In steel structure, the main materials used for bearing forces and transferring them are all made of steel. The connections used in this structure are welding, riveted, and screw. The design of the parts and the respective control are carried on them.

Currently, steel is among the crucial material that is used in the construction of buildings, bridges, or other fixed structures. The strength of steel (yield stress) ranges from 2400 to 27000 kgr/cm. The steel with a strength of 2400, also known as mild steel, is used for normal constructions.

Role of Steel in Construction
Steel is one of the crucial construction materials. Steel is created by recovering the iron rocks together with coke and oxygen in a blast furnace with high temperatures. The crude iron is created in this way and has between 3 to 4% carbon.

Mechanical Particulars of Steel
The most important feature of steel is the stress-strain curve, which can be used to obtain the stress and strain.

Steel as a product with specific & unique properties is used in building construction. Steel is a unique and cost-effective material in construction projects due to the capability of exact execution, specific structural behavior, the ratio of persistent to the appropriate weight, together with the possibility of rapid execution of steel structures with architectural precision and details. If the limited weaknesses of this material such as low resistance to corrosion and no resistance to severe fire are considered, the designer is provided with a wide range of capabilities that do not exist in any other material. Steel is an alloy from iron and carbon with less than 2% of carbon. In the construction steel, there is 3% carbon plus other impurities such as phosphorus, sulfur, oxygen, nitrogen, and some other materials. Construction of steel includes oxidation, separating the extra and non-necessary elements in the product of the blast furnace, and then, adding the required elements to produce the desired compound. There are four main methods for the production of steel. Including Open hearth, blowing oxygen, electrical hearth, and vacuum method.