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ISO/FDIS 4948-1

Steels — Classification — Part 1: Classification of steels based on chemical composition

General information

Current stage: 50.00 Effective date: Jun 29, 2026

Originator: ISO

Owner: ISO/TC 17

Type: International Standard

ICS: 77.080.20

Scope

This part of ISO 4948 defines steel and gives 2.0 % carbon as the usual dividing line between steel and cast iron. The classification based on the specified values for the ladle analyses of the elements given in the table.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 4948-1:1982

NOW

IN_DEVELOPMENT
ISO/FDIS 4948-1
50.00 Final text received or FDIS registered for formal approval
Jun 29, 2026