TY JOUR TI THE PROBLEM OF PRODUCING SHARPLY BENT ELBOWS FROM HEAT-RESISTANT STEELS KW horn core KW sharp bend KW hot drawing KW heat-resistant steels KW tooling durability JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Baranov, D.S. AU Hurtasenko, A.V. AU Voronkova, M.N. AU Duganov, V.Y. AU Latyshev, S.S. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov