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Method for adding nitrogen into stainless steel used for thermonuclear fusion reactor

A thermonuclear fusion and stainless steel technology, which is applied in the field of nitrogen addition of stainless steel, can solve the problems of high inclusion content in molten steel and difficulty in controlling nitrogen content within the target range, and achieve the effect of avoiding high inclusion content in molten steel

Active Publication Date: 2012-01-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] ITER (International Thermonuclear Experimental Reactor International Thermonuclear Experimental Reactor) is a new type of thermonuclear experimental reactor project participated by seven countries and regions including the European Union, the United States, China, Japan, Russia, India, and South Korea. In the range of 0.06%-0.25%, the existing method of adding nitrogen to stainless steel for thermonuclear fusion reactors adopts the method of adding nitrogen to alloys, which is likely to cause high inclusion content in molten steel and it is difficult to control the nitrogen content within the target range

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The stainless steel grade of the present embodiment is 316LN, and the mass percent requirement of its composition is:

[0035] 0

[0036] The steps of this embodiment are as follows:

[0037] It is smelted and produced by 18-ton AOD furnace and 18-ton LF furnace.

[0038] 17.32 tons of electric furnace molten steel is blended into the AOD furnace, and the composition of the electric furnace molten steel is as follows (weight percentage):

[0039] C: 1.49% Si: 0.13% Mn: 0.45% P: 0.016% S: 0.003%

[0040] Cr: 15.71% Ni: 12.93% Mo: 2.15% N: 0.03% Co: 0.03%

[0041] Nb: 0.01% Ta: 0.01%

[0042] The rest is Fe and unavoidable impurities.

[0043] The AOD furnace operates as follows:

[0044] Time Operation content

[0045] 17:45 After adding steel, blow gas O on the botto...

example 2

[0070] The stainless steel grade of this embodiment is 316L(N)-IG. The mass percentage requirements of its ingredients are;

[0071] 0

[0072] The steps of this embodiment are as follows:

[0073] It is smelted and produced by 18-ton AOD furnace and 18-ton LF furnace.

[0074] 17.32 tons of electric furnace molten steel is blended into the AOD furnace, and the composition of the electric furnace molten steel is as follows (weight percentage):

[0075] C: 1.52% Si: 0.23% Mn: 0.77% P: 0.017% S: 0.003%

[0076] Cr: 16.33% Ni: 13.08% Mo: 2.15% N: 300ppm The remainder is Fe and unavoidable impurities.

[0077] The AOD furnace operates as follows:

[0078] Time Operation content

[0079] 3:15 After mixing steel, blow O on the bottom side 2 :N 2 =0:400m 3 / h, temperature measur...

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Abstract

The invention relates to a method for adding nitrogen into stainless steel used for a thermonuclear fusion reactor. The method comprises the following steps of: I, pouring molten steel meeting requirements of an AOD (argon oxygen decarburization) furnace into the AOD furnace to be smelted; II, carrying out a process for controlling nitrogen component of the AOD furnace, namely blowing argon and stirring before tapping, wherein argon blowing-in amount target value Y is calculated according to the following formula: Y=17.5e-0.002X, X (ppm) is the target nitrogen content of a product, and Y (cubic meter per ton of steel) is amount of argon blown into the molten steel; and III, carrying out an LF (ladle furnace) process, comprising the steps of pouring the molten steel into an LF, controlling LF bottom blowing nitrogen flow to be 0.2-1.0L / min per ton of steel when the nitrogen content of the molten steel is at the target range requirement, carrying out LF furnace nitrogen bottom blowing to increase nitrogen content when the nitrogen content of the molten steel is lower than target requirement, wherein the amount of nitrogen blown into the molten steel is calculated according to the following formula: W=K / (2.0*m), K is nitrogen content added value required by the product, m is time for blowing nitrogen, and W is flow rate of nitrogen blown into the molten steel; and tapping when composition requirement of the molten steel is met. By applying the method for adding nitrogen provided by the invention, the nitrogen content can be easily controlled to be within the target range.

Description

technical field [0001] The invention provides a method for increasing nitrogen by stainless steel used in thermonuclear fusion reactors. Background technique [0002] ITER (International Thermonuclear Experimental Reactor International Thermonuclear Experimental Reactor) is a new type of thermonuclear experimental reactor project participated by seven countries and regions including the European Union, the United States, China, Japan, Russia, India, and South Korea. In the range of 0.06%-0.25%, the existing method of increasing nitrogen by stainless steel for thermonuclear fusion reactors adopts the method of increasing nitrogen by alloy, which may easily cause high content of inclusions in molten steel and it is difficult to control the nitrogen content within the target range. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing methods for increasing nitrogen by stainless steel for thermonuclear fusion reactors, the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/52C21C7/072
Inventor 刘承志
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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