Related lectures

Concept and basis of steel metallurgy

Read Lecture

Mechanical properties of steel

Read Lecture

Steel grades and qualities


Presentation of the present classes of structural steels.


The lecture approaches the classification of materials in terms of chemical composition and mechanical and technological properties. It defines the main specifications applicable to different classes of structural steels.


Due to its high strength, its good machinability, and its high economic efficiency, steel is one of the most important construction materials. Through changes in the chemical composition and in production conditions, it is possible to vary steel properties over a wide range. Steel manufacturers are able to adapt the properties to the specific requirements of applications and users (Appendix 1) [1].

As well as chemical and mechanical properties, internal soundness, surface quality and coatings, form, and geometrical dimensions are important criteria for steel product users. The steels used for structural applications are mainly hot rolled in the form of sections, plates, strip, wide flats, bars, hollow sections, and light gauge steel profiles. Such products may have undergone cold forming operations after hot rolling. Cast and forged material is also sometimes used.

In order to facilitate production, ordering, and the use of steel products, steel grades and qualities are listed in quality standards and specifications, giving chemical composition and mechanical and technological properties as delivery conditions.

This lecture deals with the classification of steel grades and gives an overview of the main grades used for structural steelwork.

Read more