公开(公告)号：US12065718B2

公开(公告)日：2024-08-20

申请号：US17432129

申请日：2020-03-06

申请人： NIPPON STEEL CORPORATION

发明人： Ryotaro Miyoshi ,  Tomonori Kunieda ,  Kazuhiro Takahashi

IPC分类号： C22C14/00 ,  C22F1/18

CPC分类号： C22C14/00 ,  C22F1/183

摘要： A bar includes a titanium alloy containing an α phase and a β phase, in which the titanium alloy contains, as a chemical composition, by mass %: Al: 4.5% to 6.4%; Fe: 0.5% to 2.1%; C: 0.01% or less; N: 0.05% or less; O: 0.25% or less; V: 0.10% or less; Si: 0% to 0.40%; Ni: 0% to 0.15%; Cr: 0% to 0.25%; Mn: 0% to 0.25%; and a remainder including Ti and impurities, an area ratio of the β phase in a metallographic structure of the titanium alloy is 20% or less, and an average minor axis length of grains of the β phase is 2.0 μm or less.

公开(公告)号：US12000021B2

公开(公告)日：2024-06-04

申请号：US17281029

申请日：2019-10-07

申请人： NIPPON STEEL CORPORATION

发明人： Ryotaro Miyoshi ,  Tomonori Kunieda ,  Kazuhiro Takahashi ,  Tatsuo Yamazaki ,  Akira Kawakami

IPC分类号： C22C14/00 ,  C21D8/06 ,  C21D9/52

CPC分类号： C22C14/00 ,  C21D8/06 ,  C21D9/525

摘要： An α+β type titanium alloy wire contains, in mass %, Al: 4.50 to 6.75%, Si: 0 to 0.50%, C: 0.080% or less, N: 0.050% or less, H: 0.016% or less, O: 0.25% or less, Mo: 0 to 5.5%, V: 0 to 4.50%, Nb: 0 to 3.0%, Fe: 0 to 2.10%, Cr: 0 to less than 0.25%, Ni: 0 to less than 0.15%, Mn: 0 to less than 0.25%, and the balance being Ti and impurities, the contents of Al, Mo, V, Nb, Fe, Cr, Ni, and Mn satisfying an equation, in which an average aspect ratio of an α crystal grain is 1.0 to 3.0, a maximum crystal grain diameter of the α crystal grain is 30.0 μm or less, an average crystal grain diameter of the α crystal grain is 1.0 to 15.0 μm.

公开(公告)号：US11479839B2

公开(公告)日：2022-10-25

申请号：US16757140

申请日：2017-10-26

申请人： NIPPON STEEL CORPORATION

发明人： Yoshitsugu Tatsuzawa ,  Tomonori Kunieda ,  Kenichi Mori ,  Kazuhiro Takahashi ,  Hideki Fujii

IPC分类号： C22F1/18 ,  B21B1/02 ,  B21B3/00

摘要： A method for producing a hot-rolled titanium plate includes, [1] melting at least one part of the side surface of the titanium slab by radiating a beam or plasma toward the side surface, not toward the surface to be rolled, and thereafter causing re-solidification to form, in the side surface, a layer having grain diameter of 1.5 mm or less and a depth of 3.0 mm or more from the side surface; [2] performing a finishing process on the surface to be rolled of the titanium slab in which the layer is formed, to thereby bring a slab flatness index X to 3.0 or less; and [3] subjecting the titanium slab after the finishing process to hot rolling under a condition in which a length of an arc of contact of a roll L in a first pass of rough rolling is 230 mm or more.