Abstract: A titanium material including a base metal made of pure titanium or a titanium alloy and a titanium oxide film formed on the base metal. Peak intensities obtained by thin-film X-ray diffraction analysis performed on an outer layer of the titanium material using an incident angle of 0.3° satisfy (I(104)+I(200))/I(101)?0.08?0.004×I(200), where I(104) is the peak intensity resulting from a plane (104) of a Ti2O3 phase, I(200) is the peak intensity resulting from a plane (200) of a TiO phase, I(101) is the peak intensity resulting from a plane (101) of an ?-Ti phase, and 0<I(104), 0?I(200), and 0<I(101). The titanium material is inexpensive and has both the electrical conductivity and corrosion resistance.

Abstract: Provided are a stainless steel sheet with good corrosion resistance, low contact resistance and good press workability without the use of expensive materials such as gold or rare metals, and a method of manufacture the same. A method of manufacturing a stainless steel sheet includes: preparing a slab having a chemical composition including, in mass %: 20 to 26% Cr, up to 0.1% N, up to 2.0% Si, etc. (step S1); performing hot rolling and cold rolling on the slab to produce a rolled steel sheet with a thickness of 50 to 200 ?m (step S2); an annealing step in which the rolled steel sheet is annealed and cooled in a gas atmosphere containing nitrogen (step S3); and pickling the rolled steel sheet after the annealing step with a solution containing a non-oxidizing acid (step S4). The stainless steel sheet has an N content of 0.6 to 2.0% by mass.

Abstract: A coated titanium material includes a titanium material and a coating film formed on a surface of the titanium material. A Ti-based oxide is included in an interface between the titanium material and the coating film. The Ti-based oxide is one or both rutile type TiO2 and Ti2O3. In a case where a cut surface of the coating film is formed by using a SAICAS method under conditions that a horizontal speed is 2 ?m/s and a vertical speed is 0.1 ?m/s, on the cut surface, an area percentage of the Ti-based oxide is 30.0% or more in a region having a distance of 15 ?m from a reference line specified on the basis of a boundary line, which is an intersection line between the cut surface and the interface, to a coating film side.

Abstract: A titanium material includes a base material made of pure titanium or a titanium alloy; and a carbon layer covering a surface of the base material. The carbon layer includes non-graphitizable carbon, and has an R value (I1350/I1590) of 2.0 or more and 3.5 or less in the Raman spectroscopy using laser having a wavelength of 532 nm. Where I1350 is peak intensity at a wave number of around 1.35×105 m?1 in a Raman spectrum, and I1590 is peak intensity at a wave number of around 1.59×105 m?1 in a Raman spectrum. According to this titanium material, it is possible to realize low contact resistance by the carbon layer. Moreover, this titanium material is not susceptible to surface oxidation and capable of maintaining low contact resistance even when exposed to noble potential.

Abstract: Provided is a stainless steel product having a chemical composition consisting of C: less than 0.05%, Si: 4.0 to 7.0%, Mn: 1.50% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 20.0%, Ni: 11.0 to 17.0%, Cu: 0.15 to 1.5%, Mo: 0.15 to 1.5%, Nb: 0.5 to 1.2%, Sol. Al: 0 to 0.10%, Mg: 0 to 0.01%, and balance Fe and impurities, wherein MgO.Al2O3 inclusions constitute an area fraction of 0.02% or less. This stainless steel product has excellent corrosion resistance to hot concentrated sulfuric acid of approximately 93 to 99% concentration, for example, and also is economically advantageous.

Abstract: Provided are a stainless steel sheet with good corrosion resistance, low contact resistance and good press workability without the use of expensive materials such as gold or rare metals, and a method of manufacture the same. A method of manufacturing a stainless steel sheet includes: preparing a slab having a chemical composition including, in mass %: 20 to 26% Cr, up to 0.1% N, up to 2.0% Si, etc. (step S1); performing hot rolling and cold rolling on the slab to produce a rolled steel sheet with a thickness of 50 to 200 ?m (step S2); an annealing step in which the rolled steel sheet is annealed and cooled in a gas atmosphere containing nitrogen (step S3); and pickling the rolled steel sheet after the annealing step with a solution containing a non-oxidizing acid (step S4). The stainless steel sheet has an N content of 0.6 to 2.0% by mass.

Abstract: A titanium material including a base metal made of pure titanium or a titanium alloy and a titanium oxide film formed on the base metal. Peak intensities obtained by thin-film X-ray diffraction analysis performed on an outer layer of the titanium material using an incident angle of 0.3° satisfy (I(104)+I(200))/I(101)?0.08?0.004×I(200), where I(104) is the peak intensity resulting from a plane (104) of a Ti2O3 phase, I(200) is the peak intensity resulting from a plane (200) of a TiO phase, I(101) is the peak intensity resulting from a plane (101) of an ?-Ti phase, and 0<I(104), 0?I(200), and 0<I(101). The titanium material is inexpensive and has both the electrical conductivity and corrosion resistance.

Abstract: A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of TiO2 of a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of TiOx (1<x<2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.

Abstract: A titanium alloy including by mass %, a platinum group metal: 0.01 to 0.15% and a rare earth metal: 0.001 to 0.10%, with the balance being Ti and impurities. The titanium alloy preferably includes as a partial replacement for Ti, Co: 0.05 to 1.00% by mass, and the content of the platinum group metal is preferably in the range of 0.01 to 0.05% by mass. Furthermore, it is preferred that the platinum group metal be Pd and the rare earth metal be Y. Consequently, it is possible to provide a titanium alloy having corrosion resistance comparable to or better than that of the conventional art as well as good workability while offering an economic advantage with a lower content of platinum group metal or an advantage of less likelihood of corrosion growth originating at defects such as flaws that occurred in the surface.

