[en] The results of investigations are presented concerning the accuracy of geometrical dimensions of thick-walled sleeves produced by piercing on a 100-ton trio screw rolling mill MISiS with three schemes of fixing and centering the rod. The use of a spherical thrust journal for the rod and of a long centering bushing makes it possible to diminish the non-uniformity of the wall thickness of the sleeves by 30-50%. It is established that thick-walled sleeves with accurate geometrical dimensions (nonuniformity of the wall thickness being less than 10%) can be produced if the system sleeve - mandrel - rod is highly rigid and the rod has a two- or three-fold stability margin over the length equal to that of the sleeve being pierced. The process of piercing is expedient to be carried out with increased angles of feed (14-16 deg). Blanks have been made from steel 12Kh1MF

[en] The paper analyses the process features of titanium ingot deformation as well as the processes and equipment used at the process stage of large-diameter ingot working. It is noted that the deformation of large titanium-alloy ingots required the application of novel technologies and equipment. Conventional techniques of ingot deformation-length-wise rolling and forming - do not fully satisfy the present reguirements for efficiency, quality and resource-saving which are applied to titanium alloy production

[en] Rolling of experimental-industrial set of ingots 450 mm in diameter made of titanium alloys VT1-0 and VT8 was carried out from various. The studies of deformation parameters for multipass rolling were based on direct measurements of geometrical dimensions of factural deformation zone, graphical representation and analysis of mechanical deformations with application of the law on the second volumes constancy. The results obtained provide for principal possibility of creating effective technology for conversion of large-sized titanium ingots, development of the process with optimal level of deformation, kinetic and strength parameters

[en] Comparative investigations of mechanical properties, macro- and microstructure of Zr-1%Nb alloy blanks produced in hot treatment of ingots applying two methods: forging and radial-shear rolling were carried out, and the quality of semi-finished and finished products were evaluated. It was demonstrated that forging had a larger depth of the structure processing as compared with rolling that forms the material state of higher characteristics of strength and impact viscosity and provides its compactness