Tracked Changes. Hot rolled products of structural steels. Technical delivery conditions for structural steels with improved atmospheric corrosion resistance|Specimen preparation, Bars (materials), Thickness, Marking, Length, Form tolerances, Tensile strength, Mechanical testing, Steels, Dimensional tolerances, Test specimens, Hollow sections, Flatness (surface), Rolling, Metal sections, Width, Elongation at fracture, Inspection, Sheet materials, Chemical composition, Strips, Surface treatment, Atmospheric corrosion, Weather resistance, Structural steels, Testing conditions, Impact strength, Weldability, Yield strength, Size, Surface defects, Designations