EP2220260A1 - Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication - Google Patents

Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication

Info

Publication number
EP2220260A1
EP2220260A1 EP08852156A EP08852156A EP2220260A1 EP 2220260 A1 EP2220260 A1 EP 2220260A1 EP 08852156 A EP08852156 A EP 08852156A EP 08852156 A EP08852156 A EP 08852156A EP 2220260 A1 EP2220260 A1 EP 2220260A1
Authority
EP
European Patent Office
Prior art keywords
less
corrosion resistance
stainless steel
ferritic stainless
stretchability
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08852156A
Other languages
German (de)
English (en)
Other versions
EP2220260A4 (fr
Inventor
Do Ieal Yoo
Soo Chan Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP2220260A1 publication Critical patent/EP2220260A1/fr
Publication of EP2220260A4 publication Critical patent/EP2220260A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

Definitions

  • the present invention relates to a low chrome ferritic stainless steel with a high corrosion resistance and stretchability and a method of manufacturing the same, and more specifically to a low chrome ferritic stainless steel with a high corrosion resistance and stretchability and a method of manufacturing the same used in various pipes and a muffler of a cold zone of an automobile exhaust system requiring a high corrosion resistance and a high formability.
  • Background Art
  • DBTT Ductile-Brittle Transition Temperature
  • a low chrome ferritic stainless steel with a high corrosion resistance and stretchability is composed of C of 0.03wt% or less, Si of 0.5wt% or less, Mn of 0.5wt% or less, P of 0.035wt% or less, S of 0.01wt% or less, Cr of 14 to 16wt%, Mo of 0.2wt% or less, N of 0.030wt% or less, Cu of 0.5wt% or less, Al of 0.05 wt% or less, Ni of 0.2wt% or less, C+N of 0.040wt% or less, Ti of 0.5wt% or less, remaining Fe, and inevitably added impurities, being controlled in EL value defined by Equation 1 below to be 33 or more and a P.I. value defined by Equation 2 below to be in a range of 14 to 16.
  • the low chrome ferritic stainless steel with the high corrosion resistance and stretchability can contain at lease any one component selected from a group consisting of Ca of 0.005 wt% or less, Mg of 0.005 wt% or less, and Zr of 0.01wt% or less.
  • the ratio of Ti/(C+N) preferably is in a range of 15 to
  • a method of manufacturing a low chrome ferritic stainless steel with a high corrosion resistance and stretchability comprises: hot rolling a slab of the ferritic stainless steel composed as described above at a heating temperature of 1230 to 1280°C and a finishing rolling temperature of 740 to 850°C; hot annealing the slab at 900 to 1000°C; cold annealing the slab at 900 to 1000°C to have a cold reduction ratio 50% or more; and adjusting the slab to have a particle size of a range of 6.0 to 7.0 in ASTM crystal particle size number.
  • Ductile-Brittle Transition Temperature by adjusting the addition amounts of Ca, Mg, and Zr, and to reduce fabrication cost by reducing the addition amounts of Cr and Mo, which are expensive materials, using the EL equation (Equation 1) and the P.I. equation (Equation 2), which are equations calculating an elongation and a fitting index, in order to control the heating temperature, the finishing rolling temperature, and the hot and cold annealing conditions of the slab.
  • FIG. 1 is a view showing a change of elongation according to a change of ASTM crystal particle size number after cold annealing in a 15Cr-Ti steel (specimen No. 1).
  • FIG. 2 is a view showing a change of elongation according to the ratio of Ti/(C+N) in the 15Cr-Ti steel.
  • FIG. 3 is a view showing a change of Ductile-Brittle Transition Temperature (DBTT) according to a change of addition amounts of Ca, Mg, and Zr in the 15Cr-Ti steel.
  • DBTT Ductile-Brittle Transition Temperature
  • a low chrome ferritic stainless steel having reduced Cr and Mo contents and at the same time, having a high corrosion resistance, stretchability, and pipe expanding properties at a low temperature is composed of C of 0.03wt% or less, Si of 0.5wt% or less, Mn of 0.5wt% or less, P of 0.035wt% or less, S of 0.01wt% or less, Cr of 14 to 16wt%, Mo of 0.2wt% or less, N of 0.030wt% or less, Cu of 0.5wt% or less, Al of 0.05 wt% or less, Ni of 0.4wt% or less, C+N of 0.040wt% or less, Ti of 0.05 wt% or less, remaining Fe and inevitably added impurities, on condition that an EL value defined by Equation 1 below is controlled to be 33 or more and a P.I. value defined by Equation2 below is controlled to be in a range of 14 to 16.
  • a cheap low chrome ferritic stainless steel containing component composition as described above and at least any one component selected from a group consisting of Ca of 0.005 wt% or less, Mg of 0.005 wt% or less, and Zr of 0.01wt% or less as other alloy composition and satisfying that the ratio of Ti/(C+N) is in a range of 15 to 20 is prepared.
  • a slab of such a steel is hot rolled at a heating temperature of 1230 to 1280°C and a finishing rolling temperature of 740 to 850°C, it is hot-annealed at 900 to 1000°C.
  • the particle size of a material is adjusted to be a range of 6.0 to 7.0 in ASTM crystal particle size number.
  • C and N which are Ti(C, N) carbonitride forming elements, exist in an interstitial form.
  • contents of C and N become high, solid C and N not formed into a Ti(C, N) carbonitride deteriorate the elongation and the stretchability of a material. Accordingly, the content of C is limited to be 0.03% or less, and the content of N also is limited to be 0.03% or less.
  • the content of C+N becomes high, a high content of Ti is added so that steelmaking inclusions increase, thereby causing many surface defects such as scab.
