STEEL Russian patent published in 1995 - IPC

FIELD: metallurgy. SUBSTANCE: steel has the following components, wt.-% carbon 0.15-0.35; manganese 0.8-1.2; silicon 0.03-0.50; chrome 0.05-0.28; nickel 0.5-0.8; molybdenum 0.04-0.25; copper 0.01-0.30; aluminium 0.005-0.08; rare-earth metals 0-0.02; vanadium 0-0.15; alkaline-earth metals 0.001-0.02, and iron the rest at the following conditions: for providing required level of mechanical properties in normalized state the ratio must be: K10

+ K11 x carbon + K12 x nickel + K13 x manganese creep limit is above 400 MPa where: K1i multiple regression coefficient; for providing required level of mechanical properties after hardening and tempering the following ratio must be: K20+ K21 x carbon + K22 x manganese + K23 x chrome + K24 x silicon + K25· x t°t creep limit is above 600 MPa where K2i multiple regression coefficient; t°t tempering temperature, C. EFFECT: improved mechanical properties at welding providing. 7 tbl