TY JOUR TI EFFICIENCY ADJUSTMENT OF STANDARD THERMAL TREATMENT OF 30HGSA STEEL KW 30HGSA steel KW thermal treatment KW bainitic hardening KW stressstrain properties KW phase change JO Bulletin of Bryansk state technical university AU Vornacheva , I.. AU Muravev, V.. AU Frolov , A.. AU Gadalov, V.. AU Rozina , T.. PY 2016 IS 2016 PB Bryansk State Technical University