SIST EN 24935:1997 PDF

Overview

SIST EN 24935:1997 - "Steel and iron - Determination of sulphur content - Infrared absorption method after combustion in an induction furnace (ISO 4935:1989)" - is a European standard developed by the European Committee for Standardization (CEN). This standard specifies a reliable analytical procedure for determining sulphur content in steel and iron using infrared absorption after combustion in an induction furnace. The method is applicable for sulphur contents ranging from 0.002% to 0.10% by mass (m/m), ensuring accurate quality control and compliance for a wide range of metal materials.

Key Topics

• Scope and Applicability

  • Suitable for sulphur levels between 0.002% and 0.10% (m/m).
  • Applicable to various forms of steel and iron, including cast iron and alloys.

• Principle of Method

  • Test sample is combusted with an accelerator in a high-frequency induction furnace, under a stream of pure oxygen.
  • Sulphur in the sample is converted to sulphur dioxide gas.
  • The evolved sulphur dioxide is measured by an infrared absorption analyser for precise sulphur quantification.

• Procedures and Equipment

  • Sampling according to ISO 377 or equivalent national standards.
  • Essential apparatus includes a high-frequency induction furnace, ceramic crucibles, tin capsules, and an infrared gas analyser.
  • Calibration using certified reference materials and standard solutions ensures accuracy.

• Reporting and Quality Assurance

  • Results are expressed as a percentage by mass of sulphur.
  • The standard details requirements for reporting, including necessary identification details, methodology, and any deviations from standard procedure.

• Additional Information

  • Annexes provide insights into the results of international cooperative testing, graphical representation of precision data, and features of commercial induction furnaces and infrared analysers.

Applications

• Quality Assurance in Metal Production

  • Widely used in foundries, steel mills, and metallurgical laboratories for monitoring and certifying product composition.
  • Ensures steel and iron products meet industrial standards and specifications for sulphur content.

• Research and Development

  • Supports R&D in metallurgy by providing an accurate method for determining sulphur, which influences physical properties and performance of metal products.

• Regulatory Compliance

  • Enables compliance with national and international requirements for materials used in construction, automotive, machinery, and infrastructure projects.

• Process Control

  • Real-time sulphur analysis improves process control and material consistency during production.

Related Standards

• ISO 4935:1989: International equivalent standard for sulphur determination in steel and iron.
• ISO 377: Guidance for sampling and preparation of steel for chemical analysis.
• ISO 385-1, ISO 648, ISO 1042: Standards related to laboratory glassware used in sampling and preparation.
• ISO 5725: Methods for assessing the precision and reproducibility of analytical test methods.

Keywords: steel and iron sulphur determination, infrared absorption method, induction furnace combustion, metal chemical analysis, sulphur content measurement, SIST EN 24935:1997, ISO 4935:1989, metallurgical standards, CEN, laboratory procedures for steel analysis

By aligning analytical practices to SIST EN 24935:1997, manufacturers and laboratories ensure accurate sulphur quantification in ferrous metals, facilitate regulatory compliance, and support high standards of product quality and reliability in the steel and iron industry.