GB/T 24583.4-2019Vanadium-nitrogen—Determination of carbon content—Infrared absorption method (English PDF)

Foreword

GB/T 24583, the analysis method of vanadium-nitrogen, consists of 8 parts:

- GB/T 24583.1 Vanadium-nitrogen - Determination of vanadium content - Ammonium ferrous sulfate titration method;

- GB/T 24583.2 Vanadium-nitrogen - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas;

- GB/T 24583.3 Vanadium-nitrogen - Determination of nitrogen content - Distillation-neutralization titration method;

- GB/T 24583.4 Vanadium-nitrogen - Determination of carbon content - Infrared absorption method;

- GB/T 24583.5 Vanadium-nitrogen - Determination of phosphorus content - Bismuth molybdenum blue spectrophotometric method;

- GB/T 24583.6 Vanadium-nitrogen - Determination of sulfur content - Infrared absorption method;

- GB/T 24583.7 Vanadium-nitrogen - Determination of oxygen content - Infrared absorption method;

- GB/T 24583.8 Vanadium-nitrogen - Determination of silicon, manganese, phosphorus, aluminum content - Inductively coupled plasma atomic emission spectrometric method.

This Part is Part 4 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 24583.4-2009 "Vanadium-nitrogen alloy - Determination carbon of content - The infrared absorption method". Compared with GB/T 24583.4-2009, the main technical changes are as follows:

- MODIFY the "Normative references" (see Clause 2 of this Part, Clause 2 of 2009 edition);

- MODIFY the description of the principle (see Clause 3 of this Part, Clause 3 of 2009 edition);

- MODIFY the purity of oxygen (see 4.7 of this Part, 4.7 of 2009 edition);

- MODIFY the taking and preparation method of samples (see Clause 6 of this Part, Clause 6 of 2009 edition);

Vanadium-nitrogen - Determination of carbon content - Infrared absorption method CAUTION -- The personnel using this Part shall have hands-on experience in formal laboratory work. This Part does not address all possible safety issues. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set by the relevant national regulations.

1 Scope

This Part of GB/T 24583 specifies the infrared absorption method for the determination of carbon content in vanadium-nitrogen.

This Part applies to the determination of carbon content in vanadium-nitrogen.

The determination range (mass fraction): 1.00 % ~ 15.00 %.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 6379.1 Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions

GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method

GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 20567 Vanadium-nitrogen compensation of the blank value when determining the sample.

8 Representation of analysis results

If the absolute value of the difference between two independent analysis results of the same sample is not greater than the repeatability limit r, the arithmetic mean is taken as the analysis result. If the absolute value of the difference between the two independent analysis results is greater than the repeatability limit r, then the number of measurements is increased according to the provisions of Annex A and the analysis result is determined.

The analysis result is rounded off to two decimal places according to GB/T 8170.