WO2012137792A1 - ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 - Google Patents
ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 Download PDFInfo
- Publication number
- WO2012137792A1 WO2012137792A1 PCT/JP2012/059122 JP2012059122W WO2012137792A1 WO 2012137792 A1 WO2012137792 A1 WO 2012137792A1 JP 2012059122 W JP2012059122 W JP 2012059122W WO 2012137792 A1 WO2012137792 A1 WO 2012137792A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- less
- foil
- content
- stainless steel
- catalyst carrier
- Prior art date
Links
- 239000011888 foil Substances 0.000 title claims abstract description 76
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 37
- 239000010935 stainless steel Substances 0.000 title claims abstract description 36
- 239000003054 catalyst Substances 0.000 title claims abstract description 29
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 13
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 11
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 11
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 13
- 238000000746 purification Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 abstract description 37
- 238000007254 oxidation reaction Methods 0.000 abstract description 37
- 230000007797 corrosion Effects 0.000 abstract description 20
- 238000005260 corrosion Methods 0.000 abstract description 20
- 150000003839 salts Chemical class 0.000 abstract description 15
- 229910052742 iron Inorganic materials 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 24
- 239000010959 steel Substances 0.000 description 24
- 239000007789 gas Substances 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 14
- 230000007423 decrease Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 241000264877 Hippospongia communis Species 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000010960 cold rolled steel Substances 0.000 description 6
- 238000005219 brazing Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910001122 Mischmetal Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 229910052746 lanthanum Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000943 NiAl Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000988 reflection electron microscopy Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0225—Coating of metal substrates
-
- 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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/22—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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20715—Zirconium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/2073—Manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20753—Nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20761—Copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20769—Molybdenum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20776—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20784—Chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2092—Aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2807—Metal other than sintered metal
- F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
Definitions
- the present invention is used for catalyst carriers for exhaust gas purification devices such as automobiles, motorcycles, marine bikes, snowmobiles, etc., for high temperatures. Strength (especially, rupture stress and deformation resistance), excellent oxidation resistance at high temperatures, and excellent salt corrosion resistance Stainless steel foil (stainless steel foil) and An exhaust gas purifying device for a catalyst carrier using the foil.
- Ferritic stainless steel made of Fe-Cr-Al-based alloy has excellent oxidation resistance at high temperatures, so automobiles, motorcycles, marine bikes, motor boats, etc.
- exhaust gas purification device members for example, catalyst carriers, various sensors
- a stove for example, a gas burner, a heating furnace member (member) of heater or electric heating element by utilizing the characteristics of high electrical resistivity, etc.
- Patent Document 1 discloses that instead of a conventional ceramic catalyst carrier for the purpose of improving the downsizing and engine performance of a catalyst carrier for an exhaust gas purifying device of an automobile, A metal honeycomb using a 20-100 ⁇ m thick Fe—Cr—Al stainless steel foil having excellent oxidation resistance at high temperatures is disclosed.
- This metal honeycomb is formed, for example, by alternately stacking flat stainless steel foil (flat foil) and corrugated stainless steel foil (corrugated foil) to form a honeycomb structure (honeycomb structure).
- a catalytic material (catalytic material) is applied to the surface of the stainless steel foil and used in an exhaust gas purification device.
- FIG. 1 shows an example of a metal honeycomb, which is a metal produced by winding a stack of flat plates 1 and corrugated plates 2 into a roll shape and fixing the outer periphery thereof with an external cylinder 3.
- the honeycomb 4 is made.
- the wall thickness of the catalyst carrier When the wall thickness of the catalyst carrier is reduced by using such a stainless steel foil, its thermal capacity is reduced, so that the catalyst can be activated in a short time from engine starting or exhaust resistance (exhaust pressure). This is effective for downsizing the catalyst carrier and improving engine performance.
- Patent Document 2 discloses that an Fe-20Cr-5Al alloy containing Zr, Hf, and a rare earth element contains Mo and W, and further contains Ni in an amount of 1 to 15%, thereby precipitating NiAl.
- a heat resistant stainless steel foil having improved durability by improving the yield strength (strength) is disclosed.
- Patent Document 3 discloses a material having a low heat capacity and low exhaust pressure (low exhaust gas pressure) excellent in high-temperature strength. The foil thickness is less than 40 ⁇ m, and the Al amount and Cr amount are changed according to the foil thickness.
- Patent Document 4 a stainless steel foil further containing Nb, Mo, Ta, W, etc. is disclosed in Patent Document 4 as Fe-20Cr-5Al alloy containing Y misch metal (Mishmetal or mixed metals), Nb, Ta, Mo, An alloy foil for a metal carrier that contains W and has improved proof stress and oxidation resistance at high temperatures is disclosed. Further, Patent Document 5 discloses that an Fe-20Cr-5Al alloy containing La, Ce, Pr, and Nd contains a predetermined amount of Ta and Mo, W, and Nb with respect to C + N at a high temperature. A heat-resistant stainless steel foil having improved durability and improved durability is disclosed.
- the stainless steel foil described in Patent Document 2 contains a large amount of Ni, which is an austenite-stabilizing element, steel that is a ferrite-stabilizing element during the oxidation of the foil.
- the amount of solid solution Al decreases, and a portion of the ferrite is austenitizing, so the thermal expansion coefficient greatly changes, and the strength of the catalyst support at high temperatures In particular, there is a problem that the deformation resistance is lowered. As a result, the supported catalyst may be peeled off or the corrugated plate may be crushed.
- the strength at high temperature is improved by containing Nb and Ta, but there is a problem that the oxidation resistance at high temperature is remarkably lowered. Further, Nb and Ta can easily form oxides with Fe and Al, and these oxides deform the foil geometry in the heating process and the cooling process (high temperature). Strength reduction).
- An object of the present invention is to provide a stainless steel foil having high strength at high temperature, excellent oxidation resistance at high temperature, and excellent salt corrosion resistance, and a catalyst carrier for an exhaust gas purification apparatus using the foil. .
- the present inventors diligently studied to achieve the above object.
- the content of Ni, Nb and Ta was reduced, Cr was more than 15 mass%, Cu was 0.1%. It has been found that it is effective to contain not less than 03% by mass and 2.0 to 6.0% by mass of at least one of Mo and W.
- the present invention has been made on the basis of such findings.
- C 0.05% or less
- Si 2.0% or less
- Mn 1.0% or less
- S 0.003% or less.
- P 0.05% or less
- Cr more than 15.0% and less than 25.0%
- Ni 0.30% or less
- Al 3.0 to 10.0%
- Cu 0.03 to 1.0 %
- N 0.10% or less
- Ti 0.02% or less
- Nb 0.02% or less
- Ta 0.02% or less
- REM excluding Ce : 0.03 to 0.20%, Ce: 0.02% or less, containing at least one of Mo and W in a total of 2.0 to 6.0%, the balance being Fe and inevitable impurities
- a stainless steel foil is provided.
- REM excluding Ce is preferably La. Further, it is preferable that at least one of Mo and W is 3.0 to 5.5% in total in terms of mass%. Furthermore, at least one of Hf: 0.01 to 0.20% in mass%, Ca: 10 to 300 ppm, Mg: 15 to 300 ppm, and B: 3 to 100 ppm in mass ppm is individually or It is preferable to contain simultaneously.
- the foil thickness is preferably 20 to 100 ⁇ m.
- the present invention also provides a catalyst carrier for an exhaust gas purifying apparatus characterized by using a stainless steel foil having the above component composition and foil thickness.
- the stainless steel foil of the present invention is suitable not only for catalyst carriers for exhaust gas purifying apparatuses such as automobiles, motorcycles, marine bikes, and snowmobiles, but also for other combustion gas exhaust system devices.
- the C content is 0.05% or less, preferably 0.02% or less, but more preferably reduced as much as possible.
- the content is preferably 0.001% or more, and more preferably 0.003% or more.
- the Si content is 2.0% or less, preferably 1.0% or less.
- the content is preferably 0.05% or more, and more preferably 0.1% or more.
- Mn 1.0% or less
- the Mn content is 1.0% or less, preferably 0.5% or less.
- 0.05% or more is preferably contained, and more preferably 0.1% or more.
- the S content is 0.003% or less, preferably 0.001% or less, but more preferably reduced.
- the P content is 0.05% or less, preferably 0.03% or less, but more preferably reduced.
- Cr more than 15.0% and less than 25.0% Cr is one of the most important elements in the present invention and is an indispensable element for securing strength at high temperatures and salt corrosion resistance.
- the Cr content is 15.0% or less, the ferrite stabilizing element Al decreases when oxidation proceeds at high temperature, and austenite is generated, so the thermal expansion coefficient changes greatly, the strength at high temperature, In particular, the deformation resistance decreases. Moreover, salt damage corrosion resistance also falls.
- the Cr content is 25.0% or more, the toughness of the slab or hot-rolled sheet is lowered, so that hot cracking is liable to occur and the manufacturing cost is increased, and the economy is impaired. Therefore, the Cr content is more than 15.0% and less than 25.0%, preferably 18.0 to 23.0%.
- Ni 0.30% or less
- Ni is an austenite-stabilizing element, and when its content exceeds 0.30%, Al is depleted during the progress of oxidation at high temperature, and Cr is oxidized. When it starts, austenite is generated to change the thermal expansion coefficient of the foil, and defects such as foil constriction and fracture occur. Therefore, the Ni content is 0.30% or less, preferably 0.20% or less.
- the content thereof is preferably 0.05% or more, and more preferably 0.10% or more.
- Al 3.0 to 10.0%
- Al is an element that forms a highly protective Al 2 O 3 film on the foil surface and improves oxidation resistance at high temperatures. It also has the effect of improving the high temperature strength.
- the Al content is less than 3.0%, sufficient oxidation resistance cannot be obtained.
- the Al content exceeds 10.0%, it becomes difficult to produce a foil due to a decrease in workability. Therefore, the Al content is set to 3.0 to 10.0%. Preferably it is 4.0 to 6.0%.
- Cu 0.03 to 1.0%
- Cu is an Fe-Cr-Al stainless steel foil having a Cr content of over 15.0% and an Al content of 3.0% or more as in the present invention. It is an effective element for improving the properties.
- FIG. 2 shows C: 0.006 to 0.008%, Si: 0.12 to 0.15%, Mn: 0.14 to 0.18%, S: 0.0007 to 0.0008%, P: 0.022 to 0.026%, Cr: 18.0 to 18.4%, Ni: 0.11 to 0.15%, Al: 5.64 to 5.84%, N: 0.008 to 0.8.
- the Cu content of the alloy composed of mechanical impurities is 0 (however, 0% is below the detection limit. Specifically, it is less than 0.01%.
- the results of pitting corrosion potential in a 3.5% by mass NaCl solution at 30 ° C. measured by the method described later were shown in the range of 1.0% to 1.0%, but the Cu content was 0.03%. It can be seen that the pitting potential, which is an indicator of salt corrosion resistance, is improved by setting the ratio to at least%.
