ISO 7692:2025 フェロチタン — チタン含有量の測定 — 滴定法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 132, Ferroalloys.

This second edition cancels and replaces the first edition (ISO 7692:1983), which has been technically revised.

The main changes are as follows:

• 5.5 (previously in 4.6), hydrofluoric acid has been replaced with fluoboric acid;
• 5.13 (previously in 4.17), the concentration of titanium standard solution has been changed;
• 5.13.1 (previously in 4.17.1), the amount of titanium(IV) dioxide has been reduced and the decomposition of titanium(IV) dioxide has been changed;
• 5.13.2 (previously in 4.17.2), potassium hexafluorotitanate has been replaced with a titanium sponge and the preparation has been changed;
• Clause 6 (previously in Clause 5), polytetrafluoroethylene (PTFE) beakers have been replaced with a conical flask;
• Clause 7 (previously in Clause 6), the mesh size of the sieve has been changed;
• the paragraph of the definition of test portion has been changed in 8.1 and the amount of test portion in 8.1 (previously 7.1) has been reduced from 1,0 g to 0,50 g;
• 8.2.1, (previously in 7.4.1), the method using titanium sponge has been removed;
• 8.3.1 (previously 7.5.1), the amount of acids has been reduced;
• 8.3.4 (previously 7.5.3.2), the amount of the aluminium has been reduced from 4,0 g to 3,0 g ± 0,2 g;
• Clause 9 (previously in Clause 8), the expression of results has been changed;
• Clause 10, the precision has been added;
• Clause 11 (previously in Clause 9), the test report has been changed;
• Annex A has been added;
• Annex B has been added;
• Annex C has been added.

1 Scope

This document specifies a titrimetric method for the determination of the titanium content of ferrotitanium.

The method is applicable to titanium contents of a mass fraction between 20,0 % and 80,0 % in ferrotitanium.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography