantages: the nitrogen absorption rate of nitrided alloys is unstable, and precise nitrogen control cannot be achieved, which increases the cost of the alloy; in addition, when adding nitrided alloys, it also Other impurity elements and inclusions brought in

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  • A method of controlling nitrogen content in high nitrogen steel

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Effect test

Embodiment 1

[0043] Embodiment 1 of the present invention controls the method for nitrogen content in high nitrogen steel, described method comprises the steps:

[0044] S101: Install a system for supplying nitrogen or argon after the converter;

[0045] S102: Obtain the carbon and oxygen product of the converter of the previous day;

[0046] S103: According to the carbon and oxygen product of the converter, set the type and flow rate of the bottom blowing gas of the molten steel car during the tapping process and the strong stirring process.

[0047] In the step S101, in the embodiment of the present invention, a system for supplying nitrogen or argon is installed on the molten steel car behind the converter, and the system includes a gas pipeline, a cut-off valve and a flow meter. The system is connected to the primary program of the control system to realize automatic and manual control.

[0048] In the step S103, when the carbon-oxygen product of the converter ≥ 0.0030 the previous d...

Embodiment 2

[0052] Embodiment 2 of the present invention controls the method for nitrogen content in high nitrogen steel, described method comprises the following steps:

[0053] S201: Install a system for supplying nitrogen or argon after the converter furnace;

[0054] S202: Obtain the carbon and oxygen product of the converter of the previous day;

[0055] S203: According to the carbon and oxygen product of the converter, set the type and flow rate of the bottom blowing gas of the molten steel car during the tapping process and the strong stirring process;

[0056] S204: Nitrogen is used as the circulating gas in the RH refining process, and the balance vacuum degree is set according to the target nitrogen content of the finished steel.

[0057] In the step S201, in the embodiment of the present invention, a system for supplying nitrogen or argon is installed on the molten steel car behind the converter, and the system includes a gas pipeline, a cut-off valve and a flow meter. The sy...

Embodiment 3

[0065] Embodiment 3 of the present invention controls the method for nitrogen content in high nitrogen steel, described method comprises the following steps:

[0066] S301: Install a system for supplying nitrogen or argon after the converter;

[0067] S302: Obtain the carbon and oxygen product of the converter of the previous day;

[0068] S303: According to the carbon and oxygen product of the converter, set the type and flow rate of the bottom blowing gas of the molten steel car during the tapping process and the strong stirring process;

[0069] S304: Nitrogen is used as the circulating gas in the RH refining process, and the balance vacuum degree is set according to the target nitrogen content of the finished steel;

[0070] S305: In the RH refining process, take a process sample of molten steel to test the nitrogen content, and select the final circulating gas parameters according to the difference between the nitrogen content value obtained from the test and the final t...

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Abstract

The invention provides a method for controlling content of nitrogen in high-nitrogen steel. The method comprises the steps as follows: a system for providing nitrogen or argon is mounted behind a converter; the converter carbon-oxygen equilibrium one day earlier is acquired; and types and flows of molten steel ladle transfer car bottom blowing gases in the steel tapping process and the strong stirring process are set according to the converter carbon-oxygen equilibrium. According to the method, the system for providing the nitrogen or the argon is mounted behind the converter, free switching of the molten steel ladle transfer car bottom blowing gases behind the converter and accurate control on the flows are realized, and conditions are created for nitrogen control on the bottom blowing gases behind the converter; nitrogen control parameters in the steel tapping process and the strong stirring process corresponding to different converter conditions by using carbon-oxygen equilibrium one day earlier as indexes are found out; and no nitralloy is added, that is, the content of the nitrogen in the steel can be controlled accurately, and the requirement of the high-nitrogen steel is met.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for controlling nitrogen content in high nitrogen steel. Background technique [0002] With the high-speed and heavy-duty of my country's railways, the requirements for quality indicators such as high-strength high-nitrogen steel strength, atmospheric corrosion resistance, and low-temperature impact performance are becoming higher and higher. The control of nitrogen content in steel determines the quality of steel such as yield strength and low temperature impact performance of steel. If the nitrogen content is controlled too low, the yield strength of the steel cannot meet the requirements; if the nitrogen content is controlled too high, [N] in the molten steel will be in a free state during the pouring process, and subcutaneous air bubbles will easily occur, which will cause longitudinal cracks on the steel surface, Transverse fissures and subcutaneous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/10
CPCC21C7/00C21C7/0068C21C7/10
Inventor 赵艳宇彭开玉张涛胡卫东闵常杰王建辉黄桂斌周立武
Owner BEIJING SHOUGANG CO LTD
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