WO2010010916A1 - Acier inoxydable ferritique destiné à être utilisé pour la production d'un réservoir d'eau-urée - Google Patents

Acier inoxydable ferritique destiné à être utilisé pour la production d'un réservoir d'eau-urée Download PDF

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WO2010010916A1
WO2010010916A1 PCT/JP2009/063169 JP2009063169W WO2010010916A1 WO 2010010916 A1 WO2010010916 A1 WO 2010010916A1 JP 2009063169 W JP2009063169 W JP 2009063169W WO 2010010916 A1 WO2010010916 A1 WO 2010010916A1
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less
urea water
stainless steel
effective
amount
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PCT/JP2009/063169
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English (en)
Japanese (ja)
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信彦 平出
治彦 梶村
高橋　明彦
滋 前田
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新日鐵住金ステンレス株式会社
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Priority to EP20090800430 priority Critical patent/EP2316979A4/fr
Priority to JP2010521733A priority patent/JP5588868B2/ja
Priority to US12/737,425 priority patent/US20110110812A1/en
Priority to CN200980128401.2A priority patent/CN102099500B/zh
Publication of WO2010010916A1 publication Critical patent/WO2010010916A1/fr

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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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/02—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
    • C22C38/001—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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention is mainly an apparatus for reducing NO x of the urea water with the exhaust gas in an internal combustion engine consisting mainly of diesel engines, equipment used specifically in automobiles urea SCR (Selective Catalytic Reduction) system, specifically Relates to a ferritic stainless steel used in a urea water tank used for storing, manufacturing or transporting urea water.
  • an internal combustion engine consisting mainly of diesel engines, equipment used specifically in automobiles urea SCR (Selective Catalytic Reduction) system, specifically Relates to a ferritic stainless steel used in a urea water tank used for storing, manufacturing or transporting urea water.
  • the urea SCR system is one of NO x reduction systems and uses urea water as a reducing agent for NO x .
  • urea water Compared to the case of using liquid ammonia or aqueous ammonia as a reducing agent, urea water has the advantage of being safe and relatively easy to handle.
  • application to NO x reduction system has been studied.
  • urea water injected into exhaust gas is decomposed by heat and moisture to generate ammonia, and ammonia and NO x are selectively reduced on the catalyst and decomposed into harmless nitrogen.
  • the urea water used at this time is an aqueous urea solution having a high concentration of 25 to 45%.
  • an aqueous urea solution having a lowest freezing point of about 32.5% is generally used.
  • “diesel engine NO x reducing additive-AUS32—part 1: properties” The automobile standard JASO E502 is also defined in the same rule).
  • the concentration of the impurity element is also strictly defined.
  • Fe ⁇ 0.5, Cr: ⁇ 0.2, Ni: ⁇ 0.2, Cu: ⁇ 0. 2 (both units are mg / kg).
  • the material used for the urea water tank is very Excellent corrosion resistance is required. Further, it is often used outdoors as represented by automobiles and used for a long period of 10 years or more. Therefore, there is a possibility that urea water in the tank leaks due to erosion by rainwater, sea salt particles, or the like. Leakage of the urea water, it is necessary to avoid the fact that there is a risk of losing the function of the NO x reduction system. Therefore, the material used for the urea water tank needs to have excellent corrosion resistance against salt damage from the outer surface side.
  • Patent Document 1 discloses a high-grade urea water supply device and a high-grade urea water supply method using the device, and includes a high-grade urea water supply port with an air vent mechanism and a discharge hose with a gun nozzle.
  • a supply device is shown which comprises an IBC (Intermediate Bulk Bulk Container) tank made of high density polyethylene having an electric pump and having an actual capacity of 1200 to 1500 L.
  • IBC Intermediate Bulk Bulk Container
  • a reinforced plastic is preferable as the electric pump
  • a stainless alloy SUS304
  • Hastelloy Hastelloy
  • Inconel alloy is preferable for the pump shaft.
  • SUS304 is an austenitic stainless steel and is not described directly with respect to ferritic stainless steel.
  • Patent Document 2 discloses a duplex stainless steel for a urea production plant, a welding material, a urea production plant and its equipment, Cr: 26% to less than 28%, Ni: 6 to 10%, Mo: 0 Duplex stainless steels are shown that contain .2 to 1.7% and W: greater than 2% and less than 3%.
  • Urea is synthesized using ammonia and carbon dioxide as raw materials under high temperature and high pressure, but due to the presence of synthetic reaction intermediate products such as ammonium carbamate, it has severe corrosivity, so it can withstand thinning due to corrosion and leak internal materials. A material that does not allow it to be used is required.
  • the high-concentration urea water environment used near room temperature such as the urea SCR system is milder than the high-temperature and high-pressure corrosive environment in the urea synthesis plant because of its low temperature and the absence of synthesis reaction intermediate products.
