Steel bars are a necessary component in the construction of many types of buildings and structures; they are often used to reinforce concrete. The types of steel bars vary according to their makeup; they include mild steel, cold drawn, high yield steel and reinforcing bars. There are specific properties that generally apply to each type.
Properties of Mild Steel Bars
Mild steel is also known as "carbon steel." It is the most common type of steel produced and used in industry. Mild steel, as defined by the American Iron and Steel Institute, must consist of no more than 2 percent carbon and contain no other alloys. It is often used in electronics and motors due to its magnetic properties. Mild steel tends to be the cheapest type of steel because of its wide range of applications, but it has poor resistance to corrosion.
Properties of Cold Drawn Steel Bars
Cold drawn steel bars are used as parts in many types of equipment, from transmission shafts to piston pins. Compared to steel bars that are made from hot rolling; cold drawn steel bars have more yield strength, as well as tensile strength, allowing them to hold up to more adverse conditions and support more stress. They are also known to have a smoother and straighter surface condition, often allowing them to be shinier and more aesthetically pleasing.
Properties of High Yield Steel Bars
High yield steel bars are made to support extreme stress, often with a minimum tensile strength of up to 1,300 MPa. This makes them important in the manufacturing of cranes and large steel structures. They also have advantageous bending properties, and can be welded easily. Because of the strength of high yield steel bars, they are often important in reducing the amount of steel required for a project without compromising the integrity of the building or design.
Properties of Rebar
Reinforcing bar, known as "rebar," is most commonly used in concrete and masonry foundations. As with mild steel, it is generally made from carbon. Rebar is ridged to allow it to grip to the concrete better and increase the support it provides. Because rebar is made from unfinished tempered steel, it can be susceptible to rusting. Stainless steel or galvanized rebar may be used in situations that might increase the likelihood of rusting, such as in salt water.