EP0570985B1 - Eisen-Chrom-Legierung mit hoher Korrosionsbeständigkeit - Google Patents

Eisen-Chrom-Legierung mit hoher Korrosionsbeständigkeit Download PDF

Info

Publication number
EP0570985B1
EP0570985B1 EP93108298A EP93108298A EP0570985B1 EP 0570985 B1 EP0570985 B1 EP 0570985B1 EP 93108298 A EP93108298 A EP 93108298A EP 93108298 A EP93108298 A EP 93108298A EP 0570985 B1 EP0570985 B1 EP 0570985B1
Authority
EP
European Patent Office
Prior art keywords
alloy
corrosion
resistance
alloys
content
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.)
Expired - Lifetime
Application number
EP93108298A
Other languages
English (en)
French (fr)
Other versions
EP0570985A1 (de
Inventor
Mitsuyuki c/o Technical Research Div. Fujisawa
Fusao C/O Technical Research Div. Togashi
Yasushi C/O Technical Research Div. Kato
Yoshihiro c/o Technical Research Div. Yazawa
Satoshi Tokyo Head Off. Kawasaki Steel Corp. Owada
Susumu c/o Technical Research Div. Satoh
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0570985A1 publication Critical patent/EP0570985A1/de
Application granted granted Critical
Publication of EP0570985B1 publication Critical patent/EP0570985B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • 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

Definitions

  • the present invention relates to an Fe-Cr alloy, more particularly an Fe-Cr stainless steel, which excels in corrosion resistance.
  • Fe-Cr alloys are known as materials which excel in corrosion resistance. It is also known that elements such as C, N, O and S in such an Fe-Cr alloy produce detrimental effects on the corrosion resistance for the reasons stated below.
  • C and N Formation of Cr-short layer due to generation of inter-granular Cr carbonitrides.
  • O and S Enhancement of rust originating points due to increase in the inclusions.
  • Japanese Patent Laid-Open JP-A-61-186451 discloses an Fe-Cr alloy having a Cr content ranging between 25 wt% and 50 wt%, wherein contents of C and N are lowered to specific values and Si, Mn and Mo are added in specified amounts, so as to achieve improved resistance to corrosion.
  • JP-A-57-126954 discloses an Fe-Cr alloy having a Cr content which is above 20.0 wt% but not more than 25.0 wt%, in particular a corrosion-resistant ferrite stainless steel in which contents of C and N are reduced and Mo, Mn and Nb are added in specified amounts so as to improve resistance to high-temperature cracking during welding, as well as to achieve improved toughness of weld.
  • Japanese Patent Laid-Open JP-A-3-2355 discloses an Fe-Cr alloy having a Cr content of from 16.0 wt% and 25.0 wt%, in particular a ferrite stainless steel in which Nb is added in a specified amount determined in relation to total content of C and N, so as to improve cold workability, toughness and corrosion resistance.
  • US-A-4360381 deals with problems concerning the decrease of the corrosion resistance of ferritic stainless steel alloys which are caused by interstitial elements such as C, N, S and O.
  • This object is achieved by a Fe-Cr alloy having the features of claim 1.
  • a further improved embodiment is indicated in subclaim 2.
  • a Fe-Cr alloy which has very small contents of C, N and O as compared with known alloys of this kind and which contains a specified amount of P, exhibits remarkably improved weather resistance.
  • the inventors further discovered that the intergranular corrosion resistance of the steel is further improved by addition of at least one element selected from the group consisting of Ti,
  • Fig. 1 is a graph illustrative of the relationship between the weather resistance of the steel and the total content (ppm) of C, N, O and S components of Fe-20%Cr-0.05%P alloys, as visually evaluated after 6-month exposure of south-oriented (inclination angle 36°) samples of the alloy at a location which is 5 m distant from a seashore.
  • the ranks or degrees of rusting evaluation are:
  • Fig. 2 illustrates the relationship between the degree of rusting and P content in Fe-18%Cr alloys having total C, N, O and S contents not less than 100 ppm and not more than 100 ppm, after 1-year exposure to atmosphere.
  • the degree of rusting was evaluated into the following four ranks:
  • Fig. 3 shows the relationship between the total contents of C, N, O and S of Fe-18%Cr-0.02%P alloys and the degree of pitting corrosion potential (V' C.10 (mV vs SCE)). It will be seen that high resistance to pitting corrosion is obtained when the total content of C, N, O and S is 100 ppm or less.
  • Fig. 4 shows the relationship between Mo content of Fe-18%Cr-0.1%P alloy having the C, N, O and S total content of 100 ppm or less and the pitting corrosion potential (V' C.10 (mV vs SCE)). It will be seen that resistance to pitting corrosion is further enhanced when the Mo content is 0.05 wt% or greater.
  • Fig. 5 shows the relationship between the degree of corrosion of Fe-20%Cr-0.03%P alloy having the C, N, O and S total content of 100 ppm or less and the (Ni + Co + 2Cu) value (wt%) of the alloy, as observed when the alloy was immersed in boiling 1% HCl aqueous solution for 18 hours. From this Figure, it is clear that the degree of corrosion decreases, i.e., the anti-acid property of the steel is improved, when the above-mentioned value is 0.01 wt% or greater.
  • Cr should be contained in an amount not less than 5 wt%, preferably not less than about 10 wt%. In order that the alloy of the present invention exhibits the required level of corrosion resistance, it is essential that the Cr content meets the requirement specified above.
  • C, N, O and S In conventional Fe-Cr alloy, these elements are contained in a total amount of several hundreds of ppm as inevitable or incidental impurities. In contrast, in the alloy of the present invention, the total content of these elements is limited to not more than 100 ppm, preferably not more than about 85 ppm. Such reduction of the total content of these elements is essential in the present invention, in order to achieve the improvement in corrosion resistance. As explained before in connection with Figs.
  • the alloy of the present invention contains P in an amount which falls between 0.01 wt% and 1.0 wt%, preferably between 0.015 and 0.3 wt%.
  • the above-specified P content provides excellent corrosion resistance of the alloy. Addition of P in excess of 1.0 wt%, however, is not recommended from the viewpoint of production because such a large P content undesirably reduces not only corrosion resistance but also toughness.
  • the Fe-Cr alloy according to the present invention having a Cr content and a total content of C, N, O and S and P which fall within the ranges specified above, exhibits superior corrosion resistance and, therefore, can suitably be used as the material of outer members of architectural structures, outer panels of automobiles and so forth.
  • the Fe-Cr alloy of the present invention can contain, in addition to the aforementioned elements, Al, Si and Mn as deoxidation elements. It is possible to achieve the object of the present invention when the alloy composition further contains Al, Si and Mn in amounts as specified below:
  • the Fe-Cr alloy of the present invention contains, in addition to the composition described above, at least one element selected from the group consisting of Ti, V, Zr, Ta, and B, in an amount which meets the following condition (1), preferably the following condition (1'): Condition (1) 0.01 wt% ⁇ Ti + Zr + V + Ta + 20B ⁇ 1,0 wt% Condition (1') 0.03 wt% ⁇ Ti + Zr + V + Ta + 20B ⁇ 0.5 wt%
  • the Fe-Cr alloy of the present invention exhibits superior resistance to intergranular corrosion, in addition to the corrosion resistance and, therefore, can suitably be used for the purposes where a high corrosion resistance is specifically required for weld parts.
  • the Fe-Cr alloy of the present invention can contain, in addition to the above composition 0.05 to 20 wt%, preferably 0.1 to 6.0 wt%, of Mo. Fe-Cr alloy of the present invention can exhibit sufficiently high resistance to corrosion even when Mo is not present. Addition of Mo in an amount specified above, however, acts to further increase resistance to pitting corrosion, as well as weather resistance. Addition of Mo in excess of 20 wt% undesirably makes the material hard while reducing the toughness of the base metal.
  • Said embodiment of the Fe-Cr alloy of the present invention which meets the requirements described above, provides superior resistance to pitting corrosion and weather resistance, as well as high corrosion resistance and, therefore, can be used suitably for purposes where high resistance to intergranular corrosion and high weather resistance are required, as well as high corrosion resistance.
  • a further embodiment contains, in addition to the above composition, 0.05 to 20 wt%, preferably 0.1 to 6.0 wt%, of Mo and at least one element selected from the group consisting of Ti, V, Zr, Ta, and B, by an amount which meets the approximate condition of the following condition (1), preferably approximately the following condition (1'): Condition (1) 0.01 wt% ⁇ Ti + Zr + V + Ta + 20B ⁇ 1,0 wt% Condition (1') 0.03 wt% ⁇ Ti + Zr + V + Ta + 20B ⁇ 0.5 wt%
  • the Fe-Cr alloy according to the present invention contains at least one element selected from the group consisting of Ni, Co and Cu in an amount which meets the following condition (2) or preferably condition (2'), in addition to the above composition.
  • Condition (2) 0.01 wt% ⁇ Ni + Co + 2Cu ⁇ 6 wt%
  • Condition (2') 0.05 wt% ⁇ Ni + Co + 2Cu ⁇ 5 wt%
  • the anti-acid property and weather resistance of the alloy is further improved.
  • the content of Ni, Co and/or Cu is below the range specified above, it is not possible to attain appreciable effect in improving the anti-acid property, whereas, when the range specified above is exceeded, production of the alloy is impeded.