- the Cu content is set to 0.03 to 1.0%. Considering salt corrosion resistance and low cost, it is preferably 0.1 to 0.5%.
- the N content is 0.10% or less, preferably 0.05% or less.
- Ti 0.02% or less Ti is an element that is easily oxidized. When the content exceeds 0.02%, a large amount of Ti oxide is mixed in the Al 2 O 3 film, the brazing property is remarkably lowered, and the oxidation resistance at high temperature is also lowered. Therefore, the Ti content is 0.02% or less, preferably 0.01% or less, but more preferably reduced as much as possible.
- Nb 0.02% or less
- a non-protective oxide film of (Fe, Al) NbO 4 is formed, and the oxidation resistance at high temperatures is significantly reduced.
- (Fe, Al) NbO 4 has a large coefficient of thermal expansion, which facilitates deformation of the foil and causes catalyst peeling. Therefore, the Nb content is 0.02% or less, preferably 0.01% or less, but more preferably reduced as much as possible.
- Ta 0.02% or less Similar to Nb, when the Ta content exceeds 0.02%, (Fe, Al) TaO 4 has no protective property, and an oxide film having a large coefficient of thermal expansion is generated. While the oxidation resistance is remarkably lowered, the deformation of the foil is promoted and the catalyst is peeled off. Therefore, the Ta content is 0.02% or less, preferably 0.01% or less, but more preferably reduced.
- the total content of Nb and Ta is more preferably 0.03% or less, and further preferably 0.02% or less.
- Zr 0.005 to 0.20%
- Zr combines with C and N in the steel to improve the creep characteristics.
- the toughness is improved and the workability is improved to facilitate the production of the foil.
- it concentrates in the Al 2 O 3 grain boundary in the Al 2 O 3 film to improve the oxidation resistance at high temperature, the strength at high temperature, particularly the deformation resistance.
- the Zr content needs to be 0.005% or more.
- the Zr content is 0.005 to 0.20%, preferably 0.02 to 0.06%.
- REM excluding Ce refers to 14 elements excluding Ce from elements having atomic numbers of 57 to 71 such as La, Nd, and Sm.
- REM excluding Ce improves the adhesion of the Al 2 O 3 film has a very significant effect on peeling resistance improving Al 2 O 3 film in an environment that is repeatedly oxidized.
- the Al 2 O 3 columnar crystals that are produced are enlarged, the density of the oxide grain boundaries, which are the oxygen diffusion paths, is reduced, improving the resistance to oxidation at high temperatures and the strength at high temperatures, especially deformation resistance.
- the REM content excluding Ce needs to be 0.03% or more.
- the REM content excluding Ce exceeds 0.20%, the toughness is lowered, and the manufacture of the foil becomes difficult due to the lowering of workability. Therefore, the REM content excluding Ce is 0.03 to 0.20%, preferably 0.05 to 0.10%.
- a metal Misch metal
- this misch metal contains Ce, it is necessary to add in the range which Ce content does not exceed 0.02% for the reason mentioned later. If it is difficult to reduce Ce, the separated and purified metal is added alone. In this case, it is preferable to use La which is relatively inexpensive and easily available among REMs excluding Ce.
- Ce 0.02% or less
- the Ce content exceeds 0.02%, a CeO-type oxide is formed at the interface between the Al 2 O 3 coating and the base steel surface, and the strength at high temperatures, particularly deformation resistance, is increased. Remarkably deteriorates and causes shape defects. Therefore, the Ce content is 0.02% or less, but it is more preferable to reduce it as much as possible.
- At least one of Mo and W 2.0 to 6.0% in total Mo and W increase the breaking stress at high temperature, and the life of the catalyst carrier is improved. Moreover, these elements simultaneously stabilize the Al 2 O 3 film and improve the salt damage corrosion resistance.
- the content of at least one of Mo and W is 2.0% or more in total. It is necessary to.
- the total content of at least one of Mo and W is 2.0 to 6.0%, preferably 3.0 to 5.5%. More preferably, the content is 4.5 to 5.5%.
- the balance other than the component elements described above is Fe and inevitable impurities, but for the following reasons, Hf: 0.01 to 0.20%, Ca: 10 to 300 ppm, Mg: 15 to 300 ppm, and B: At least one of 3 to 100 ppm can be contained individually or simultaneously.
- Hf 0.01 to 0.20%
- Ca 10 to 300 ppm
- Mg 15 to 300 ppm
- B 3 to 100 ppm.
- At least one of Hf improves adhesion between the Al 2 O 3 film and the ground iron.
- the Hf content is preferably 0.01% or more.
- the Hf content exceeds 0.20%, it is mixed as HfO 2 in the Al 2 O 3 film, and becomes a diffusion path of oxygen, and on the contrary, the reduction of solid solution Al due to oxidation is accelerated.
- Fe and an intermetallic compound are formed, and toughness is reduced. Therefore, the Hf content is preferably 0.01 to 0.20%, more preferably 0.02 to 0.10%.
- Ca and Mg have the function of improving the adhesion of the Al 2 O 3 film, like Hf.
- the Ca content is preferably 10 ppm or more and the Mg content is preferably 15 ppm or more.
- the Mg content is preferably set to 15 ⁇ 300pp m, Ca content, and more preferably to 20 ⁇ 100 ppm of Mg content both.
- B has the effect of suppressing the precipitation of grain boundary precipitates and improving the durability of the support at high temperatures. Such an effect becomes remarkable when the B content is 3 ppm or more.
