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About This Item
This part of ISO 4951 specifies the requirements for hot-rolled bars and sections of diameter or thickness ≤150 mm in high yield strength steels in the thermomechanically-rolled condition in the grades and qualities given in Table 1 and Table 2 for use in bolted, riveted or welded structures1).
1) Compared with mild steels, these steels may require special precautions for welding. See the guide Welding and weldability of C-Mn micro-alloy steels, published by subcommission IX-G of the International Institute ofWelding (document IIS/IIW 843-84).