International organizations and associations (AISC, SCI, ECCS, etc.) provide an increase of the use of structural steel as a basic synthetic material bearing structure such as new products (eg high-strength steel) create increased opportunities for further exploitation the creative imagination of engineers and the fact that the material meets the conditions of sustainable development engineering (fully recyclable material, combined with natural materials like stone and wood).
Generally there is a wide variety of steel which, as known, are used in many fields such as the construction tools, agricultural machinery, machine parts, etc. However, the technical work needed steels with low carbon so that together with the appropriate treatment to produce a product that combines possible increased strength, durability and in any case increased ductility. The two main types of structural steels used in civil engineering is non-alloy steels such as the common steels, high strength steels and alloy steels such as corrosion steels (weathering steel), stainless steel (stainless steel). The term alloy steel is defined as a steel whose content and weight of alloying elements (eg nickel, chromium, silicon, etc.) is greater than 5% in order to achieve improvement of certain characteristics such as resistance to corrosion at low temperatures, etc.
Besides the above mentioned as an important impetus to the development of mineral projects will give the introduction of the final framework of Eurocodes. The final texts give the designer and the manufacturer with a solid foundation for application in civil engineering high-strength steels and stainless steels. Specifically:
• The EC-3, Part 1-1:2005 introduces the design of high-strength steels S420 and S460 while allowing and corresponding buckling curve, d (Table 6.1, EC-3, Part 1-1).
• O EC-3, Part 1-4:2006 specifies the design construction of stainless steel.
• O EC-3, Part 1-12:2005 prescribe additional rules for extending the application of EC-3, Part 1-1:2005 order for him to apply to a used high-strength steels (eg S500, S690, etc.)
• The EC-3, Part 1-10:2003 specify the rules of resistance of structural steel in order to choose the right quality of steel depending on the conditions of work (eg low temperature) on information are strained in tension, fatigue with tensile influence.