  • the approximate content of each element is preferably determined as follows, for the reasons stated before.
  • the Fe-Cr alloy of the present invention exhibits superior anti-acid property, as well as high corrosion resistance, and, therefore, can suitably be used as structures in chemical plants.
  • a further embodiment of the Fe-Cr alloy of the present invention contains at least one element selected from the group consisting of Al, Si and Mn in an approximate amount which meets the following condition (3), preferably condition (3').
  • Condition (3) 1.0 wt% ⁇ 3Al + 2Si + Mn ⁇ 50 wt%
  • Condition (3') 3.0 wt% ⁇ 3Al + 2Si + Mn ⁇ 20 wt%
  • At least one of Al, Si and Mn is positively added for the purpose of improving oxidation resistance.
  • the Fe-Cr alloy of the present invention can exhibit superior corrosion resistance even when it lacks one or more of Al, Si and Mn. Addition of at least one of Al, Si and Mn, however, offers an additional advantage that the alloy can have further improved oxidation resistance.
  • the upper limit of about 50 wt% of the above-mentioned condition (3) is exceeded, oxide inclusions are dispersed in the alloy so as to impair producibility and workability, making it difficult to produce the alloy.
  • Said further embodiment of the Fe-Cr alloy of the invention meeting the above-described requirements exhibits large resistance to oxidation at high temperature, as well as excellent corrosion resistance, and, therefore, can advantageously be used as a material for the exhaust system of automobiles.
  • the alloys described hereinbefore can be produced through melting and casting from predetermined amounts of high-purity materials prepared by, for example, electrolytic processes. It is possible to use Al, Si and Mn as deoxidizers in this production process. After the melting and casting, the alloy may be subjected to ordinary process such as a process including the steps of hot rolling, annealing, pickling, cold rolling, annealing, (pickling), and temper rolling.
  • the balance other than the elements described above is Fe.
  • the effect of the present invention is never impaired even when one or more of elements selected from the group consisting of Ca, Mg, REM (rare earth metal), Pb, Bi, Se and Te is present in an amount within the typical ranges of the incidental impurities.
  • the advantages of the present invention can be achieved regardless whether the alloy is used in the form of a hot-rolled annealed sheet or a cold-rolled annealed sheet, and regardless of the state of finishing of the sheet, e.g., 2D, 2B, BA, HL or polishing. It should be noted that the alloys listed in the following Table 1 comprise only combinations of some of the compulsory elements of the alloy according to the invention. It should further be noted that the elements Nb and W are not contained in the alloy according to the invention.
  • Small ingots each being 30 kg in weight, were prepared from various Fe-Cr alloys having compositions as shown in Table 1, using an ultra-high-vacuum 50 kg RF furnace.
  • the melting was conducted by means of the ultra-high-vacuum furnace which can realize the maximum vacuum of 10 -7 Torr at normal temperature, using materials of high degrees of purity, in order to maintain the total content of S, C, N and O to the level not greater than 100 ppm.
  • several charges of ultra-high-purity iron were melted to wash the crucible, before the melting was actually conducted. The melting was conducted while forcible agitation was applied to the melt.
  • each sample ingot thus obtained was cut so that surface portions of 1 cm thick was removed therefrom. Then, the ingot was soaked for 1 hour at an appropriate temperature selected to range from about 1100 °C to about 1250 °C and then hot-rolled into sheet 4 mm thick, followed by annealing which was employed for the purpose of recrystallization. Then, after removal of the surface carbo-nitrided surface region by cutting, a cold rolling and a subsequent recrystallizing annealing were conducted once or twice, whereby a cold-rolled sheet 0.7 mm thick was finally obtained as the test sample. The surface portion of each test sample was removed by polishing as required.
  • test samples thus prepared were subjected to various corrosion tests for the purpose of evaluation of various anti-corrosion properties.
  • a test for examining the samples for resistance to intergranular corrosion was conducted in accordance with sulfuric acid/copper sulfate testing method specified by JIS (Japanese Industrial Standards) G 0575, and resistance to intergranular corrosion was evaluated based on whether cracks exist or not.
  • the potential at which pitting corrosion was caused was recorded in terms of the potential at which a current density of 10 ⁇ A/cm 2 was reached.
  • Test samples were immersed for 18 hours in boiling 0.5 % HCl aqueous solution, and losses of weight due to corrosion were measured for evaluation of anti-acid property into the following four ranks:
  • a cycling test was conducted by repeating cycles each consisting of 30-minute heating at 1075°C in the air and subsequent 12-minute cooling. Change in the weight was measured for every 25 cycles, and the number of cycles sustained until oxidation occur, more specifically until the oxidation weight increment exceeds 5.0 mg/m 2 , was recorded for the purpose of evaluation of oxidation resistance.
  • Tables 2, 3 and 4 respectively show the results of the weather resistance test conducted on the Fe-20%Cr alloy, Fe-11%Cr alloy and Fe-40%Cr alloy.
  • Table 5 shows the results of the weather resistance test on Fe-(4 - 20)%Cr-0.1%P alloys. Fe-(4 to 20)%Cr-0.1%P Alloy Alloy Evaluation of Rusting Degree Gloss Retention Ratio (%) C+N+O+S (ppm) Cr (wt%) Alloy 5 1 95 52 19.6 Alloy 7 2 82 86 11.1 Alloy 9 3 75 76 7.1 Comparison Alloy 6 5 21 71 4.8
  • Table 6 shows the results of the weather resistance test conducted on Fe-20%Cr-0.02%P alloys.
  • the alloy exhibited sufficiently high weather resistance even when Al, Si or Mn used as the deoxidation agent was present, contained, provided that the content of each of such deoxidizer is not more than about 1.0 wt% and provided that the requirements for the total content of C, N, O and S and the P content are met.
  • Table 7 shows the results of weather resistance test and intergranular corrosion test conducted on Fe-11%Cr-0.1%P alloys (C + N + O + S ⁇ 100 ppm). Fe-11%Cr-0.1%P(C+N+O+S ⁇ 100ppm) Alloy Evaluation of Rusting Degree Gloss Retention Ratio (%) Sulfur Acid/Copper Sulfate Test ⁇ Value (wt%) Alloy 14 2 79 No Cracking 0.015 Alloy 15 2 80 No Cracking 0.036 Alloy 16 2 82 No Cracking 0.039 Alloy 17 2 79 No Cracking 0.065 Alloy 18 2 81 No Cracking 0.131 Alloy 19 2 86 No Cracking 0.286 Alloy 20 2 79 No Cracking 0.913 Alloy 7 2 80 Cracked Tr. Comparison Alloy 4 5 29 Cracked Tr.
  • Table 8 shows the result of the weather resistance test and pitting corrosion test conducted on Fe-20%Cr-(0.01 - 0.4)%P-(0.001 - 6)%Mo alloys.
  • Table 9 shows the results of the weather resistance test and intergranular corrosion test conducted on the alloys Sample Nos. 26 and 27 of the present invention. Alloy Evaluation of Rusting Degree Gloss Retention Ratio (%) Sulfuric Acid/Copper Sulfate Test Pitting Corrosion Potential Alloy 26 2 99 No crack >1000 Alloy 27 3 78 No crack 450
  • Table 10 shows the results of weather resistance test and anti-acid test conducted on Fe-20%Cr-0.02P alloys (C + N + 0 + S ⁇ 100 ppm). Fe-20%Cr-0.02P Alloys (C+N+O+S ⁇ 100ppm) Alloy Evaluation of Rusting Degree Gloss Retention Ratio (%) Evaluation of Anti-Acid Property Ni+Co+2Cu Value (wt%) Alloy 28 2 86 O ⁇ 0.021 Alloy 29 1 91 O ⁇ 0.063 Alloy 30 1 90 O ⁇ 0.915 Alloy 3 2 85 ⁇ Tr. Alloy 4 1 92 ⁇ Tr.
  • Table 11 shows the results of weather resistance test and oxidation resistance tests conducted on Fe-20%Cr-0.015%P alloys (C + N + C + S ⁇ 100 ppm). Fe-20%Cr-0.015%P Alloys (C+N+O+S ⁇ 100 ppm) Alloy Evaluation of Rusting Degree Gloss Retention Ratio (%) No. of Cycles Sustained Untill Extraordinary Oxidation 3Al+2Si+Mn Value (wt%) Alloy 31 1 93 225 1.05 Alloy 32 1 90 250 13.76 Alloy 33 1 87 250 25.21 Alloy 2 1 90 25 Tr.
  • the Fe-Cr alloy of the present invention in its various forms provides superior corrosion resistance and, therefore, can suitably be used in various fields in which Fe-Cr alloys have been used conventionally and in which further improvement in corrosion resistance is specifically required.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (2)

