Jfe Steel Corporation

Mitsubishi Denki Kabushiki Kaisha

Masataka Yoshino

Kunio Fukuda

Mitsuyuki Fujisawa

Ayako Ta

Akito Mizutani

Yukihiro Matsubara

Keisuke Nakazono

Yukio Kimura

Shuji Nishida

Hiroshi Yamaguchi

Tomohiro Ishii

Hiroki Ota

Chikara Kami

Reiko Sugihara

Masaru Takada

Hidemoto Arai

Takayoshi Yano

Hiroyuki Ogata

Tetsuyuki Nakamura

Hidetaka Kawabe

Hisao Yokoya

Youichi Sugiyama

Sumio Kaiho

Takao Morisaki

Saiichi Murata

Nobukazu Kitagawa

Kenzou Takahashi

Atsushi Oguri

Hiroyasu Kuwazawa

Masaharu Oohori

Muhammad Febry

Fagang Gao

Keishi Inoue

Yoshiki Hashimoto

Yasunori Ushikosi

Tomatsu Nomaguchi

Nobuyoshi Matsuno

Hiromi Odegawa

Takashi Samukawa

Having a chemical composition (1) containing 0.15 mass % to 1.00 mass % of Nb, and (2) containing 0.0005 mass % to 0.0100 mass % of Mg, where (3) the Al content is controlled in a range of 0.55 mass % to 2.00 mass %, and (4) a relationship of 0.0004≤[Mg]/[Al]≤0.0050 is further satisfied.

Ferritic stainless steel for solid oxide fuel cell

Attached are a marked-up copy of the originally filed specification and a clean substitute specification in accordance with 37 C.F.R. §§ 1.121(b)(3) and 1.125(c). The substitute specification contains no new matter.

Ferritic stainless steel sheet and method for manufacturing the same

A ferritic stainless steel sheet has a predetermined chemical composition and thickness, and has an area ratio of crystal grains of 45 μm or more in grain size of 20% or less.

Ferritic stainless steel sheet and method for producing same

A ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance and a method for manufacturing the same are provided. A ferritic stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities. The elongation after fracture is 28% or more, and the ridging height of a surface of a steel sheet to which a tensile strain of 23% has been applied in a rolling direction is 3.0 &#x3bc;m or less.

Ferritic stainless steel that has excellent formability and ridging resistance and can be produced with high productivity is provided. The ferritic stainless steel has: a predetermined chemical composition; a microstructure containing ferrite crystal grains which satisfy at least one of a C concentration of 2Cor more and an N concentration of 2Cor more, the ferrite crystal grains having a volume fraction with respect to a whole volume of the microstructure of 5% or more and 50% or less, where Cand Care respectively C content and N content in the steel in mass %; and a Vickers hardness of 180 or less.

Ferritic stainless steel and process for producing same

Provided are a material for cold rolled stainless steel sheets having sufficient corrosion resistance, excellent surface quality, excellent formability, and excellent ridging resistance; a method for manufacturing the same; and a cold rolled steel sheet. A material for cold rolled stainless steel sheets according to the present invention contains C: 0.005% to 0.025%, Si: 0.02% to 0.50%, Mn: 0.55% to 1.0%, P: 0.040% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Ni: 0.01% to 1.0%, Al: 0.001% to 0.10%, and N: 0.005% to 0.025% on a mass basis, the remainder being Fe and inevitable impurities, and has a metallographic structure containing 5% to 20% of a martensite phase in terms of volume fraction, the remainder being a ferrite phase.

Material for cold rolled stainless steel sheets, method for manufacturing the same, and cold rolled steel sheet

Provided is a material for a cold-rolled stainless steel sheet having a chemical composition containing, by mass %, C: 0.01% to 0.05%, Si: 0.02% to 0.75%, Mn: 0.1% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 16.0% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06% and the balance being Fe and inevitable impurities. The material has a metallographic structure including a martensite phase having an area ratio of 5% to 50% and the balance being a ferrite phase. A ferrite phase in portions extending from surface layers of front and back surfaces of a steel sheet has an average grain diameter of 20 &#x3bc;m or more and 50 &#x3bc;m or less, and a ferrite phase in a central portion of the sheet includes an unrecrystallized ferrite phase.

Material for cold-rolled stainless steel sheet

Stainless steel that has excellent formability and ridging resistance and can be produced with high productivity is provided. The stainless steel comprises: a chemical composition containing, in mass %, C: 0.005% to 0.050%, Si: 0.01% to 1.00%, Mn: 0.01% to 1.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.5% to 18.0%, Ni: 0.01% to 1.0%, Al: 0.001% to 0.10%, and N: 0.005% to 0.06%, with a balance being Fe and incidental impurities; and a microstructure containing a martensite phase of 1% to 10% in volume fraction with respect to a whole volume of the microstructure.

