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Detection method for carbon content of globular graphite cast iron

A technology of ductile iron and detection method, applied in the field of inspection and detection, can solve the problems of large fluctuation of carbon content detection data, loss of free graphite, low accuracy, etc. Effect

Inactive Publication Date: 2019-04-02
SHANNXI DIESEL ENGINE HEAVY IND
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Problems solved by technology

[0003] At present, when sampling ductile iron, most of the graphite in the micrometallographic structure of the sample is spherical. During the sampling process using drill cuttings or turning chips, free graphite will escape, resulting in large fluctuations in the detection data of carbon content. Not very accurate

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  • Detection method for carbon content of globular graphite cast iron
  • Detection method for carbon content of globular graphite cast iron

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] A method for detecting the carbon content of ductile iron, comprising the steps of sampling, sample preparation, analysis, and measurement value reading, characterized in that: in the sampling step, a completely white sample of ductile iron is taken in a liquid state for analysis and reading of measured values.

[0016] 1) Sampling: After the molten iron is spheroidized, take a white sample with a thickness of 1.5mm and a diameter of about 30mm in the liquid state. Such as figure 2 .

[0017] 2) Sample preparation: Grind the upper and lower surfaces of the white sample to remove surface oxides, leaving a thickness of about 0.5mm, and use a cleaning tool to smash the sample into pieces with a size of 2mm-4mm. Accurately weigh the flux and pure iron according to the operation requirements of the analytical instrument, and the carbon content of ...

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Abstract

The invention discloses a detection method for the carbon content of globular graphite cast iron. The method comprises the steps of sampling, preparing samples, analyzing and reading a measurement value. The method is characterized in that a complete white specimen of the globular graphite cast iron under a liquid state is taken in a sampling process, and analysis and measurement value reading arecarried out. By use of the method, a sample state is changed, i.e., the complete white specimen of the globular graphite cast iron under the liquid state is taken, so that graphite in a sample microscopic metallographic structure completely exist in a Fe3C form, free state graphite is avoided, so that a graphite escape problem is solved, the volatility of the detection data of the carbon contentof globular graphite cast iron is lowered, and detection data accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of inspection and detection, and in particular relates to a method for detecting the carbon content of nodular cast iron. Background technique [0002] At present, the detection of the carbon content of ductile iron mostly adopts the method of mechanical processing to take samples from the tensile sample or the casting body, and then uses the infrared absorption method to measure the carbon content of the samples after combustion in an induction furnace. [0003] At present, when sampling ductile iron, most of the graphite in the micrometallographic structure of the sample is spherical. During the sampling process using drill cuttings or turning chips, free graphite will escape, resulting in large fluctuations in the detection data of carbon content. Not very accurate. Contents of the invention [0004] In order to solve the above technical problems, the present invention provides a method for detecting t...

Claims

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Application Information

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IPC IPC(8): G01N33/2022G01N21/3563
CPCG01N21/3563G01N33/20G01N2021/3572
Inventor 宫显辉李飞郭敏李宏伟王敏刚
Owner SHANNXI DIESEL ENGINE HEAVY IND
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