# ISO 946:1975 — Withdrawn and superseded ISO standards

For ISO 946:1975, item title is Grey cast iron — Beam unnotched impact test; status code is 9599; successor is ISO/NP 946; withdrawn / published date is 1975-11-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 946:1975 _(verified: appears in the quote below)_
- **Item title:** Grey cast iron — Beam unnotched impact test _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/NP 946
- **Withdrawn / published date:** 1975-11-01 _(verified: appears in the quote below)_

## What the source says

> 5366,IS,,ISO 946:1975,Grey cast iron — Beam unnotched impact test,Fonte grise — Essai de choc sur éprouvette non entaillée,1975-11-01,1,['77.040.10'],ISO/TC 25,9599,,[36166],"['en','fr']",3,"<p>Specifies requirements for the determination of the impact strength. The test consists in breaking a series of unnotched machined cylindrical test pieces resting freely between supports, and measuring the difference between the kinetic energy of the hammer before and after fracture of the test piece. Annex A includes non-standard test pieces, annex B includes notes on coefficients for calculation of impact strength.</p>"

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).