Abstract
	The submitted paper analysed and discussed selected mechanical-metallurgical problems concerning relations between ways of production, chemical composition, forming  parameters and obtained technically significant properties of tungsten alloys.
	Tungsten alloys considerably surpass other metallic structural materials by their absolute strength level and relative strength (ratio of ultimate strength to density). High corrosion resistance in concentrated acids and some physical properties of tungsten alloys, such as high electric resistance, high electron emissivity, etc., also belong to their sought-after properties. These alloys are characterised not only by these highly appreciated physical and mechanical properties, but also by some specific features which cause certain problems at their production and treatment. Firstly they intensively oxidise at increased temperatures (low refractoriness). Oxygen and nitrogen diffuse into tungsten even at low temperatures and create with fit solid interstitial solutions and some chemical compounds (oxides, nitrides) that are located particularly at the grain boundaries and thus weaken bonds between them.
	Formation of interstitial solid solutions and also of chemical compounds is accompanied by a pronounced loss in mechanical properties, so called cold brittleness appears (high transition temperature). Transition temperature is not a strictly bound value but fit can vary in a broad temperature interval in dependence of contents of impurities, on gram size, production and treatment methods as well as on contents of alloying additions.