ISO 4968:2022
Steel — Macrographic examination by sulphur print (Baumann method)
Steel — Macrographic examination by sulphur print (Baumann method)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 4 апреля 2022 г.
- Издание:
- ISO IS 4968 edition 2 version 1
- ICS:
- 77.040.99
This document specifies a method (Baumann) for the macrographic examination of steel by means of contact printing using silver salts and acid. The method is applicable to steels of which the sulphur content is less than 0,40 %. This method can also be applied to cast irons.
Abstract
Overview
ISO 4968:2022 - "Steel - Macrographic examination by sulphur print (Baumann method)" specifies a contact-printing procedure to reveal sulphur-bearing inclusions and segregation in steels and cast irons. The method uses photographic paper (or flat film) impregnated with an acid reagent to convert metal sulphides into hydrogen sulphide, which darkens the silver-sensitive emulsion. ISO 4968:2022 applies to steels with sulphur content up to and provides updated guidance on reagents, surface preparation, printing procedure and result classification.
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