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Method for measuring trace amount calcium in steel

A trace and microwave digestion technology, used in the field of trace calcium determination in steel, can solve the problems of high blank value, large amount of reagents, unstable measurement results, etc., to achieve accurate measurement results, reduce measurement blanks, and good consistency. Effect

Inactive Publication Date: 2008-12-03
WUHAN IRON & STEEL (GROUP) CORP
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Problems solved by technology

When this method is used for measurement, the amount of reagents used is large, and the reagents, solvents (generally water) and even the working environment (air, wall paint, dust) contain a certain amount of calcium, which directly leads to a blank in the measurement process. The value is high, and the measurement result of trace calcium in the sample is unstable, which leads to the uncertainty of the measurement result, and cannot accurately measure the trace calcium in steel

Method used

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  • Method for measuring trace amount calcium in steel
  • Method for measuring trace amount calcium in steel
  • Method for measuring trace amount calcium in steel

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Experimental program
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Effect test

Embodiment 1

[0027] 1 using the instrument

[0028] IRIS Advantage full-spectrum direct-reading plasma emission spectrometer (Thermo Electric Company of the United States); microwave digestion system, MILESTONE ETHOS TC high-pressure microwave digestion furnace (Italy);

[0029] 2. Using Reagents

[0030] All reagents used were of superior grade;

[0031] The 1.000mg / mL Ca standard working solution was prepared with calcium carbonate (99.99%). During the measurement, dilute with aqua regia step by step to form a standard working solution with a calcium concentration of 0.0ug / mL, 0.1ug / Ml, 0.2ug / mL, 0.5ug / mL, and 1.0ug / mL.

[0032] 3. Calibration curve drawing

[0033] Use the standard working solution of calcium, measure under the working conditions of the instrument in Table 1, and the computer automatically draws the calibration curve, see figure 1 .

[0034] Table 1 Working conditions of the spectrometer

[0035]

[0036] Table 2 Conditions of microwave digestion

[0037]

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Abstract

The invention relates to a method for measuring trace calcium in steel. The method is used for measuring the trace calcium in steel by combining a microwave digestion method with an inductive coupling plasma atomic emission spectrograph. The method comprises the following steps: a sample solution which is digested by microwave is cooled and is subjected to constant volume in a measuring flask; standard solutions with different calcium concentrations are prepared and added with acid accordant with the pre-processed sample, and are subjected to constant volume in measuring flasks of the same size; the calcium spectral line intensities in the standard solutions with different calcium concentrations are respectively measured in the inductive coupling plasma atomic emission spectrograph, and a working curve is drawn by taking the element calcium concentrations as the abscissa and taking the spectral line intensities as the ordinate; under the same conditions with the steps, the calcium concentration in the sample solution is measured, and the volume concentration of the calcium element in the sample is calculated according to the working curve. The method has the advantages of simple and fast operation and accurate and reliable measuring result.

Description

technical field [0001] The invention relates to a method for measuring steel, in particular to a method for measuring trace calcium in steel. Background technique [0002] The content of calcium in steel is very small, but it can play a very subtle role. After adding calcium to the steel, on the one hand, it reduces the brittleness of the steel, improves the ductility, toughness, fatigue resistance of the steel and improves the cutting performance of the steel. On the other hand, calcium reacts with oxygen in the inclusions dissolved in steel, reducing the solubility of sulfide in steel, making it precipitate in the initial stage of solidification of molten steel, in a spherical shape, reducing the impact on the mechanical properties of steel. Based on these advantages of adding calcium to steel, the research on new steel types now pays more attention to the accurate measurement of calcium in steel. At present, the determination of trace calcium in iron and steel samples m...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/44
Inventor 李洁陈士华张穗忠程运娥贾晖杨艳李杰张春兰
Owner WUHAN IRON & STEEL (GROUP) CORP
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