Nippon Steel Corporation

Tomoyuki Kitaura

Hideki Fujii

Yoshihisa Shirai

Kenichi Mori

Kazuhiro Takahashi

Akira Kawakami

Tomonori Kunieda

Yoshitsugu Tatsuzawa

Koji Mitsuda

Provided is a titanium composite materialincluding: a first surface layer portion; an inner layer portion; and a second surface layer portion; wherein: the first surface layer portionand the second surface layer portionare composed of a titanium alloy; the inner layer portionis composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portionand the second surface layer portionis 2 &#x3bc;m or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite materialis 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.

Titanium material for hot working

A titanium product includes an inner layer portion and a surface layer portion joined to the inner layer portion. The surface layer portion has a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: 0.020% or less, the balance: Ti and impurities. The inner layer portionhas pores and a composition consisting of, by mass %, O: 0.4% or less, Fe: 0.5% or less, Cl: more than 0.020% and 0.60%, the balance: Ti and impurities. The area fraction of the pores in the inner layer portion in a cross-section perpendicular to the longitudinal direction of the titanium product is more than 0% and not more than 30%. The Cl content (Cl) of the inner layer portion, a thickness (t) of the surface layer portion, and a thickness (t) of the inner layer portion satisfy the expression [Cl&#x2264;0.03+0.02&#xd7;t/t].

Titanium product and method for producing the same

Titanium composite material and titanium material for hot working

A titanium-containing structure made of a titanium material includes: a package made of a commercially pure titanium material; and a filler packed into the package, wherein an internal pressure of the package is 10 Pa or less, the pressure being an absolute pressure, and wherein the filler includes at least one selected from titanium sponge, titanium briquette, and titanium scrap, and the filler has the same type of a chemical composition of the commercially pure titanium material. This titanium-containing structure enables production of a titanium product by performing hot working and eliminating the conventional melting step and forging step.

Titanium-containing structure and titanium product

A titanium composite materialis provided that includes: an inner layerconsisting of a commercially pure titanium or a titanium alloy; an outer layerformed on at least one surface of the inner layerand having a chemical composition that is different from a chemical composition of the inner layer; and an intermediate layer formed between the inner layerand the outer layerand having a chemical composition that is different from the chemical composition of the inner layer. The thickness of the outer layeris 2 &#x3bc;m or more, and occupies no more than 40% of the overall thickness per side. The thickness of the intermediate layer is 0.5 &#x3bc;m or more. Despite being inexpensive, this titanium composite material has desired characteristics.

Titanium composite material and titanium material for hot rolling

Provided is an &#x3b1;+&#x3b2; titanium alloy hot-rolled sheet consisting of, in mass %, Al: 4.7 to 5.5%, Fe: 0.5 to 1.4%, N: less than or equal to 0.03%, Si: 0.15 to 0.40%, a ratio of Si/O: 0.80 to 2.80, [O]in Expression (1): more than or equal to 0.13% and less than 0.25%, and the balance: Ti and impurities. In a case where an ND direction represents a normal direction of the hot-rolled sheet, a TD direction represents a sheet-width direction of the hot-rolled sheet, a c-axis orientation represents a normal direction of a (0001) plane in an &#x3b1; phase, XND represents a strongest intensity among X-ray (0002) reflection relative intensities of crystal grains in which the c-axis orientation is in a range of 30&#xb0; from the ND direction, and XTD represents a strongest intensity among intensities in which the c-axis orientation is in a range of &#xb1;10 degrees in the TD direction, XTD/XND is more than or equal to 4.0, a Young's modulus in the sheet-width direction is more than or equal to 135 GPa, and tensile strength in the sheet-width direction is more than or equal to 1100 MPa,[=[]+2.77[&#x2003;&#x2003;Expression (1).

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Tokyo, Japan

Tomoyuki Kitaura