公开(公告)号：US20170226609A1

公开(公告)日：2017-08-10

申请号：US15518905

申请日：2015-08-03

申请人： ThyssenKrupp Rasselstein GmbH ,  THYSSEBKRUPP AG

发明人： Blaise MASSICOT ,  Manuel KÖHL ,  Burkhard KAUP ,  Reiner SAUER ,  Ricarda KLEMMER ,  Chrysanthus KIEWITZ

IPC分类号： C21D9/46 ,  C21D8/02 ,  C21D1/76 ,  C21C7/00 ,  F27D3/16 ,  C21D1/42 ,  C21D1/40 ,  F27D11/04 ,  F27D11/06 ,  C23C8/26 ,  C21D9/00

CPC分类号： C21D9/46 ,  C21C7/00 ,  C21D1/40 ,  C21D1/42 ,  C21D1/76 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0257 ,  C21D8/0273 ,  C21D9/0062 ,  C22C38/00 ,  C22C38/001 ,  C23C8/02 ,  C23C8/26 ,  C23C8/80 ,  F27D3/16 ,  F27D11/04 ,  F27D11/06 ,  F27D2003/166 ,  Y02P10/253

摘要： A method for producing a nitrided packaging steel from a hot-rolled steel product with a carbon content of 400 to 1200 ppm, utilizing a cold-rolling of the steel product to a flat steel product, subsequent recrystallization annealing of the cold-rolled flat steel product in an annealing furnace, in particular a continuous annealing furnace. A nitrogen-containing gas is supplied into the annealing furnace and is directed at the flat steel product to introduce unbonded nitrogen into the flat steel product in an amount corresponding to a concentration of more than 100 ppm, or to increase the amount of unbonded nitrogen in the flat steel product to a concentration of more than 100 ppm, and subsequent cooling of the recrystallized annealed flat steel product at a cooling rate of at least 100 K/s directly after the recrystallization annealing. Using this method, cold-rolled flat steel products may be produced for packaging purposes with a tensile strength of more than 650 MPa and in particular between 700 and 850 MPa.