  • the content of C+N is limited to be 0.04% or less.
  • Si is a ferritic phase forming element.
  • content of Si increases, stability of a ferritic phase becomes high and oxidation resistance is improved.
  • Si of 0.5% or more is added, steelmaking Si inclusions increase so that the surface defect is easy to occur.
  • Si raises hardness, yield strength, and tensile strength but deteriorates the elongation, it is disadvantageous in formability. Therefore, the content of Si is limited to be 0.5% or less.
  • Ni is a gamma phase forming element.
  • a gamma phase increases.
  • the addition amount of Ni is limited to be 0.2% or less.
  • P and S form inclusions such as MnS, etc., to deteriorate the corrosion resistance and hot rolling formability. Therefore, contents of them are preferably managed as low as possible: the content of P is limited to be 0.035% or less and the content of S is limited to be 0.01% or less.
  • Al is an element added as a deoxidizer. When a large amount of Al is added, the surface defect occurs. Therefore, content of Al is limited to be 0.05% or less.
  • Cu is a gamma phase forming element like Ni.
  • the gamma phase increases.
  • content of Cu is limited to be 0.5% or less.
  • the ratio of Ti/(C+N) when the ratio of Ti/(C+N) becomes too low, the in- tergranular corrosion occurs at a welded portion after welding. On the contrary, when it becomes too high, the content of the solid Ti is raised so that the formability such as the elongation, etc., is deteriorated. Therefore, the ratio of Ti/(C+N) is limited to be in a range of 15 to 20.
  • the heating temperature of the slab is limited to be in a range of 1230 to 1280°C.
  • finishing rolling temperature at the time of hot rolling becomes low, variation accumulation energy during the hot rolling becomes high to help the recrystallization at the time of annealing. Accordingly, a low finishing rolling temperature is ad- vantageous for elongation improvement. However, when the finishing rolling temperature becomes too low, sticking surface defect occur due to adhesion of a rolling roll and a material. Therefore, the finishing rolling temperature is limited to be in a range of 740 to 850°C.
  • the cold reduction ratio of the material becomes too low, it is difficult to remove the surface defect and to secure the surface properties. On the contrary, when it becomes high, it is advantageous for improvement of formability. Therefore, the cold reduction ratio is limited to be 50% or more at the time of material manufacturing.
  • An ingot with a thickness of 120mm was manufactured by melting the ferritic stainless steel composed as in Table 1 below in a vacuum melting equipment of 50Kg.
  • the ingot manufactured as described above was heated at 1250°C, and hot rolled at a finishing rolling temperature of 800°C to manufacture a hot rolled steel with a thickness of 3.0mm. Then, it was hot annealed at 960°C and then acid-cleaned, to be cool rolled into a thickness of 1.5mmt and 0.6mmt. Thereafter, it was cool annealed at 960°C and then acid cleaned. A tension test and an Erichsen test were performed and crystal particle size of the cool annealed steel was measured using an image analyzer.
  • the Ductile-Brittle Transition Temperature was measured by processing the cool annealed steel (a steel to which Cr, Zr, Mg are added and a steel to which they are not added) with a thickness of 1.5mm to V notch impact specimen with server size and measuring impact test temperature in intervals of 10°C in a range of +20 to -70°C.
  • Table 1 and Table 2 indicate the chemical component by specimen, the EL and P.I. calculation values, the corrosion resistance (nominal potential), and the stretchability (Erichsen value), etc.
  • the contents of Cr and Mo were adjusted so that the P.I. value is in a range of 14 to 16 using Equation 2, which is an equation calculating the P.I. value, and product properties of the middle degree of the conventional steel (409: No.13, 439 steel: Mo.14) have been indicated.
  • the contents of C, N, Cr, Mo, and Ti/(C+N) were adjusted so that the EL value is 33 or more using Equation 1, which is an equation calculating the EL value.
  • the corrosion resistance is excellent, measured elongation is high as much as 34% or more, and Erichson value indicating the stretchability also is high as much as 9.3mm or more. Also, it is appreciated that in the inventive steel having the ratio of Ti(C+N) adjusted in the range of 15 to 20, the intergranular corrosion at the welded portion does not occur as compared to the comparative example out of this range.
  • FIG. 1 is a view showing a change in the elongation according to a change in ASTM crystal particle size of the annealed steel after cold annealing in 15Cr-Ti (specimen No. 1) steel. It is appreciated from FIG. 1 that the elongation is the most excellent in the ASTM crystal particle size number within the range of 6.0 to 7.0 at the time of the cool annealing.
  • FIG. 2 is a view showing a change of the elongation after the cool annealing according to the ratio of Ti/(C+N) in the 15Cr-Ti added steel, wherein as the ratio of Ti(C+N) is low, the elongation is excellent.
  • the ratio of Ti/(C+N) become less than 15, the intergranular corrosion at the welded portion occurs as in a result of Table 1, and when the ratio of Ti/(C+N) exceeds 20, the elongation is deteriorated. Therefore, it is required to add Ti while adjusting the ratio of Ti/(C+N) in the range of 15 to 20 in consideration of the intergranular corrosion at the welded portion and the elongation.
  • FIG. 3 is a view showing a change of the Ductile-Brittle Transition Temperature
  • DBTT Ductile-Brittle Transition Temperature

