Analytical method of nitrogen content in scrap like steel

An analysis method, a technology of nitrogen content, applied in the direction of material thermal conductivity, etc., to achieve the effect of solving the analysis of nitrogen content

Inactive Publication Date: 2012-07-04
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 c

Method used

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  • Analytical method of nitrogen content in scrap like steel
  • Analytical method of nitrogen content in scrap like steel
  • Analytical method of nitrogen content in scrap like steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] 1. Reagents and equipment

[0035] Acetone (analytical pure)

[0036] Ultrasonic cleaner (model KH3200)

[0037] High purity helium (carrier gas)

[0038] Ordinary nitrogen (power gas)

[0039] TCH600 Oxygen, Nitrogen and Hydrogen Analyzer (product of Leco, USA)

[0040] Graphite crucible (special crucible for oxygen, nitrogen and hydrogen analyzer, Leco 776-247)

[0041] Heating furnace (electrode pulse furnace, part of TCH600 oxygen, nitrogen and hydrogen analyzer)

[0042] Gas analyzer (referring to TCH600 oxygen, nitrogen and hydrogen analyzer)

[0043] 2. Working parameters

[0044] Power gas pressure: 40psi;

[0045] Carrier gas pressure: 20psi;

[0046] Degassing time: 35 seconds;

[0047] Degassing power: 5300W;

[0048] Cleaning time before analysis: 80 seconds;

[0049] Analysis power: 4800W;

[0050] Analysis time: 55 seconds.

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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...

Claims

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Application Information

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IPC IPC(8): G01N25/18
Inventor 刘志民王志成李艳杰
Owner TIANJIN HEAVY EQUIP ENG RES
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