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Method for accurately and quickly detecting manganese content in nitridation reinforcer

A technology of nitriding enhancement and detection method, which is applied in the preparation of test samples, analysis by chemical reaction of materials, and material analysis by observing the impact on chemical indicators, etc. problems such as the increase in the cost of steel grades, to achieve the effect of being conducive to large-scale promotion and application, short detection cycle, and high promotion value

Inactive Publication Date: 2015-04-08
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In iron and steel smelting production, at present, nitriding enhancers are mainly used as nitrogen-increasing agents for high-strength steels in China. Due to the rise in the price of ferroniobium, the cost of high-efficiency steels is also increasing, which affects the economic benefits of enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058]——Detection of manganese content in nitriding enhancer

[0059] (1) Preparation and calibration of experimental reagents

[0060] Weigh 15.68g of ferrous ammonium sulfate, add 200ml of sulfuric acid solution mixed with 98% sulfuric acid and distilled water at a volume ratio of 1:1, and after the ferrous ammonium sulfate is completely dissolved, transfer it to a 1000ml volumetric flask and distill it to volume to the mark, and mix well to obtain a standard solution of ammonium ferrous sulfate.

[0061] Weigh 1.9600g of potassium dichromate which has been pre-dried at 140~150°C for 2h and cooled to room temperature in a desiccator, dissolve it with distilled water, transfer it to a 1000ml volumetric flask, and dilute to the mark with distilled water, mix well to obtain a concentration of 0.04mol / L potassium dichromate standard solution.

[0062] Weigh 0.2g of N-phenylated anthranilic acid and dissolve it in 100ml of 2g / L sodium carbonate solution at 85°C to obtain a solu...

Embodiment 2

[0085] ——Detection of manganese content in nitriding enhancer

[0086] The preparation and calibration of experimental reagents are the same as in Example 1.

[0087] The detection of manganese content is the same as in Example 1.

[0088] The calculation of manganese content in the described nitriding enhancer sample is carried out as follows:

[0089] Mn(%)=

[0090] =

[0091] =32.27%

[0092] In the formula:

[0093] C—concentration of ferrous ammonium sulfate standard solution, 0.03989mol / L;

[0094] M - mass of sample, 0.2000g;

[0095] V 0 - the volume of ammonium ferrous sulfate standard solution consumed by titrating the blank test solution, 0.00ml;

[0096] V——The volume of ferrous ammonium sulfate standard solution consumed by titration test solution b, 29.45ml;

[0097] 54.938——Molar mass of manganese, g / mol.

Embodiment 3

[0099] ——Detection of manganese content in nitriding enhancer

[0100] The preparation and calibration of experimental reagents are the same as in Example 1.

[0101] The detection of manganese content is the same as in Example 1.

[0102] The calculation of manganese content in the described nitriding enhancer sample is carried out as follows:

[0103] Mn(%)=

[0104] =

[0105] =38.57%

[0106] In the formula:

[0107] C—concentration of ferrous ammonium sulfate standard solution, 0.03989mol / L;

[0108] M - mass of sample, 0.2000g;

[0109] V 0 - the volume of ammonium ferrous sulfate standard solution consumed by titrating the blank test solution, 0.00ml;

[0110] V——The volume of ferrous ammonium sulfate standard solution consumed by titration test solution b, 35.20ml;

[0111] 54.938——Molar mass of manganese, g / mol.

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Abstract

The invention discloses a method for accurately and quickly detecting manganese content in a nitridation reinforcer. The method comprises the following steps: pulverizing a test sample, weighing 0.2000g of test sample, evenly mixing with 10ml of 1.42 g / ml nitric acid, 12.0ml of 1.70 g / ml phosphoric acid and 5 drops of 1.15 g / ml hydrofluoric acid, heating to 80-100 DEG C until the test sample is completely dissolved, cooling for 2-3 minutes, adding 2.0ml of 1.67 g / ml perchloric acid into the obtained test solution, heating until small bubbles on the liquid level disappear, cooling to 70-80 DEG C, adding 50ml of water until the reaction salts are sufficiently dissolved, cooling to room temperature, titrating the test solution with a 0.03980-0.0400 mol / L ammonium ferrous sulfate standard solution until the solution turns pink, adding 5 drops of 2 g / L N-phenyl anthranilic acid solution, continuing titrating until the solution becomes brilliant green to reach the end point, and recording the volume of the consumed ammonium ferrous sulfate standard solution. The manganese content is calculated according to the following formula. The method can implement quick detection on the manganese content in the nitridation reinforcer, and has the advantages of accurate, stable and reliable detection result and high popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of testing and analysis of metallurgical materials, and in particular relates to an accurate and rapid detection method for manganese content in a nitriding enhancer. Background technique [0002] In iron and steel smelting production, at present, nitriding enhancers are mainly used as nitrogen-increasing agents for high-strength steels in China. Due to the rise in the price of ferroniobium, the cost of high-efficiency steels is also increasing, which affects the economic benefits of enterprises. In order to reduce the production cost of high-efficiency steel, an appropriate amount of nitriding enhancer is often added in the smelting and production of steel to increase the total nitrogen in the steel and form more Nb (CN) under the same conditions, thereby enhancing the fineness of Nb. The crystallization and precipitation strengthening effect increase the recovery rate of niobium in smelting. At the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N1/28G01N1/38
Inventor 郑玲陶俊刘鸿兵
Owner WUKUN STEEL
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