ISO 15355-1999 PDF

Full title and description

St ISO 15355-1999 — Steel and iron — Determination of chromium content — Indirect titration method. This International Standard specifies a potentiometric (indirect) titration procedure for measuring chromium content in steel and iron samples.

Abstract

ISO 15355:1999 describes a potentiometric indirect titration method for the determination of chromium in steels and irons. The procedure covers chromium contents from 1 % (m/m) up to 35 % (m/m) and includes limits on interfering elements (notably vanadium) to ensure reliable results. The standard defines reagents, apparatus, sample preparation, titration conditions, calculation of results and reporting requirements for routine laboratory analysis.

General information

• Status: Published — confirmed on 25 July 2022 and recorded as "to be revised" on 20 December 2024 (a draft revision ISO/DIS 15355 is under development).
• Publication date: 16 December 1999.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.080.01 — Ferrous metals in general.
• Edition / version: Edition 1 (1999).
• Number of pages: 11.

Scope

Applies to the determination of chromium content in steels and irons by an indirect potentiometric titration technique. The method is intended for chromium concentrations between 1 % (m/m) and 35 % (m/m). To avoid interference in the titration, samples should meet vanadium-content limits: less than 1 % (m/m) for chromium contents higher than 10 % (m/m) and less than 0.2 % (m/m) for chromium contents lower than 10 % (m/m). The standard addresses laboratory procedures for sample dissolution, conditioning, titration and calculation of mass fraction.

Key topics and requirements

• Potentiometric indirect titration technique for chromium determination.
• Applicable concentration range: 1 % to 35 % (m/m) chromium.
• Sample dissolution and preparation procedures suitable for steels and irons.
• Reagents, titrants and conditioning solutions required for the method.
• Apparatus and potentiometric equipment specifications (electrodes, titrator, etc.).
• Calibration, standardization and end-point detection requirements.
• Interference control and acceptance limits (notably vanadium restrictions).
• Calculation of results, expression of chromium content and reporting format.
• Performance characteristics and laboratory quality-control practices (precision, accuracy, repeatability considerations).

Typical use and users

Used by metallurgical and chemical testing laboratories, quality-control departments in steel producers, independent materials testing agencies, certification and inspection bodies, and research laboratories performing routine or contract analyses of ferrous materials. Typical applications include incoming material inspection, production process control, specification verification and failure analysis where chromium content must be quantified.

Related standards

ISO 15355:1999 is maintained by ISO/TC 17/SC 1 (Methods of determination of chemical composition). A draft revision (ISO/DIS 15355) has been prepared to replace the 1999 edition. Alternative or complementary analytical methods for chromium in metals include instrumental techniques (for example, atomic absorption spectroscopy and ICP-OES/OES methods) and corresponding ISO, EN or national standards for those instrumental methods; national equivalents and related standards from ISO/TC 17 and other committees address sample preparation, reporting and other elemental determinations in ferrous materials.

Keywords

ISO 15355:1999, chromium determination, chromium content, steel analysis, iron analysis, potentiometric titration, indirect titration, vanadium interference, metallurgical testing, chemical analysis.

FAQ

Q: What is this standard?

A: ISO 15355:1999 is an International Standard that specifies a potentiometric indirect titration method for determining chromium content in steels and irons.

Q: What does it cover?

A: It covers laboratory procedures including sample preparation, reagents, apparatus, titration technique, calculations and reporting for chromium concentrations from 1 % to 35 % (m/m), and sets limits on vanadium to avoid analytical interference.

Q: Who typically uses it?

A: Metallurgical and chemical testing laboratories, steel producers' quality-control teams, inspection and certification bodies, and research laboratories analyzing chromium in ferrous materials.

Q: Is it current or superseded?

A: The 1999 edition was published on 16 December 1999 and was confirmed as current on 25 July 2022. The standard was recorded as "to be revised" on 20 December 2024, and a draft revision (ISO/DIS 15355) is under development to replace it.

Q: Is it part of a series?

A: It is part of the body of ISO standards maintained by ISO/TC 17/SC 1 covering methods for the chemical analysis of steels and irons. Related ISO methods and national/EN equivalents address other elements and instrumental techniques.

Q: What are the key keywords?

A: Chromium, chromium content, steel, iron, potentiometric titration, indirect titration, chemical analysis, vanadium interference, ISO 15355:1999.