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1.1 This Part of EN 10263 specifies the general technical delivery conditions for round rod, round bars and wire for cold heading and cold extrusion made of: -a) non alloy steels not intended for heat treatment after cold working, as specified in EN 10263-2; -b) non alloy and alloy steels for case hardening as specified in EN 10263-3; -c) non alloy and alloy steels for quenching and tempering as specified in EN 10263-4; -d) stainless steels as specified in EN 10263-5. 1.2 Parts 2,3 and 4 of this EN 10263 cover products having a diameter up to and including 100 mm. Part 5 covers products having a diameter up to and including: - 25 mm for ferritic and austenitic-ferritic steels; - 50 mm for austenitic steels; - 100 mm for martensitic steels. 1.3 In special cases supplementary requirements or deviations with respect to this European Standard may be agreed between the purchaser and the supplier at the time of enquiry and order (See Annex B). 1.4 The general technical delivery conditions in EN 10021 also apply to products supplied in accordance with this European Standard