- the B content is preferably 3 to 100 ppm, more preferably 10 to 50 ppm.
- the foil thickness should be 20 to 100 ⁇ m. preferable.
- the foil thickness should be about 50 to 100 ⁇ m when vibration resistance and durability are required, and the foil thickness is particularly high when high cell density and low back pressure are required. Is more preferably about 20 to 50 ⁇ m.
- the stainless steel foil according to the present invention can be manufactured by the following manufacturing method, for example.
- steel containing the above composition is melted in a steel converter, electric furnace, etc., and then subjected to secondary refining after VOD (Vacuum Oxygen Decarburization) or AOD Argon Oxygen Decarburization.
- VOD Vauum Oxygen Decarburization
- AOD Argon Oxygen Decarburization A steel slab is formed by ingot-bundling rolling or continuous casting, heated to 1050 to 1250 ° C., and then hot rolled to form a hot-rolled steel sheet.
- the scale on the surface of the hot-rolled steel sheet is removed by pickling, shot blasting, grinding, etc., and annealing and cold rolling are repeated several times.
- a stainless foil having a predetermined foil thickness, for example, 20 to 100 ⁇ m is used.
- the cold-rolled steel sheet and foil thus obtained were evaluated for strength at high temperatures (breaking stress, deformation resistance), oxidation resistance at high temperatures, and salt corrosion resistance by the following methods.
- Breaking stress First, a heat treatment at the time of diffusion bonding or brazing joining of a contact between a corrugated plate (corrugated plate) and a flat plate to a cold rolled steel plate having a thickness of 1 mm is simulated (1200). The heat treatment at 30 ° C. for 30 minutes was performed in a vacuum of 4 ⁇ 10 ⁇ 5 Torr (5.3 ⁇ 10 ⁇ 3 Pa) or less. Next, the test piece shown in FIG. 3 was cut out from the cold-rolled steel sheet after the heat treatment, and a high temperature tensile test was performed at 900 ° C. to measure the breaking stress. At this time, the tensile speed was initially 0.2 mm / min and 5 mm / min after exceeding the yield strength. The measurement results of the breaking stress were xC for less than 40 MPa, B for 40 MPa or more and less than 60 MPa, A for 60 MPa or more, and A or B for satisfying the object of the present invention.
- Deformation resistance First, heat treatment at 1200 ° C. for 30 minutes corresponding to heat treatment at the time of diffusion bonding or brazing bonding is applied to a foil having a thickness of 40 ⁇ m at 4 ⁇ 10 ⁇ 5 Torr (5.3 ⁇ 10 ⁇ 3 Pa) or less. In a vacuum. Next, 100 mm width ⁇ 50 mm length test pieces were rounded into a cylindrical shape with a diameter of 5 mm in the length direction from the foil after heat treatment, and three end pieces were fastened by spot welding, and three pieces were produced from each foil. After heating in an air atmosphere furnace at 1150 ° C. for 400 hours, three average dimensional deformation amounts (ratio of increment of cylinder length after heating to cylinder length before heating) were measured. The measurement result of the average dimensional deformation amount is over 5% ⁇ C, over 3% over 5% is ⁇ B, 3% or less is ⁇ A, and ⁇ B or ⁇ A satisfies the object of the present invention. did.
- Oxidation resistance at high temperature First, heat treatment at 1200 ° C. for 30 minutes corresponding to heat treatment at the time of diffusion bonding or brazing bonding was applied to a foil having a thickness of 40 ⁇ m at 4 ⁇ 10 ⁇ 5 Torr (5.3 ⁇ 10 ⁇ 3). Pa) It was performed in the following vacuum. Next, three test pieces of 20 mm width ⁇ 30 mm length were collected from the heat-treated foil and heated in an air atmosphere furnace at 1150 ° C. ⁇ 400 hours to obtain an average oxidation increase of three pieces (change in weight before and after heating). The amount divided by the initial surface area) was measured. At this time, the scale exfoliated from the test piece after heating was also collected and added to the oxidation increase.
- Measurement results of the oxidation weight gain of average 15 g / m 2 exceeds a ⁇ C, 10g / m 2 greater than 15 g / m 2 or less ⁇ B, 10g / m 2 or less ⁇ is A, if ⁇ B or ⁇ A The object of the present invention was satisfied.
- Salt corrosion resistance First, a 20 mm square test piece was cut out from a cold-rolled steel sheet having a thickness of 1 mm, sealed with a resin leaving a surface of 11 ⁇ 11 mm, and then immersed in nitric acid at a concentration of 10% by weight for passivation treatment. Further, the surface 10 ⁇ 10 mm portion was polished. Next, based on JIS G0577 “Method for Measuring Pitting Corrosion Potential of Stainless Steel”, it was left standing for 10 minutes in a 3.5 mass% NaCl solution at 30 ° C., and a potential scan was started to measure the pitting potential. .
