Preparation method of nitrogen-controlled nuclear-grade special steel

A special steel, nuclear grade technology, applied in the field of steel making, can solve the problems of high nitrogen and sulfur content and high cost, and achieve the effect of increasing desulfurization amount, low cost and reducing nitrogen absorption of molten steel

Pending Publication Date: 2021-03-26
广西永烨金属材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of high cost and high content of nitrogen and sulfur in steel in the current steelmaking process, the present invention provides a method for preparing nitrogen-controlled nuclear-grade special steel, which changes the desulfurization refining process and effectively reduces the content of sulfur and nitrogen in steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method for nitrogen-controlling nuclear-grade special steel, comprising the following steps:

[0022] (1) Send the raw materials to the blast furnace for smelting to obtain molten iron;

[0023] (2) The molten iron is sent to the converter, steel core aluminum is added during the deoxidation alloying stage, and slag is added during the period from the end of deoxidation alloying to the end of tapping to obtain a ladle containing the following mass fraction components: C 0.09%, Si 0.02%, Mn 0.06%, P0.014%, O 0.03%, N 0.045%;

[0024] (3) After the converter is completed, the ladle is sent to the argon blowing station, and the refining slag and deoxidizer are added according to the composition of the molten steel, and then sent to the LF furnace. First, the argon gas is blown strongly for 2 minutes, then the argon gas is blown softly for 3 minutes, and then the electrode is heated for 5 minutes. After energizing, argon blowing strongly for 6 minutes, then a...

Embodiment 2

[0029] Compared with Embodiment 1, the difference of this embodiment is:

[0030] The desulfurization process is specifically as follows: first, strong argon blowing for 4 minutes, then soft argon blowing for 3 minutes, and then electrode heating for 6 minutes. Blow with argon for 6 minutes, then softly blow with argon for 8 minutes.

[0031] After degassing in this example, molten steel containing the following mass fraction components was obtained: C 0.12%, Si 0.3%, Mn 1.5%, P 0.012%, S 0.004%, Als 0.025, Nb 0.02%, Ti 0.013%, Ni 0.2 %, O 0.002%, N 0.035%.

Embodiment 3

[0033] Compared with Embodiment 1, the difference of this embodiment is:

[0034] The desulfurization process specifically includes first blowing argon for 3 minutes, then argon soft blowing for 3 minutes, and then heating the electrode for 5 minutes. Strong argon blowing for 3 minutes, followed by soft argon blowing for 8 minutes.

[0035] After degassing in this example, molten steel containing the following mass fraction components was obtained: C 0.12%, Si 0.3%, Mn 1.5%, P 0.014%, S 0.003%, Als 0.025, Nb 0.02%, Ti 0.013%, Ni 0.2 %, O 0.002%, N 0.03%.

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PUM

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Abstract

The invention provides a preparation method of nitrogen-controlled nuclear-grade special steel. The method comprises the following steps that material-making slag is added before converter tapping toform desulfurized slag on the surface of tapping molten steel, thereby the sulfur content of the molten steel which enters an argon blowing station and the exposed surface of the molten steel are reduced, and then the molten steel absorbs less nitrogen; and after the sulfur content of the molten steel which enters the argon blowing station is reduced, the argon strong blowing time can be prolongedwithin the same refining time, so that the desulfurization rate is increased. The special steel prepared through the method is low in nitrogen and sulfur content and high in performance, and production can be implemented without adding extra additives or using a complex process.

Description

technical field [0001] The invention belongs to the technical field of steel making, and in particular relates to a preparation method of nitrogen-controlling nuclear-grade special steel. Background technique [0002] With the rapid development of the labor economy and the substantial increase in infrastructure construction, the consumption of steel has also increased tremendously. In the process of use, steel not only bears static load, but also bears certain dynamic load, and some parts of it bear alternating stress, and also bear the test of atmospheric climate change and corrosive medium under stress, so it is better The steel must have high strength, good plasticity, toughness, weldability and high fatigue strength, but high sulfur and nitrogen content in steel will deteriorate the toughness of the steel, reduce the plasticity of the steel, and lead to Performance deteriorates. The current continuous casting and rolling technology of steel has high requirements on the...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/064C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/08
CPCC21C7/06C21C7/064C21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/08
Inventor 张瑞杰冉辉卓志昊
Owner 广西永烨金属材料科技有限公司
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