The purpose of this standard is to establish the chemical, mechanical, geometric and weight characteristics of weldable steel corrugated or grooved bars with special ductility characteristics used for reinforcing concrete structures and supplied as end products in straight or coiled form. It does not apply to other products used for reinforcing concrete, such as: Weldable steel bars (UNE 36068). Wires and strands for prestressed steel reinforcement (UNE 36094). Weldable steel wires (UNE 36099). Smooth wires (UNE 36731). Electro-welded meshes (UNE 36092 UNE 36061). Electro-welded meshes with special ductility characteristics (UNE 36060). Basic reinforcements (UNE 36739) Galvanised steels. Epoxy resin-coated steels. Corrosion-resistant steels.