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente invention concerne un acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication, l'acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées étant composé de 0,03 % en poids de C ou moins, de 0,5 % en poids de Si ou moins, de 0,5 % en poids de Mn ou moins, de 0,035 % en poids de P ou moins, de 0,01 % en poids de S ou moins, de 14 à 16 % en poids de Cr, de 0,2 % en poids de Mo ou moins, de 0,030 % en poids de N ou moins, de 0,5 % en poids de Cu ou moins, de 0,05 % en poids d'Al ou moins, de 0,2 % en poids de Ni ou moins, de 0,040 % en poids de C + N ou moins, de 0,5 % en poids de Ti ou moins, le reste étant du Fe et des impuretés inévitablement ajoutées. La valeur d'EL définie par l'équation 1 ci-dessous de cet acier inoxydable est contrôlée de manière à être supérieure ou égale à 33 et la valeur de P.I. définie par l'équation 2 ci-dessous est contrôlée de manière à être située dans la plage de 14 à 16. EL = - 162,1 x (C+N) - 0,2 x Cr - l,l x Mo - 0,2 x Ti / (C+N) + 42,2 (1) P.I. = Cr + 3,3 Mo (2)
EP08852156A 2007-11-22 2008-09-30 Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication Withdrawn EP2220260A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020070119529A KR20090052954A (ko) 2007-11-22 2007-11-22 내식성 및 장출성형성이 우수한 저크롬 페라이트계스테인리스강 및 그 제조방법
PCT/KR2008/005744 WO2009066868A1 (fr) 2007-11-22 2008-09-30 Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication

Publications (2)

Publication Number Publication Date
EP2220260A1 true EP2220260A1 (fr) 2010-08-25
EP2220260A4 EP2220260A4 (fr) 2011-05-04

Family

ID=40667673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08852156A Withdrawn EP2220260A4 (fr) 2007-11-22 2008-09-30 Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication

