Method for detecting trace amount of nitrogen in gray pig iron

A gray cast iron, trace technology, applied in the field of detection of metal materials, can solve the problems of restricting the progress of the analysis process, long analysis cycle, high cost, etc., and achieve the effect of reasonable method, simple operation and high efficiency

Inactive Publication Date: 2016-07-20
上海市机械制造工艺研究所有限公司
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Problems solved by technology

[0002] According to the existing national standards, the determination of nitrogen content in gray cast iron mainly relies on the oxygen and nitrogen combined detector to analyze and measure by using the inert gas fusion thermal conductivity method. This method has high precision, but the analysis period is long (≥10min) and the cost is high. Restricts the progress of the enterprise to implement the entire analysis process

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  • Method for detecting trace amount of nitrogen in gray pig iron

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Embodiment Construction

[0014] A method for detecting trace amounts of nitrogen in gray cast iron, the steps of which are:

[0015] a. Sample preparation: First, quench the gray cast iron sample: heat it to 750°C, heat it for 3 hours and then take it out of the furnace to cool it in water to change the surface structure of the sample to a semi-white state, then cut and polish the sample and flatten it;

[0016] b. Immediately use the spark source atomic emission spectrometer for spectral analysis. The instrument parameters are selected as follows: the wavelength of the nitrogen analysis line is 149.270nm, the argon flushing time is 2s, the pre-combustion time is 10s, and the integration time is 13s; detect the content of trace nitrogen.

[0017] Therefore, the content of trace nitrogen elements in gray cast iron can be determined quickly and accurately.

[0018] The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited theret...

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Abstract

The invention discloses a method for detecting the trace amount of nitrogen in gray pig iron.The method includes the steps that a gray pig iron sample is subjected to quenching heat treatment, wherein the gray pig iron sample is heated to be at 750 DEG C, subjected to heat preservation for 3 hours, then taken out and cooled with water, the surface structure of the sample is changed to be in the half-white state, and then the sample is cut, polished and smoothened; spectral analysis is carried out immediately through a spark-source atomic emission spectrometer, wherein the parameters of the instrument include the nitrogen analysis wavelength of 149.270 nm, the argon washing time of 2 s, the pre-burning time of 10 s and the integral time of 13 s; detection is carried out to obtain the content of the trace amount of nitrogen.The detecting method is a method for rapidly and accurately measuring the trace amount of nitrogen elements in gray pig iron.

Description

technical field [0001] The invention relates to a method for detecting metal materials, in particular to a method for detecting trace elements. Background technique [0002] According to the existing national standards, the determination of nitrogen content in gray cast iron mainly relies on the oxygen and nitrogen combined detector to analyze and measure by using the inert gas fusion thermal conductivity method. This method has high precision, but the analysis period is long (≥10min) and the cost is high. It restricts the progress of the enterprise to implement the entire analysis process. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for quickly and accurately measuring trace nitrogen elements in gray cast iron. [0004] In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows: [0005] A method for detecting trace amoun...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/67G01N1/44G01N1/32
CPCG01N21/67G01N1/32G01N1/44
Inventor 王志强
Owner 上海市机械制造工艺研究所有限公司
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