Overview
EN ISO 10280:2025 - Steel and iron - Determination of titanium content - Diantipyrylmethane spectrophotometric method - is a CEN-endorsed ISO standard that specifies a validated spectrophotometric procedure to quantify titanium in steel and iron. Published in 2025 and superseding EN ISO 10280:1995, the method covers titanium contents from 0.002 % to 0.80 % (mass fraction) and is intended for routine chemical analysis in metallurgical testing and quality control.
Key Topics and Requirements
- Analytical principle: dissolution of the test portion in hydrochloric, nitric and sulphuric acids; fusion of any insoluble residue with potassium hydrogen sulfate (KHSO4); formation of a yellow titanium complex with 4,4'-diantipyrylmethane; spectrophotometric measurement at about 385 nm.
- Scope of applicability: titanium concentration range 0.002–0.80 % (mass fraction) in steel and iron.
- Reagents and standards: specifies use of analytical-grade reagents including diantipyrylmethane reagent, titanium standard solutions (1 g/L and 50 mg/L), acids (HCl, HNO3, H2SO4, HF), and grade 2 water per ISO 3696.
- Apparatus and glassware: class A volumetric glassware per ISO 648 / ISO 1042 and ordinary laboratory apparatus; fusion performed using platinum or platinum–gold crucibles as required.
- Procedure elements: sampling/preparation, dissolution, treatment of residues, colour development, blank determination, calibration curve preparation, and spectrophotometric measurement.
- Quality considerations: mandates reagent blanks, calibration with titanium standards, and reports precision data (precision re-evaluated for the 2025 edition). The document also notes possible patent considerations affecting implementation.
Applications
- Steel and iron producers: process control and verification of alloying titanium levels during production of stainless steels, high-strength alloys, cast irons.
- Independent testing laboratories: routine compositional analysis for certification, inspection, and contract compliance.
- Quality assurance / metallurgy teams: failure analysis, incoming material inspection, and verification of heat- or melt-level titanium specifications.
- Regulatory and procurement: provides an accepted method for contractual testing where titanium content must be demonstrated to buyers or authorities.
Related Standards
- ISO 14284 - Sampling and preparation of samples for chemical composition determination (referenced for sample prep).
- ISO 3696 - Water for analytical laboratory use.
- ISO 648 / ISO 1042 - Laboratory glassware (pipettes and volumetric flasks).
- Note: EN ISO 10280:2025 was prepared by ISO/TC 17 in collaboration with CEN/TC 459/SC 2 and must be adopted as a national standard by CEN members.
Keywords: EN ISO 10280:2025, titanium determination, diantipyrylmethane spectrophotometric method, steel and iron analysis, spectrophotometry, metallurgical testing, quality control.