ISO TR 9769:2018 pdf download.Steel and iron – Review of available methods of analysis.
ISO TR 9769 gives guidelines for the determination of the chemical composition of steel and iron by reference to published International Standards, including their range of application and principles of the methods.
Graphical representation of the precision data precision data for the methods is given in Annex A. The list of International Standards is summarized in Annex B.
2 Normative references
There are no normative references in ISO TR 9769.
4 International Standards for determining the chemical composition of steel and
iron, their range of application and principles of the methods
4.1 Mono-elemental methods
4.1.1 Aluminium, Al
Document: ISO 9658:1990, Steel — Determination of aluminium content — Flame atomic absorption spectrometric method.
Range of application:
— determination of acid-soluble and/or total aluminium contents between a mass fraction of 0,005 % and a mass fraction of 020 % in non-alloyed steel.
Principle of the method:
a) dissolution ofa test portion in dilute hydrochloric and nitric acids;
b) fusion of the acid-insoluble material with a mixture of orthoboric acid and potassium carbonate;
Document: ISO 17058:2004, Steel and iron — Determination of arsenic content — Spectrophotometric method.
Range of application:
— determination of the arsenic content between 0,000 5 % (mass fraction) and 0,10 % (mass fraction) in steel and iron.
Principle of the method:
a) dissolution of a test portion in a hydrochloric acid and nitric acid mixture;
b) prolonged heating with sulfuric acid until white fumes are given off;
c) reduction of arsenic in the presence of hydrazine sulfate and potassium bromide, then separation by distillation as the trivalent chloride, absorbed in the nitric acid solution, in which the As(III) is oxidized back to the pentavalent state As(V);
d) formation of the molybdenum blue complex between ammonium molybdate and arsenic, which is reduced by hydrazine sulfate;
4.1.5.1 Document: Iso 10697-1:1992, Steel — Determination of calcium content by flame atomic absorption spectrometry — Part 1: Determination of acid-soluble calcium content.
Range of application:
— determination of acid-soluble calcium content between a mass fraction of 0,000 5 % and a mass fraction of 0003 % in steel.
Principle of the method:
a) dissolution of a test portion in hydrochloric and nitric acids;
b) addition of potassium chloride/lanthanum nitrate solution as a spectrochemical buffer;
c) spraying of the solution into a dinitrogen monoxide-acetylene flame;
d) spectrometric measurement of the atomic absorption of the 422,7 nm spectral line emitted by a calcium hollow cathode lamp.
4.1.5.2 Document: ISO 10697-2:1994, Steel — Determination of calcium content by flame atomic absorption spectrometry — Part 2: Determination of total calcium content.
4.1.8.2 Document: ISO 11653:1997, Steel — Determination of high cobalt content — Potentiometric titration method after separation by ion exchange.
Range of application:
— determination of cobalt content between a mass fraction of 5,0% and a mass fraction of 17,0% in steel. Principle of the method:
a) dissolution of a test portion in a mixture of nitric and hydrochloric acids;
b) separation of cobalt from interfering elements by selective elusion from an anion exchange column using hydrochloric acid;
c) oxidation with perchioric acid; removal of dissolved chlorine and oxygen with a stream of nitrogen;
d) addition of the test solution to a solution containing ammonium citrate, ammonium hydroxide and an excess of potassium hexacyanoferrate(l1l) standard solution and titration of the excess with a standard cobalt solution using potentiometric end-point detection.ISO-TR-9769-2018