Method for determining vanadium in vanadium nitrogen alloy

A measurement method, the technology of vanadium-nitrogen alloy, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve inaccurate results, unspecific acidity control values, and additional Low volume and other issues, to achieve the effect of simple operation

Inactive Publication Date: 2008-09-03
KUNMING IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the existing method are that the conditional test is too complicated, the acidity control range of sulfuric acid is too wide, the acidity control value is not specific, and the supplementary amount of reducing agent sodium arsenite and sodium nitrite is too small, so that the reduction of trivalent manganese is not complete, resulting in inaccurate result

Method used

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  • Method for determining vanadium in vanadium nitrogen alloy
  • Method for determining vanadium in vanadium nitrogen alloy
  • Method for determining vanadium in vanadium nitrogen alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Take vanadium-iron alloy standard sample (numbering is 69-44) 0.2000g in the Erlenmeyer flask of 500ml, add H 2 SO 4 (1+4) 50ml, put it on the electric furnace at low temperature and heat to dissolve, after large bubbles appear, add 2-3ml of nitric acid to oxidize, add H 3 PO 4 (Concentrated) 5ml continues to heat on the electric stove until sulfuric acid fumes are emitted for 2-3 minutes, remove it and cool slightly, add 50ml of water, and cool to room temperature. join (NH 4 ) 2 Fe(SO 4 ) 2 Standard solution 2ml, shake well, let it stand for 2min, add KMnO dropwise 4 Solution until the test solution is stable red and does not fade. Stand for 2min, add urea solution 10ml, drop NaNO 2 solution until the red color disappears, and add 2 drops of NaAsO 2 After 5ml of the solution, add 2 drops of NaNO 2 Solution, put it aside for 2min, add 3 drops of CrV indicator, and immediately titrate with ferrous ammonium sulfate standard solution until the test solution chan...

Embodiment 2

[0059] Take vanadium iron alloy standard sample (numbering is 50-A-2) 0.2000g in the Erlenmeyer flask of 500ml, add H 2 SO 4 (1+4) 50ml, put it on the electric furnace at low temperature and heat to dissolve, after large bubbles appear, add 2-3ml of nitric acid to oxidize, add H 3 PO 4 (Concentrated) 5ml continues to heat on the electric stove until sulfuric acid fumes are emitted for 2-3 minutes, remove it and cool slightly, add 50ml of water, and cool to room temperature. join (NH 4 ) 2 Fe(SO 4 ) 2 Standard solution 2ml, shake well, let it stand for 2min, add KMnO dropwise 4 Solution until the test solution is stable red and does not fade. Stand for 2min, add urea solution 10ml, drop NaNO 2 solution until the red color disappears, and add 2 drops of NaAsO 2 After 5ml of the solution, add 2 drops of NaNO 2 solution, let it stand for 2 minutes, add 3 drops of CrV indicator, and immediately titrate with ferrous ammonium sulfate standard solution until the test solutio...

Embodiment 3

[0061] Take vanadium-nitrogen alloy sample (numbering is 1#) 0.2000g in the Erlenmeyer flask of 500ml, add H 2 SO 4 (1+4) 50ml, put it on the electric furnace at low temperature and heat to dissolve, after large bubbles appear, add 2-3ml of nitric acid to oxidize, add H 3 PO 4 (Concentrated) 5ml continues to heat on the electric stove until sulfuric acid fumes are emitted for 2-3 minutes, remove it and cool slightly, add 50ml of water, and cool to room temperature. join (NH 4 ) 2 Fe(SO 4 ) 2 Standard solution 2ml, after shaking well, let stand for 2min, add KMnO dropwise 4 Solution until the test solution is stable red and does not fade. Stand for 2min, add urea solution 10ml, drop NaNO 2 solution until the red color disappears, and add 2 drops of NaAsO 2 After 5ml of the solution, add 2 drops of NaNO 2 solution, let it stand for 2 minutes, add 3 drops of CrV indicator, and immediately titrate with ferrous ammonium sulfate standard solution until the test solution ch...

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Abstract

The invention relates to a method for testing vanadium in vanadium-nitrogen alloy. The method has the following steps: crushing and sieving the test sample through 200 mesh, fetching the sample from the erlenmeyer flask, adding H2SO4(1+4) and dissolving it by heating, dropping nitric acid to oxidizing it, adding concentrated H3PO4 and heating to the state that the sulfuric acid emits smoke, and then cooling to room temperature; adding (NH4)2Fe(SO4)2 standard solution, dropping KMnO4 solution till the test solution is red steadily and the color does not fade; adding urea solution, dropping NaNO2 solution till the red color fades, adding NaAsO2 solution, placing, dropping 2-3 drops of CrV indicator, immediately titrating with the ammonium ferrous sulphate standard solution till the color changes from cerise into light green, according to the volume of the consumed ammonium ferrous sulphate standard solution, calculating the content of the vanadium in the sample. The test result of the vanadium in vanadium-nitrogen alloy is accurate and the method is convenient.

Description

technical field [0001] The invention relates to a quantitative analysis and detection technology for vanadium in alloys, in particular to a quantitative analysis and detection method for vanadium in vanadium-nitrogen alloys, belonging to the field of chemical analysis and detection. technical background [0002] The determination method of vanadium in vanadium-nitrogen alloy is not introduced in all the materials of the current national standards, and there is no record in the international standards. Vanadium-nitrogen alloy is an ideal composite additive to replace vanadium-iron alloy for the production of vanadium micro-alloyed steel. The addition of vanadium nitride to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 董丙成许荣昌李西忠王成林闫志华王秀花
Owner KUNMING IRON & STEEL
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