公开(公告)号：US11225697B2

公开(公告)日：2022-01-18

申请号：US14974628

申请日：2015-12-18

Applicant: NUCOR CORPORATION

Inventor： James W. Watson ,  Paul Kelly ,  David C. Van Aken ,  Christopher Ronald Killmore

IPC: C21D8/02 ,  B22D11/00 ,  B22D11/06 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/38

Abstract: A hot rolled light-gauge martensitic steel sheet made by the steps comprising: (a) preparing a molten steel melt comprising: (i) by weight, between 0.20% and 0.35% carbon, less than 1.0% chromium, between 0.7% and 2.0% manganese, between 0.10% and 0.50% silicon, between 0.1% and 1.0% copper, less than 0.05% niobium, less than 0.5% molybdenum, and silicon killed containing less than 0.01% aluminum, and (ii) the remainder iron and impurities resulting from melting; (b) solidifying at a heat flux greater than 10.0 MW/m2 and cooling the molten melt into a steel sheet less than 2.0 mm in thickness in a non-oxidizing atmosphere to below 1080° C. and above Ar3 temperature at a cooling rate greater than 15° C./s; and (c) hot rolling the steel sheet to between 15% and 50% reduction and rapidly cooling.

公开(公告)号：US11285529B2

公开(公告)日：2022-03-29

申请号：US16393250

申请日：2019-04-24

Applicant: NUCOR CORPORATION

Inventor： Daniel Morye Field ,  David C. Van Aken

IPC: B22D11/00 ,  C22C38/38 ,  C22C38/26 ,  C22C38/02 ,  C22C38/00 ,  B22D11/06 ,  C21D8/02 ,  C21D6/00 ,  C21D9/52

Abstract: Disclosed herein are TRIP (transformation induced plasticity) steel alloy thin metal strips or, stated differently, high strength, high ductility steel alloy thin metal strips formed of a composition described herein, being substantially free or free of aluminum. In being substantially free, the aluminum content is equal to or less than 0.01% by weight.