ISO 15351:1999 PDF

Name: ISO 15351:1999 — Steel and iron — Determination of nitrogen content — Thermal conductimetric method after fusion in a current of inert gas (Routine method)
SKU: ISO 15351:1999
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Steel and iron — Determination of nitrogen content — Thermal conductimetric method after fusion in a current of inert gas (Routine method)

Название (английский):

ISO 15351:1999

Steel and iron — Determination of nitrogen content — Thermal conductimetric method after fusion in a current of inert gas (Routine method)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 16 декабря 1999 г.
Издание:: ISO IS 15351 edition 1 version 1
ICS:: 77.080.01

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Описание (английский):

This International Standard specifies a thermal conductimetric method after fusion under inert gas for the determination of nitrogen in steel and iron. The method is applicable to nitrogen contents between 0,002 % (m/m) and 0,6 % (m/m).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 15351:1999 describes a routine thermal conductimetric method for the determination of nitrogen in steel and iron. The method measures nitrogen released as N2 after high‑temperature fusion of a test portion in an inert gas stream (helium). It is applicable to nitrogen levels from 0.002 % (m/m) to 0.6 % (m/m) and is intended for laboratories performing routine composition analysis and quality control on ferrous materials.

Key topics and requirements

Principle: Fusion of a weighed test portion in a single‑use graphite crucible under high‑purity helium; nitrogen is carried as N2 and measured by a thermal conductivity detector after separation from other gases.

Scope: Applicable for steels and irons with nitrogen between 0.002–0.6 % (m/m).

Calibration: Use certified reference materials (CRMs) with matrix match; calibration sets recommended for low and higher ranges:

Low range: ~0.002, 0.01, 0.03, 0.05, 0.10 % N
Higher range: ~0.10, 0.30, 0.50 % N

Reagents and gas purity: High‑purity helium (total impurities ≤ 0.0005 % m/m); oxidation/catalyst (CuO or Pt) and purification media such as magnesium perchlorate (or anhydrous CaSO4) and NaOH (ascarite) for gas cleanup.

Apparatus: Resistive electrode (graphite crucible) furnace, helium flow control and purifying unit, glass‑wool filters; follow manufacturer instructions for instrument operation.

Quality checks:

Blank tests (duplicate) after degassing crucible; mean blank and difference between blanks must not exceed 10 μg N.
Stabilize instrument and perform trial analyses after reagent/filter changes.

Precision: Inter‑laboratory trials (23 labs) provide repeatability and reproducibility data; limits vary with nitrogen content (document contains numerical precision results).

Safety and sampling: Use crucible tongs and appropriate protective measures when fusing; sample handling and preparation per ISO 14284.

Applications and users

Metallurgical and chemical analysis laboratories performing nitrogen determination in steel and iron

Steel producers, foundries and heat‑treatment facilities for quality control

Certification and materials testing labs establishing composition for specification compliance

R&D teams developing alloys where nitrogen affects mechanical properties and corrosion resistance

Practical uses include process control, acceptance testing, alloy verification, and traceability of nitrogen values via CRM‑based calibration.

Related standards

ISO 10720 - thermal conductimetric methods for nitrogen (related techniques)

ISO 10702 - titrimetric method after distillation for nitrogen

ISO 14284 - sampling and preparation for chemical composition analysis

ISO Guides 31 & 35 - guidance on reference and certified reference materials

Keywords: ISO 15351:1999, nitrogen determination, steel and iron, thermal conductimetric method, fusion under inert gas, helium, graphite crucible, CRM, quality control.

ISO 15351:1999 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 14284:2023

Steel and iron - Sampling and preparation of samples for the determination of chemical composition (ISO 14284…

SIST EN ISO 15351:2010

Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current…

SIST EN ISO 10720:2007

Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current…

BS ISO 1070:2018

Hydrometry. Slope-area method.