WO2014097562A1 - ステンレス鋼板およびステンレス箔 - Google Patents
ステンレス鋼板およびステンレス箔 Download PDFInfo
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- WO2014097562A1 WO2014097562A1 PCT/JP2013/007147 JP2013007147W WO2014097562A1 WO 2014097562 A1 WO2014097562 A1 WO 2014097562A1 JP 2013007147 W JP2013007147 W JP 2013007147W WO 2014097562 A1 WO2014097562 A1 WO 2014097562A1
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- Prior art keywords
- stainless steel
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- foil
- toughness
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 87
- 239000010935 stainless steel Substances 0.000 title claims abstract description 84
- 239000011888 foil Substances 0.000 title claims abstract description 61
- 229910052796 boron Inorganic materials 0.000 claims abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 15
- 150000002910 rare earth metals Chemical class 0.000 claims description 15
- 229910052721 tungsten Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052735 hafnium Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 64
- 239000010959 steel Substances 0.000 abstract description 64
- 230000003647 oxidation Effects 0.000 abstract description 40
- 238000007254 oxidation reaction Methods 0.000 abstract description 40
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 abstract description 12
- 239000010960 cold rolled steel Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 229910052720 vanadium Inorganic materials 0.000 abstract description 11
- 238000005096 rolling process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 13
- 230000007423 decrease Effects 0.000 description 13
- 239000003054 catalyst Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 241000264877 Hippospongia communis Species 0.000 description 7
- 229910052750 molybdenum Inorganic materials 0.000 description 7
- 238000005219 brazing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052758 niobium Inorganic materials 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- 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
-
- 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
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- 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 by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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
-
- 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
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- 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
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- 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
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- 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
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- 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
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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- 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
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- 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
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- 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
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- 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
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- 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 by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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 by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
Definitions
- the present invention relates to a stainless steel plate and a stainless steel foil formed by rolling the stainless steel plate.
- Fe-Cr-Al stainless steel has excellent oxidation resistance at high temperatures, so it is processed into stainless steel foil and used as a catalyst for exhaust gas purification equipment for automobiles, motorcycles, marine bikes, motor boats, large lawn mowers, small generators, etc. Used for carriers (metal honeycombs).
- This metal honeycomb has a honeycomb structure in which, for example, flat stainless steel foil (flat foil) and corrugated stainless steel foil (wave foil) are alternately stacked, and the foils are fixed by brazing or the like. Yes. Furthermore, what applied the catalyst substance to the surface of this stainless steel foil is used for an exhaust gas purification apparatus.
- Stainless steel foil for metal honeycomb has not only excellent oxidation resistance at high temperatures, but also excellent brazability during honeycomb molding, and its shape does not change even when used at high temperatures.
- the layer may be peeled off or the pores of the honeycomb may be crushed to make it difficult for the exhaust gas to pass through.
- Fe-Cr-Al stainless steels which are excellent in these characteristics, are being applied to a wide range of fields such as heaters, heaters and heaters in the form of thin plates in addition to metal honeycombs.
- Fe-Cr-Al stainless steel is inferior to other stainless steels in the toughness of intermediate materials (such as hot-rolled steel sheet and cold-rolled steel sheet) for foil production.
- intermediate materials such as hot-rolled steel sheet and cold-rolled steel sheet
- Fe-Cr-Al stainless steel is a steel that is difficult to manufacture due to the occurrence of operational troubles and low yields due to frequent plate breaks during annealing, descaling or cold rolling of hot-rolled steel sheets. It is.
- Patent Document 1 or Patent Document 2 includes adding Ti and Nb to add C and N in the steel.
- Patent Document 3 Ti and Nb are added to ferritic stainless steel, C and N in the steel are fixed, and V and B are added in appropriate amounts to further improve the deep drawability of hot-rolled steel sheets and the resistance to processing.
- a technique for improving the surface roughness (resistance) is disclosed.
- Patent Document 2 when Nb is added excessively, (Fe, Al) NbO 4 having no oxidation resistance is generated in the oxide film, and the oxidation resistance is remarkably lowered.
- Ti and Nb oxides have a large coefficient of thermal expansion, there is a problem that the flat and corrugated foils are deformed when used at a high temperature to cause peeling of the supported catalyst layer.
