Sumitomo Metal Industries, Inc.

Nippon Steel & Sumikin Stainless Steel Corporation

Toyota Jidosha Kabushiki Kaisha

Osaka Titanium Technologies Co., Ltd.

Nippon Steel Stainless Steel Corporation

Haruhiko Kajimura

Nobuhiko Hiraide

Junichi Hamada

Hiroo Nagano

Yoshiharu Inoue

Ken Kimura

Toshio Tanoue

Minoru Miura

Masao Kikuchi

Eiichiro Ishimaru

Masayuki Sagara

Yoichi Yamamoto

Shinji Tsuge

Yasuhiro Masaki

Kiyoko Takeda

Naoto Ono

Tadashi Ogasawara

Yuusuke Oikawa

Mitsuo Miyahara

Shigeki Azuma

Kazuo Yamanaka

Shigeru Maeda

Fumio Fudanoki

Munetoshi Watanabe

Hiroshi Urashima

Katsuhiro Nishihara

Tsuyoshi Kodama

Daiharu Doi

Katsumi Okada

Michiyasu Takahashi

Tadashi Yao

Shiji Shimosaki

Kazuhiko Ishida

Kouji Oda

Sadanobu Nagaoka

Yasuhisa Tanaka

Yosuke Sumi

Toshio Kojima

This alloying element-saving hot rolled duplex stainless steel material contains, by mass %, C: 0.03% or less, Si: 0.05% to 1.0%, Mn: 0.5% to 7.0%, P: 0.05% or less, S: 0.010% or less, Ni: 0.1% to 5.0%, Cr: 18.0% to 25.0%, N: 0.05% to 0.30% and Al: 0.001% to 0.05%, with a remainder being Fe and inevitable impurities, wherein the alloying element-saving hot rolled duplex stainless steel material is produced by hot rolling, a chromium nitride precipitation temperature TN is in a range of 960&#xb0; C. or lower, a yield strength is 50 MPa or more higher than that of a hot rolled steel material which is subjected to a solution heat treatment, and the alloying element-saving hot rolled duplex stainless steel material is as hot rolled state, and is not subjected to a solution heat treatment. This clad steel plate includes a duplex stainless steel as a cladding material, the duplex stainless steel has the above composition, and the chromium nitride precipitation temperature TN is in a range of 800&#xb0; C. to 970&#xb0; C.

Alloying element-saving hot rolled duplex stainless steel material, clad steel plate having duplex stainless steel as cladding material therefor, and production method for same

The stainless steel of the first embodiment includes C: 0.001 to 0.02%, N: 0.001 to 0.02%, Si: 0.01 to 0.5%, Mn: 0.05 to 0.5%, P: 0.04% or less, S: 0.01% or less, Ni: more than 3% to 5%, Cr: 11 to 26%, and either one or both of Ti: 0.01 to 0.5% and Nb: 0.02 to 0.6%, and contains as the remainder, Fe and unavoidable impurities. The stainless steel of the second embodiment has an alloy composition different from those of the first and third embodiments and satisfies the formula (A): Cr+3Mo+6Ni&#x2267;23 and formula (B): Al/Nb&#x2267;10 and contains as the remainder, Fe and unavoidable impurities. The stainless steel of the third embodiment has an alloy composition different from those of the first and second embodiments and includes either one or both of Sn: 0.005 to 2% and Sb: 0.005 to 1% and contains as the remainder, Fe and unavoidable impurities.

Stainless steel excellent in corrosion resistance, ferritic stainless steel excellent in resistance to crevice corrosion and formability, and ferritic stainless steel excellent in resistance to crevice corrosion

This stainless steel sheet includes, in terms of mass %, C: 0.001 to 0.1%, N: 0.01 to 0.15%, Si: 0.01 to 2%, Mn: 0.1 to 10%, P: 0.05% or less, S: 0.01% or less, Ni: 0.5 to 5%, Cr: 10 to 25%, and Cu: 0.5 to 5%, with a remainder being Fe and unavoidable impurities, and contains a ferrite phase as a main phase and 10% or more of an austenite phase, wherein a work-hardening rate in a strain range of up to 30% is 1000 MPa or more which is measured by a static tensile testing and a difference between static and dynamic stresses which occur when 10% of deformation is caused is 150 MPa or more. This method for producing a stainless steel includes annealing a cold-rolled steel sheet under conditions where a holding temperature is set to be in a range of 950 to 1150&#xb0; C. and a cooling rate until 400&#xb0; C. is set to be in a range of 3&#xb0; C./sec or higher.

Ferrite-austenite stainless steel sheet for structural component excellent in workability and impact-absorbing property and method for producing the same

The invention provides structural component for an automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability, and method for producing the same, which structural component has a hat-like shape including vertical walls and flanges, wherein distal ends of the flanges contain 20 vol % or greater of austenite phase and have a cross-section hardness expressed as Vickers harness of 150&#x2dc;350, and a center regions of the vertical walls have, in a common cross-section with the flanges, a content of deformation-induced martensite phase exceeding that of the distal ends of the flanges by 10 vol % or greater and a cross-section hardness expressed as Vickers hardness that exceeds that of the distal ends of the flanges by 50 or greater.

