Nisshin Steel Co., Ltd.

Other

Nippon Steel Nisshin Co., Ltd.

Nippon Steel Stainless Steel Corporation

Manabu Oku

Yoshiaki Hori

Takeo Tomita

Takeshi Utsunomiya

Sadayuki Nakamura

Kazunari Imakawa

Toshirou Nagoya

Tsutomu Seki

Yoshitomo Fujimura

Yasutoshi Kunitake

Kouichi Kawatani

Atsushi Sugama

Naoto Hiramatsu

Yoshihiro Uematsu

Osamu Yamamoto

Kazuyuki Kageoka

Hiroaki Shichi

Yukihiro Nishida

Naohito Kumano

Yoshihide Naruse

Isamu Hayakawa

A plate-type heat exchanger may include a housing. The housing may include a plurality of rectangular plate-like components that are box-like components each having the same shape and having a standing wall section along a peripheral edge. One of the box-like components may be layered on another components reversed in the horizontal direction to form a layered structure having an upper layer component and a lower layer component such that an upper portion of a standing wall section of the lower layer component of the layered structure is fit into a lower portion of a standing wall section of the upper layer component of the layered structure. The angle (&#x3b8;) of the standing wall sections may be &#x3b8;&#x2264;30&#xb0;, and at least a portion of a contact region between the upper portion and the lower portion may be joined by solid phase diffusion bonding.

Plate-type heat exchanger and method for producing same

To provide a heat resistant metal gasket that is controlled to have a strength level (ordinary temperature hardness) capable of facilitating processing, and has excellent gas leak resistance. An austenitic stainless steel sheet for a metal gasket, having a chemical composition containing from 0.015 to 0.200% of C, from 1.50 to 5.00% of Si, from 0.30 to 2.50% of Mn, from 7.0 to 17.0% of Ni, from 13.0 to 23.0% of Cr, and from 0.005 to 0.250% of N, all in terms of percentage by mass, containing, as necessary, at least one of Mo, Cu, Nb, Ti, V, Zr, W, Co, B, Al, REM (rare-earth element except for Y), Y, Ca and Mg, with the balance of Fe and unavoidable impurities, having an ordinary temperature hardness of 430 HV or less, having a half width of a peak of an austenite crystal (311) plane in an X-ray diffraction pattern of a cross section perpendicular to a sheet thickness direction of from 0.10 to 1.60&#xb0;, and having a surface roughness Ra of 0.30 &#x3bc;mm or less.

Austenitic stainless steel sheet for gasket, and gasket

A method for producing a stainless steel diffusion-bonded product provides a stainless steel material diffusion-bonded product having excellent reliability of the bonded portion by using a direct method, which includes directly contacting stainless steel materials with each other to unify the materials together by diffusion bonding. At least one of the stainless steel materials to be contacted is dual-phase steel having an austenite transformation starting temperature Acpoint of 650 to 950&#xb0; C. during the temperature elevation and having an austenite+ferrite dual-phase temperature region in the range of 880&#xb0; C. or higher. Diffusion bonding is advanced under conditions such that the contact surface pressure is in the range of 1.0 MPa or less and the heating temperature is in the range of from 880 to 1,080&#xb0; C. while being accompanied by the movement of grain boundary caused when the ferrite phase in the dual-phase steel undergoes transformation to an austenite phase.

Method for producing a stainless steel diffusion-bonded product

A ferritic stainless steel material for brazing without grain coarsening has a partially recrystallized structure and composition comprising, in % by mass, C:0.03% or less, Si: more than 0.1 to 3%, Mn: 0.1 to 2%, Cr: 10 to 35%, Nb: 0.2 to 0.8%, N: 0.03% or less, if necessary, at least one of Mo, Cu, V and W: 4% or less in total, at least one of Ti and Zr: 0.5% or less in total, at least one of Ni and Co: 5% or less in total, or at least one of Al: 6% or less, REM (rare earth metal): 0.2% or less and Ca: 0.1% or less, the remainder being Fe and unavoidable impurities, wherein area ratio in percentage of recrystallized grains formed by heating after cold working is from 10 to 80%.