- the method of adding a large amount of stabilizing elements such as Nb and Ti improves the toughness of hot-rolled steel sheets and cold-rolled steel sheets, but has a problem that the oxidation resistance characteristics and shape stability at high temperatures are greatly reduced. is there.
- V and B are added for improving the deep drawability of the hot-rolled steel sheet, and no study has been made on improving the toughness of the Fe—Cr—Al stainless steel.
- the object of the present invention is to improve the productivity by improving the toughness of hot-rolled steel sheets and cold-rolled steel sheets without impairing the oxidation resistance at high temperatures and the shape stability when used at high temperatures. It is providing the stainless steel foil formed by rolling a steel plate and the said stainless steel plate.
- the present inventors diligently studied to achieve the above object, and as a result, in the Fe—Cr—Al series stainless steel, V and B are added in a specific range, whereby oxidation resistance at high temperature and high temperature use are achieved. It has been found that a stainless steel plate having excellent toughness can be obtained without reducing the shape stability at the time.
- the present invention has been made based on such knowledge and is summarized as follows.
- the stainless steel according to (1) further containing at least one of Ca: 0.0002 to 0.0100% and Mg: 0.0002 to 0.0100% by mass%. steel sheet.
- at least one of Mo: 0.5 to 6.0% and W: 0.5 to 6.0% should be contained in a total of 0.5 to 6.0%.
- a stainless steel plate excellent in toughness, oxidation resistance at high temperature and shape stability can be obtained.
- the stainless steel foil manufactured using this stainless steel plate is also excellent in high temperature oxidation resistance and shape stability.
- the stainless steel plate and the stainless steel foil of the present invention are suitable not only for catalyst carriers for exhaust gas purification apparatuses such as automobiles, motorcycles, marine bikes, snowmobiles, and ships, but also for other combustion gas exhaust system members.
- the component composition of the steel constituting the stainless steel plate and stainless foil of the present invention will be described in detail.
- the stainless steel plate and the stainless steel foil of the present invention the stainless steel plate is excellent in toughness, and even when the stainless steel foil is used at a high temperature, the stainless steel foil exhibits sufficient oxidation resistance and hardly deforms.
- the reasons for limiting the component composition of stainless steel sheets and stainless steel foils are as follows.
- the C content is 0.020% or less, preferably 0.015% or less. More preferably, it is 0.010% or less.
- the amount of C may be 0%, but it is preferable that the amount of C be 0.002% or more because extremely reducing the amount of C takes time for refining and makes production difficult.
- the Si content is 1.0% or less, preferably 0.5% or less. More preferably, it is 0.2% or less. However, if the content is less than 0.01%, refining becomes difficult. Therefore, the Si content is preferably 0.01% or more.
- the Mn content is 1.0% or less, preferably 0.5% or less. More preferably, it is 0.15% or less. However, since refining becomes difficult when the Mn content is less than 0.01%, the Mn content is preferably 0.01% or more.
- the P content is 0.040% or less, preferably 0.030% or less. It is more preferable to reduce the P content as much as possible.
- the S content is 0.004% or less, preferably 0.003% or less. More preferably, it is 0.002% or less.
- Cr 16.0-30.0% Cr is an indispensable element for ensuring oxidation resistance at high temperatures. If the Cr content is less than 16.0%, sufficient oxidation resistance at high temperatures cannot be ensured. On the other hand, if the Cr content exceeds 30.0%, the toughness of the intermediate material slab and the hot-rolled steel sheet in the production of the stainless steel foil is lowered, and the production of the stainless steel foil becomes difficult. Therefore, the Cr content is 16.0 to 30.0%, preferably 17.0 to 26.0%, more preferably 17.0 to 22.0%.
- Al 2.00 to 6.50%
- Al is an element that significantly improves oxidation resistance by generating an oxide film composed mainly of Al 2 O 3 during high-temperature oxidation (when used as a foil product or the like). The effect is obtained when the Al content is 2.00% or more.
- the Al content is 2.00 to 6.50%, preferably 2.50 to 6.00%.
- the N content is 0.020% or less, preferably 0.010% or less.
- the amount of N may be 0%, but it is preferable that the amount of N be 0.002% or more because extremely reducing the amount of N takes time for refining and makes production difficult.
