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Method for measuring tungsten content in steel

A determination method and technology of tungsten content, applied in the field of chemical analysis, can solve the problem of non-linearity of molybdenum interference

Active Publication Date: 2018-02-06
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the interference of molybdenum in the existing sulfate photometry for measuring tungsten is not linear

Method used

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  • Method for measuring tungsten content in steel
  • Method for measuring tungsten content in steel
  • Method for measuring tungsten content in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Detect the steel with sample number YSBC11404-99Cr12W:

[0089] 1) Sampling and preparation: Take samples and prepare according to GB / T 20066 or appropriate national standards.

[0090] 2) Sample weight: Weigh the sample according to Table 1 (accurate to 0.0001g).

[0091] 3) Sample dissolution:

[0092] Make a reagent blank along with the sample.

[0093] Put the sample into a 300mL ordinary glass or quartz conical flask, add an appropriate amount of hydrochloric acid, nitric acid and mixed acid in appropriate proportions and heat at low temperature until the sample is completely dissolved. Add 25.0 ml of sulfuric acid and phosphoric acid mixed acid {when processing the sample in an ordinary glass Erlenmeyer flask, add (1+2) sulfuric acid mixed acid [sulfuric acid (ρ1.84g / ml) and phosphoric acid (ρ1.70g / ml) by volume 1 : 2 ratio mixing]; when processing the sample in the quartz conical flask, add (1+5) sulfur-phosphorus mixed acid [sulfuric acid (ρ1.84g / ml) and phos...

Embodiment 2

[0112] Referring to Example 1, the steel with the sample number BH1016-1Cr11Ni2W2MoV was tested, and the steel sample was tested twice, and the calculated tungsten contents were: 1.791wt% and 1.771wt%.

Embodiment 3

[0114] Referring to Example 1, the steel with the sample number YSBC11203-99 4Cr3SiMnMoV was tested, and the steel sample was tested twice, and the calculated tungsten contents were: 0.945wt% and 0.944wt%.

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Abstract

The invention belongs to the field of chemical analysis and particularly relates to a method for measuring tungsten content in steel. The method comprises the following steps: (a) mixing and heating the mixed acid of hydrochloric acid and nitric acid and a weighed steel sample, thereby dissolving the steel sample; (b) mixing with sulfur phosphor mixed acid and then heating till the sulfur phosphoric acid smoke appears in a mixed system, adding perchloric acid and then heating till pure perchloric acid smoke appears in the mixed system and separating the bottom of the appearing perchloric acidsmoke from the liquid level of the mixed system; (c) mixing with a dilute phosphoric acid solution, and then mixing with an ammonium ferrous sulfate solution, cooling to room temperature and then using a diluted phosphate solution for diluting and keeping constant volume, thereby acquiring to-be-developed mother liquor; and (d) taking some to-be-developed mother liquor, mixing with the thiocyanatesolution, stannous chloride solution, dilute sulfuric acid and a titanium trichloride solution, and then achieving the constant volume by using the stannous chloride solution, and developing to acquire the developing liquor; measuring the absorbency of the developing liquor; and calculating according to the measured absorbency value, thereby acquiring the tungsten content in the steel sample. Themeasuring method provided by the invention is high in accuracy, repeatability and reproducibility.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a method for measuring tungsten content in steel. Background technique [0002] Tungsten is silvery white and gray or black in powder form, and has the highest melting point among metals. As one of the alloying elements in steel, it is mainly used in the manufacture of special steel grades and hard alloys, permanent magnets, and black wire for electric lamps in steel production. It can increase the tempering stability, red hardness, and thermal strength of steel. And the formation of special carbides to increase wear resistance. The determination methods of tungsten content in steel introduced in the national standard are gravimetric method and tetraphenylarsenic chloride-thiocyanate-chloroform extraction spectrophotometric method. The above methods are relatively cumbersome and time-consuming. [0003] In order to simplify the operation steps, researchers have applied thiocyan...

Claims

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Application Information

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