Analytical method of nitrogen content in scrap like steel

Abstract

The invention relates to an analytical method of nitrogen content in scrap like steel. The analytical method comprises the following steps: placing a scrap like steel test sample into a beaker, adding acetone, cleaning through an ultrasonic cleaner, and removing pollutants in the test sample for standby; placing a graphite crucible into a heating furnace of an oxygen-nitrogen-hydrogen analyzer for heating and degassing; weighing the test sample after cleaning, and adding the test sample into the graphite crucible after degassing; placing the graphite crucible in which the test sample is placed back into the heating furnace for melting the test sample and releasing mixed gas of carbon monoxide, hydrogen and nitrogen; enabling the mixed gas containing the carbon monoxide, the hydrogen and the nitrogen to enter into a pipeline of the oxygen-nitrogen-hydrogen analyzer and pass through heated copper oxide so as to transform the carbon monoxide in the mixed gas to carbon dioxide and transform the hydrogen into water; absorbing the carbon dioxide and the water, and introducing the remaining nitrogen and helium in the mixed gas into a thermal conductivity cell; enabling the nitrogen and the helium to pass through the thermal conductivity cell to get a curve diagram of changes in thermal conductivity; performing curve calibration on a standard sample according to the steps and then figuring out the nitrogen content in the test sample; and further solving the analysis problem of the nitrogen content in the non-cylindrical steel test sample through a gas analyzer.

Description

technical field [0001] The invention relates to an analysis method for iron and steel content, in particular to an analysis method for nitrogen content in chipped iron and steel. Background technique [0002] Nitrogen in iron and steel mainly comes from air or manganese nitride, chromium nitride and other ferroalloy raw materials added artificially. It exists in the form of nitrides in steel, and some of them form solid solutions. Only a small part is adsorbed on the metal surface in the form of nitrogen molecules. or in the void. [0003] Nitrogen has a significant impact on the performance and quality of steel. Excessive nitrogen will reduce the toughness and magnetic permeability of steel; appropriate amount of nitrogen in steel can promote grain refinement and improve the hardness and strength of steel. [0004] The chemical analysis methods of nitrogen in iron and steel mainly include steam distillation-acid-base titration, steam distillation absorption photometry, etc...

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the above-mentioned shortcoming that existing products exist, and provide a kind of analysis method of nitrogen content in chip-like iron and steel, it can carry out accurate analysis to the nitrogen content in chip-like steel sample, thereby solves the problem of non-cylindrical steel test. The problem of using a gas analyzer for nitrogen content analysis in samples

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