Country Status (4)

Country Link
EP (1) EP2220260A4 (fr)
KR (1) KR20090052954A (fr)
CN (1) CN101874126A (fr)
WO (1) WO2009066868A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5152387B2 (ja) * 2010-10-14 2013-02-27 Ｊｆｅスチール株式会社 耐熱性と加工性に優れるフェライト系ステンレス鋼
CN102690994B (zh) * 2011-03-25 2014-08-13 宝山钢铁股份有限公司 一种中铬铁素体不锈钢及其制造方法
CN102690997A (zh) * 2011-03-25 2012-09-26 Posco公司 具有优良的高温强度的铁素体不锈钢及其制造方法
JP6593111B2 (ja) * 2015-11-05 2019-10-23 日本製鉄株式会社 Ｚｒ含有鍛造用鋼材
CN107552567A (zh) * 2017-09-08 2018-01-09 苏州钢特威钢管有限公司 1Cr17铁素体不锈钢管的制备方法
CN107873871A (zh) * 2017-11-29 2018-04-06 苏州市西山宏运材料用品厂 一种抗腐蚀炒茶锅
JP2024057167A (ja) * 2022-10-12 2024-04-24 日鉄ステンレス株式会社 フェライト系ステンレス鋼
CN117107166B (zh) * 2023-07-20 2025-07-25 武汉科技大学 一种低成本铁素体不锈钢及其制造方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149116A (en) * 1975-06-18 1976-12-21 Kawasaki Steel Corp Process for producing ferritics tainless steelplates without ridging
JPS5861258A (ja) * 1981-10-08 1983-04-12 Nisshin Steel Co Ltd 張り出し性および二次加工性に優れたフエライト系ステンレス鋼
DE3672280D1 (de) * 1985-02-19 1990-08-02 Kawasaki Steel Co Sehr weicher rostfreier stahl.
JP2589373B2 (ja) * 1989-05-15 1997-03-12 株式会社神戸製鋼所 高温水中における耐溶出性に優れたフェライト系ステンレス鋼
CA2123470C (fr) * 1993-05-19 2001-07-03 Yoshihiro Yazawa Acier ferritique inoxydable possedant une excellente resistance a la corrosion atmospherique et a celle des fissures
JPH07150244A (ja) * 1993-11-25 1995-06-13 Sumitomo Metal Ind Ltd 冷間加工用フェライトステンレス鋼の製造方法
JP4065579B2 (ja) * 1995-09-26 2008-03-26 Ｊｆｅスチール株式会社 面内異方性が小さく耐リジング性に優れるフェライト系ステンレス鋼板およびその製造方法
JP3276303B2 (ja) * 1997-04-14 2002-04-22 川崎製鉄株式会社 初期発銹の起こりにくい耐銹性に優れたフェライト系ステンレス鋼
KR100467719B1 (ko) * 2000-12-08 2005-01-24 주식회사 포스코 리징 저항성 및 스피닝 가공성이 우수한 페라이트계스테인리스강 및 그 제조 방법
EP1225242B1 (fr) * 2001-01-18 2004-04-07 JFE Steel Corporation Tôle d'acier ferritique inoxydable ayant une formabilité excellente et son procédé de fabrication
CN100357471C (zh) * 2002-03-27 2007-12-26 新日本制铁株式会社 铁素体不锈钢铸件和钢板及它们的制备方法
JP2003342694A (ja) * 2002-05-23 2003-12-03 Jfe Steel Kk スピニング加工性に優れた排気系膨径部材用のフェライト系ステンレス鋼
US7494551B2 (en) * 2002-06-17 2009-02-24 Jfe Steel Corporation Ferritic stainless steel plate with Ti and method for production thereof
JP3999141B2 (ja) * 2003-02-21 2007-10-31 日新製鋼株式会社 エンジン排ガス経路下流部材
JP2004323907A (ja) * 2003-04-24 2004-11-18 Nippon Steel Corp 耐初期錆び性に優れた自動車排気系部材用フェライト系ステンレス鋼
KR20040110644A (ko) * 2003-06-20 2004-12-31 주식회사 포스코 연신율이 우수한 페라이트계 스테인레스강 및 그 제조방법
JP4451324B2 (ja) * 2004-03-29 2010-04-14 新日鐵住金ステンレス株式会社 密着性に優れた黒色スケールを生成する燃焼機器用フェライト系ステンレス鋼

