Introduction:
Hot-rolled deformed steel rebar are finished steel bars formed by hot rolling and natural cooling. They are made of low-carbon steel and ordinary alloy steel pressed at high temperatures. They are mainly used for reinforcement of reinforced concrete and prestressed concrete structures. They are one of the most widely used steel products in civil engineering.
Hot rolled steel rebar is 6.5-9 mm in diameter, most of which are coiled into coils; those with a diameter of 10-40 mm are generally straight bars with a length of 6-12 meters. Hot-rolled steel bars should have certain strength, that is, yield point and tensile strength, which are the main basis for structural design. There are two types of hot-rolled round steel bars and hot-rolled ribbed steel bars. The hot-rolled steel bar is soft and rigid, and it will shrink when it breaks, and the elongation is large.
http://www.building-mat.net/section-steel/