The cold-rolled ribbed steel wires and bars is also called cold-rolled thread steel wires and bars. It was first developed and used by West Germany in 1968. As a new and effective construction material and the substitute for first class steel (polished and round steel bar), the product have advantages of Good Capability, Good Strength and Good holding and enveloping strength, etc.
The hot rolled steel is transformed on to precise quality high tensile steel. While cold rolling in increasing the tensile strength, the ribbing guarantees the perfect bond with concrete.
This stage of the manufacturing process determines the mechanical properties and the dimension of the bars. Quality control secures by continuous testing a high and stead quality level, surpassing what is normally requested in the standards.
This product has all the advantages of hot rolled thread steel and cold drawn polished round steel. It is superior to first class steel not only in self capability and project quality guarantee, but also in economic profit. As analyzed by technological economic analysis and tested by lots of projects, using this product of the same length as hot rolled steel bar in preparatory stress concrete hollow building plate can save more than 10% of steel and 40-60kg cement every cubic meter(m3).