  • corrosion resistance against salt damage caused by rainwater or sea salt particles is required.
  • Patent Document 3 discloses a ferritic stainless steel having excellent brazing properties. It is disclosed that this ferritic stainless steel has a complicated shape such as a urea water tank used in an automobile urea SCR system, and is suitable for a member manufactured by brazing joint.
  • the present invention is mainly an apparatus for reducing NO x in exhaust gas by using urea water in an internal combustion engine consisting mainly of diesel engines, equipment used specifically in automobiles urea SCR system, specifically, urea water
  • the purpose of the present invention is to provide a ferritic stainless steel which is suitable for a urea water tank used when storing, manufacturing or transporting, and has a small elution of constituent elements in high-concentration urea water and excellent salt corrosion resistance. To do.
  • the present inventors have reduced elution of constituent elements from steel into a 25-45% high concentration urea aqueous solution on the inner surface side, and on the outer surface side.
  • the present inventors have dissolved a passive film formed on the steel surface in 25-45% high-concentration urea water used in urea water tanks. It was found that a uniform passive film can be formed that can suppress the elution from the steel that is the base of the passive film through the passive film (Japanese Patent Application No. 2008-62598). On the other hand, even in the corrosion resistance against salt damage, forming a uniform passive film that can suppress elution increases the resistance to chloride ions contained in sea salt particles, etc., and suppresses the occurrence of corrosion. is important. Since the outdoor environment is a repeated wet and dry environment, chloride ions concentrate through the drying and wetting process.
  • the lower limit of the Cr amount is 15%.
  • the urea water tank that is the subject of the present invention is often joined and assembled by welding or brazing.
  • An oxide film may be formed on the surface of the steel constituting the welded (or brazed) welded part (or brazed part). Even in the state where the oxide film is formed, it is necessary to suppress elution from the steel in the high-concentration urea water on the inner surface side and to withstand salt damage from the outer surface side. Since ferritic stainless steel diffuses Cr faster than austenitic stainless steel, Cr deficiency directly under the oxide film is suppressed. In order to suppress elution of steel with an oxide film into a high-concentration urea aqueous solution, it is important to have a large amount of Cr immediately below the oxide film. Therefore, ferritic stainless steel is more difficult than austenitic stainless steel. It is possible to suppress elution from the welded portion (or brazed portion) with a smaller amount of Cr.
  • the present inventors have conducted extensive research to secure the amount of Cr immediately below the oxide film, and in the state where the oxide film is formed, the provisions relating to the elution of the constituent elements in the high-concentration urea water (Fe : ⁇ 0.5, Cr: ⁇ 0.2, Ni: ⁇ 0.2, Cu: ⁇ 0.2 (both units are mg / kg)), the following formula (I): It was found that the effective Cr amount represented by the formula (II) or (III) needs to be 10% or more (provided that the element symbol in the formulas (I) to (III) is the content of the element) (% By mass) The numerical value before the element symbol is a constant.) Moreover, it discovered that it was necessary to make the amount of effective Cr 15% or more with respect to salt damage more severe than high concentration urea water.
  • the above formulas (I) to (III) are alloy element indices that take into account the effect of Si, Mn, Ti, and Nb contained in steel on the effect of improving the corrosion resistance of Cr, and are effective in contributing to the improvement of corrosion resistance of steel This is for calculating the effective Cr amount as a numerical value serving as an index of the Cr amount.
  • the effects of Si, Mn, Ti, and Nb listed in the above formulas (I) to (III) are not fully understood, the effects of each element are inferred as follows.
  • Si is a useful element that forms an oxide directly under Cr oxide and suppresses oxidation of Cr.
  • Mn promotes the formation of a spinel oxide containing Cr and Mn and reduces the effective Cr amount.
  • Ti has a great effect of significantly promoting the growth of Cr oxide and reducing the amount of effective Cr. Since Nb has the effect of reducing the Cr oxide growth promoting effect of Ti, it suppresses the decrease in the effective Cr amount due to Ti.
  • the wetting and spreading characteristics of the braze are in a region satisfying Ti-3N ⁇ 0.03, Al ⁇ 0.5%, 10 (Ti-3N) + Al ⁇ 0.5. It turned out to be good.
  • a thick oxide film of Ti and Al with a thickness of several tens to several hundreds nm was found. It was formed like this. It was considered that such film formation hinders the spread of the wetting of the wax.
  • the urea water tank targeted by the present invention also requires strength, and it is desirable that the decrease in strength after brazing is small.
  • brazing at a high temperature of 1000 to 1100 ° C. such as Ni brazing or Cu brazing, it was considered important to suppress a decrease in strength due to crystal grain coarsening.
  • Pinning with precipitates is useful for suppressing coarsening of crystal grains
