SIST EN ISO 7526:2020

Name: SIST EN ISO 7526:2020 — Ferronickels - Determination of sulfur content - Infrared absorption method after induction furnace combustion (ISO 7526:2020)
SKU: SIST EN ISO 7526:2020
Price: 34200 RUB
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Ferronickels - Determination of sulfur content - Infrared absorption method after induction furnace combustion (ISO 7526:2020)

Название (английский):

Ferronickels - Determination of sulfur content - Infrared absorption method after induction furnace combustion (ISO 7526:2020)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 19
Дата публикации:: 23 апреля 2020 г.
Издание:: ISO 7526:2020
ICS:: 77.120.40

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Описание (английский):

This document specifies an infrared absorption method after combustion in an induction furnace for the determination of the sulfur content in ferronickels in the range of 0,002 % to 0,12 %. The method is applicable to normal production operations. It uses commercially available equipment, which is calibrated using steel and/or ferronickel certified reference materials (CRMs).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 7526:2020 specifies an infrared absorption method after induction‑furnace combustion for the determination of sulfur content in ferronickels. The method covers sulfur mass fractions from 0.002% to 0.12% and is intended for routine use in normal production operations. It relies on commercially available sulfur analysers and calibration with certified reference materials (CRMs).

Key topics and technical requirements

Principle: Combustion of a test portion in a high‑frequency induction furnace in a stream of pure oxygen; conversion of sulfur to SO2 and measurement by infrared (IR) absorption.

Scope and range: Applicable to ferronickels with sulfur from 0.002% to 0.12%.

Reagents and gases:

High‑purity oxygen (≥ 99.5%); purification possible with oxidation catalyst, CO2 and H2O absorbents.
Inert ceramic (attapulgus clay) impregnated with NaOH for CO2 absorption.
Magnesium perchlorate for moisture absorption and glass‑wool filters.

Fluxes & accelerators: Used to improve furnace coupling and combustion (examples: tin, copper, vanadium pentoxide; accelerators such as Cu, Fe, W, Ni). All additions must have low sulfur and be accounted for in calibration.

Blank limit: Total blank from oxygen, refractories, flux and accelerator shall not exceed 0.0005% sulfur (mass fraction).

Apparatus & operation:

High‑frequency induction furnace and IR sulfur analyser per manufacturer instructions.
Typical oxygen flow: ~0.5 L/min on standby, ~2.0 L/min during combustion (instrument dependent).
Combustion temperatures often exceed 1 700 °C to ensure complete volatilization of SO2.
Calibration using steel and/or ferronickel CRMs certified by recognized bodies; preference for referee methods traceable to SI.

Quality control: Instrument stabilization, blank tests, calibration procedures and precision data are described to ensure reproducibility.

Applications and practical value

Routine sulfur analysis in ferronickel production and QA/QC laboratories.

Useful for metallurgists, process control engineers, analytical chemists, and testing labs needing reliable sulfur determinations for alloy specification compliance.

Helps producers monitor sulfur-related properties (e.g., embrittlement, inclusion behavior) and optimize smelting or refining processes.

Employs commercially available analysers, making it suitable for integration into production‑scale testing workflows.

Related standards

Reference and calibration preference: ISO 4934, ISO 4935, ISO 10701, ISO 13902 (referee methods and CRMs).

EN ISO 7526:2020 supersedes earlier EN 27526 (1991) and aligns with ISO/TC 155 guidance for nickel alloys.

Keywords: EN ISO 7526:2020, ferronickel sulfur determination, infrared absorption, induction furnace combustion, sulfur analysis, CRMs, metallurgical QA/QC.

SIST EN ISO 7526:2020

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and practical value

Related standards

Технические детали

ISO 7526:2020

Ferronickels — Determination of sulfur content — Infrared absorption method after induction furnace combustion

SIST EN ISO 4934:2004

Steel and iron - Determination of sulfur content - Gravimetric method (ISO 4934:2003)

SIST EN 24935:1997

Steel and iron - Determination of sulphur content - Infrared absorption method after combustion in an inducti…

ISO 1070:1992/Amd 1:1997

Liquid flow measurement in open channels — Slope-area method — Amendment 1

ISO 1390-2:1977

Maleic anhydride for industrial use — Methods of test — Part 2: Measurement of colour of the molten material