The introduction of High ductility cold rolliing ribbed steel bar production line скачать в хорошем качестве

The introduction of High ductility cold rolliing ribbed steel bar production line

The researcher, D.E.(doctor of engineering) of China Academy of Building Research, Xu Youlin introduce the advantages of the high ductility cold rolling ribbed steel bar of Anyang Heli Techtronic Co., Ltd. The researcher, D.E.(doctor of engineering) of China Academy of Building Research, Xu Youlin "Traditional improving the strengthen of rebar, One is adding alloy,the other is by cold rolling,for example, cold spring, cold drawing, cold rolling, cold twisting can improve the strengthen,and this adopted a new process called heat treatment to improve the strengthen,formerly, after improving the strengthen, its ductility is poor,deformation performance is poor, The earthquake action is not one force, it is forced displacement,Many building collapse in Wenchuan Earthquake,Its strengthen of steel reinforced bar is not low,but its ductility is too poor,crisp,brittle failure cause the structural collapse deadly, This kind of heat treatment steel reinforced bar , one is improve the strengthen, It adopts heat treatment to improve the strengthen,the process is good and mature.It not only improve the strengthen to 600Mpa or more,have great potentialities,at the same time, ductility and deformation performance is improved greatly comparing to cold rolling, formerly, the uniform elongation of cold rolling rebar is only 2%, now it can be improved to 5%, Increased 1.5 times,for example,formerly, 100M rebar will broken while it is drawn to 102M, but now, it is 105M,It is very important,Reinforcement fracture while earthquake,Rebar is not broken, Structure is collapsed,The people's life and property can be protected.So this is a very good performance advantages,one more, its cost is low, economical benifit is better,Formerly, to improve the strengthen of hot rolled rebar is add alloy element, e.g. Mn, Si,The most important is that the rare earth element is too expensive, the cost is too high to improve strengthen,there are limited resources in our country，although in our country, for example, Pangzhihua Steel plant, Chengde Steel Plant also add alloy to rebar, but it will be less and less, we have to consider our descendants,So the heat treatment to improve strengthen,and also improve the ductility,this is a big advantages,there are types rebars in our country,one is regular rebar, its strengthen is under 500Mpa,the other is the stress rebar, its strengthen is above 1000Mpa,There is a gap in the middle, 600Mpa,700Mpa,800Mpa,900Mpa, formerly, all is cold rolling rebar,cold drawing, cold rolling, cold twisting,We query to the cold rolling rebar after Tangshan Earthquake and Wenchuan Earthquake,Improving the strengthen after this kind of heat treatment is more suitable,Fill in the gas from 500Mpa to above 1000Mpa,and its ductility is improved from 2% to 5% comparing to cold rolling.so this is suitable,So this kind of rebar has good prospects in the future concrete construction” Phone: 0086-18530605031 Email: info@coldrollingmachine.com Web: http://www.coldrollingmachine.com