Silicon content effect on structure and mechanical properties of 35KhN3MFA steel

Medium carbon steel with different content of silicon is undergone to normalizing and annealing as well as to austenitizing at 950 deg C for the most complete transfer of alloying elements into solid solution. A degree of bainite transformation in the process of isothermal soak is determined by dilatothermal method. It is shown that the rise of silicon content up to 0.8-1.5% is promising in assurance of improving in the strength characteristics without lowering in plasticity and impact toughness when forming the structures of martensite and bainite.