ISO 7524:2020
Ferronickels — Determination of carbon content — Infrared absorption method after induction furnace combustion
This document specifies an infrared absorption method after combustion in an induction furnace for the determination of the carbon content in ferronickels in the range of 0,004 % to 2,5 %.
The method is applicable to normal production operations. It uses commercially available equipment, which is calibrated using steel and/or ferronickel certified reference materials (CRMs).
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and sample preparation
8 Procedure
8.1 Preparing and stabilizing the instrument
8.2 Blank test and zero adjustment
8.2.1 Carbon contents ≤ 0,1 %
8.2.2 Carbon contents > 0,1 %
8.3 Calibration
8.4 Determination
9 Expression of results
9.1 Calculation
9.2 Precision
10 Test report
Annex A (informative) Features of commercial high frequency induction furnaces and infrared carbon analysers
Annex B (informative) Composition of the samples used for the validation precision test
Annex C (informative) Graphical representation of the precision data
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling and sample preparation
8 Procedure
8.1 Preparing and stabilizing the instrument
8.2 Blank test and zero adjustment
8.2.1 Carbon contents ≤ 0,1 %
8.2.2 Carbon contents > 0,1 %
8.3 Calibration
8.4 Determination
9 Expression of results
9.1 Calculation
9.2 Precision
10 Test report
Annex A (informative) Features of commercial high frequency induction furnaces and infrared carbon analysers
Annex B (informative) Composition of the samples used for the validation precision test
Annex C (informative) Graphical representation of the precision data
Bibliography