Stainless steel and production method therefor

Provided is a cold-rolled ferritic stainless steel sheet having a chemical composition that contains, by mass %, C: 0.01% or more and 0.05% or less, Si: 0.02% or more and 0.75% or less, Mn: 0.1% or more and 1.0% or less, P: 0.04% or less, S: 0.01% or less, Al: 0.001% or more and 0.10% or less, N: 0.01% or more and 0.06% or less, Cr: 16.0% or more and 18.0% or less, and the balance being Fe and inevitable impurities. The metallographic structure includes a ferrite phase, in which the average grain diameter is 10 &#x3bc;m or less, in which the proportion of ferrite grains having a grain diameter of 10 &#x3bc;m or more and less than 40 &#x3bc;m is 60% or more, and in which the proportion of ferrite grains having a grain diameter of less than 5 &#x3bc;m is less than 20%.

Cold-rolled ferritic stainless steel sheet

A material for stainless steel cold rolling suitable for producing a cold-rolled stainless steel sheet that has sufficient corrosion resistance and ridging resistance as well as excellent formability and surface properties is provided. The material for stainless steel cold rolling according to the present invention contains, in terms of % by mass, C: 0.007% to 0.05%, Si: 0.02% to 0.50%, Mn: 0.05% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06%, and the balance being Fe and unavoidable impurities, wherein the material has a microstructure that includes 10% to 60% of a martensite phase in terms of area fraction, with the remainder being a ferrite phase, and the martensite phase has a hardness of HV500 or less.

Material for cold-rolled stainless steel sheet and production method therefor

A known heat exchanger has a lower rate of blocking the movement of moisture through the joint as compared to a joint bonded with a moisture impermeable adhesive because the corrugated and flat substrates are bonded with thermoplastic fibers by performing heating and pressurizing treatments, but has insufficient moisture permeability because both the flat substrate, which is a partition, and the corrugated substrate, which is a space retaining plate, have a poor moisture permeability. In a heat exchanger in which two types of air flows are directed across a moisture permeable partition plate spaced apart from an adjacent partition plate by a space retaining plate, and perform heat exchange between them through the partition plate, a joint is formed by bonding the partition plate and the space retaining plate using fluoro-resin or hydrocarbon resin containing a hydrophilic group to provide an excellent moisture absorption and diffusion property.

Heat exchanger

A garbage disposer includes a pulverizing unit, adapted to communicate with a basin of a sink through a drain hole of the basin, for pulverizing the garbage charged through the drain hole together with water, a straining unit, connected to the pulverizing unit through a transporting mechanism, the straining unit including a straining casing, a straining drum, supported within the straining casing for rotation about a horizontal axis, and a motor for rotating the straining drum, the straining drum having a circumferential face with a multiplicity of perforations formed therethrough for straining out the garbage pulverized in the pulverizing unit.

Garbage disposer

A ventilation device including a heat exchanger having thermosensitive elements each placed, respectively at the inlet of an air-feeding passage, the inlet of an air-discharging passage and the outlet of the air-feeding passage and a display unit for showing temperature detected by the respective thermosensitive elements.

Ventilation device

A vaporizer and burner unit for an oil or kerosene space heater comprises three elongated, vertically stacked fuel mixture flow chambers A, B and C respectively defined between a lower U-shaped frame member 19b and the sloping bottom wall 26 of a flanged, upper U-shaped frame member 19a nested on the lower member, between the wall 26 and an inverted V-shaped pressure plate 27 having a plurality of fuel mixture feed holes 28 therein, and between the plate 27 and a burner plate 30 having a plurality of flame slits 31 therein. Fuel is fed into one end of the chamber A onto a heated vaporizer block 21, and combustion air blown in through a side window 24 adjacent the block and through a concentric gap 25 around the fuel supply line 12 mixes with the vaporized fuel and flows down chamber A and into chamber B through an end opening 29. The mixture then disperses through the holes 28 into chamber C and through the flame slits 31 to a spark igniter 62. Secondary combustion air is blown up through holes 32 in the upper frame member flanges and funneled into the flames by converging guide plates 33 mounted on the flanges. The zig-zag flow chamber arrangement implements thorough fuel-air mixture and preheating, and the holes 28 and 32 are staggered with respect to the slits 31 to promote uniform and complete combustion.

Fuel vaporizer and burner unit for space heater

A static heat-and-moisture exchanger core comprises an enclosed shell structure having a plurality of heat-and-moisture transfer members statically disposed therein in superposed and spaced-apart relationship defining between each two adjacent members a static flow path. The shell structure has a box-shaped configuration having four side walls and contains numerous pairs of aligned openings in opposed side wall portions each pair opening into one of the flow paths. Each heat-and-moisture transfer member is composed of either Japanese paper or asbestos paper having a thickness of from 0.05 mm to 1.0 mm whereupon the laminations are heat conductive and moisture permeable to effect continuous and simultaneous heat and moisture exchange between two air streams flowing through alternate ones of the flow paths.

Growing community of inventors

Tokyo, Japan

Masataka Yoshino