【正文】 stressed by 4 hydraulic nuts. It was designed for cold rolling of even very thin and high strength narrow strips. Rolls setting is manual with linear sensor measurement (accuracy mm). Basic parameters:?? nominal diameter of work roll 62 mm。 ?? prediction of rolling forces (validation of mathematical models of deformation resistance). Basic advantages of the selected type of physical modelling are as follows: ?? high affinity to real conditions。tkovice) and supplies data for mathematical modelling (FEM). In cooperation with other grant projects and based on purchase orders from metallurgical and machine plants the following questions are solved:?? structureforming processes associated with forming and thermomechanical treatment of metal materials (influence on resulting properties, optimization of technologies)。nek, Effect of cold rolling and annealing on mechanical properties of HSLA steel, Archives of Materials Science and Engineering 36/1 (2009) 4147.PROPERTIESStructure and resulting material properties are significantly influenced by cold rolling because in the given terms no recrystallization can occur. Extension of grains in the direction of rolling occurs and the arrangement of crystallographic lattice getsa directional haracter. Banding character of other structural phases, such as of inclusions, pearlitic blocks, etc. has been developed too. Three types of texture (. deformation, structuraland crystallographic texture) arise, which yields in a directional character of mechanical roperties – see Fig. 1 [9]. Heat treatment is included after cold forming for removal of anisotropy of properties. To factors influencing the final character of microstructure after annealing belong most importantly: the initial character of material structure before cold forming, the total cold reduction,annealing conditions (temperature and time) and also coolingspeed [1,5,6,7,10,13,15,17, 18, 19]. More and more progressive types of material have been used in this field of processing – see . [2,3,8,11,16]. As a whole, the more cold deformation of aterial before annealing, the lower initial temperature of recrystallization. At low temperatures the time necessary for finishing of recrystallization is much higher and the requiredspheroidizing of carbides cannot be pleted [4]. Disarranged state Structure oriented by deformationFig. 1. Illustration of origin of deformation textures of metal [9]Strength or hardness properties of material generally decrease with increasing temperature of annealing, whereas plastic properties increase. Substantial lowering of strength values occurs at temperatures which are close to 600 176。, M. R??i?ka, L. ?237。 published in revised form ABSTRACT Purpose: was to examine effect of the parameters of cold deformation and recrystallization annealing on mechanical properties of a Nbmicroalloyed HSLA steel.Design/methodology/approach: Research of strip steel QStE 420 was based on a bination of laboratory cold rolling, recrystallization annealing in vacuum furnace, mechanical (particularly tensile) tests andmetallographic analyses.Findings: It was validated that by a sophisticated bination of size of previous cold reduction size and parameters of the following annealing it is possible to impact markedly a set of final properties of particular strips.Formability of the studied HSLA steel rises and vice versa strength properties fall with an increasing temperature of annealing.Research limitations/implications: The experiment should be supplemented by additional TEM analyses explaining the behaviour and role of precipitates.Practical implications: The experimentally obtained particular trends of mechanical properties may be utilized for optimization of conditions of heat treatment of the investigated HLSA steel in a cold strip rolling mill, reflecting the specific requirements for a relation between strength and plastic properties.Originality/value: Experimental potentialities of the Institute of Modelling and Control of Forming Processes in the sphere of cold rolling and heat treatment were introduced in their integrity for the first time.Keywords: Mechanical properties, HSLA steel strip, Cold rolling, Recrystallization annealingReference to this paper should be given in the following way:I. Schindler, M. Jano?ec, E. M237。nek aa .nstitute of Modelling and Control of Forming Processes, V?B – Technical University of Ostrava, Czech Republic HUT – V225。ek a, . Dobrza241。ka b, L. 200。 b, M. R249。, Thermomechanical treatment of HSLA steel QStE 480MC, Proceedings of the 11th Scientific International Conference “Achievements in Mechanical and Materials Engineering” AMME’2002, Gliwice ?? Zakopane, 2002, 641644. [18] W. Ozgowicz, E. KalinowskaOzgowicz, A. Kurc: Influence of plastic deformation on structure and mechanical properties of stainless steel type X5CrNi1810, Archives of Materials Science and Engineering 32/1 (2008) 3740. [19] Kurc, Z. Stoklos, Some mechanical and magnetic properties of cold rolled X5CrNi188 stainless steel, Archives of Materials Science and Engineering 34/2 (2008) 8994. [20]