Rolled reinforcing bar 600 mpa for concrete constructions
PURPOSE AND SCOPE
Rental class of strength 600 MPa is assigned for reinforcement of non - elastic and stress - resistant reinforced concrete structures. The rental can be used as reinforcing elements of monolithic and prefabricated reinforced concrete structures in the construction of industrial facilities and housing. It also can be used in structural elements of buildings in the form of separate rods, reinforcement highways and airport coverings.
THE IDEA OF DEVELOPMENT
Reinforcement rolling class of strength 600 MPa comes in the form of a periodic bar profile with diameters from 4. 0 to 18. 0 mm. It is formed in a cold plastic bag
deformation of the round rod from the ordinary low - carbon and low - alloy steel grades. It has a conditional yield point (0. 2) of at least 600 MPa, the time resistance (v) is not less than 670 MPa, the ratio 0, 2 / v is not less than 1, 08 and the total relative elongation at maximum load not less than 3% . It is manufactured with the principle of strength accumulation at recycling stages which are summarized: 1 – thermal hardening of wire rod; 2 - strengthening at the expense of cold deformation during the formation of periodic profile; 3 - strengthening of the finished product by the holiday in conditions of electrothermal tension.
MAIN ADVANTAGES OF THE DEVELOPMENT
Reinforcing bar 600 MPa for its own Mechanical properties are in accordance with DIN 488. Its application provides savings of up to 20% steel in construction due to increased strength, as well as saving up to 5% of the metal at the expense of reducing the losses on the cut.
INTELLECTUAL PROPERTY STATUS
3 patents of Ukraine were received.
The need for reinforcement grade strength of 600 MPa is more than 300 thousand tons per year.
STATUS OF READINESS OF THE DEVELOPMENT
The parameters of the technology are worked out. In terms of the metal production was manufactured a batch of reinforcing rolled coils with 600 Mpa strength class, diameter 10 mm.