TY JOUR TI INCREASE OF ENDURANCE AND WORKING CAPACITY OF STRUCTURAL STEEL BY ADDITIONAL CHEMICAL-THERMAL TREATMENT USING NITROGENOUS-CARBONIC CARBURIZERS KW structural steel KW chemical-thermal treatment KW nitrogen case-hardening KW gas black KW carbamide KW iron sinergisty potassium KW carburizer KW performance attributes KW carbon KW nitrogen KW carbonitride JO Bulletin of Bryansk state technical university AU Ignatenko , N.. AU Kovalev, S.V. AU Filonovich , A.. AU Gadalov, V.. AU Vornacheva , I.. PY 2017 IS 2017 PB Bryansk State Technical University