专利名称：ULTRA-HIGH STRENGTH, WELDABLE STEELS
WITH EXCELLENT ULTRA-LOWTEMPERATURE TOUGHNESS
发明人：TAMEHIRO, Hiroshi;-Nippon Steel
Corporation Techni,ASAHI, Hitoshi;-NipponSteel Corporation Technical,HARA, Takuya;-Nippon Steel Corporation Technical
D,TERADA, Yoshio-Nippon Steel CorporationKimitu Wor,LUTON, Michael, J.,KOO,Jayoung,BANGARU, Narasimha-Rao,V.,PETERSEN, Clifford, W.
申请号：EP98938183.5申请日：19980728公开号：EP1025272A1公开日：20000809
摘要：A steel plate having a tensile strength of at least about 930 MPa (135Ksi), atoughness as measured by Charpy V-notch impact test at least about 120 joules (88 ft-lb), and a microstructure comprising at least about 90 volume percent of a mixture offine-grained lower bainite and fine-grained lath martensite, wherein at least about 2/3 ofsaid mixture consists of fine-grained lower bainite transformed from unrecrystallizedaustenite having an average grain size of less than about 10 microns and comprising ironand specified weight percentages of the additives: carbon, silicon, manganese, copper,nickel, niobium, titanium, aluminum, calcium,rare earth metals, and magnesium, is
prepared by heating a steel slab to a suitable temperature; reducing the slab to formplate in one or more hot rolling passes (10) in a first temperature range in which
austenite recrystallizes; further reducing said plate in one or more hot rolling passes (10)in a second temperature range in which austenite does not recrystallize, quenching (12)said plate to a suitable quench stop temperature (16); and stopping said quenching andallowing said plate to air cool (18) to ambient temperature.
申请人：Exxon Mobil Upstream Research Company,NIPPON STEEL CORPORATION
地址：3120 Buffalo Speedway,P.O. Box 2189 Houston, TX 77252-2189 US,6-3 Otemachi2-chomeChiyoda-ku Tokyo 100-71 JP
国籍：US,JP
代理机构：HOFFMANN - EITLE
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