Structural component for automobile, two-wheeled vehicle or railcar excellent in impact-absorption property, shape fixability and flange cuttability, and method for producing the same

The present invention provides, as a material superior in heat resistance in a hot environment where the maximum temperature of the exhaust gas becomes 750 to 900&#xb0; C., ferritic stainless steel sheet superior in heat resistance in a broad temperature region of 750 to 900&#xb0; C. with long term stability by a smaller amount of addition of Mo than SUS444 containing about 2% of expensive Mo, that is, ferritic stainless steel sheet superior in heat resistance characterized by containing, by mass %, C: 0.01% or less, N: 0.02% or less, Si: 0.05 to 1%, Mn: 0.1 to 2%, Cr: 10 to 30%, Mo: 0.1 to 1%, Cu: 1 to 2%, Nb: 0.2 to 0.7%, Ti: 0.01 to 0.3%, and B: 0.0002 to 0.0050%, having a balance of Fe and unavoidable impurities, and having a 0.2% yield strength at 750&#xb0; C. of 70 MPa or more.

Ferritic stainless steel sheet superior in heat resistance

Titanium oxide-based photocatalysts which contain a metal halide in titanium oxide and which are prepared from titanium oxide and/or its precursor, which may optionally be heat treated, by contact with a reactive gas containing a metal halide of the formula MXor MOX(wherein M=a metal, X=a halogen, and n=an integer) with heating stably develop a high photocatalytic activity with visible light irradiation. The photocatalysts may subsequently be stabilized by contact with water or by heat treatment, and/or promoted by contact with a heteropoly acid and/or an isopoly acid so as to include a metal complex in the titanium oxide. Photocatalysts prepared in this manner exhibit novel ESR features. The present invention also provides methods for preparing these photocatalysts, a photocatalyst dispersion and a photocatalytic coating fluid containing such a photocatalyst, and photocatalytic functional products and methods for their manufacture using the photocatalyst.

Titanium oxide photocatalyst, process for producing the same and application

A ferrite stainless steel for an automobile exhaust system member superior in thermal fatigue strength comprised of, by wt %, C: 0.020% or less, Si: 0.02 to 0.15%, Mn: 0.05 to 0.20%, P: 0.040% or less, S: 0.010% or less, Al: 0.005 to 0.10%, N: 0.020% or less, Cr: 15 to 18%, Mo: 1.5 to 2.0%, Ti: 3&#xd7;(C+N) to 0.25%, Nb: 0.4 to 0.8%, B: 0.0003 to 0.0050%, the C and N satisfying the relationship of C+N: 0.030% or less, and the Al, Si, and Mn satisfying the relationship of Al&#xd7;(Si+Mn): 0.001 to 0.020, and a balance of Fe and unavoidable impurities. The 0.2% proof stress at 900&#xb0; C. before heat treatment in the atmosphere at 900&#xb0; C. for 300 hours is at least 15 MPa, and a difference of the 0.2% proof stress before and after the heat treatment is not more than 5 MPa.

Ferrite stainless steel for automobile exhaust system member superior in thermal fatigue strength

An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2);16.9+6.9Ni+12.5Cu&#x2212;1.3Cr+3.2Mn+9.3Mo&#x2212;205C&#x2212;38.5N&#x2212;6.5Si&#x2212;120Nb&#x2267;40&#x2003;&#x2003;(1)450&#x2212;440(C+N)&#x2212;12.2Si&#x2212;9.5Mn&#x2212;13.5Cr&#x2212;20(Cu+Ni)&#x2212;18.5Mo&#x2266;&#x2212;90&#x2003;&#x2003;(2)8.2+30(C+N)+0.5Mn+Ni&#x2212;1.1(1.5Si+Cr+Mo)+2.5Nb&#x2266;&#x2212;0.8&#x2003;&#x2003;(3)

Austenitic stainless steel

An austenitic stainless steel of the present invention has the following chemical composition based on percent by weight: C: 0.05% or less, Si: 1.0% or less, Mn: 2.0% or less, P: 0.04% or less, S: 0.01% or less, Ni: from 12 to 27%, Cr: from 15 to 26%, Cu: over 3.0 to 8.0%, Mo: over 2.0 to 5.0%, Nb: 1.0% or less, Ti: 0.5% or less, W: 5.0% or less, Zr: 1.0% or less, Al: 0.5% or less, N: under 0.05%, Ca: 0.01% or less, B: 0.01% or less, rare earth elements: 0.01% or less in total, and the balance Fe and unavoidable impurities. The austenitic stainless steel has excellent sulfuric acid corrosion resistance and excellent workability.

Austenitic stainless steel having excellent sulfuric acid corrosion resistance and excellent workability

The ferritic stainless steel of the present invention contain the following main chemical elements, in which a relationship between B and Gd, preferably, satisfies the following equation (1) on the weight % basis:

Stainless steel having excellent thermal neutron absorption ability

A zirconium alloy which has good creep strength and bending properties as well as improved corrosion resistance in nitric acid solutions of low, medium, and high concentrations and which can withstand stress corrosion cracking in highly concentrated nitric acid solutions even under a high anodic potential is disclosed. The zirconium alloy consists essentially of, by weight percent:

Zirconium-titanium and/or tantalum oxygen alloy

An austenitic stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:

Austenitic stainless steel with improved resistance to corrosion by

A dual-phase stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:

Dual-phase stainless steel with improved resistance to corrosion by

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Hikari, Japan

Haruhiko Kajimura