Nippon Steel & Sumikin Stainless Steel Corporation

Nippon Steel Stainless Steel Corporation

Mitsubishi Denki Kabushiki Kaisha

Konica Corporation

Konica Minolta Business Technologies, Inc.

Konica Minolta, Inc.

Nippon Steel Corporation

Nippon Steel & Sumkin Stainless Steel Corporation

Junichi Hamada

Yoshiharu Inoue

Ken Kimura

Norihiro Kanno

Atsutaka Hayashi

Masatoshi Abe

Toshio Tanoue

Nobuhiko Hiraide

Tetsuo Sugano

Naoto Ono

Katsushi Shimamoto

Kimitoshi Hongoh

Keiichiro Shirakashi

Noboru Arikane

Isamu Okugawa

Masahiro Onodera

Eiichiro Ishimaru

Shinichi Teraoka

Akihiko Takahashi

Haruhiko Kajimura

Fumio Fudanoki

Masaaki Kobayashi

Hiroshi Fuma

Takashi Morohoshi

Mitsugu Nemoto

Tadashi Komori

Toyohiko Kakihara

Atsuhisa Yakawa

Jun Takahashi

Shigeyuki Gotoh

Yoshihito Yamada

Satoshi Hashimoto

Yukiko Omori

Yuuji Koyama

Koji Ito

Kazuhiko Sato

Satoshi Nishida

Kyosuke Yoshimoto

Hisayoshi Nagase

Masao Kikuchi

Jun Araki

Shuji Yamamoto

Yoshio Yamazaki

Kiyoyasu Maruyama

Junichi Koiso

Hidetoshi Katayanagi

Hiroshi Funabiki

Haruo Iwahashi

Tomonori Ohashi

Norishige Emoto

Atsushi Ogane

Kiyoaki Kawamoto

Satoshi Akamatsu

Tetsuko Omoto

Kazuhiko Uneme

Shigeo Fukumoto

Yoichi Masubuchi

Masayuki Tendo

Yuji Koyama

Tomoo Kudo

Tetsuya Sigeeda

Takanori Murakami

Kou Nishimura

Yasushi Koshimura

Toshiya Sato

Sachie Matsudaira

Akihito Yamagishi

Naoto Hansaki

Shigeru Kaneko

Mitsuhiro Fujinaga

Chikako Takushima

Nozomu Fukuda

Koh Nishimura

Daiharu Doi

Toshio Kojima

The present invention has as its technical problem to prevent cracking when producing a steel sheet by ferritic stainless steel sheet and provide a ferritic stainless steel sheet excellent in toughness and a part using the same. To solve this technical problem, the present invention provides steel comprised of, by mass %, C: 0.001 to 0.030%, Si: 0.01 to 1.00%, Mn: 0.01 to 1.00%, P: 0.010 to 0.050%, S: 0.0002 to 0.0100%, Cr: 10.0 to 20.0%, N: 0.001 to 0.030%, Nb: 0.10 to 0.40%, B: 0.0002 to 0.0030%, Al: 0.005 to 0.100%, and a balance of Fe and unavoidable impurities in which the amount of solute Nb being less than or equal to a smaller value of 0.20 and (Nb content-0.08) mass %.

Ferritic stainless steel sheet, method for producing the same, and part

A ferritic stainless steel sheet is provided that has a chemical composition consisting of, in mass %, C: 0.001 to 0.020%, Si: 0.02 to 1.50%, Mn: 0.02 to 1.50%, P: 0.01 to 0.05%, S: 0.0001 to 0.01%, Cr: 10.0 to 25.0%, Ti: 0.01 to 0.30%, N: 0.001 to 0.030%, and optional elements, with the balance being Fe and unavoidable impurities, wherein: a grain size number is 6 or more; the ferritic stainless steel sheet satisfies the formulas [A+B&#x2265;12.0/t], [X+Y&#x2265;12.0/(t&#x2212;0.3)] and [(X+Y)&#x2212;(A+B)&#x2264;5.0] with respect to crystal orientation intensities of a ferrite phase obtained by X-ray diffraction; and the sheet thickness is 1.0 mm or more.

Ferritic stainless steel sheet and production method thereof, and ferritic stainless member

A ferritic stainless steel sheet and a steel pipe as a material suitable for a heat-resistant component that is required to have especially excellent formability are provided. The ferritic stainless steel sheet contains 10 to 20 mass % of Cr and a predetermined amount of C, Si, Mn, P, S, Al and one or both of Ti and Nb, a {111}-orientation intensity being 5 or more and {411}-orientation intensity being less than 3 at a portion in the vicinity of a sheet-thickness central portion of the ferritic stainless steel sheet. Further, with similar composition and by setting {111}&#x3c;110&#x3e;-orientation intensity at 4.0 or more and {311}&#x3c;136&#x3e;-orientation intensity at less than 3.0, a relationship r&#x2265;&#x2212;1.0t+3.0 (t(mm): sheet thickness, r: average r-value) is satisfied, thereby providing a ferritic stainless steel sheet and a steel pipe with excellent formability.

