THE RIGHT CHOICE OF STEEL according to the （根据钢的正确的选择）.pdf

THE RIGHT CHOICE OF STEEL - according to the Eurocode - 1 1 2 Oliver Hechler , Georges Axmann and Boris Donnay 1 ArcelorMittal, Commercial Sections, Technical Advisory, Luxembourg 2 ArcelorMittal Esch, Research and Development, Structural Long Products, Luxembourg ABSTRACT In general, the choice of the steel grade is ruled in Eurocode EN 1993-1-1. Several requirements are specified: choice according to the material properties, ductility requirements, toughness properties and through-thickness properties. With reference to these requirements on the mechanical characteristics, modern hot-rolled structural sections are produced by precise control of the temperature during the rolling process. Fine grain steels, produced using thermomechanical rolling (delivery condition M according to EN 10025-4), feature improved toughness values which give a lower carbon equivalent and a fine microstructure when compared with conventional or normalised steels. This paper gives guidance on and background to the right choice of the steel grade according to the Eurocode. Furthermore, the influence of the production process on this choice is highlighted and the advantages of thermomechanical steels for each criterion are discussed. KEYWORDS steel, production, steel grade, material properties, ductility, toughness, weldability INTRODUCTION Eurocode 3 [EN 1993-1-1 (2005)] applies to the design of buildings and civil engineering works in steel. It complies with the requirements and principles for the safety and serviceability of structures, the basis of their design and verification that are given in EN 1990 – Basis of structural design. Requirements are provided for resistance, serviceabili