GB/T 24583.6-2019Vanadium-nitrogen—Determination of sulfur content—Infrared absorption method (English PDF)

Foreword

The analysis method of GB/T 24583 vanadium nitrogen alloy is divided into 8 parts.

--- GB/T 24583.1 Determination of vanadium content of vanadium-nitrogen alloys - Ammonium sulphate titration method;

--- GB/T 24583.2 Determination of nitrogen content of vanadium-nitrogen alloys - Inert gas fusion heat conduction method;

--- GB/T 24583.3 Determination of nitrogen content of vanadium-nitrogen alloys - Distillation - Neutralometric titration;

--- GB/T 24583.4 Determination of carbon content of vanadium-nitrogen alloys - infrared absorption method;

--- GB/T 24583.5 Determination of phosphorus content of vanadium-nitrogen alloys - bismuth phosphorus molybdenum blue spectrophotometric method;

--- GB/T 24583.6 Determination of sulfur content of vanadium-nitrogen alloys by infrared absorption method;

--- GB/T 24583.7 Determination of oxygen content of vanadium-nitrogen alloys - infrared absorption method;

--- GB/T 24583.8 Determination of silicon, manganese, phosphorus and aluminium content of vanadium-nitrogen alloys by inductively coupled plasma atomic emission spectrometry.

This part is the sixth part of GB/T 24583.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 24583.6-2009 "Determination of sulfur content of vanadium-nitrogen alloys by infrared absorption method". This part and Compared with GB/T 24583.6-2009, the main technical changes are as follows.

---Modified "normative references" (see Chapter 2, Chapter 2 of the 2009 edition);

---Modified description of the principle (see Chapter 3, Chapter 3 of the 2009 edition);

--- Revised the method of preparation and preparation of the sample (see Chapter 6, Chapter 6 of the 2009 edition);

--- Revised "Representation of Analysis Results" (see Chapter 8, Chapter 8 of the 2009 edition);

--- Replace the allowable difference with the reproducibility limit r and the reproducibility limit R of the inter-laboratory precision test data statistics (see Chapter 9, Chapter 9 of the 2009 edition).

1 Scope

This part of GB/T 24583 specifies the determination of sulfur in vanadium-nitrogen alloys by infrared absorption method.

This section applies to the determination of sulfur content in vanadium-nitrogen alloys. Measuring range (mass fraction). 0.010%~0.150%.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 6379.1 Accuracy of measurement methods and results (accuracy and precision) Part 1: General and definition

GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2: Determination of standard method of measurement Basic method of sex and reproducibility

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

GB/T 20567 vanadium nitrogen alloy

3 Principle

The sample is heated and burned in the oxygen flow of the high-frequency induction furnace, and the sulfur-generated sulfur dioxide is carried by the oxygen to the measuring chamber of the infrared analyzer.

Sulfur oxide absorbs infrared energy of a specific wavelength, and its absorption energy is proportional to its concentration, and the sulfur content can be determined according to changes in the energy received by the detector.

4 Reagents and materials

4.1 Magnesium perchlorate, anhydrous, granular.

4.2 Alkali asbestos, granular.

4.3 Glass wool.

4.4 Tungsten grain, sulfur content is not more than 0.0005%, particle size is 0.8mm~1.4mm.

4.5 Pure iron, the sulfur content is not more than 0.002%.

4.6 Tin particles, the sulfur content is not more than 0.002%.

4.7 Oxygen, purity not less than 99.95%.

4.8 Power gas source, nitrogen or compressed air, with impurities (water and oil) content less than 0.5%.

4.9 ceramic crucible, phi23mm × 23mm or phi25mm × 25mm, burning in a high temperature furnace not lower than 1000 ° C for 1 h or The oxygen is burned until the blank value is the lowest.