Abstract
	A large testing programme of an HSLA strip steel grade S 500 MC was conducted. The experiment was based on combination of cold rolling, recrystallization annealing, mechanical testing and metallographic examinations. Samples in the form of strips with dimensions 4 x 25 x 340 mm were rolled in several passes with total height reduction 5 to 75 %. Particular partial strains were realized at room temperature in the housingless, hydraulically pre-stressed laboratory mill Q110. Afterwards the laboratory mill products were annealed in the vacuum furnace with the protective gas atmosphere consisting of N2+H2. The annealed samples underwent the mechanical testing. The gained results yield stress YS [MPa], ultimate tensile strength UTS [MPa] and their ratio, as well as elongation A80 [%], were summarized in graph in dependence on relative height reduction before annealing – ? [%]. The found out points were plotted in a coordinate system and the corresponding curves were constructed „in a manual way“, without any exact mathematical rules. 
	It was confirmed that by a suitable combination of previous total cold reduction and parameters of the following recrystallization annealing it is possible to influence a complex of mechanical properties of particular strips. By the described way it is possible to homogenize microstructure of strip and gain a major share of equiaxed grains of ferrite, but an average size of resulting grains is by no means significantly smaller than that one after hot rolling. Particular trends of strength and plastic properties correspond to each other. These trends are caused by structure-forming processes which were documented by micrographs. Therefore achieved results can be used in practice mainly for optimization of conditions of heat treatment of the investigated steel in cold rolling mills.