High hardenability, no temper brittleness, good weldability, little tendency to form cold cracks, good machinability and cold strain plasticity. Generally used in the quenched and tempered or carburized quenching state, it is used to manufacture high-pressure pipes and various fasteners, as well as higher grade carburized parts, such as gears, shafts, etc., working in non corrosive media and media with a working temperature below 250 ℃ and containing a mixture of nitrogen and hydrogen.