© BS EN Cold formed welded structural hollow sections of non-alloy and fine grain steelsPartTolerances, dimensions and sectional properties Building CodeHub Cold formed welded structural hollow sections of non-alloy and fine grain This European Standard supersedes EN — This standard consists of the following parts under the general title 'Cold formed welded structural hollow sections of non-alloy and fine grain steels': − PartTechnical delivery conditions − PartTolerances, dimensions and sectio