Abstract: This titanium product includes a base metal, and a complex oxide film formed on the surface of the base metal. The base metal has a chemical composition consisting of, by mass %, platinum group elements: 0 to 0.15%, rare earth elements: 0 to 0.1%, and a balance: Ti and impurities. The complex oxide film contains a complex oxide of Ti and one or more elements selected from La, Ce, Nd, Sr and Ca, and has a thickness of 1 to 20 nm. The average grain size at the base metal surface is preferably from 20 to 300 ?m.

Abstract: Provided is a stainless steel product having a chemical composition consisting of C: less than 0.05%, Si: 4.0 to 7.0%, Mn: 1.50% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 20.0%, Ni: 11.0 to 17.0%, Cu: 0.15 to 1.5%, Mo: 0.15 to 1.5%, Nb: 0.5 to 1.2%, Sol. Al: 0 to 0.10%, Mg: 0 to 0.01%, and balance Fe and impurities, wherein MgO.Al2O3 inclusions constitute an area fraction of 0.02% or less. This stainless steel product has excellent corrosion resistance to hot concentrated sulfuric acid of approximately 93 to 99% concentration, for example, and also is economically advantageous.

Abstract: There is provided a titanium product for a separator of a polymer electrolyte fuel cell (PEFC). The titanium product includes a substrate made of a titanium or a titanium alloy, and a passivation film formed on a surface of the substrate, wherein the passivation film includes a Li-containing titanium oxide layer in its surface layer. This titanium product can keep a low contact resistance with an electrode film and is inexpensive.

Abstract: The clad material comprises outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, and is characterized in that peeling-off at a clad boundary is not recognized in cross section observation made after the clad material has been subjected to a 90° reverse bend test ten times, and the number of reverse bend cycles before rupture is 17 cycles or more. The clad material has with both of excellent corrosion resistance against electrolytic solution and high electric conductivity.

Abstract: A titanium material for a polymer electrolyte fuel cell separator consists of, by mass %, a platinum group metal: 0.005% to 0.15% and a rare earth metal: 0.002% to 0.10%, with the balance being Ti and impurities. The titanium material of the present invention is provided with a film formed of a titanium oxide and a platinum group metal on the surface thereof. It is preferred that the film has a thickness of 50 nm or less, and that the concentration of the platinum group metal on the surface of the film is 1.5% by mass or more. With the thus formed film, the titanium material of the present invention is capable of achieving a reduction in initial contact resistance and ensuring good corrosion resistance. In the titanium material of the present invention, the rare earth metal is preferably Y, and the platinum group metal is preferably Pd.

Abstract: A titanium alloy contains 0.01 to 0.15% by mass of at least one of platinum group elements in total, and the balance being titanium, oxygen, and impurities, wherein, the titanium alloy includes particles of a compound that is made up of at least one of the platinum group elements, titanium, and oxygen, an average size of the particles on a surface of the titanium alloy is 1 ?m or smaller, and a number density of the particles on the surface of the titanium alloy is 25/1000 ?m2 or more. This titanium alloy has a high corrosion resistance and capable of keeping a low contact resistance in comparison with conventional titanium alloys having an equivalent platinum group element content.

Abstract: A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of TiO2 of a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of TiOx (1<x<2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.

Abstract: A duplex stainless steel is provided that has a chemical composition comprising, by mass %, C: 0.03% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.04% or less, S: 0.01% or less, Cu: 0.1 to 1.0%, Ni: 5.0 to 7.5%, Cr: 22.0 to 26.0%, W: 6.0 to 12.0%, N: 0.20 to 0.32%, Mo: 0.01% or less, and a balance: Fe and impurities, in which a metal micro-structure contains, by area ratio, 0.40 to 0.60 of an ?-phase, with a balance being a ?-phase and 0.01 or less of other phases.

Abstract: A stainless steel member for a separator of a solid polymer fuel cell has excellent cell properties with little deterioration in performance over long periods of operation without worsening of the corrosion resistance of a stainless steel separator. The stainless steel member has a stainless steel base metal, and a passive film and electrically conductive precipitates both provided on a surface of the stainless steel base metal. The electrically conductive precipitate penetrates the passive film and includes a substance originating from the stainless steel base metal. An electrically conductive layer comprising a nonmetallic electrically conductive substance is preferably provided on the surface of the passive film, and the electrically conductive layer is preferably electrically connected to the stainless steel base member through the electrically conductive precipitates.

Abstract: A basket-type anode stores plating pellets in a plating bath and is used for electrolytic plating of a steel strip. The basket-type anode comprises a reticulated member made of Ti to be placed facing the steel strip. The reticulated member contains one or more platinum group elements. When the reticulated member contains one or more platinum group elements, the corrosion of the reticulated member can be prevented, and the lifetime of the reticulated member can be improved.

Abstract: A stainless steel member comprising a stainless steel base metal; an oxide film located on the surface of the stainless steel base metal; an electroconductive layer located on the surface of the oxide film and comprising a nonmetallic electroconductive material; and an electroconductive material which is located so as to penetrate the oxide film and which electrically contacts the stainless steel base metal and the electroconductive layer is provided as a stainless steel member for a separator of a solid polymer fuel cell having excellent properties such that a degradation in performance is low even after prolonged operation. A solid polymer fuel cell using the stainless steel member is also provided.