- the pitting corrosion potential measurement results are as follows: ⁇ C less than 200 (mV vs SCE), ⁇ B from 200 (mV vs SCE) to less than 400 (mV vs SCE), ⁇ A from 400 (mV vs SCE) to ⁇ A If B or ⁇ A, the object of the present invention was satisfied.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Toxicology (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
C含有量が0.05%を超えると、高温での強度が低下し、高温での耐酸化性も低下する。また、靭性の低下も招く。よって、C含有量は0.05%以下、好ましくは0.02%以下とするが、極力低減することがより好ましい。ただし、鋼の強度をより高めるには、0.001%以上含有させるのが好ましく、より好ましくは0.003%以上含有させる。
Si含有量が2.0%を超えると、靭性が低下するとともに、加工性の低下により箔の製造を困難にする。よって、Si含有量は2.0%以下、好ましくは1.0%以下とする。ただし、耐酸化性をより向上させるには、0.05%以上含有させるのが好ましく、より好ましくは0.1%以上含有させる。
Mn含有量が1.0%を超えると、高温での耐酸化性が低下する。また、耐塩害腐食性の低下も招く。よって、Mn含有量は1.0%以下、好ましくは0.5%以下とする。ただし、鋼中のSを更に固定するには、0.05%以上含有させるのが好ましく、より好ましくは0.1%以上含有させる。
S含有量が0.003%を超えると、触媒担体におけるAl2O3皮膜の密着性や高温での耐酸化性が低下する。よって、S含有量は0.003%以下、好ましくは0.001%以下とするが、極力低減することがより好ましい。
P含有量が0.05%を超えると、加工性が低下して箔の製造を困難にするだけでなく、触媒担体におけるAl2O3皮膜の密着性や高温での耐酸化性が低下する。よって、P含有量は0.05%以下、好ましくは0.03%以下とするが、極力低減することがより好ましい。
Crは本発明において最も重要な元素の一つであり、高温での強度および耐塩害腐食性を確保する上で必要不可欠な元素である。しかし、Cr含有量が15.0%以下では、高温での酸化進行時にフェライト安定化元素であるAl等が減少し、オーステナイトが生成するため、熱膨張係数が大きく変化し、高温での強度、特に耐変形性が低下する。また、耐塩害腐食性も低下する。一方、Cr含有量が25.0%以上では、スラブや熱延板の靭性が低下するため熱間割れが生じやすく製造コストが増大し、経済性を損なう。よって、Cr含有量は15.0%超25.0%未満、好ましくは18.0~23.0%とする。
Niはオーステナイト安定化元素(austenite−stabilizing element)であり、その含有量が0.30%を超える場合は、高温での酸化進行時にAlが枯渇し、Crが酸化され始めると、オーステナイトが生成して箔の熱膨張係数を変化させ、箔の括れ(constriction)や破断などの不具合が発生する。よって、Ni含有量は0.30%以下、好ましくは0.20%以下とする。なお、Niは触媒担体製造時のロウ付け性を向上する効果があるため、その含有量は0.05%以上とすることが好ましく、0.10%以上とすることがより好ましい。
Alは箔表面に保護性の高いAl2O3皮膜を形成し、高温での耐酸化性を向上させる元素である。高温強度を向上させる効果も有する。しかし、Al含有量が3.0%未満では、十分な耐酸化性が得られない。一方、Al含有量が10.0%を超えると、加工性の低下により箔の製造を困難にする。よって、Al含有量は3.0~10.0%とする。好ましくは4.0~6.0%とする。
Cuは、本発明のようなCr含有量が15.0%超、Al含有量が3.0%以上のFe−Cr−Al系ステンレス箔において、高温での耐酸化性の向上および耐塩害腐食性の改善に効果的な元素である。図2に、C:0.006~0.008%、Si:0.12~0.15%、Mn:0.14~0.18%、S:0.0007~0.0008%、P:0.022~0.026%、Cr:18.0~18.4%、Ni:0.11~0.15%、Al:5.64~5.84%、N:0.008~0.011%、Ti:0.003~0.006%、Nb:0.003~0.004%、Ta:0.003~0.005%、Zr:0.032~0.037%、La:0.069~0.075%、Ce:0.001~0.002%、Mo:2.95~3.08%、Ca:24~34ppm、Mg:21~27ppmを含有し、残部がFeおよび不可避的不純物からなる合金のCu含有量を0(ただし、この0%は検出限界以下であることを示す。具体的には、0.01%未満であることを示す。)~1.0%の範囲に変えて、後述する方法により測定した30℃の3.5質量%NaCl溶液中における孔食電位の結果を示したが、Cu含有量を0.03%以上にすることにより、耐塩害腐食性の指標である孔食電位が向上することがわかる。
N含有量が0.10%を超えると、靱性が低下するとともに、加工性の低下により箔の製造を困難にする。よって、N含有量は0.10%以下、好ましくは0.05%以下とする。
Tiは酸化されやすい元素である。その含有量が0.02%を超えると、Ti酸化物がAl2O3皮膜中に多量に混入し、ロウ付け性が著しく低下するとともに、高温での耐酸化性も低下する。よって、Ti含有量は0.02%以下、好ましくは0.01%以下とするが、極力低減することがより好ましい。
Nb含有量が0.02%を超えると、(Fe,Al)NbO4の保護性のない酸化皮膜(oxidelayer)が生成し、高温での耐酸化性が著しく低下する。また、(Fe,Al)NbO4は熱膨張率が大きいため、箔の変形を助長し、触媒の剥離を引き起こす。よって、Nb含有量は0.02%以下、好ましくは0.01%以下とするが、極力低減することがより好ましい。
Nbと同様、Ta含有量が0.02%を超えると、(Fe,Al)TaO4の保護性がなく、熱膨張率が大きい酸化皮膜が生成し、高温での耐酸化性が著しく低下するとともに、箔の変形を助長し、触媒の剥離を引き起こす。よって、Ta含有量は0.02%以下、好ましくは0.01%以下とするが、極力低減することがより好ましい。
Zrは鋼中のC、Nと結合し、クリープ特性を改善する。また、同時に靭性が向上するとともに、加工性が向上して箔の製造を容易にする。さらに、Al2O3皮膜中においてAl2O3粒界に濃化して高温での耐酸化性や、高温での強度、特に耐変形性を向上させる。このような効果を得るには、Zr含有量は0.005%以上とする必要がある。一方、Zr含有量が0.20%を超えると、Feなどと金属間化合物をつくり、靭性を低下させる。よって、Zr含有量は0.005~0.20%、好ましくは0.02~0.06%とする。
Ceを除くREMとは、La、Nd、Smなど原子番号57~71までの元素からCeを除く14種の元素をいう。
