CARBON STEEL SHEETS PRODUCTION METHOD Russian patent published in 2007 - IPC C21D8/04 C21D1/26 

FIELD: metallurgy, namely process for manufacturing cold rolled strips of construction high-quality carbon steel for cold forming.

SUBSTANCE: method shortening time period of recrystallization annealing and simultaneously providing high mechanical properties of steel sheets comprises steps of cold rolling of strips; subjecting pile of steel coils in hood furnace to recrystallizaton annealing at heating till annealing temperature 690 - 710°C and cooling them; in temperature range 190 - 210°C before annealing temperature heating coils at rate no more than 72°C/h; cooling coils at first till temperature 650 -680°C for time period 7 - 15 h after termination of which completing cooling stage at arbitrary rate. Cold rolling is performed at total percentage reduction 55 -80% while used carbon steel contains next ingredients, mass%: carbon, 0.02 - 0.12; manganese, 0.08 - 0,55; aluminum, 0.01 - 0.10; silicon, less than 0.05; phosphorus, less than 0.03; sulfur, less than 0.03; nitrogen, less than 0.012; iron, the balance.

EFFECT: shortened time period of recrystallization annealing, improved mechanical properties of carbon steel sheets.

3 cl, 4 tbl, 1 ex