ISO 671-1982 PDF

Full title and description

Steel and cast iron — Determination of sulphur content — Combustion titrimetric method. This International Standard specifies a titrimetric procedure for determining the sulphur content of steels and cast irons by combustion of a measured test portion in an oxygen stream, followed by absorption and volumetric titration.

Abstract

ISO 671:1982 describes the principle, required reagents and apparatus, sampling and preparation of test portions, the combustion and absorption procedure, calculation and expression of results, and reporting requirements for the titrimetric determination of sulphur in steel and cast iron. The method converts sulphur to sulphur dioxide by combustion in oxygen and quantifies it by titration of the absorbing solution.

General information

• Status: Published (International Standard; lifecycle shown as confirmed).
• Publication date: November 1982 (Edition 1, 1982).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.080.01 — Ferrous metals in general; Technical committee: ISO/TC 17/SC 1.
• Edition / version: Edition 1 (1982).
• Number of pages: 5 pages (concise method standard).

Key bibliographic and lifecycle details above are taken from the ISO record and corroborating standards catalogues.

Scope

Specifies a combustion titrimetric method for the determination of total sulphur in steel and cast iron test portions. The standard covers principle, required purity of oxygen, reagents and fluxes, apparatus (combustion furnace, absorption vessels), sampling and sample preparation, procedural steps for combustion and absorption, titration and calculation of sulphur as percentage by mass, and requirements for reporting results and checking blanks and apparatus tightness. It is intended for routine laboratory analysis and quality control of ferrous materials.

Key topics and requirements

• Principle: combustion of a weighed test portion in oxygen to convert sulphur to SO2, absorption of SO2 and volumetric titration to determine sulphur content.
• Reagents: specification of absorbing solution and titrant; requirement for oxygen of high purity (minimum ~99%).
• Apparatus: high-temperature combustion furnace/tube, absorption vessels, gas-drying/clean-up media and titration equipment.
• Sampling and sample preparation: references to appropriate sampling/preparation practice for steels and cast irons (sample form, mass depending on expected sulphur level).
• Procedure and calculations: stepwise combustion and absorption instructions, titration endpoint handling, formula to convert titrant volume to sulphur percentage.
• Quality control: blank determinations, checks for leak-tightness, use of reference materials and low-sulphur fusion aids.

Typical use and users

Routine and contract testing laboratories, metallurgical quality-control departments at steelworks and foundries, materials research laboratories, inspection and certification bodies, and standards bodies. The method is used where accurate determination of total sulphur in ferrous products is required for process control, acceptance testing and compliance with material specifications.

Related standards

This edition cancels and replaces the earlier ISO Recommendation R 671 (1968) and cross-references standards for sampling and preparation of steel and cast-iron test pieces. It is related to other analytical method standards for sulfur and non-metallic constituents in ferrous metals and to national implementations of the method.

Keywords

ISO 671, sulphur determination, steel analysis, cast iron analysis, combustion titrimetry, volumetric analysis, ferrous metals, quality control, laboratory method.

FAQ

Q: What is this standard?

A: ISO 671:1982 is the International Standard that specifies a combustion titrimetric method to determine the total sulphur content in steel and cast iron test portions.

Q: What does it cover?

A: It covers the principle of the method, required reagents and apparatus, sampling and sample preparation, the combustion and absorption procedure, titration and calculation of results, and reporting and quality-control checks.

Q: Who typically uses it?

A: Metallurgical laboratories, foundries and steelworks quality-control teams, independent testing laboratories, and certification/inspection bodies concerned with compositional analysis of ferrous materials.

Q: Is it current or superseded?

A: The 1982 edition is published by ISO and listed as the International Standard (Edition 1, 1982). Users should check national catalogues or ISO records for any later revisions or replacements before relying on it for regulatory or contractual purposes.

Q: Is it part of a series?

A: It is part of ISO’s body of standards dealing with analytical methods for ferrous metals and cross-references related sampling/preparation standards; it replaced an earlier ISO Recommendation (R 671:1968).

Q: What are the key keywords?

A: Sulphur, steel, cast iron, combustion, titrimetry, volumetric analysis, ferrous metals, ISO 671.