一般に、Ceを除くREMはAl2O3皮膜の密着性を改善し、繰り返し酸化される環境下においてAl2O3皮膜の耐剥離性向上に極めて顕著な効果を有する。また、生成するAl2O3の柱状晶を大きくするので、酸素の拡散経路である酸化物粒界の密度が小さくなり、高温での耐酸化性や高温での強度、特に耐変形性を向上させる。このような効果を得るには、Ceを除くREM含有量は0.03%以上とする必要がある。一方、Ceを除くREM含有量が0.20%を超えると、靭性が低下するとともに、加工性の低下により箔の製造を困難にする。よって、Ceを除くREM含有量は0.03~0.20%、好ましくは0.05~0.10%とする。
なお、Ceを除くREMの添加には、コスト低減のためこれらが分離精製されていない金属(ミッシュメタル)を用いることもできる。ただし、このミッシュメタルがCeを含有する場合、後述の理由によりCe含有量が0.02%を超えない範囲で添加する必要がある。Ceの低減が困難であれば分離精製された金属を単独で添加する。この場合Ceを除くREMの中でも比較的安価で入手が容易であるLaを用いることが好ましい。
Ce含有量が0.02%を超えると、Al2O3皮膜と母材鋼表面との界面にCeO型の酸化物が生成し、高温での強度、特に耐変形性を著しく劣化させ、形状不良を引き起こす。よって、Ce含有量は0.02%以下とするが、極力低減することがより好ましい。
MoおよびWは高温での破断応力を増大し、触媒担体の寿命が良好となる。また、これらの元素は、同時に、Al2O3皮膜を安定化させ、耐塩害腐食性を向上させる。本発明のようなCr含有量が15.0%超25.0%未満の合金において、このような効果を得るには、MoおよびWのうち少なくとも一種の含有量は合計で2.0%以上とする必要がある。一方、MoおよびWのうち少なくとも一種の含有量が合計で6.0%を超えると、加工性の低下により箔の製造を困難にする。よって、MoおよびWのうち少なくとも一種の含有量は合計で2.0~6.0%、好ましくは3.0~5.5%とする。より好ましくは4.5~5.5%とする。
HfはAl2O3皮膜と地鉄の密着性を良好にし、さらに固溶Alの減少を抑制するため、高温での耐酸化性を向上させる効果がある。このような効果を得るには、Hf含有量は0.01%以上とすることが好ましい。一方、Hf含有量が0.20%を超えると、Al2O3皮膜中にHfO2として混入して、酸素の拡散経路となり、かえって酸化による固溶Alの減少を早める。また、Feと金属間化合物を形成し、靭性を低下させる。よって、Hf含有量は0.01~0.20%とすることが好ましく、0.02~0.10%とすることがより好ましい。
[鋼No.14]Mo含有量が本発明範囲未満のため高温強度が劣る。
[鋼No.15]La含有量が本発明範囲未満かつCe含有量が本発明範囲超えのため、耐酸化性が劣り、異常酸化発生に伴う形状変化を生じる。Ceが本発明範囲超えのため耐形状変化性が劣る。
[鋼No.16]Al含有量が本発明範囲未満のため、耐酸化性が劣り異常酸化発生に伴う形状変化を生じる。
2 波板
3 外筒
4 金属製ハニカム
Claims (6)
- 質量%で、C:0.05%以下、Si:2.0%以下、Mn:1.0%以下、S:0.003%以下、P:0.05%以下、Cr:15.0%超25.0%未満、Ni:0.30%以下、Al:3.0~10.0%、Cu:0.03~1.0%、N:0.10%以下、Ti:0.02%以下、Nb:0.02%以下、Ta:0.02%以下、Zr:0.005~0.20%、Ceを除くREM:0.03~0.20%、Ce:0.02%以下、MoおよびWのうち少なくとも一種を合計で2.0~6.0%含有し、残部がFeおよび不可避的不純物であるステンレス箔。
- Ceを除くREMがLaである請求項1に記載のステンレス箔。
- 質量%で、MoおよびWのうち少なくとも一種が合計で3.0~5.5%である請求項1または2に記載のステンレス箔。
- さらに、質量%で、Hf:0.01~0.20%と、質量ppmで、Ca:10~300ppm、Mg:15~300ppmおよびB:3~100ppmのうち少なくとも一種を含有する請求項1~3に記載のステンレス箔。
- 箔厚が20~100μm以上である請求項1~4のいずれか一項に記載のステンレス箔。
- 請求項1~5のいずれか一項に記載のステンレス箔を用いた排ガス浄化装置用触媒担体。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES12768301.9T ES2624497T3 (es) | 2011-04-01 | 2012-03-28 | Lámina de acero inoxidable y portador de catalizador para sistema de control de emisiones de escape que utiliza dicha lámina |
US14/008,335 US9624563B2 (en) | 2011-04-01 | 2012-03-28 | Stainless steel foil and catalyst carrier for exhaust gas purifying device using the foil |
KR1020137027038A KR20130135349A (ko) | 2011-04-01 | 2012-03-28 | 스테인리스박 및 그 박을 사용한 배기 가스 정화 장치용 촉매 담체 |
EP12768301.9A EP2695962B1 (en) | 2011-04-01 | 2012-03-28 | Stainless steel foil and catalyst carrier for exhaust emission control system using said foil |
CN201280016982.2A CN103459644B (zh) | 2011-04-01 | 2012-03-28 | 不锈钢箔以及使用该箔的排气净化装置用催化剂载体 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011081600 | 2011-04-01 | ||
JP2011-081600 | 2011-04-01 | ||
JP2012000914 | 2012-01-06 | ||
JP2012-000914 | 2012-01-06 | ||
JP2012-064829 | 2012-03-22 | ||
JP2012064829A JP5126437B1 (ja) | 2011-04-01 | 2012-03-22 | ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012137792A1 true WO2012137792A1 (ja) | 2012-10-11 |
Family
ID=46969188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/059122 WO2012137792A1 (ja) | 2011-04-01 | 2012-03-28 | ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 |
Country Status (8)
Country | Link |
---|---|
US (1) | US9624563B2 (ja) |
EP (1) | EP2695962B1 (ja) |
