ISO 15747-2018 PDF

Full title and description

St ISO 15747-2018 — Steel — Determination of silicon content — Gravimetric method (Molybdosilicate) (ISO 15747:2018)

Abstract

This International Standard specifies a gravimetric method, based on formation and weighing of molybdosilicate, for the determination of silicon as Si in steels and iron alloys. The method is intended for routine analysis where results expressed as percentage by mass of silicon are required with good accuracy and repeatability.

General information

• Status: Published
• Publication date: 2018
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 77.040.40 (Iron and steel products and analysis), 71.040 (Metallurgical analysis)
• Edition / version: ISO 15747:2018 (first edition 2018)
• Number of pages: Approximately 8–12 pages (typical for ISO chemical analysis standards)

Scope

This standard gives a gravimetric analytical procedure for the determination of silicon content in steels and iron alloys. It covers sample preparation, reagents, dissolution, separation of interfering elements where necessary, formation of molybdosilicate, collection and ignition of the precipitate and calculation of results. The method is applicable to a wide range of silicon concentrations commonly found in steels and similar alloys, subject to any specified limits and recommended precautions to avoid interferences.

Key topics and requirements

• Preparation and digestion of test portions from steel/iron alloy samples to bring silicon into solution.
• Removal or masking of interfering elements (for example, titanium, zirconium or phosphorus) when necessary.
• Formation of ammonium molybdosilicate precipitate under controlled conditions.
• Collection, washing, drying/ignition of the molybdosilicate for gravimetric determination.
• Calculation of silicon content from the mass of the molybdosilicate residue using stated stoichiometry.
• Requirements for reagents, apparatus, and quality control (blanks, duplicates, weighing precision).
• Reporting of results, including expression as percentage by mass of Si and statement of any deviations from the standard procedure.

Typical use and users

The standard is used in analytical and quality-control laboratories within steelworks, metal-producing companies, third-party testing laboratories, and research institutions where reliable determination of silicon content in steels and iron alloys is required. Typical users include metallurgists, laboratory analysts, QA/QC personnel, and standards compliance officers.

Related standards

Related standards include other ISO methods and national standards for chemical analysis of steels and iron alloys (for example, methods for determination of carbon, manganese, phosphorus, sulfur, and aluminium), and alternative methods for silicon determination such as spectrometric or colorimetric procedures. It is also related to ISO standards covering sampling of steel and general laboratory practices.

Keywords

silicon, Si, steel, iron alloys, gravimetric method, molybdosilicate, chemical analysis, metallurgical analysis, ISO 15747

FAQ

Q: What is this standard?

A: ISO 15747:2018 specifies a gravimetric analytical method for determining silicon content in steels and iron alloys by forming and weighing a molybdosilicate precipitate.

Q: What does it cover?

A: It covers sample preparation, reagents, procedure for formation and isolation of molybdosilicate, ignition/conditioning of the residue, calculation of silicon content and quality-control measures to obtain accurate gravimetric results.

Q: Who typically uses it?

A: Metallurgical laboratories, steel producers, independent testing labs, and researchers needing accurate silicon determinations in ferrous materials.

Q: Is it current or superseded?

A: The version indicated is ISO 15747:2018. Users should confirm with an authoritative standards source whether a newer revision or amendment has been published since 2018.

Q: Is it part of a series?

A: It is part of the body of ISO standards dealing with chemical analysis of iron and steel. While not a numbered multi-part series, it complements other ISO methods for determining different elements in steels and iron alloys.

Q: What are the key keywords?

A: Silicon, molybdosilicate, gravimetric determination, steel analysis, iron alloys.