Ferritic stainless steel material for brazing and heat exchanger member

In a turbocharger equipped with a nozzle vane for changing the speed of exhaust gas running through a turbine in accordance with the speed of engine revolution, the member to constitute the nozzle vane and to constitute an exhaust guide for guiding exhaust gas to the turbine is characterized in that the exhaust guide member of a nozzle vane-type turbocharge is formed of an austenite stainless steel containing, in terms of % by mass, at most 0.08% of C, from 2.0 to 4.0% of Si, at most 2.0% of Mn, from 8.0 to 16.0% of Ni, from 18.0 to 20.0% of Cr and at most 0.04% of N and containing these ingredients in such a manner that they satisfy a DE value of the specified formula to be from 5.0 to 12.0, with a balance of Fe and inevitable impurities.

Exhaust guide member of nozzle vane-type turbocharger

A ferritic stainless steel for automobile exhaust gas passage components comprises, in mass percent, C: not more than 0.03%, Si: not more than 1%, Mn: not more than 1.5%, Ni: not more than 0.6%, Cr: 10-20%, Nb: not more than 0.5%, Ti: 0.05-0.3%, Al: more than 0.03% to 0.12%, Cu: more than 1% to 2%, V: not more than 0.2%, N: not more than 0.03%, B: 0.0005-0.02%, O: not more than 0.01%, and the balance of Fe and unavoidable impurities, whose composition satisfies the relationships Nb&#x2267;8 (C+N) and 0.02&#x2266;Al&#x2212;(54/48))&#x2266;0.1. The steel enables fabrication of automobile exhaust gas passage components that are excellent in high-temperature strength and weld toughness, and offers a wide range of freedom in selecting suitable pipe-making conditions.

Ferritic stainless steel for automobile exhaust gas passage components and welded steel pipe

A method of manufacturing a ferritic stainless steel sheet having good workability with less anisotropy. The steps include providing a ferritic stainless steel comprising C up to about 0.03 mass %, N up to about 0.03 mass %, Si up to about 2.0 mass %, Mn up to about 2.0 mass %, Ni up to about 0.6 mass %, Cr about 9&#x2013;35 mass %, Nb about 0.15&#x2013;0.80 mass % and the balance being Fe except inevitable impurities; precipitation-heating said stainless steel at a temperature in a range of 700&#x2013;850&#xb0; C. for a time period not longer than 25 hours; and finish-annealing said stainless steel at a temperature in a range of 900&#x2013;1100&#xb0; C. for a time period not longer than 1 minute.

Ferritic stainless steel sheet having good workability and manufacturing method thereof

A ferritic stainless steel sheet containing 16-25 mass % of Cr and Ti and/or Nb at a ratio of (C&plus;N)&times;8 or more is used as a substrate for formation of a hydrogen-permeating membrane exposed to a high-temperature atmosphere of 600-900&deg; C., while another ferritic stainless steel sheet containing Cr up to 15 mass % is used as a substrate for formation of a hydrogen-permeating membrane exposed to a high-temperature atmosphere of 450-600&deg; C. The stainless steel sheet is formed to a perforated body 3 with holes for passage of gas. A hydrogen-permeating membrane 3 is fixed to on an external surface of the perforated body 3 to build up a hydrogen-separating pipe 3. A plurality of the hydrogen-separators 3 are inserted into a cavity between inner and outer walls of a double-pipe 2 filled with a catalyst 4. Hydrocarbon gas fed through a nozzle 7 is decomposed with combustion heat of a fuel F fed into an inner space of the double-pipe 2. A decomposition product H selectively permeates through the membrane 3 and flows out through the takeout opening 8.

Gas reformer for recovery of hydrogen

Ferritic stainless steel sheet having good workability

The new hydrogen-recovering device has a box-shaped frame made of stainless steel having a takeout pipe attached to its one side. A plurality of spacers are arranged inside the box-shaped frame along a lengthwise direction of the device . A perforated metal plate is fixed to each surface of the box-shaped frame , and a hydrogen-permeating membrane cladded with a membrane holder is further fixed to the perforated metal plate . Hydrogen gas as a decomposition product of hydrocarbon selectively passes through the hydrogen-permeating membrane and flows through the takeout pipe to the outside. A tubular device, which has the structure that a hydrogen-permeable membrane is fixed to a perforated metal plate wound around a tubular frame, is also proposed. The device is light and strong, so that it is installed in a gas-reforming plant without use of a fixing jig.

Device for recovery of hydrogen

Ferritic stainless steel excellent in high temperature oxidation

Growing community of inventors

Shinnanyo, Japan

Manabu Oku