Method for analyzing nitrogen in metal sample, apparatus for analyzing nitrogen in metal sample, method for adjusting nitrogen concentration in molten steel, and method for manufacturing steel
First Claim
1. A method for analyzing nitrogen in a metal sample containing a nitrogen component, the method comprising:
- performing impulse heating on the metal sample in an argon atmosphere to melt the metal sample and gasify the nitrogen component, anddetermining the amount of nitrogen gas present in the argon gas by using a gas discharge optical emission method.
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Accused Products
Abstract
Provided are a method for analyzing nitrogen in a metal sample, an apparatus for analyzing nitrogen in a metal sample, a method for adjusting nitrogen concentration in molten steel, and a method for manufacturing steel. The method includes: a melting process in which a metal sample containing a nitrogen component is melted in an argon gas atmosphere by performing impulse heating to gasify the nitrogen component; and an analyzing process in which nitrogen content in the metal sample is determined by analyzing nitrogen gas generated in the melting process and the argon gas by using a gas discharge optical emission method. By analyzing the nitrogen concentration of a sample taken from molten steel by using the analysis method described above, and by determining treatment conditions for adjusting nitrogen concentration on the basis of the nitrogen analysis value derived by the analysis, nitrogen concentration in molten steel is adjusted.
3 Citations
21 Claims
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1. A method for analyzing nitrogen in a metal sample containing a nitrogen component, the method comprising:
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performing impulse heating on the metal sample in an argon atmosphere to melt the metal sample and gasify the nitrogen component, and determining the amount of nitrogen gas present in the argon gas by using a gas discharge optical emission method. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21)
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5. An apparatus for analyzing nitrogen in a metal sample containing a nitrogen component, the apparatus comprising:
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an impulse furnace in which the metal sample is melted in an argon gas atmosphere to gasify the nitrogen component; an argon gas feeding system through which argon gas is fed into the impulse furnace; a discharge optical emission system that induces the discharge optical emission of nitrogen gas generated in the impulse furnace and of argon gas in the impulse furnace by using a gas discharge optical emission method; and a photometrical analysis system that determines the intensity of emission induced by the discharge optical emission system to determine nitrogen content in the metal sample. - View Dependent Claims (6, 7, 8, 15, 16)
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Specification