- Ni 0.05 to 0.50% Ni has the effect of improving the brazing property when forming the catalyst carrier. For this reason, Ni content shall be 0.05% or more. However, Ni is an austenite generating element. When the content exceeds 0.5%, the austenite phase is formed after the oxidation at high temperature proceeds and the Al in the foil is depleted by oxidation. This austenite phase increases the coefficient of thermal expansion of the foil, and causes defects such as constriction and breakage of the foil. Therefore, the Ni content is 0.05 to 0.50%, preferably 0.01 to 0.50%, more preferably 0.10 to 0.20%.
- Cu 0.005 to 0.10%
- Cu precipitates in the steel and has the effect of improving the high temperature strength. For this reason, Cu content shall be 0.005% or more.
- the Cu content is set to 0.005 to 0.10%, preferably 0.005 to 0.05%.
- Ti less than 0.050% Ti content 0.050% or more, Ti oxides large amount mixed in the Al 2 O 3 film, with brazing property is remarkably reduced, and oxidation resistance at high temperatures Shape stability is also reduced. Therefore, the Ti content is less than 0.050%, preferably less than 0.020%. It is more preferable to reduce the Ti content as much as possible.
- Nb less than 0.050%
- the Nb content is 0.050% or more, an unprotected oxide film of (Fe, Al) NbO 4 is formed, and the oxidation resistance at high temperatures is remarkably lowered.
- (Fe, Al) NbO 4 has a high coefficient of thermal expansion, which promotes deformation of the foil and causes catalyst peeling. Therefore, the Nb content is less than 0.050%, preferably less than 0.020%. It is more preferable to reduce the Nb content as much as possible.
- V and B are elements that play an important role in the present invention.
- the inventors of the present invention do not need to add elements that reduce oxidation resistance such as Ti and Nb to an extent that the toughness is increased by adding V and B in an appropriate range to the Fe—Cr—Al stainless steel.
- the present inventors have found that the toughness of hot-rolled steel sheets and cold-rolled steel sheets can be improved. In order to obtain such an effect, V: 0.010 to 0.050%, B: 0.0001 to 0.0050%, and V% / B%> 10 must be satisfied.
- V suppresses grain growth during annealing, refines recrystallized grains, and improves the toughness of hot-rolled and cold-rolled steel sheets.
- the reason why such an effect can be obtained may be a pinning effect due to fine precipitation of V carbonitride or an effect of preventing recrystallized grains from coarsening due to solute V.
- B concentrates at the grain boundaries to reduce grain boundary energy and suppress precipitation of grain boundary Cr carbonitrides that contribute to lowering the toughness of hot-rolled steel sheets and cold-rolled annealed steel sheets To do. However, it is considered that when the concentration to the grain boundary proceeds excessively, B precipitates are generated and the toughness is lowered.
- V and B do not exhibit sufficient effects when precipitated as nitrides.
- the stainless steel plate of the present invention since it contains a large amount of Al having a strong affinity with N, it is considered that V and B exhibit a sufficient toughness improving effect without being precipitated as nitrides.
- V and B in an amount of 0.010% or more and 0.0001% or more, respectively.
- V exceeds 0.050%
- B exceeds 0.005%
- the toughness decreases. Therefore, V: 0.010 to 0.050% and B: 0.0001 to 0.0050%.
- V% / B% V content / B content
- V% / B%> 20 when manufacturing in an environment with a low sheet temperature, it is preferable to satisfy V% / B%> 20 because it is necessary to further improve the toughness of the hot-rolled steel sheet and the cold-rolled steel sheet.
- the stainless steel plate of the present invention further comprises Zr: 0.005 to 0.200%, Hf: 0.005 to 0.200%, REM: 0.01 to 0.20%. Among them, at least one kind is contained.
- the Al 2 O 3 oxide film formed on Fe—Cr—Al stainless steel not containing these components has poor adhesion to the base iron. For this reason, the Al 2 O 3 oxide film peels off every time the temperature is changed from high to low during use, and good oxidation resistance cannot be obtained.
- Zr, Hf or REM has the effect of improving the adhesion resistance of the Al 2 O 3 oxide film and preventing its peeling and improving the oxidation resistance.
- Appropriate amounts of Zr, Hf, and REM have the effect of reducing the growth rate of the Al 2 O 3 film, and further improving the oxidation resistance.
- Zr also has the effect of fixing C and N in stainless steel and improving toughness.
- Zr 0.005 to 0.200%
- Zr improves the adhesion of the Al 2 O 3 oxide film and reduces the growth rate to improve the oxidation resistance.
- Zr fixes C and N and improves toughness. These effects are obtained when the Zr content is 0.005% or more.
- the Zr content exceeds 0.20%, a large amount of Zr oxide is mixed in the Al 2 O 3 oxide film, the growth rate of the oxide film increases, and the oxidation resistance decreases.
- Zr forms an intermetallic compound with Fe and the like, and lowers the toughness of stainless steel. Therefore, the Zr content is set to 0.005 to 0.200%, preferably 0.020 to 0.100%.
- Hf 0.005 to 0.200% Hf improves the adhesion of the Al 2 O 3 oxide film to steel and reduces its growth rate to improve oxidation resistance. The effect is obtained when the Hf content is 0.005% or more. However, if the Hf content exceeds 0.200%, a large amount of Hf oxide is mixed in the Al 2 O 3 oxide film, the growth rate of the oxide film is increased, and the oxidation resistance is lowered. Further, Hf forms an intermetallic compound with Fe or the like, and reduces toughness. Accordingly, the Hf content is 0.005 to 0.200%, preferably 0.020 to 0.100%.
- REM rare earth metals: 0.01-0.20% REM refers to Sc, Y, and lanthanoid elements (elements having atomic numbers of 57 to 71 such as La, Ce, Pr, Nd, and Sm). REM improves the adhesion of the Al 2 O 3 oxide film has a very significant effect on peeling resistance improving Al 2 O 3 oxide film in an environment that is repeatedly oxidized. For this reason, REM is particularly preferably contained when excellent oxidation resistance is required. In order to obtain such an effect, the REM content needs to be 0.01% or more in total. On the other hand, when the content of REM exceeds 0.20%, hot workability is deteriorated and it becomes difficult to manufacture a hot-rolled steel sheet. Therefore, the REM content is set to 0.01 to 0.20%, preferably 0.03 to 0.10%. For the addition of REM, a metal (such as a misch metal) that has not been separated and purified can be used for cost reduction.
- a metal such as a
- the stainless steel plate of the present invention preferably further contains a predetermined amount of at least one selected from Ca and Mg.
- Ca 0.0002 to 0.0100%
- Mg 0.0002 to 0.0100%
- An appropriate amount of Ca or Mg improves the oxidation resistance by improving the adhesion of the Al 2 O 3 oxide film to the steel and reducing the growth rate. In the case of single addition, this effect is obtained when the Ca content is 0.0002% or more and the Mg content is 0.0002% or more. More preferably, the Ca content is 0.0010% or more, and the Mg content is 0.0015% or more. However, when these elements are added excessively, the toughness and oxidation resistance are lowered. Therefore, when added alone, Ca and Mg are each preferably 0.0100% or less, more preferably 0.0050% or less. And
- the steel used in the present invention preferably further contains a predetermined amount of at least one selected from Mo and W.
- the total content of Mo and W is 0.5% to 6.0% Mo and W increase the high temperature strength. For this reason, Mo and W extend the life of the catalyst carrier when a stainless steel plate or a stainless steel foil is used as the catalyst carrier. This effect is obtained when the total content of Mo and W is 0.5% or more. On the other hand, if the total content of Mo and W exceeds 6.0%, it becomes difficult to produce a stainless steel foil due to a decrease in workability. Therefore, the total content of Mo and W is 0.5 to 6.0%, preferably 2.5 to 5.5%.
- the remainder other than the above is Fe and inevitable impurities.
- inevitable impurities include Co, Zn, Sn, and the like.
- the content of these elements is preferably 0.3% or less.
- the stainless steel plate is a steel plate having the above component composition.
- the production method is not particularly limited.
- steel having the above composition is melted in a converter or electric furnace, refined with VOD, AOD, etc., and then slabd by block rolling or continuous casting. Examples thereof include a method of heating to a temperature of 1050 to 1250 ° C. and hot rolling.
- the stainless steel plate of the present invention has been subjected to sandblasting, steel grid blasting (steel grid blasting), alkaline degreasing, pickling treatment, etc. in order to remove scales and contaminants on the steel surface.
- the hot-rolled steel sheet may be used.
- the stainless steel plate of the present invention may be a cold rolled steel plate obtained by cold rolling the hot rolled steel plate.
- the stainless steel foil of the present invention is produced by rolling the stainless steel plate of the present invention. Usually, a hot-rolled steel sheet from which surface scales, contaminants, and the like have been removed is cold-rolled, and annealing and cold-rolling are repeated to produce a stainless steel foil having a desired thickness.
- the thickness of the stainless steel foil is not particularly limited, but when the stainless steel foil of the present invention is applied to a catalyst carrier for an exhaust gas purifying device, the exhaust resistance is lowered, so that the thinner the thickness, the more advantageous.
- the exhaust gas purifying device catalyst carrier is used in a harsher environment than other applications, and there may be a problem that the stainless steel foil is cut or broken.
- the thickness of the stainless steel foil is preferably 20 to 200 ⁇ m.
- the catalyst carrier for exhaust gas purifying apparatus may be required to have excellent vibration resistance and durability. In this case, the thickness of the stainless steel foil is preferably about 100 to 200 ⁇ m.
- the catalyst carrier for exhaust gas purification apparatus may be required to have a high cell density and low back pressure. In this case, the thickness of the stainless steel foil is more preferably about 20 to 100 ⁇ m.
- a steel having the chemical composition shown in Table 1 melted in a 50 kg small vacuum melting furnace was heated to 1200 ° C. and hot-rolled in a temperature range of 900 to 1200 ° C. to obtain a hot-rolled steel plate having a thickness of 3 mm.
- Steel No. 1 in Table 1 whose Al content exceeds the range of the present invention. In No. 20, cracks occurred during hot rolling, a sound hot-rolled steel sheet could not be obtained, and a foil could not be produced. Therefore, no evaluation test was conducted.
- Steel No. The hot-rolled steel sheet except 20 was annealed in the atmosphere at 900 ° C.
- the surface scale was removed by pickling, and then cold-rolled to a thickness of 1.0 mm to obtain a cold-rolled steel sheet. Thereafter, cold rolling and annealing by a cluster mill were repeated a plurality of times to obtain a stainless steel foil having a width of 100 mm and a foil thickness of 50 ⁇ m.
- the hot-rolled steel sheet and the stainless steel foil thus obtained were evaluated for the toughness of the hot-rolled steel sheet, the oxidation resistance at high temperatures and the shape stability of the stainless steel foil, respectively.
- (1) Toughness of hot-rolled steel sheet The toughness of the hot-rolled steel sheet was evaluated by a Charpy impact test. The test piece was prepared based on a V-notch test piece of JIS standard (JIS Z 2202 (1998)). Only the plate thickness (width in JIS standard) was set to 3 mm without any processing. The specimen was taken so that the longitudinal direction was parallel to the rolling direction, and a notch was made perpendicular to the rolling direction.
- the test was performed three times at each temperature based on the JIS standard (JIS Z 2242 (1998)), the absorption energy and the brittle fracture surface ratio were measured, and the transition curve was obtained.
- the ductile-brittle transition temperature (DBTT) was set to a temperature at which the brittle fracture surface ratio was 50%.
- a DBTT of less than 120 ° C. was evaluated as “ ⁇ ” (excellent), a temperature of 120 ° C. to 150 ° C. was evaluated as “ ⁇ ” (good), and a sample having a DBTT exceeding 150 ° C. was evaluated as “x” (bad). If the DBTT determined by the Charpy impact test is 150 ° C. or less, it was confirmed in advance that cold rolling can be stably performed at room temperature.
- the DBTT is less than 120 ° C. because the plate can be passed more stably.
- Nos. 14 to 20 are inferior to at least one of the toughness of the hot-rolled steel sheet, the oxidation resistance at high temperatures of the foil, and the shape stability. From the above results, according to the present invention, it is possible to obtain stainless steel and stainless steel foil having excellent toughness and excellent Fe—Cr—Al oxidation resistance.
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Abstract
Description
(2) さらに、質量%で、Ca:0.0002~0.0100%、Mg:0.0002~0.0100%のうち少なくとも1種を含有することを特徴とする(1)に記載のステンレス鋼板。
(3) さらに、質量%で、Mo:0.5~6.0%、W:0.5~6.0%のうち、少なくとも1種を合計で0.5~6.0%含有することを特徴とする(1)~(2)のいずれか1項に記載のステンレス鋼板。
(4) (1)~(3)のいずれか1項に記載の成分組成を有し、板厚が200μm以下であるステンレス箔。
C含有量が0.020%を超えると、熱延鋼板や冷延鋼板の靭性が低下してステンレス箔の製造が困難になる。このため、C含有量は0.020%以下、好ましくは0.015%以下とする。さらに好ましくは0.010%以下とする。C量は0%でもよいが、C量を極度に低下させることは精錬の時間がかかり製造が困難になるので、0.002%以上とすることが好ましい。
Si含有量が1.0%を超えると、熱延鋼板や冷延鋼板の靭性が低下してステンレス箔の製造が困難になる。このためSi含有量は1.0%以下、好ましくは0.5%以下とする。さらに好ましくは0.2%以下とする。ただし、0.01%未満にしようとすると精錬が困難になるので、Siの含有量は0.01%以上であることが好ましい。
Mn含有量が1.0%を超えると、鋼の耐酸化性が失われる。このためMn含有量は1.0%以下、好ましくは0.5%以下とする。さらに好ましくは0.15%以下とする。ただし、Mn含有量を0.01%未満にしようとすると精錬が困難になるので、Mn含有量は0.01%以上であることが好ましい。
P含有量が0.040%を超えると、鋼の靭性および延性が低下してステンレス箔の製造が困難になる。このためP含有量は0.040%以下、好ましくは0.030%以下とする。P含有量は極力低減することがより好ましい。
S含有量が0.004%を超えると、熱間加工性が低下して熱延鋼板の製造が困難になる。このためS含有量は0.004%以下、好ましくは0.003%以下とする。より好ましくは0.002%以下とする。
Crは高温での耐酸化性を確保する上で必要不可欠な元素である。Cr含有量が16.0%未満では、高温での十分な耐酸化性を確保できない。一方、Cr含有量が30.0%を超えると、ステンレス箔の製造における中間素材のスラブや熱延鋼板の靭性が低下して、ステンレス箔の製造が困難になる。このためCr含有量は16.0~30.0%、好ましくは17.0~26.0%、さらに好ましくは17.0~22.0%とする。
Alは高温酸化時(箔製品等としての使用時)にAl2O3を主成分とする酸化皮膜を生成させて耐酸化性を著しく向上させる元素である。Al含有量が2.00%以上でその効果が得られる。一方、Al含有量が6.50%を超えると、鋼の靭性の低下によりステンレス箔の製造が困難になる。このためAl含有量は2.00~6.50%、好ましくは2.50~6.00%とする。
N含有量が0.020%を超えると、鋼の靱性が低下してステンレス箔の製造が困難になる。このためN含有量は0.020%以下、好ましくは0.010%以下とする。N量は0%でもよいが、N量を極度に低下させることは精錬の時間がかかり製造が困難になるので、0.002%以上とすることが好ましい。
Niは触媒担体成形時のロウ付け性を向上させる効果がある。このため、Ni含有量は0.05%以上とする。しかし、Niはオーステナイト生成元素である。その含有量が0.5%を超える場合は、高温での酸化が進んで箔中のAlが酸化により枯渇した後にオーステナイト相が生成するようになる。このオーステナイト相は箔の熱膨張係数を大きくして、箔の括れや破断などの不具合を発生させる。このためNi含有量は0.05~0.50%、好ましくは0.01~0.50%、より好ましくは0.10~0.20%とする。
Cuは、鋼中に析出し高温強度を向上させる効果がある。このため、Cu含有量は0.005%以上とする。一方、0.10%を超えて添加すると鋼の靭性が低下する。このためCu含有量は0.005~0.10%、好ましくは0.005~0.05%とする。
Ti含有量が0.050%以上では、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、高温での耐酸化性および形状安定性も低下する。よって、Ti含有量は0.050%未満、好ましくは0.020%未満とする。Ti含有量は極力低減することがより好ましい。
Nb含有量が0.050%以上では、(Fe,Al)NbO4の保護性のな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。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0.050%未満、好ましくは0.020%未満とする。Nb含有量は極力低減することがより好ましい。
VおよびBは、本発明において重要な役割を果たす元素である。本発明者らは、Fe-Cr-Al系ステンレス鋼に、VおよびBを適正な範囲で含有させることで、TiやNbといった耐酸化性を低下させる元素を靭性が高まるほど含有させなくても、熱延鋼板および冷延鋼板の靭性が改善可能となることを見出した。このような効果を得るには、V:0.010~0.050%、B:0.0001~0.0050%、かつV%/B%>10を満たさなければならない。このような効果が得られる理由については以下の(1)~(3)にように推察される。
(1)Vは焼鈍時の粒成長を抑制して再結晶粒を微細化させて、熱延焼鈍鋼板や冷延鋼板の靭性を向上させる。このような効果が得られる理由として、V炭窒化物の微細析出によるピン止め効果(pinning effect)または固溶Vによる再結晶粒の粗大化防止効果が考えられる。
(2)Bは結晶粒界に濃化することで粒界エネルギーを低下させ、熱延鋼板の靭性や冷延焼鈍鋼板の靭性を低下させる一因となる粒界Cr炭窒化物の析出を抑制する。しかし、粒界への濃化が過度に進むと逆にB析出物が生成して靭性を低下させると考えられる。
(3)V含有量とB含有量の質量比(V%/B%)によって上記の効果が変化する理由は、V含有量で粒界面積が変化することにより、粒界に濃化するB量に影響を与えるため、V含有量とB含有量の間に最適な比が存在するためであると考えられる。
Zrは、Al2O3酸化皮膜の密着性を改善するとともにその成長速度を低減して耐酸化性を向上させる。また、ZrはC、Nを固定して靭性を向上させる。これらの効果はZr含有量が0.005%以上で得られる。しかし、Zr含有量が0.20%を超えると、Zr酸化物がAl2O3酸化皮膜中に多量に混入して酸化皮膜の成長速度が増加して耐酸化性が低下する。また、ZrはFeなどと金属間化合物をつくり、ステンレス鋼の靭性を低下させる。よって、Zr含有量は0.005~0.200%、好ましくは0.020~0.100%とする。
Hfは、Al2O3酸化皮膜の鋼に対する密着性を改善するとともにその成長速度を低減して耐酸化性を向上させる。その効果はHf含有量が0.005%以上で得られる。しかし、Hf含有量が0.200%を超えると、Hf酸化物がAl2O3酸化皮膜中に多量に混入して酸化皮膜の成長速度が増加して耐酸化性が低下する。また、Hfは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、Hf含有量は0.005~0.200%、好ましくは0.020~0.100%とする。
REMとは、Sc、Yおよびランタノイド系元素(La、Ce、Pr、Nd、Smなど原子番号57~71までの元素)をいう。REMはAl2O3酸化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酸化皮膜の耐剥離性向上に極めて顕著な効果を有する。このため、REMは優れた耐酸化性が求められる場合に含有することが特に好ましい。このような効果を得るには、REM含有量を合計で0.01%以上とする必要がある。一方、REMの含有量が0.20%を超えると、熱間加工性が低下して熱延鋼板の製造が困難になる。よって、REMの含有量は0.01~0.20%、好ましくは0.03~0.10%とする。なお、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(misch metal)等)を用いることもできる。
適量のCaあるいはMgは、Al2O3酸化皮膜の鋼に対する密着性の向上と成長速度の低減により耐酸化性を向上させる。この効果は、単独添加の場合、Ca含有量が0.0002%以上、Mg含有量が0.0002%以上で得られる。さらに好ましくは、Ca含有量は0.0010%以上、Mg含有量は0.0015%以上である。しかし、これら元素を過剰に添加すると靭性の低下や耐酸化性の低下が起こるため、単独添加の場合、Ca、Mgは、それぞれ0.0100%以下が好ましく、さらに好ましくはそれぞれ0.0050%以下とする。
MoおよびWは高温強度を増大させる。このため、MoおよびWは、ステンレス鋼板もしくはステンレス箔を触媒担体として用いたとき、触媒担体の寿命を伸ばす。この効果は、MoおよびWの合計の含有量が0.5%以上で得られる。一方、MoおよびWの合計の含有量で6.0%を超えると、加工性の低下によりステンレス箔の製造が困難になる。よって、MoおよびWは合計の含有量が0.5~6.0%、好ましくは2.5~5.5%である。
(1)熱延鋼板の靭性
熱延鋼板の靭性はシャルピー衝撃試験により評価した。試験片はJIS規格(JIS Z 2202(1998))のVノッチ試験片に基づき作製した。板厚(JIS規格では幅)のみ素材のまま加工を加えず3mmとした。試験片の長手方向が圧延方向と平行になるように採取し、圧延方向と垂直にノッチを入れた。試験は、JIS規格(JIS Z 2242(1998))に基づき、各温度につき3本ずつ行い、吸収エネルギーおよび脆性破面率を測定し遷移曲線を求めた。延性-脆性遷移温度(DBTT(ductile-brittle transition temperature))は脆性破面率が50%となる温度とした。DBTTが120℃未満を「◎」(優れる)、120℃以上~150℃以下を「○」(良好)、150℃を超えたものを「×」(不良)と評価した。シャルピー衝撃試験(Charpy impact test)で求めたDBTTが150℃以下であれば、常温で安定的に冷間圧延が可能であることは事前に確認した。冬場の通板など板温が低下しやすい環境では、DBTTが120℃未満であることが、より安定的に通板できるという理由で好ましい。
(2)ステンレス箔の高温での耐酸化性
箔厚50μmのステンレス箔に、1200℃で30分間保持する熱処理(拡散接合あるいはロウ付け接合時の熱処理に相当する処理)を5.3×10―3Pa以下の真空中で行った。熱処理後のステンレス箔より20mm幅×30mm長さの試験片を3枚採取した。これらを、大気雰囲気中1100℃で400時間保持する熱処理で酸化させ、3枚の平均の酸化増量(加熱前後質量変化を初期の表面積で除した量)を測定した。このとき、各試料に酸化皮膜の剥離(spalling)は見られなかった。平均の酸化増量の測定結果は、10g/m2以下を「◎」(優れる)、10g/m2超え15g/m2以下を「○」(良好)、15g/m2超えを「×」(不良)とし、「◎」あるいは「○」であれば本発明の目的を満足する。
(3)ステンレス箔の高温での形状安定性
箔厚50μmのステンレス箔に、1200℃で30分間保持する熱処理(拡散接合あるいはロウ付け接合時の熱処理に相当する処理)を5.3×10―3Pa以下の真空中で行った。熱処理後の箔より採取した100mm幅×50mm長さの箔を、長さ方向に直径5mmの円筒状に丸め、端部をスポット溶接により留めたものを3本作製した。これらを、大気雰囲気中1100℃で400時間保持する熱処理で酸化させ、3個の平均の長さ変化量(加熱前の円筒長さに対する加熱後の円筒長さの増分の割合)を測定した。平均の長さ変化量の測定結果は、3%以下を「◎」(優れる)、3%超え5%以下を「○」(良好)、5%超えを「×」(不良)とし、「○」あるいは「◎」であれば本発明の目的を満足する。
Claims (4)
- 質量%で、C:0.020%以下、Si:1.0%以下、Mn:1.0%以下、P:0.040%以下、S:0.004%以下、Cr:16.0~30.0%、Al:2.00~6.50%、N:0.020%以下、Ni:0.05~0.50%、Cu:0.005~0.10%、Ti:0.050未満、Nb:0.050未満、V:0.010~0.050%、B:0.0001~0.0050%を含有し、
さらに、Zr:0.005~0.200%、Hf:0.005~0.200%、REM(希土類元素、rare earth metals):0.01~0.20%のうち少なくとも1種を含有し、残部がFeおよび不可避的不純物からなり、
{Vの含有量(V%)}/{Bの含有量(B%)}>10を満たすことを特徴とするステンレス鋼板。 - さらに、質量%で、Ca:0.0002~0.0100%、Mg:0.0002~0.0100%のうち少なくとも1種を含有することを特徴とする請求項1に記載のステンレス鋼板。
- さらに、質量%で、Mo:0.5~6.0%、W:0.5~6.0%のうち、少なくとも1種を合計で0.5~6.0%含有することを特徴とする請求項1~2のいずれか1項に記載のステンレス鋼板。
- 請求項1~3のいずれかに記載の成分組成を有し、板厚が200μm以下であるステンレス箔。
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US14/650,117 US9777357B2 (en) | 2012-12-17 | 2013-12-05 | Stainless steel foil |
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EP2933349A1 (en) | 2015-10-21 |
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US9777357B2 (en) | 2017-10-03 |
JPWO2014097562A1 (ja) | 2017-01-12 |
KR101699646B1 (ko) | 2017-01-24 |
JP5561447B1 (ja) | 2014-07-30 |
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US20150299833A1 (en) | 2015-10-22 |
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