RU2004132414A - METHOD FOR PRODUCING COLD STEEL FOR DEEP DRAWING - Google Patents

Claims (1)

A method of manufacturing cold rolled steel for deep drawing, including the smelting of steel containing carbon, silicon, manganese, phosphorus, sulfur, acid-soluble aluminum, iron and unavoidable impurities, including nitrogen, casting, rolling in the rough and finish group of stands of a continuous broadband mill, winding strips in rolls, cold rolling, recrystallization annealing in a bell furnace at a temperature of at least 690 ° C with regulated heating and training, characterized in that the steel containing components is smelted in the following the ratio, wt.%: Carbon 0.01-0.06 Silicon 0.003-0.030 Manganese 0.05-0.25 Phosphorus 0.003-0.020 Sulfur 0.002-0.023 Acid-soluble aluminum 0.01-0.06 Nitrogen 0.002-0.007 Iron and inevitable impurities Rest when performing the following ratios: [Mn] · [S] = 0.045, where [Mn] and [S] are the manganese and sulfur contents, respectively, wt.%,

, where [Al] and [N] is the aluminum content of acid-soluble and nitrogen, respectively, wt.%, hot rolling in the roughing group of stands is completed with a roll thickness of at least 35 mm at a temperature assigned depending on the content of manganese and sulfur in accordance with the ratio: T _p ≥1050 + 8000 · [Mn] · [S], where T _p is the temperature of the roll after rolling in the roughing group of stands, ° C, and the regulated heating during recrystallization annealing is carried out first to a temperature of 450-500 ° C for no more than 10 hours, after which from temperatures of 450-500 ° C they are heated at a speed of no more than 20 ° C / h, at least to a temperature of 550-600 ° C, then at a speed of not more than 50 ° C / h to the annealing temperature.