  1. Eine korrosionsbeständige Fe-Cr-Legierung mit einer Zusammensetzung, umfassend:
    nicht weniger als 5 Gew.-% Cr,
    nicht mehr als insgesamt 100 ppm C, N, O und S;
    0,01 bis 1,0 Gew.-% P,
    wenigstens ein Element, ausgewählt aus der Gruppe bestehend aus Ni, Co und
    Cu in einer Menge, welche die folgende Bedingung erfüllt: 0,01 Gew.-% ≤ Ni + Co + 2 Cu ≤ 6 Gew.-%,
    wenigstens eines von Ti, V, Zr, Ta und B in einer Menge, welche die folgende Bedingung erfüllt: 0,01 Gew.-% ≤ Ti + Zr + V + Ta + 20 B ≤ 1,0 Gew.-% und
    Ti: von 0,01 bis 5 Gew.-%
    Zr: von 0,01 bis 0,5 Gew.-%
    V: von 0,01 bis 05 Gew.-%
    Ta: von 0,01 bis 0,5 Gew.-%
    B: von 0,0003 bis 0,01 Gew.-%
    und gegebenenfalls:
    0,05 bis 20 Gew.-% Mo,
    nicht mehr als 1,0 Gew.-% Al,
    nicht mehr als 1,0 Gew.-% Si und
    nicht mehr als 1,0 Gew.-% Mn,
    Rest Fe und herstellungsbedingte Verunreinigungen.
  2. Eine korrosionsbeständige Fe-Cr-Legierung gemäß Anspruch 1, die weiterhin wenigstens ein Element, ausgewählt aus der Gruppe bestehend aus Al, Si und Mn in einer Menge enthält, welche die folgende angenäherte Bedingung (3) erfüllt: 1,0 Gew.-% ≤ 3 Al + 2 Si + Mn ≤ 50 Gew.-%
EP93108298A 1992-05-21 1993-05-21 Eisen-Chrom-Legierung mit hoher Korrosionsbeständigkeit Expired - Lifetime EP0570985B1 (de)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP12862792 1992-05-21
JP12862792 1992-05-21
JP128627/92 1992-05-21
JP132549/92 1992-05-25
JP13254992 1992-05-25
JP13254992 1992-05-25
JP13244692 1992-05-25
JP132446/92 1992-05-25
JP13244692 1992-05-25
JP13677892 1992-05-28
JP13677892 1992-05-28
JP136778/92 1992-05-28