Also Published As

Publication number Publication date
KR20090052954A (ko) 2009-05-27
EP2220260A4 (fr) 2011-05-04
WO2009066868A1 (fr) 2009-05-28
CN101874126A (zh) 2010-10-27

Similar Documents

Publication Publication Date Title
CN104093871B (zh) 耐热铁素体系不锈钢冷轧钢板、冷轧基材用铁素体系不锈钢热轧钢板及其制造方法
US7101446B2 (en) Austenitic stainless steel
JP5433964B2 (ja) 曲げ加工性および低温靭性に優れる高張力鋼板の製造方法
JP6851269B2 (ja) フェライト系ステンレス鋼板、鋼管および排気系部品用フェライト系ステンレス部材ならびにフェライト系ステンレス鋼板の製造方法
JP5362582B2 (ja) 耐食性及び張出成形性に優れたフェライト系ステンレス鋼及びその製造方法
JP5181775B2 (ja) 曲げ加工性および低温靭性に優れる高張力鋼材ならびにその製造方法
JP5124988B2 (ja) 耐遅れ破壊特性に優れた引張強度９００ＭＰａ以上の高張力鋼板およびその製造方法
WO2009066868A1 (fr) Acier inoxydable ferritique à faible taux de chrome ayant une résistance à la corrosion et une extensibilité élevées et son procédé de fabrication
KR20040075981A (ko) 가공성이 우수한 Ｃｒ 함유 내열 강판 및 그 제조 방법
WO2012036313A1 (fr) Plaque en acier inoxydable thermorésistant de type ferrite présentant une excellente résistance à l'oxydation
JP7268182B2 (ja) フェライト系ステンレス鋼板およびその製造方法ならびにフェライト系ステンレス部材
EP3839087A1 (fr) Tôle d'acier inoxydable ferritique laminée à chaud et non recuite ayant une excellente solidité au choc, et son procédé de fabrication
JP4065579B2 (ja) 面内異方性が小さく耐リジング性に優れるフェライト系ステンレス鋼板およびその製造方法
KR102463485B1 (ko) 페라이트계 스테인리스 강판, 및 그 제조 방법 그리고 페라이트계 스테인리스 부재
JP6140856B1 (ja) 成形性に優れたフェライト・オーステナイト系ステンレス鋼板及びその製造方法
JP2002275595A (ja) 耐リジング性および深絞り性に優れたフェライト系ステンレス鋼板およびその製造方法
JP3932020B2 (ja) 深絞り性に優れ面内異方性の小さいフェライト系ステンレス鋼及びその製造方法
EP3699314A1 (fr) Acier inoxydable ferritique utilitaire possédant une excellente aptitude au façonnage à chaud et son procédé de fabrication
EP3699312A1 (fr) Acier inoxydable à base de ferrite à excellente ténacité à l'impact, et son procédé de production
JP4471486B2 (ja) 深絞り性に優れた中・高炭素鋼板
JP3886864B2 (ja) 二次加工性に優れるフェライト系ステンレス鋼冷延焼鈍材及びその製造方法
JP2002030346A (ja) 成形性に優れたＣｒ含有耐熱耐食鋼板の製造方法
JP3290598B2 (ja) 成形性および耐リジング性に優れるフェライト系ステンレス鋼板およびその製造方法
JP4740021B2 (ja) 形状凍結性に優れるＣｒ含有薄鋼板およびその製造方法
JP3950384B2 (ja) 加工性に優れた高強度鋼管及びその製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100608

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20110405

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 8/02 20060101ALI20110330BHEP

Ipc: C21D 6/00 20060101ALI20110330BHEP

Ipc: C22C 38/50 20060101ALI20110330BHEP

Ipc: C22C 38/42 20060101ALI20110330BHEP

Ipc: C22C 38/28 20060101ALI20110330BHEP

Ipc: C22C 38/20 20060101ALI20110330BHEP

Ipc: C22C 38/04 20060101ALI20110330BHEP

Ipc: C22C 38/02 20060101ALI20110330BHEP

Ipc: C22C 38/00 20060101ALI20110330BHEP

Ipc: C22C 38/18 20060101AFI20090617BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20110518