---
type: "WebPage"
title: "Determination of grain size according to NF EN ISO 643 on steels"
description: "You wish to determine the grain size according to NF EN ISO 643 on steels Firstly, NF EN ISO 643 specifies a method for the micrographic determination of the apparent ferritic or austenitic grain size of steels. It describes the..."
resource: "https://filab.fr/en/our-services/our-analysis-services/laboratory-analysis-powder-characterization/determination-grain-size-according-to-nf-en-iso-643-on-steels/"
tags: ["EN", "pll_62f11233626d8", "Thomas GAUTIER"]
timestamp: "2026-04-20T14:06:57Z"
published: "2023-04-19T11:33:47Z"
language: "en"
author: "bwa"
---

# Determination of grain size according to NF EN ISO 643 on steels

## You wish to determine the grain size according to NF EN ISO 643 on steels

Firstly, NF EN ISO 643 specifies a method for the[micrographic determination](https://filab.fr/en/our-technical-resources/laboratory-analysis-sem-scanning-electron-microscopy/micrographic-analysis-sem-laboratory.md) of the apparent ferritic or austenitic grain size of steels. It describes the methods for highlighting grain boundaries and estimating the average grain size of a sample with a unimodal grain size distribution. It also defines the principle, the selection and preparation of the sample, the characterisation of the grain size, and the test report.

Therefore, the support of a competent laboratory equipped for the micrographic analysis of metal powders is indispensable for the determination of grain size according to NF EN ISO 643.

## FILAB is able to determine the grain size according to NF EN ISO 643 on steels

In order to support manufacturers in the development and quality control of their products, by following the regulatory evolutions, the [FILAB](https://filab.fr/en/) laboratory provides a state-of-the-art [analytical park](https://filab.fr/en/our-technical-resources.md) of 2100m², allowing to determine the grain size according to the NF EN ISO 643 standard on steels.

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## OUR SERVICES

[Grain Size Determination - ASTM E112](https://filab.fr/en/our-services/our-analysis-services/laboratory-analysis-powder-characterization/grain-size-determination-according-to-astm-e112-for-any-type-of-alloy/)

Characterisation of metal powders for metallurgy

[Granulometric analysis](https://filab.fr/en/our-services/our-analysis-services/laboratory-granulometric-analysis.md)

[Density analysis of a powder](https://filab.fr/en/our-services/our-analysis-services/laboratory-analysis-powder-characterization/analysis-of-the-density-of-a-powder-in-the-laboratory/)

### Our accreditations

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The FILAB laboratory is accredited by COFRAC (French Accreditation Committee) – Laboratories section – for its departments in Chemistry, Metallurgy, Organic Chemistry, Chemical Expertise, Materials Expertise, and Environment in the following fields: 

✔️ Physicochemical analysis of metallic materials
✔️ Physicochemical analysis of cosmetic and pharmaceutical products
✔️ Physicochemical analysis of medical devices, medical equipment, and chemical and biological products

Scope available No. 1-1793

This [Nadcap accreditation](https://filab.fr/en/about-us/accreditations-en/materials-testing-nadcap-laboratory.md) notably covers:
✔️ Chemical analysis (ICP-OES) of critical metallic alloys (Al, Fe, Ni, Ti)
✔️ Metallography

An international recognition that confirms our commitment to quality and reliability for the most demanding applications, particularly in the aerospace sector.

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