INTRODUCTION
The main shortages of light section bars production are high energy and material consumption and low productivity (less then average) of the rolling mill. It depends on small mass of one meter length stock and the finishing roll's speed.
The well known Canadian technology which has been developed by Co-Steel International and improved by Japanese Nippon Kokkan, is used now for the production of light section steel bars. This technology consists in formation the round shape double strands work piece and following division it on two separate strands by special wedge rolls device.
Among the disadvantages of that technology there are:

• necessity in very thin bridge between round strands, which highly decreases the term of normal roll's work;
• appearance of the agnail at the place of separation;
• construction of separation device is very complex and there is necessity in special zone for plasma restoration of the wedge rolls, assembling and setting the device;
• use of complex controlled guide fittings, which requires high skills of working personal;
• luck of possibility to produce very light sections bars because of longitudinal nonstability of the workpiece.

NEW TECHNOLOGY
New technology consists in formation of two-strand workpiece, consisting of two square bars, connected among themselves on a diagonal with a bridge from the single stock and longitudinal division of workpiece on two separate bars by the work rolls. Technology Is based on new method of longitudinal division by work rolls, and use of the developed by authors special guide fittings.

RESULTS.
As we found out all mentioned above disadvantages are absent In newly developed technology. The technology can be realized in groups of stands with various orientation of rolls axes. Depending on throughout of main and auxiliary equipment, the technology provides increase of light-section rolling mills hour productivity on 15-80% and output on 3-6 kg/ton, decrease of specific charge of the electric power on metal deformation on 20-30 Z and specific charge of work rolls on 15-30 Z, can promote an increase of initial stock transverse section and increase of productivity for previous billet mills. The technology of production of concrete-reinforcing bars NIZ and NIO by double groove rolling-division process is Introduced and could be presented on Krivoy Rog Metallurgical Combine "Krivorogstal" at two light-section mills. New technology could be used at the metallurgical enterprises for the production of periodical reinforcement steel bars at the light sections rolling mills any construction (continuous, semi continuous, etc.).

FURTHER PROPOSALS
For the realization of new technology there is necessary to design new grooving of work rolls, and to produce and set on special guide fittings and Intermediate tables between the mill stands. Authors are able to design all the auxiliary equipment, rolls grooving and regimes of rolling process, evaluate the effectiveness of technology for specific customer conditions. If necessary there is a possibility to make the auxiliary equipment and provide an engineering service.

PROBABLE PARTNERS
Probable customers of this technology could be firms-producers of rolled products and firms-designers and producers of the rolling equipment and rolling mills.

PATENT STATUS
    The specified technology surpasses known analogues in world practice and is protected by the copyright certificates and patents of Ukraine.