JP (1) | JP5126437B1 (ja) |
KR (1) | KR20130135349A (ja) |
CN (1) | CN103459644B (ja) |
ES (1) | ES2624497T3 (ja) |
TW (1) | TWI507545B (ja) |
WO (1) | WO2012137792A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112609126A (zh) * | 2020-11-13 | 2021-04-06 | 宁波宝新不锈钢有限公司 | 一种核电设备用奥氏体不锈钢及其制备方法 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX2018003852A (es) | 2015-09-29 | 2018-06-15 | Jfe Steel Corp | Acero inoxidable ferritico. |
BR102016001063B1 (pt) | 2016-01-18 | 2021-06-08 | Amsted Maxion Fundição E Equipamentos Ferroviários S/A | liga de aço para componentes ferroviários, e processo de obtenção de uma liga de aço para componentes ferroviários |
WO2018074405A1 (ja) * | 2016-10-17 | 2018-04-26 | Jfeスチール株式会社 | ステンレス鋼板およびステンレス箔 |
WO2019150762A1 (ja) | 2018-01-30 | 2019-08-08 | Jfeスチール株式会社 | Fe-Cr合金およびその製造方法、ならびに、抵抗発熱体 |
EP3929322A4 (en) * | 2019-02-19 | 2022-12-07 | JFE Steel Corporation | FERRITIC STAINLESS STEEL SHEET, METHOD FOR PRODUCING IT, AND STAINLESS STEEL SHEET HAVING A VAPOR DEPOSITED AL LAYER |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5696726A (en) | 1979-11-28 | 1981-08-05 | Gen Motors Corp | Foil clad with oxide whisker and its manufacture |
JPH04350148A (ja) * | 1991-05-29 | 1992-12-04 | Kawasaki Steel Corp | 耐久性に優れたFe−Cr−Al合金およびそれを用いた触媒担体 |
JPH05277380A (ja) | 1992-03-31 | 1993-10-26 | Nippon Steel Corp | 自動車排ガス浄化触媒高耐熱型メタル担体用Fe−Cr−Al系合金箔 |
JPH06116686A (ja) * | 1992-10-06 | 1994-04-26 | Kawasaki Steel Corp | 耐酸化性に優れたFe−Cr−Al系合金およびその箔 |
JPH06212363A (ja) * | 1993-01-12 | 1994-08-02 | Kawasaki Steel Corp | 高温耐酸化性および高温耐久性に優れたFe−Cr−Al系合金鋼 |
JPH06104879B2 (ja) | 1990-09-04 | 1994-12-21 | 新日本製鐵株式会社 | 燃焼排ガス浄化触媒担体用耐熱ステンレス箔 |
JP3210535B2 (ja) | 1994-12-20 | 2001-09-17 | 新日本製鐵株式会社 | 低熱容量・低背圧の排ガス浄化用メタル担体 |
JP2004169110A (ja) * | 2002-11-20 | 2004-06-17 | Nippon Steel Corp | ステンレス鋼板及びそれを用いてなるハニカム構造体 |
JP2005504176A (ja) | 2001-10-02 | 2005-02-10 | サンドビック アクティエボラーグ | 高温用途用フェライトステンレス鋼およびその箔の製造方法 |
JP2009046718A (ja) * | 2007-08-17 | 2009-03-05 | Jfe Steel Kk | 合金箔と排気ガス浄化装置用触媒担体 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04354850A (ja) | 1991-05-29 | 1992-12-09 | Nisshin Steel Co Ltd | 耐高温酸化性に優れた高Al含有フェライト系ステンレス鋼 |
JP2001164341A (ja) * | 1999-12-10 | 2001-06-19 | Nippon Steel Corp | 加工部耐食性に優れた鋼 |
KR100762151B1 (ko) * | 2001-10-31 | 2007-10-01 | 제이에프이 스틸 가부시키가이샤 | 딥드로잉성 및 내이차가공취성이 우수한 페라이트계스테인리스강판 및 그 제조방법 |
EP1553198A4 (en) * | 2002-06-14 | 2005-07-13 | Jfe Steel Corp | HEAT-RESISTANT FERRITIC STAINLESS STEEL AND ASSOCIATED METHOD OF MANUFACTURE |
WO2004046406A1 (ja) * | 2002-11-20 | 2004-06-03 | Nippon Steel Corporation | 高Al含有ステンレス鋼板及び複層板、およびそれらの製造方法並びに、それらを用いてなるハニカム体及びその製造方法 |
DE10310865B3 (de) | 2003-03-11 | 2004-05-27 | Thyssenkrupp Vdm Gmbh | Eisen-Chrom-Aluminium-Legierung |
SE527742C2 (sv) * | 2004-02-23 | 2006-05-30 | Sandvik Intellectual Property | Ferritiskt stål för högtemperaturtillämpningar, sätt att framställa detta, produkt och användning av stålet |
SE528027C2 (sv) * | 2004-04-16 | 2006-08-08 | Sandvik Intellectual Property | Användning av ett ferritiskt stål i katalysatorer för dieselmotorer |
DE102008018135B4 (de) * | 2008-04-10 | 2011-05-19 | Thyssenkrupp Vdm Gmbh | Eisen-Chrom-Aluminium-Legierung mit hoher Lebensdauer und geringen Änderungen im Warmwiderstand |
