SIST EN ISO 2624:1998 PDF

Name: SIST EN ISO 2624:1998 — Copper and copper alloys - Estimation of average grain size (ISO 2624:1990)
SKU: SIST EN ISO 2624:1998
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Copper and copper alloys - Estimation of average grain size (ISO 2624:1990)

Название (английский):

SIST EN ISO 2624:1998

Copper and copper alloys - Estimation of average grain size (ISO 2624:1990)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 1 апреля 1998 г.
ICS:: 77.120.30
Технический комитет:: INEK - Nonferrous metals

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Описание (английский):

Specifies three procedures for estimating, and rules for expressing, the average grain size of copper and copper alloys consisting principally of a single phase. The comparison procedure (comparing the specimen with a standard chart) is most convenient and is sufficiently accurate for most commercial purposes. In cases of dispute the use of the Heyn or Jeffries procedures (intercept procedure and planimetric procedure, respectively) having higher degrees of accuracy is recommended.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты SIST

Overview

EN ISO 2624:1995 (identical to ISO 2624:1990) - "Copper and copper alloys - Estimation of average grain size" is a metallographic standard published by CEN/ISO that defines accepted methods for estimating the average grain size of copper and copper alloys that are principally single‑phase. The standard specifies three procedures (comparison, intercept/Heyn, and planimetric/Jeffries), rules for reporting results, and guidance on specimen preparation and magnification.

Key topics and requirements

Scope and specimen preparation

Applies to copper and copper alloys consisting principally of a single phase.
Specimens must be prepared to reveal grain boundaries (contrast etch) and representative fields selected (three or more fields for most cases; multiple section orientations for non‑equiaxial structures).

Comparison procedure

Direct visual or projected comparison with the standard grain size photomicrograph chart (standard charts reproduced at x75). Most convenient and adequate for commercial purposes.

Intercept procedure (Heyn)

Count grains intercepted by straight lines on an image or photomicrograph.
Practical counting requirements: at least 10 intercepts per line and a minimum of 50 intercepts for normal purposes (200 for referee cases). Grains touched by a line end count as half.
Average intercept length I = total line length / number of intercepts; to align with planimetric/comparison results multiply I by 1.13.

Planimetric procedure (Jeffries)

Count whole and partial grains within a known area (commonly 5 000 mm² area on photomicrograph/graticule). Use Jeffries’ multiplier (f) to convert counts to grains per mm², then compute average grain diameter d = 1/√m (or d = 1/f when using provided multipliers).

Reporting rules

Report individual field results or a single representative median value. For mixed grain size distributions, express area percentages of each size or range.

Applications and users

Routine quality control and acceptance testing in copper alloy production and fabrication

Metallography and microstructure characterization in research and development

Failure analysis and process optimization (e.g., annealing, recrystallization assessment)

Materials inspection laboratories, OEM and supplier material certification, and dispute resolution (where Heyn or Jeffries methods are recommended for higher accuracy)

Primary users: metallurgists, materials engineers, lab technicians, quality managers

Related standards

ISO 2624:1990 (original international text) / EN ISO 2624:1995 (CEN adoption)

Annex A of ISO 2624 references standard photomicrographs taken from ASTM E112 (Standard methods for determining average grain size)

Keywords: EN ISO 2624:1995, ISO 2624, grain size, copper and copper alloys, Heyn intercept, Jeffries planimetric, comparison procedure, metallography, average grain size estimation.

SIST EN ISO 2624:1998 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 2624:1990

Copper and copper alloys — Estimation of average grain size

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