ИСТИНА

Advanced method of hot stamping is one of the most effective ways to manufacture high strength heavily stressed details of complex shape for a wide range of objects of transport, construction, mining and other types of equipment while significant cost reduction. Due to stamping at elevated temperatures, the final martensitic microstructure, and reduced springback thinner and more complex parts with a high specific strength and geometrical accuracy can be produced using relatively low strength metal sheet. Based on a number of original principles the development of a new generation of steels quenching during stamping was carried out. Except a commonly applied structural strengthening, other mechanisms of fundamental enhance of the complex properties of finished products was used in the present study, viz. formation of volumetric system of nanosized phase precipitates, dispersivity and homogeneity of microstructure, while reducing the carbon content. Controlling the characteristics of nonmetallic inclusions, forms of the presence of impurities was used to improve the corrosion and cold resistance of the metal. On this basis the manufacturing technologies for hot rolled, cold rolled, including coated rolled products were developed using two types of steels for hot stamping. One of them is the boron steels. Second type is constructed according to the production principles for low-carbon martensitic steels alloyed with Si-Mn-Cr-Ni, and microalloyed with Ti-Nb-V-Mo: with low (0.08 - 0.014%), medium (0.14 - 0.22%) and high carbon content (0.22 - 0.30%) of various strength categories. It was shown that metal of products produced by hot stamping using developed rolled steels has increased to 3 times service properties (tensile strength up to 2200 MPa), in comparison with analogues, with a lower cost.