JP5349153B2 (ja) * | 2009-06-15 | 2013-11-20 | 日新製鋼株式会社 | ろう付け用フェライト系ステンレス鋼材および熱交換器部材 |
-
2012
- 2012-03-22 JP JP2012064829A patent/JP5126437B1/ja active Active
- 2012-03-28 US US14/008,335 patent/US9624563B2/en active Active
- 2012-03-28 KR KR1020137027038A patent/KR20130135349A/ko active Search and Examination
- 2012-03-28 WO PCT/JP2012/059122 patent/WO2012137792A1/ja active Application Filing
- 2012-03-28 EP EP12768301.9A patent/EP2695962B1/en active Active
- 2012-03-28 ES ES12768301.9T patent/ES2624497T3/es active Active
- 2012-03-28 CN CN201280016982.2A patent/CN103459644B/zh active Active
- 2012-03-30 TW TW101111299A patent/TWI507545B/zh active
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5696726A (en) | 1979-11-28 | 1981-08-05 | Gen Motors Corp | Foil clad with oxide whisker and its manufacture |
JPH06104879B2 (ja) | 1990-09-04 | 1994-12-21 | 新日本製鐵株式会社 | 燃焼排ガス浄化触媒担体用耐熱ステンレス箔 |
JPH04350148A (ja) * | 1991-05-29 | 1992-12-04 | Kawasaki Steel Corp | 耐久性に優れたFe−Cr−Al合金およびそれを用いた触媒担体 |
JPH05277380A (ja) | 1992-03-31 | 1993-10-26 | Nippon Steel Corp | 自動車排ガス浄化触媒高耐熱型メタル担体用Fe−Cr−Al系合金箔 |
JPH06116686A (ja) * | 1992-10-06 | 1994-04-26 | Kawasaki Steel Corp | 耐酸化性に優れたFe−Cr−Al系合金およびその箔 |
JPH06212363A (ja) * | 1993-01-12 | 1994-08-02 | Kawasaki Steel Corp | 高温耐酸化性および高温耐久性に優れたFe−Cr−Al系合金鋼 |
JP3210535B2 (ja) | 1994-12-20 | 2001-09-17 | 新日本製鐵株式会社 | 低熱容量・低背圧の排ガス浄化用メタル担体 |
JP2005504176A (ja) | 2001-10-02 | 2005-02-10 | サンドビック アクティエボラーグ | 高温用途用フェライトステンレス鋼およびその箔の製造方法 |
JP2004169110A (ja) * | 2002-11-20 | 2004-06-17 | Nippon Steel Corp | ステンレス鋼板及びそれを用いてなるハニカム構造体 |
JP2009046718A (ja) * | 2007-08-17 | 2009-03-05 | Jfe Steel Kk | 合金箔と排気ガス浄化装置用触媒担体 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2695962A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112609126A (zh) * | 2020-11-13 | 2021-04-06 | 宁波宝新不锈钢有限公司 | 一种核电设备用奥氏体不锈钢及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
EP2695962A4 (en) | 2015-01-28 |
TW201250012A (en) | 2012-12-16 |
JP2013155435A (ja) | 2013-08-15 |
ES2624497T3 (es) | 2017-07-14 |
US20140287914A1 (en) | 2014-09-25 |
TWI507545B (zh) | 2015-11-11 |
EP2695962A1 (en) | 2014-02-12 |
EP2695962B1 (en) | 2017-02-22 |
JP5126437B1 (ja) | 2013-01-23 |
CN103459644B (zh) | 2016-08-10 |
US9624563B2 (en) | 2017-04-18 |
CN103459644A (zh) | 2013-12-18 |
KR20130135349A (ko) | 2013-12-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5522330B2 (ja) | フェライト系ステンレス箔 | |
JP5760525B2 (ja) | ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 | |
JP5561447B1 (ja) | ステンレス鋼板およびステンレス箔 | |
WO2012137792A1 (ja) | ステンレス箔およびその箔を用いた排ガス浄化装置用触媒担体 | |
JP6319537B1 (ja) | ステンレス鋼板およびステンレス箔 | |
WO2016031192A1 (ja) | フェライト系ステンレス箔およびその製造方法 | |
JP6846445B2 (ja) | 耐熱フェライト系ステンレス鋼板 | |
JPH09296259A (ja) | 断続的加熱時の耐久性に優れたフェライト系ステンレス鋼 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12768301 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20137027038 Country of ref document: KR Kind code of ref document: A |
|
REEP | Request for entry into the european phase |
Ref document number: 2012768301 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012768301 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14008335 Country of ref document: US |