Ferrite-based stainless steel plate, steel pipe, and production method therefor

This ferritic stainless steel includes: in terms of % by mass, C: 0.001% to 0.100%; Si: 0.01% to 5.00%; Mn: 0.01% to 2.00%; P: 0.050% or less; S: 0.0100% or less; Cr: 9.0% to 25.0%; Ti: 0.001% to 1.00%; Al: 0.001% to 5.000%; and N: 0.001% to 0.050%, with a balance being Fe and impurities, wherein in a region from a steel surface to a depth of 5 nm, and not exceeding a thickness of a passive film, a total amount of Al and Si is 1.0 atomic % or more, an amount of Cr is 10.0 atomic % or more, and an amount of Fe is 85.0 atomic % or less, in terms of cation fraction.

Ferritic stainless steel having excellent salt corrosion resistance

This ferritic stainless steel sheet contains, by mass %: C: 0.001% to 0.020%; Si: 0.01% to 4.00%; Mn: 0.01% to 3.00%; P: 0.010% to 0.040%; S: 0.0001% to 0.0100%; Cr: 10.0% to 15.0%; N: 0.001% to 0.020%; Al: 0.50% to 10.0%; and either one or both of Ti: 0.05% to 0.40% and Nb: 0.05% to 0.40%, with the balance being Fe and unavoidable impurities, in which Cr/(Si+Al) is 10.0 or less, and a specific gravity is 7.6 g/cmor less.

Ferrite-based stainless steel sheet having low specific gravity and production method therefor

This ferritic stainless steel pipe contains, by mass %: C: 0.001% to 0.100%; Si: 0.01% to 2.00%; Mn: 0.01% to 2.00%; P: 0.001% to 0.05%; S: 0.0001% to 0.005%; Cr: 10.5% to 20.0%; Sn: 0.001% to 0.600%; Ti: 0.001% to 1.000%; Al: 0.001% to 0.100%; and N: 0.001% to 0.02%, with a balance being Fe and unavoidable impurities, the ferritic stainless steel pipe includes a pipe-end-thickened portion at a pipe end portion, and a gap distance d (&#x3bc;m) formed at the pipe end portion satisfies a relationship of d&#x2265;Cr/(1000Sn) (in the expression, Cr and Sn represent amounts (mass %) of respective elements).

Ferritic stainless steel pipe having excellent salt tolerance in gap, pipe-end-thickened structure, welding joint, and welded structure

The present invention particularly has as its technical problem to provide austenitic stainless steel sheet used as the material for housings of turbochargers in which excellent heat resistance and workability are demanded. The austenitic stainless steel sheet according to the present invention comprises, by mass %, C: 0.005 to 0.2%, Si: 0.1 to 4%, Mn: 0.1 to 10%, Ni: 2 to 25%, Cr: 15 to 30%, N: 0.01 to less than 0.4%, Al: 0.001 to 1%, Cu: 0.05 to 4%, Mo: 0.02 to 3%, V: 0.02 to 1%, P: 0.05% or less, and S: 0.01% or less, comprises a balance of Fe and unavoidable impurities, and has an annealing twin frequency of 40% or more and is excellent in heat resistance.

Austenitic stainless steel sheet for exhaust component having excellent heat resistance and workability, turbocharger component, and method for producing austenitic stainless steel sheet for exhaust component

A steel material contains, in mass %, C: 0.005 to 0.050, N: 0.05 to 0.30, Si: 0.1 to 1.5, Mn: 0.1 to 7.0, P: 0.005 to 0.100, S: 0.0001 to 0.0200, Cr: 18.0 to 28.0, Cu: 0.1 to 3.0, Ni: 0.1 to 8.0, Mo: 0.1 to 5.0, Al: 0.001 to 0.050, B: 0.0001 to 0.0200, and Ca: 0.0001 to 0.0100. An area ratio of an austenitic phase ranges from 30% to 70% and formulae (I) and (II) below are satisfied.1.03&#x2264;[% Cr*F]/[% Cr]&#x2264;1.40&#x2003;&#x2003;Formula (I)1.05&#x2264;[% Mn*A]/[% Mn]&#x2264;1.80&#x2003;&#x2003;Formula (II)[% symbol of an element]: a content of the element in the steel[% symbol of an element*F]: a content of the element in a ferrite phase[% symbol of element*A]: a content of the element in the austenitic phase

Ferritic-austenitic two-phase stainless steel material and method for manufacturing same

This ferritic stainless steel contains, by mass %, C: 0.001% to 0.030%; Si: 0.01% to 1.00%. Mn: 0.01% to 2.00%, P: 0.050% or less, S: 0.0100% or less, Cr: 11.0% to 30.0%, Mo: 0.01% to 3.00%, Ti: 0.001% to 0.050%, Al: 0.001% to 0.030%, Nb: 0.010% to 1.000%, and N: 0.050% or less, with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si (mass %) satisfy Al/Ti&#x2265;8.4Si-0.78.