  • the present inventors utilize carbonitrides of Ti and Nb as precipitates, and the content of C (mass%) + N It was found that by setting the amount (mass%) to 0.015% or more, the precipitation amount and stability of carbonitride useful for suppressing the coarsening of crystal grains are secured (Japanese Patent Application No. 2007-339732). .
  • the present invention provides a ferritic stainless steel for a urea water tank that improves the salt corrosion resistance in addition to the two prior applications, has a small elution into high-concentration urea water, and is excellent in corrosion resistance against salt damage.
  • the gist of the invention is as follows, as described in the claims.
  • any one or two of Nb and Ti are contained in 8 (C + N) to 1% (where C and N indicate the contents (mass%) of C and N, respectively. (The previous numerical value is a constant)), and the balance contains iron and inevitable impurities, and the following formula (I), the following formula (II), or the following formula (III) (where (I) to The element symbol in the formula (III) indicates the content (mass%) of the element, and the numerical value before the element symbol is a constant.) Featuring ferritic stainless steel for urea water tanks.
  • the ferritic stainless steel for urea water tank according to (1) characterized in that (3) Further, by mass%, it contains one or more selected from Ca: 0.002% or less, Mg: 0.002% or less, and B: 0.005% or less.
  • urea water is used in exhaust gas.
  • N An element useful for pitting corrosion resistance, but its content needs to be kept low in order to reduce intergranular corrosion resistance and workability. Therefore, it was made 0.05% or less. However, excessively lowering the scouring cost, it is desirable to make it 0.002% or more.
  • Si An element that is useful as a deoxidizing element and effective in corrosion resistance, but its content is set to 0.02 to 1.5% in order to reduce workability.
  • Mn Useful as a deoxidizing element, but if contained excessively, corrosion resistance deteriorates, so 0.02 to 2% or less.
  • the most important element in the present invention at least 15% or more is required to exhibit extremely low elution into a high-concentration urea aqueous solution and to exhibit excellent corrosion resistance against salt damage. As the content is increased, the elution characteristics are stabilized, but the processability and manufacturability are lowered. For this reason, the upper limit was made 23% or less. Desirably, it is 16% or more, more desirably 18% or more.
  • Nb, Ti The urea water tank targeted in the present invention is often joined and assembled by welding or brazing. Nb and Ti are useful elements, and have the effect of fixing C and N and improving the intergranular corrosion resistance of the welded part (or brazed part). However, since excessive addition adversely affects workability and manufacturability, either one or two of Nb and Ti are contained in the range of 8 (C + N) to 1% (provided that C, N Represents the content (% by mass) of C and N. The numerical values before the element symbols are constants. Desirably, it is 8 (C + N) to 0.6%.
  • the content of Ti is limited so that Ti-3N ⁇ 0.03 is satisfied in order to ensure good brazing properties (however, the formula The element symbol in the figure indicates the content (% by mass) of the element, and the numerical value before the element symbol is a constant.)
  • the value of Ti-3N is desirably 0.02% or less. However, if the Ti content is too low, the workability deteriorates, so it is desirable to adjust the Ti content so that the value of Ti-3N satisfies ⁇ 0.08% or more. When workability is not particularly required, Ti need not be added.
  • Effective Cr amount in the present invention, the effective Cr amount represented by the following formula (I), (II) or (III) is 15% or more (provided that in the formulas (I) to (III))
  • the element symbol indicates the content (% by mass) of the element, and the numerical value before the element symbol is a constant.)
  • Nb Effective Cr amount Cr + 4Si-2Mn
  • Ti Effective Cr amount Cr + 4Si-2Mn-10Ti
  • Nb and Ti Effective Cr amount Cr + 4Si-2Mn- (10Ti-3Nb) (III)
  • the effective Cr amount calculated by the above formulas (I) to (III) is the Cr immediately below the oxide film in the state where the oxide film is formed on the surface of the steel as in the case where the steel is welded or brazed.
  • the elution into the high-concentration urea water is extremely small.
  • corrosion damage resistance on the outer surface is required, and in order to achieve compatibility with the corrosion resistance in high-concentration urea water, it is necessary to be 15% or more. Desirably, it is 16% or more, more desirably 18% or more.
  • Mo 3% or less can be contained as necessary to improve corrosion resistance. It is 0.3% or more that a stable effect can be obtained. Excessive addition degrades the workability and leads to an increase in cost because it is expensive. Therefore, it is desirable to contain 0.3 to 3%.
  • Ni 3% or less can be contained as required to improve corrosion resistance. It is 0.2% or more that a stable effect is obtained. Excessive addition degrades the workability and leads to an increase in cost because it is expensive. Therefore, it is desirable to contain 0.2 to 3%.
  • Cu 3% or less can be contained as necessary to improve corrosion resistance. It is 0.2% or more that a stable effect is obtained. Excessive addition degrades the workability and leads to an increase in cost because it is expensive. Therefore, it is desirable to contain 0.2 to 3%.
  • V 3% or less can be contained if necessary for improving the corrosion resistance. It is 0.2% or more that a stable effect is obtained. Excessive addition degrades the workability and leads to an increase in cost because it is expensive. Therefore, it is desirable to contain 0.2 to 3%.
  • W 5% or less can be contained as necessary to improve corrosion resistance. It is 0.5% or more that a stable effect is obtained. Excessive addition degrades the workability and leads to an increase in cost because it is expensive. Therefore, it is desirable to contain 0.5 to 5%.
  • Ca An element having a deoxidizing effect and the like and useful for scouring, and is contained in an amount of 0.002% or less as necessary. When contained, it is desirable to contain 0.0002% or more in order to obtain a stable effect.
  • Mg An element having a deoxidizing effect and the like and useful for scouring, and also useful for improving the workability and toughness by refining the structure. For this reason, it is made to contain 0.002% or less as needed. When contained, it is desirable to contain 0.0002% or more in order to obtain a stable effect.
  • B An element useful for improving the secondary workability, and is contained in an amount of 0.005% or less as necessary. When contained, it is desirable to contain 0.0002% or more in order to obtain a stable effect.
  • C + N When brazing joint is used for assembling the urea water tank, C + N is 0.015% or more, and preferably 0.02 from the viewpoint of suppressing the strength reduction accompanying the coarsening of crystal grains during brazing. % Or more. Since excessive addition of C and N decreases intergranular corrosion resistance and workability, it is desirable that the upper limit value of C + N is 0.04% or less.
  • Al An element that has a deoxidizing effect and the like, is an element useful for scouring, has an effect of improving moldability, and can be contained as necessary.
  • it is necessary to ensure good brazing performance, and it is desirable to limit it to 0.5% or less.
  • it is desirable to satisfy 10 (Ti-3N) + Al ⁇ 0.5 in order to ensure good brazeability (however, The element symbol in the formula indicates the content (% by mass) of the element, and the numerical value before the element symbol is a constant.
  • P which is an inevitable impurity
  • S it is desirable to set it as 0.01% or less from a corrosion-resistant viewpoint.
  • the method for producing stainless steel of the present invention may be a general process for producing ferritic stainless steel. Generally, it is made into molten steel in a converter or electric furnace, refined in an AOD furnace or VOD furnace, and made into a steel piece by a continuous casting method or an ingot-making method, followed by hot rolling-annealing of hot-rolled sheet-pickling-cooling Manufactured through a process of hot rolling, finish annealing and pickling. If necessary, annealing of the hot-rolled sheet may be omitted, or cold rolling, finish annealing, and pickling may be repeated.
  • the brazing area after heating was measured. Regarding the brazing property, when the brazing area after heating was 2 times or more with respect to the brazing area before heating, it was judged good (good), and when it was less than 2 times, bad (bad).
  • the specific liquid amount was 3.6 ml ⁇ cm ⁇ 2 in accordance with the metal corrosion test in JIS K2234 “Antifreeze”, and a special grade reagent was used for urea used for preparing the urea aqueous solution. After completion of the corrosion test, the sample was weighed to obtain the corrosion rate, and solution analysis was performed by ICPS. Analytical elements were Fe, Cr, Ni, and Cu.
  • the wetting spreadability of the wax was evaluated in the same manner as the “wax wetting spreadability” described above. Thereafter, the cross-sectional microstructure of the test piece was observed. The number of crystal grains existing in the plate thickness direction is measured over a range of 20 mm in length parallel to the rolling direction, and one having two or more crystal grains in the plate thickness direction is good. Those that did not were considered bad.
  • the steels of Experimental Examples 1 to 11 had a maximum corrosion depth of less than 1 mm in the combined cycle test, and had good salt corrosion resistance. Further, the corrosion rate in the urea aqueous solution immersion test is less than 0.001 g ⁇ m ⁇ 2 ⁇ h ⁇ 1 , and the amounts of Fe, Cr, Cu and Ni in the solution after the test satisfy the provisions of JIS K2247-1. The internal corrosion resistance was also good. Among these, the value of C + N is 0.015 or more, and Experimental Examples 1, 3, 4, 6, 7, 8, 9, 10, 11 satisfying the formulas (IV) and (V) of the present invention.
  • both the Cr amount and the effective Cr amount are less than 10%, and the corrosion rate in the urea aqueous solution immersion test is as small as 0.005 g ⁇ m ⁇ 2 ⁇ h ⁇ 1 or less, but in the solution after the test.
  • the amount of Fe and Cr did not satisfy the requirements of JIS K2247-1.
  • the characteristics are good, the maximum erosion depth in the combined cycle test is 1 mm or more, and the salt corrosion resistance is poor.
  • Ferritic stainless steels of the present invention mainly by using urea water in an internal combustion engine consisting mainly of a diesel engine apparatus for reducing NO x in an exhaust gas, with particular reference to automotive urea SCR systems, stores urea water, produced Or it is a material suitable for the tank used when transporting.

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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Abstract

La présente invention concerne un acier inoxydable ferritique, destiné à être utilisé pour la production d'un réservoir d'eau-urée, qui a une teneur en C de : 0,05 % ou moins, en N de : 0,05 % ou moins, en Si de : 0,02 à 1,5 %, en Mn de : 0,02 à 2 % et en Cr de : 15 à 23 %, qui présente en outre une teneur en Nb et/ou en Ti en proportion de 8(C+N) à 1 %, le reste étant du fer et les inévitables impuretés, et qui a une teneur effective en Cr de 15 % ou plus, telle que définie par la formule (I), (II) ou (III). Quand l'acier ne contient que du Nb, la teneur effective en Cr = Cr + 4Si – 2Mn··· (I) ; quand l'acier ne contient que du Ti, la teneur effective en Cr = Cr + 4Si – 2Mn – 10Ti··· (II) ; et quand l'acier contient du Nb et du Ti, la teneur effective en Cr = Cr + 4Si – 2Mn – (10Ti – 3Nb)··· (III).
PCT/JP2009/063169 2008-07-23 2009-07-23 Acier inoxydable ferritique destiné à être utilisé pour la production d'un réservoir d'eau-urée WO2010010916A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20090800430 EP2316979A4 (fr) 2008-07-23 2009-07-23 Acier inoxydable ferritique destiné à être utilisé pour la production d'un réservoir d'eau-urée
JP2010521733A JP5588868B2 (ja) 2008-07-23 2009-07-23 尿素水タンク用フェライト系ステンレス鋼
US12/737,425 US20110110812A1 (en) 2008-07-23 2009-07-23 Ferrite stainless steel for use in producing urea water tank
CN200980128401.2A CN102099500B (zh) 2008-07-23 2009-07-23 尿素水箱用铁素体系不锈钢

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JP2008-190065 2008-07-23
JP2008190065 2008-07-23

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US (1) US20110110812A1 (fr)
EP (1) EP2316979A4 (fr)
JP (1) JP5588868B2 (fr)
KR (1) KR20110018455A (fr)
CN (1) CN102099500B (fr)
WO (1) WO2010010916A1 (fr)

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JP2010248625A (ja) * 2009-03-27 2010-11-04 Nippon Steel & Sumikin Stainless Steel Corp 耐局部腐食性に優れたフェライト系ステンレス鋼
JP2011184731A (ja) * 2010-03-08 2011-09-22 Nippon Steel & Sumikin Stainless Steel Corp 炭化水素燃焼排ガスから発生する凝縮水環境における耐食性に優れるフェライト系ステンレス鋼
JP2012112025A (ja) * 2010-11-26 2012-06-14 Nippon Steel & Sumikin Stainless Steel Corp 尿素ｓｃｒシステム部品用フェライト系ステンレス鋼板およびその製造方法
WO2023042470A1 (fr) * 2021-09-16 2023-03-23 日鉄ステンレス株式会社 Tôle d'acier inoxydable ferritique et procédé de production de tôle d'acier inoxydable ferritique

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EP2316979A1 (fr) 2011-05-04
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