If you just need the technical information (concepts/symbols) without the full legal standard: Structural Steel Handbook
Some countries have agreements allowing public access to standards in physical reading rooms. For example: Din 18800 1 Pdf English Free Download
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Many of the formulas and design rules from DIN 18800 are summarized in free engineering handbooks, such as the Handbook of Structural Steelwork Are you using this for a new design or to check an existing structure built before 2010? Further Exploration DIN 18800-1 - 2008-11 Din 18800 1 Pdf English Free Download