ISO 18632:2018
Alloyed steels — Determination of manganese — Potentiometric or visual titration method
This document specifies a potentiometric or visual titration method for the determination of manganese content in alloyed steels.
The method is applicable to manganese mass fractions between 2 % and 25 %. Vanadium and cerium interfere with the determination. If the mass fraction of cerium in the sample is less than 0,01 %, or the mass fraction of vanadium in the sample is less than 0,005 %, the interference is negligible, otherwise theoretical corrections are necessary.
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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 Determination
8.2.1 Preparation of test solution
8.2.2 Titration
8.2.3 Theoretical correction of vanadium and cerium
9 Expression of results
9.1 Method of calculation
9.1.1 Visual titration
9.1.2 Potentiometric titration
9.2 Precision
10 Test report
Annex A (informative) Additional information on the international interlaboratory test
Annex B (informative) Graphical representation of precision data
Annex C (informative) Main redox reactions and correction of vanadium and cerium contents
Bibliography
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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 Determination
8.2.1 Preparation of test solution
8.2.2 Titration
8.2.3 Theoretical correction of vanadium and cerium
9 Expression of results
9.1 Method of calculation
9.1.1 Visual titration
9.1.2 Potentiometric titration
9.2 Precision
10 Test report
Annex A (informative) Additional information on the international interlaboratory test
Annex B (informative) Graphical representation of precision data
Annex C (informative) Main redox reactions and correction of vanadium and cerium contents
Bibliography