Publications (2)

Publication Number Publication Date
EP0570985A1 EP0570985A1 (de) 1993-11-24
EP0570985B1 true EP0570985B1 (de) 2001-08-16

Family

ID=27471403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108298A Expired - Lifetime EP0570985B1 (de) 1992-05-21 1993-05-21 Eisen-Chrom-Legierung mit hoher Korrosionsbeständigkeit

Country Status (3)

Country Link
EP (1) EP0570985B1 (de)
KR (1) KR960005601B1 (de)
DE (1) DE69330580T2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2123470C (en) * 1993-05-19 2001-07-03 Yoshihiro Yazawa Ferritic stainless steel exhibiting excellent atmospheric corrosion resistance and crevice corrosion resistance
US6207103B1 (en) * 1997-08-01 2001-03-27 Kawasaki Steel Corporation Fe-Cr-Si steel sheets having excellent corrosion resistance and method for manufacturing the same
AUPP042597A0 (en) * 1997-11-17 1997-12-11 Ceramic Fuel Cells Limited A heat resistant steel
JP2000259895A (ja) 1999-03-10 2000-09-22 Laurel Bank Mach Co Ltd 紙幣整理機
KR100503548B1 (ko) * 2000-05-31 2005-07-25 제이에프이 스틸 가부시키가이샤 초기 녹발생 방지성, 가공성 및 용접성이 우수한 철-크롬합금

