This document specifies a spectrophotometric method for the determination of nitrogen in steel. The method is applicable to the determination of nitrogen mass fraction between 0,000 6 % and 0,050 % in low alloy steels and between 0,010 % and 0,050 % in high alloy steels. The method does not apply to samples containing silicon nitrides or having silicon contents higher than 0,6 %.
Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).
Sisällysluettelo
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Sampling
8 Procedure
8.1 Test portion
8.2 Blank test
8.3 Determination
8.4 Establishment of the calibration curve
9 Expression of results
9.1 Method of calculation
9.2 Precision
10 Test report
Annex A Examples of distillation apparatus (informative)
Annex B Additional information on the international interlaboratory test (informative)
Annex C Graphical representation of precision data (informative)
ISO 1042:1998 Laboratory glassware -- One-mark volumetric flasks
ISO 14284:1996 Steel and iron -- Sampling and preparation of samples for the determination of chemical composition
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 1042:1998 Laboratory glassware -- One-mark volumetric flasks
ISO 14284:1996 Steel and iron -- Sampling and preparation of samples for the determination of chemical composition
ISO 3696:1987 Water for analytical laboratory use -- Specification and test methods
ISO 648:2008 Laboratory glassware -- Single-volume pipettes