ISO 4967:2013

Name: ISO 4967:2013 — Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams
SKU: ISO 4967:2013
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Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams

Название (английский):

ISO 4967:2013

Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 39
Дата публикации:: 24 июля 2013 г.
Издание:: ISO IS 4967 edition 3 version 1
ICS:: 77.040.99

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Описание (английский):

ISO 4967:2013 specifies a micrographic method of determining the non-metallic inclusions in rolled or forged steel products having a reduction ratio of at least 3 using standard diagrams. This method is widely used to assess the suitability of a steel for a given use. However, since it is difficult to achieve reproducible results owing to the influence of the test operator, even with a large number of specimens, precautions should be taken when using the method. ISO 4967:2013 also provides for the determination of non-metallic inclusions by image analysis technologies.

Abstract

Похожие стандарты

Другие стандарты ISO

Overview

ISO 4967:2013 - Steel: Determination of content of non‑metallic inclusions - micrographic method using standard diagrams - defines a standardized metallographic procedure to assess non‑metallic inclusions in rolled or forged steels (reduction ratio ≥ 3). The standard uses chart diagrams (Annex A) for visual comparison at 100× magnification in a 0.50 mm² square field and also provides for the use of image‑analysis technologies (Annex D). It is widely used in steel testing, quality control and material acceptance, with caveats about operator influence and reproducibility.

Keywords: ISO 4967, non‑metallic inclusions, micrographic method, steel testing, metallography, inclusion content, image analysis

Key topics and technical requirements

Scope and applicability

Applies to rolled or forged steel products with a reduction ratio of at least 3; some steels (e.g., free‑cutting steels) may require special treatment.

Principle

Compare observed microscope fields to standard chart diagrams representing five inclusion groups: A (sulfide), B (aluminate), C (silicate), D (globular oxide) and DS (single globular).

Observation conditions

Standard observation at 100× magnification on a square field of 0.50 mm²; same magnification/method must be used for charts and test.
Use of a reticle or overlay (grid) is required for reproducible rating and measurements.

Methods of examination

Method A: record the worst field for each inclusion type (fine and thick series).
Method B: rate each field individually against the chart diagrams and record indices.

Indices and reporting

Diagrams carry index numbers (0.5 to 3) indicating increasing inclusion content; thickness classes (fine, thick) and oversized inclusion reporting are required.
Non‑traditional inclusions are assigned to the best morphological group and identified with a descriptive subscript in the report.

Sampling and specimen prep

Specimen polished surface ≈ 200 mm² (example: 20 mm × 10 mm), cut parallel to the product axis and located between surface and center; sampling details and number of samples are defined in product standards or by agreement.

Image analysis

Annex D provides guidance for using image‑analysis technologies to determine total inclusion length, count or diameter for better reproducibility.

Applications and users

Who uses ISO 4967

Steel producers, metallurgists, inspection laboratories, quality control engineers, material certifiers and product specifiers.

Practical uses

Acceptance testing for mechanical components, process control in steelmaking, failure analysis, supplier qualification, and assessing steel suitability for critical applications (bearing, forging, structural components).

ISO 4967:2013

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards / references

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