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360381A (en) * 1980-04-11 1982-11-23 Sumitomo Metal Industries, Ltd. Ferritic stainless steel having good corrosion resistance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2402424A (en) * 1945-01-20 1946-06-18 Roy B Mccauley Hard alloys
US3992198A (en) * 1973-06-21 1976-11-16 E. I. Du Pont De Nemours & Company Ductile chromium-containing ferritic alloys
JPS59123745A (ja) * 1982-12-29 1984-07-17 Nisshin Steel Co Ltd 耐食性合金
FR2648210B1 (fr) * 1989-06-07 1991-09-06 Sofanou Sa Element de raccord pour tubes anneles

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360381A (en) * 1980-04-11 1982-11-23 Sumitomo Metal Industries, Ltd. Ferritic stainless steel having good corrosion resistance

Also Published As

Publication number Publication date
KR940005823A (ko) 1994-03-22
KR960005601B1 (ko) 1996-04-26
EP0570985A1 (de) 1993-11-24
DE69330580D1 (de) 2001-09-20
DE69330580T2 (de) 2001-11-29

Similar Documents

Publication Publication Date Title
JP2500162B2 (ja) 耐食性に優れた高強度二相ステンレス鋼
US8105447B2 (en) Austenitic stainless hot-rolled steel material with excellent corrosion resistance, proof stress, and low-temperature toughness
EP2058413B1 (de) Ferretisches edelstahlblech mit hervorragender hitzeresistenz
JP5186769B2 (ja) 耐硫酸露点腐食鋼
EP2557189B1 (de) Ferrit-edelstahlblech mit hoher wärmebeständigkeit und bearbeitbarkeit sowie herstellungsverfahren dafür
US9243306B2 (en) Ferritic stainless steel sheet excellent in oxidation resistance
KR20040007764A (ko) 배기가스 유로 부재용 페라이트계 스테인레스 강
WO2001094654A1 (en) Cold rolled steel sheet having excellent corrosion resistance to sulfuric acid
KR930005899B1 (ko) 내열용 오스테나이트계 스텐레스강
KR20200102489A (ko) 내염해 부식성이 우수한 페라이트계 스테인리스강
KR100496830B1 (ko) 연질의 Ｃｒ함유강
KR100831115B1 (ko) 모재 및 용접부의 인성이 우수한 내식강 및 그 제조 방법
EP0570985B1 (de) Eisen-Chrom-Legierung mit hoher Korrosionsbeständigkeit
KR100253543B1 (ko) 가공성이 우수한 Fe-Cr합금
JP3269799B2 (ja) 加工性、耐粒界腐食性および高温強度に優れるエンジン排気部材用フェライト系ステンレス鋼
EP0392011B1 (de) WÄRMEBESTÄNDIGER AUSTENITISCHER Al-STAHL MIT AUSGEZEICHNETEN WARMVERARBEITUNGSEIGENSCHAFTEN
EP0834590B1 (de) Ferritischer, rostfreier stahl für auspuffsystem
US4808371A (en) Exterior protective member made of austenitic stainless steel for a sheathing heater element
JPS6199660A (ja) ラインパイプ用高強度溶接鋼管
JP3845366B2 (ja) 溶接熱影響部靭性に優れた耐食鋼
EP4166680A1 (de) Ausscheidungshärtendes martensitisches edelstahlblech mit hervorragender ermüdungsbeständigkeit
JPH0717946B2 (ja) 耐濃硫酸腐食性に優れた二相ステンレス鋼の製造方法
KR880001356B1 (ko) 콜롬비움 혹은 티타니움을 함유하여 용접 가능한 낮은 침입형의 29% 크롬-4% 몰리브덴 페라이트 스텐레스 강
JP2801837B2 (ja) 耐食性に優れたＦｅ−Ｃｒ合金
KR100215727B1 (ko) 시그마상 형성이 억제된 고내식성 듀플렉스 스테인리스강

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19940524

17Q First examination report despatched

Effective date: 19961211

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 69330580

Country of ref document: DE

Date of ref document: 20010920

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090515

Year of fee payment: 17

Ref country code: DE

Payment date: 20090514

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090520

Year of fee payment: 17

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100521

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100521