Ferrite-based stainless steel with high resistance to corrosiveness caused by exhaust gas and condensation and high brazing properties and method for manufacturing same

The present invention provides a rolled ferritic stainless steel material excellent in corrosion resistance and toughness, in particular suitable as a material for a flange and a method for producing the same and flange part. The rolled ferritic stainless steel material contains, by mass %, C: 0.001 to 0.08%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.01 to 0.05%, S: 0.0002 to 0.01%, Cr: 10.0 to 25.0%, and N: 0.001 to 0.05%, has a balance of Fe and unavoidable impurities, has a thickness of 5 mm or more, and has an area ratio of crystal grains with a &#x3c;011&#x3e; direction within 15&#xb0; from the rolling direction of 20% or more in a cross-section parallel to the rolling direction at any location between the left and right ends of the steel sheet.

Rolled ferritic stainless steel sheet, method for producing the same, and flange part

A method of increasing the thickness of a tube which increases a thickness of an end part of a tube without a burr being formed, comprising placing a tubebetween a dieand mandrelin the state with a space for increasing the thickness between a small diameter partof the mandreland a first end partof a tubeand between a large diameter hole partC of the dieand a second end partof the tube, using a first upsetting punchand a second upsetting punchto respectively process the first end partand the second end partof the tube, pulling out the mandrelfrom the tubein the state with the second upsetting punchconstraining the second end partof the tube, and using the first upsetting punchto push up the first end partof the tubeto take out the tubefrom the die

Method of increasing thickness of tube and increased thickness tube

A ferritic stainless steel sheet containing, by mass %, C: 0.020% or less, Cr: 10.0% to 25.0%, N: 0.020% or less, Sn: 0.010% to 0.50%, and one or more of Ti: 0.60% or less, Nb: 0.60% or less, V: 0.60% or less, and Zr: 0.60% or less so as to satisfy Equation (1): (Ti/48+V/51+Zr/91+Nb/93)/(C/12+N/14)&#x2265;1.0, wherein a difference between a stress &#x3c3;1 (N/mm) after prestrain imparting tensile deformation with 7.5% of strain, and an upper yield stress &#x3c3;2 (N/mm) when the steel sheet is subjected to heat treatment at 200&#xb0; C. for 30 minutes and then to tension again after the tensile deformation is 8 or less.

Ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment, and method of producing the same

This ferritic stainless steel sheet contains, in terms of % by mass, 0.02% or less of C, 0.02% or less of N, 0.10% to 0.60% of Si, 0.10% to 0.80% of Mn, 15.0% to 21.0% of Cr, more than 2.00% to 3.50% or less of Cu, 0.30% to 0.80% of Nb, 1.00% to 2.50% of Mo, and 0.0003% to 0.0030% of B, with a remainder being Fe and unavoidable impurities, wherein a maximum particle size of &#x3b5;-Cu that is present in a structure is 20 nm to 200 nm.

Ferritic stainless steel sheet having excellent heat resistance

Ferritic stainless steel sheet which is excellent in ridging resistance which comprises, by mass %, Cr: 10 to 30%, Sn: 0.005 to 1%, C: 0.001 to 0.1%, N: 0.001 to 0.1%, Si: 0.01 to 3.0%, Mn: 0.01 to 3.0%, P: 0.005 to 0.1%, and S: 0.0001 to 0.01% and has a balance of Fe and unavoidable impurities and which has an X-ray diffraction strength in the {100}&#x3c;012&#x3e; orientation from a surface layer to t/4 ('t' is sheet thickness) of 2 or more.

Method of producing ferritic stainless steel sheet

A heat-resistant cold rolled ferritic stainless steel sheet containing, in mass %, 0.02% or less of C, 0.1% to 1.0% of Si, greater than 0.6% to 1.5% of Mn, 0.01% to 0.05% of P, 0.0001% to 0.0100% of S, 13.0% to 20.0% of Cr, 0.1% to 3.0% of Mo, 0.005% to 0.20% of Ti, 0.3% to 1.0% of Nb, 0.0002% to 0.0050% of B, 0.005% to 0.50% of Al, 0.02% or less of N, with the balance being Fe and inevitable impurities, in which {111}-oriented grains are present at an area ratio of 20% or greater in a region from a surface layer to t/4 (t is a sheet thickness), {111}-oriented grains are present at an area ratio of 40% or greater in a region from t/4 to t/2, and {011}-oriented grains are present at an area ratio of 15% or less in the entire region in a thickness direction.

Hot rolled ferritic stainless steel sheet for cold rolling raw material

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Tokyo, Japan

Junichi Hamada