NA 021
DIN Standards Committee Iron and Steel
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Steels - Classification - Part 1: Classification of steels into unalloyed and alloy steels based on chemical composition
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2025-01-09
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ISO/AWI 4948-1
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NA 021-00-19-01 UA - Classification, designation and numbering of steels
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ISO/TC 17/WG 30 - Revision of ISO 4948-1