# ISO 4970:1979 — Withdrawn and superseded ISO standards

For ISO 4970:1979, item title is Steel — Determination of total or effective thickness of thin surface-hardened layers; status code is 9599; successor is ISO 18203:2016; withdrawn / published date is 1979-11-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 4970:1979 _(verified: appears in the quote below)_
- **Item title:** Steel — Determination of total or effective thickness of thin surface-hardened layers _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 18203:2016
- **Withdrawn / published date:** 1979-11-01 _(verified: appears in the quote below)_

## What the source says

> 10988,IS,,ISO 4970:1979,Steel — Determination of total or effective thickness of thin surface-hardened layers,Acier — Détermination de l'épaisseur totale ou conventionnelle des couches minces durcies superficielles,1979-11-01,1,['77.040.99'],ISO/TC 17/SC 7,9599,,[61748],"['en','fr']",4,"<p>Specifies the micrographic method and the microhardness measurement method. Applies to thin surface layers, with thicknesses of less than or equal to 0.3 mm, obtained, for example, by mechanical (shot blasting, shot peening, etc), thermal (flame or induction hardening, etc) or thermochemical (carbonitriding, carburizing and hardening, etc) treatment. It is not applicable to thin surface layer which are not

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).