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Method for determining mass content of titanium in steel

A mass content, to-be-detected technology, applied in measurement devices, preparation of samples for testing, measurement of color/spectral properties, etc., can solve the problems of inaccurate detection, poor accuracy and precision, hydrolysis and aging of tetravalent titanium, etc. Achieve reproducible and reproducible results with easy operation

Active Publication Date: 2021-03-26
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The prior art adopts the diantipyrine methane spectrophotometric method to measure the titanium content in steel. This method often splashes when the iron-based sample is decomposed and emits sulfuric acid fumes when the sample is decomposed in the measurement process; the titanium mass content> 2% When salt is dissolved, tetravalent titanium is hydrolyzed and aged; the interference method to eliminate molybdenum is cumbersome and the effect is not good; the titanium content in steel with niobium mass content > 2% cannot be accurately detected
In summary, the accuracy and precision of the detection method for titanium content in steel provided by the prior art are relatively poor

Method used

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  • Method for determining mass content of titanium in steel
  • Method for determining mass content of titanium in steel
  • Method for determining mass content of titanium in steel

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preparation example Construction

[0031] In the present invention, the preparation method of the decomposition liquid preferably includes:

[0032] Mix the sample to be tested with the mixed acid of nitric acid and hydrochloric acid, heat at low temperature until the sample to be tested is completely decomposed, then add the second sulfuric acid solution, heat until sulfuric acid fumes are emitted, and cool to room temperature; then add water, heat to boil, cool to room temperature; then add the third sulfuric acid solution and dilute with water to obtain the mother liquor (decomposition liquid).

[0033] In the present invention, the heating and boiling is preferably heating and boiling until the solution is clear and transparent; when the tungsten mass content of the sample to be detected is high, the solution becomes turbid when heated and boiled, preferably heated and boiled for 30-60s, more preferably 35-55s, most preferably Preferably it is 40-50s. In the present invention, the room temperature is prefe...

Embodiment

[0076] Detect the mass content of titanium in the sample to be tested according to the following method:

[0077] The samples to be tested were prepared in accordance with GB / T 20066 "Sampling and Sample Preparation Methods for Determination of Chemical Composition of Steel and Iron".

[0078] Referring to Table 1, weigh the sample to be tested m (g), accurate to 0.1 mg; and add the corresponding amount of acid.

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Abstract

The invention provides a method for determining the mass content of titanium in steel, which comprises the following steps: decomposing a sample to be detected with acid to obtain a decomposition solution; reducing the decomposition solution with ascorbic acid in a sulfuric acid solution to obtain a reduction solution; reacting the reducing solution with diantipyrine methane to obtain a color developing solution; testing the absorbance of the developing solution; and calculating the mass content of titanium in the to-be-detected sample according to the absorbance result obtained by testing. According to the detection method, sulfuric acid is added when the sample is decomposed, and splashing is avoided when sulfuric acid smoke is emitted when the iron-based sample is decomposed; when it isdetected that the mass content of titanium is larger than 2% of sample soluble salt, tetravalent titanium is not hydrolyzed and aged; interference of molybdenum and niobium is reduced by controllingthe adding amount of sulfuric acid in the developing solution, and interference of molybdenum and niobium is corrected by using an interference correction coefficient. The detection method provided bythe invention is simple and convenient to operate, the reproducibility and reproducibility of the detection result are good, and the accuracy and precision of the detection result exceed the requirement that the allowable difference probability is less than or equal to 1%.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis of steel and iron alloys, in particular to a method for measuring the mass content of titanium in steel. Background technique [0002] The prior art adopts the diantipyrine methane spectrophotometric method to measure the titanium content in steel. This method often splashes when the iron-based sample is decomposed and emits sulfuric acid fumes when the sample is decomposed in the measurement process; the titanium mass content> 2% When salt is dissolved, tetravalent titanium is hydrolyzed and aged; the interference method for eliminating molybdenum is cumbersome and the effect is not good; the titanium content in steel with niobium mass content > 2% cannot be accurately detected. To sum up, the accuracy and precision of the detection method for titanium content in steel provided by the prior art are relatively poor. Contents of the invention [0003] In view of this, the object ...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N1/28G01N1/44G01N33/2028
CPCG01N21/31G01N21/78G01N1/28G01N1/44G01N33/2028
Inventor 杨道兴
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL