A kind of trapezoidal nitrogen blowing nitrogen control method

A trapezoidal, nitrogen technology, applied in the field of metallurgy, can solve the problems of unfavorable production continuity and high efficiency, secondary pollution of molten steel, etc., and achieve the effect of reducing production costs, reducing smelting costs, and solving precise control.

Active Publication Date: 2022-04-19
NANJING IRON & STEEL CO LTD
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Problems solved by technology

[0002] Nitrogen control of nitrogen-containing steel is very important. At present, the conventional method of increasing nitrogen is to increase nitrogen with nitrided alloy or wire. These methods are usually added after the molten steel is vacuum treated, which will cause secondary pollution to the molten steel; and adding It takes a period of time for the uniformity of post-nitrogen, which is unfavorable to the continuity and high efficiency of production

Method used

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  • A kind of trapezoidal nitrogen blowing nitrogen control method
  • A kind of trapezoidal nitrogen blowing nitrogen control method
  • A kind of trapezoidal nitrogen blowing nitrogen control method

Examples

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Embodiment

[0019] In this embodiment, the steel grade C38N2 is taken as an example. The target element content of the steel grade is as follows: the nitrogen content is 140 ppm, the hydrogen content is below 2.0 ppm, and the oxygen content is below 10 ppm.

[0020] The trapezoidal nitrogen blowing and nitrogen control method of the present invention is used for production. The process implementation is divided into two processes, which need to be completed in sequence. The process control schematic diagram is as follows figure 1 shown; among them, figure 1 The meanings of the two data in each section of the blowing segment are the blowing flow rate and the blowing time. The data in the upper row of each segment represents the blowing flow rate, and the data in the next row represents the blowing time.

[0021] Among them, there is no fixed requirement before the molten steel enters the LF process. According to the end point of the electric furnace and the waiting time for smelting, there...

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Abstract

The invention discloses a trapezoidal nitrogen blowing and nitrogen control method, which includes LF refining process and VD vacuum degassing process; wherein, the LF refining process includes sequentially blowing argon and nitrogen into molten steel; the VD vacuum degassing process includes vacuuming stages, In the vacuum maintenance stage and the normal pressure stage, the molten steel is blown with nitrogen for the first time in the vacuum pumping stage, the second nitrogen blowing, the first argon blowing in the vacuum maintenance stage, and the second argon blowing in the normal pressure stage; finally to obtain nitrogen-containing steel. The invention can realize precise control of nitrogen element, can solve the problem of precise control of nitrogen in molten steel and secondary pollution of molten steel, and does not affect the control of hydrogen and oxygen in molten steel.

Description

technical field [0001] The invention relates to a nitrogen control method in the field of metallurgy, in particular to a trapezoidal nitrogen blowing nitrogen control method. Background technique [0002] Nitrogen control of nitrogen-containing steel is very important. At present, the conventional method of increasing nitrogen is to increase nitrogen with nitrided alloy or wire. These methods are usually added after the molten steel is vacuum treated, which will cause secondary pollution to the molten steel; and adding It takes a period of time for the uniformity of post-nitrogen, which is unfavorable to the continuity and high efficiency of production. Contents of the invention [0003] Purpose of the invention: The purpose of the invention is to provide a trapezoidal nitrogen blowing nitrogen control method, which solves the problem of precise nitrogen control in nitrogen-containing steels, and at the same time matches the production flow without affecting the control of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/10
CPCC21C7/072C21C7/10
Inventor 杨利委周剑王国柱王震李德波陆斌
Owner NANJING IRON & STEEL CO LTD
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