ISO 4935:1989

Name: ISO 4935:1989 — Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace
SKU: ISO 4935:1989
Price: 12600 RUB
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Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace

Название (английский):

ISO 4935:1989

Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 21 сентября 1989 г.
Издание:: ISO IS 4935 edition 1 version 1
ICS:: 77.080.01

Тип поставки:

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Язык документа:

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Срок поставки:2 раб. дн. (перевод)

Цена:12 600 ₽

Описание (английский):

The method is applicable to sulphur contents between 0,002 % (m/m) and 0,10 % (m/m). Specifies principle, reagents and material, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international cooperative tests. Annex B represents the precision date graphically. Annex C deals with induction furnaces and infrared sulfur analysers.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4935:1989 - "Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace" specifies a standardized laboratory method to measure sulfur in steel and iron. The method applies to sulfur concentrations from 0.002 % to 0.10 % (m/m). It defines the principle, required reagents and apparatus, sampling and test-portion preparation, measurement and calibration procedures, expression of results and reporting. Informative annexes cover interlaboratory precision data (Annex A/B) and features of induction furnaces and IR sulfur analysers (Annex C).

Key topics and requirements

Analytical principle: Combustion of a weighed test portion with a sulfur-free accelerator in a high-frequency induction furnace in a pure oxygen stream; conversion of sulfur to SO2 and measurement by infrared (IR) absorption.

Scope: Applicable range 0.002–0.10 % S (m/m).

Reagents & materials: High-purity oxygen (≥99.5 %), sulfur-free accelerator (e.g., tungsten), magnesium perchlorate dehydration agent, inert ceramic trap, pure low-sulfur iron for blanks, suitable solvents (acetone), and certified sulfur standard solutions.

Apparatus: High-frequency induction furnace with oxygen supply and purifying unit, IR gas analyser, flowmeter, tin capsules, ceramic crucibles, micropipettes (50 µl/100 µl) and class A volumetric glassware.

Sampling & test portions: Sampling per ISO 377; typical test portion masses indicated (dependent on expected sulfur level and instrument).

Calibration & blanking: Multi-point calibration using certified sulfur standard solutions deposited in tin capsules and dried, construction of calibration graph, and routine blank tests (duplicate blanks). The standard sets contamination limits (mean blank ≤ 0.005 mg S; difference between blanks ≤ 0.003 mg S).

Precision: Results of a 22-laboratory trial are summarized; precision (repeatability and reproducibility) varies with sulfur level and is presented graphically in Annex B.

Reporting: Requires method reference, sample identification, numeric results (expressed as % m/m), unusual features and any non-standard operations.

Applications and users

Practical applications:

Quality control in steel and iron production (castings, bars, sheet).
Incoming material inspection and supplier certification.
Failure analysis, R&D and process optimization where sulfur influences mechanical properties and corrosion behavior.
Regulatory compliance and contract testing where trace sulfur levels are critical.

Typical users:

Metallurgical and chemical laboratories, QA/QC technicians, process metallurgists, instrument manufacturers (induction furnaces and IR analysers), and standards bodies.

Related standards

ISO 377 (sampling and sample preparation for steel)

ISO 5725 (precision of test methods - repeatability and reproducibility)

Laboratory glassware standards referenced for volumetrics (ISO 385‑1, ISO 648, ISO 1042)

Keywords: ISO 4935:1989, sulfur determination, infrared absorption, induction furnace, steel and iron analysis, sulfur content, IR sulfur analyser, calibration, laboratory method, precision data.

ISO 4935:1989

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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