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：US09296040B2

公开(公告)日：2016-03-29

申请号：US13827026

申请日：2013-03-14

Applicant: NUCOR CORPORATION

Inventor： Daniel Geoffrey Edelman ,  Christopher Ronald Killmore

IPC: B22D11/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/12 ,  B22D11/12 ,  C21D8/02 ,  C22C38/06 ,  B22D11/00 ,  B32B15/01

CPC classification number: B22D11/12 ,  B22D11/001 ,  B22D11/0622 ,  B32B15/013 ,  C21D8/0215 ,  C21D8/0226 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  Y10T428/12 ,  Y10T428/12799

Abstract: A hot rolled steel strip made by the steps including assembling a twin roll caster, forming a casting pool of molten steel of such composition that the cast strip produced comprises by weight, greater than 0.25% and up to 1.1% carbon, between 0.40 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum, counter rotating the casting rolls to solidify metal shells and forming a steel strip, hot rolling the steel strip such that mechanical properties at 10% and 35% reduction are within 10% for yield strength, tensile strength and total elongation, and coiling the hot rolled steel strip at a temperature between 550 and 750° C. to provide a majority of the microstructure comprising pearlite, along with bainite and acicular ferrite. The steel may have a free oxygen content between 5 and 50 ppm or between 25 and 45 ppm.