WO2003044237A1 - Emploi d'acier inoxydable en presence d'acide organique et de solution saline - Google Patents

Emploi d'acier inoxydable en presence d'acide organique et de solution saline Download PDF

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Publication number
WO2003044237A1
WO2003044237A1 PCT/JP2002/004581 JP0204581W WO03044237A1 WO 2003044237 A1 WO2003044237 A1 WO 2003044237A1 JP 0204581 W JP0204581 W JP 0204581W WO 03044237 A1 WO03044237 A1 WO 03044237A1
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owt
stainless steel
content
corrosion
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PCT/JP2002/004581
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English (en)
Japanese (ja)
Inventor
Yutaka Kobayashi
Toshihiko Taniuchi
Yoshikuni Nakao
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Nippon Yakin Kogyo Co., Ltd.
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Priority claimed from JP2001357294A external-priority patent/JP4080729B2/ja
Priority claimed from JP2002020854A external-priority patent/JP4325141B2/ja
Application filed by Nippon Yakin Kogyo Co., Ltd. filed Critical Nippon Yakin Kogyo Co., Ltd.
Priority to US10/493,639 priority Critical patent/US20050016636A1/en
Publication of WO2003044237A1 publication Critical patent/WO2003044237A1/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
    • C22C38/02—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
    • C22C38/004—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
    • C22C38/04—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
    • 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

Definitions

  • the present invention provides a food production plant which is excellent in crevice corrosion resistance ⁇ ⁇ stress corrosion cracking resistance and in which organic acids such as amino acids and acetic acid and acetic acid are produced in the production process and in which the salt concentration is high.
  • the present invention relates to a stainless steel suitable for a soy sauce production plant.
  • stainless steel, inorganic or organic coated steel, or FRP, etc. is used for food production brands depending on the operating conditions such as the ingredients contained in the food being handled and the temperature, but in recent years maintenance has been easy.
  • the use of stainless steel is increasing from the viewpoint of reduction of pod maintenance cost and also of cleanability.
  • general-purpose stainless steels such as SUS304 and SUS316 are often used in food production plants such as soft drinks, beer, and milk, and serious problems such as leakage due to corrosion occur.
  • there is little concern about local corrosion such as pitting, crevice corrosion, or stress corrosion cracking when used at around room temperature, and the product can be used satisfactorily.
  • the present invention has been made in view of the above circumstances, and has as its object a food plant, particularly a soy sauce production plant or a shochu plant that contains organic acid during the fermentation process and contains high-concentration salt.
  • a food plant particularly a soy sauce production plant or a shochu plant that contains organic acid during the fermentation process and contains high-concentration salt.
  • the present inventors have conducted various studies on stainless steels suitable for food production plants, especially for food production plants including fermentation processes such as seasonings such as soy sauce containing a large amount of salt. It has been found that when organic acids such as amino acids, cunic acid, and lactic acid are formed, this accelerates the corrosion of stainless steel, particularly crevice corrosion and stress corrosion cracking.
  • the mechanism by which the corrosion of stainless steel is accelerated by organic acids is that the amino acid generated during the fermentation process acts as a reducing agent, deteriorating the surface passivation film that imparts corrosion resistance to stainless steel, while citrate , Lactic acid, etc. act on the stainless steel surface as a chelate, and promote the dissolution of water-soluble oxide-based inclusions such as water-soluble CaO and MgO that are not covered by a surface passivation film, resulting in crevice corrosion. And stress corrosion cracking as a starting point, deteriorating corrosion resistance. Therefore, in order to improve the corrosion resistance of the passive film on the stainless steel surface and its underlying metal in an environment containing high-concentration salt containing organic acids, it is necessary first to satisfy the following equation (1). found.
  • the gist of the first invention of the present invention is as follows: C: 0.05 wt% or less ,: S i ⁇ 1.00 wt%, Mn: 1.00 se% or less, P: 0.040% %, S: 0.03 wt% or less, Ni: 40.0 wt% or less, 16.0 wt% ⁇ Cr ⁇ 2 6.O wt%, 2.0 wt% ⁇ Mo ⁇ 8.0 wt% N 0.0 0 5 wt% ⁇ A l ⁇ 0.10 0 wt%, 0.1 0 wt% ⁇ N ⁇ 0.30 wt%, M g: 0.0 0 0 0 5 wt% or less, C a: 0.01010 wt% or less, with the balance being Fe and unavoidable impurities, and the following (1)
  • the gist of the second invention of the present invention is as follows: C: 0.05 wt% or less ,: S i ⁇ 1.00 wt%, Mn: 1.00 wt% or less, P: 0.040 wt% %, S: 0.03 wt% or less, 15.0 wt% ⁇ Ni ⁇ 40.0 wt%, 16.0 wt% ⁇ Cr ⁇ 26.0 wt%, 2. 0 wt ⁇ Mo ⁇ 8.0 wt% s 0.05 0 wt% ⁇ A l ⁇ 0.10 0 wt%, 0.10 wt% ⁇ N ⁇ 0.30 wt%, with the balance being Fe and unavoidable impurities, and the following formula (1)
  • the gist of the third invention of the present invention is the first invention or the second invention, characterized in that the organic acid contains one or more of amino acid, citric acid, acetic acid, and lactic acid.
  • the gist of the fourth invention of the present invention is as follows: C: 0.05 wt% or less ,: S i ⁇ 1.0 wt%, Mn: 1.0 wt% or less, P: 0.040 wt% % Or less, S: 0.03 wt% or less, Ni: 4 0..0 wt% Below, 16.0 wt% ⁇ Cr ⁇ 2 6.0 wt%, 2.0 wt% ⁇ Mo ⁇ 8.0 wt%, 0.05 wt ⁇ A l ⁇ 0.10 0 wt %, 0.10 wt% ⁇ N ⁇ 0.30 wt% s Mg: 0.0 0 5 wt% or less, Ca: 0.0 0 10 0 7% or less, the balance Fe and unavoidable (1)
  • Stainless steel for food plants characterized by the following: , C: 0.05 wt% or less,: S i ⁇ 1.00 wt%, Mn: 1.00 wt% or less, P: 0.040 wt% or less, S: 0.00 3 wt% or less, 15.0 wt% ⁇ N i ⁇ 40.0 wt%, 16.0 wt% ⁇ Cr ⁇ 26.0 wt%, 2.0 wt% ⁇ Mo ⁇ 8.0 wt% s 0.05 wt% ⁇ A l ⁇ 0.10 0 wt%, 0.10 wt% ⁇ N ⁇ 0.30 wt%, the balance being Fe and unavoidable impurities, And the following formula (1)
  • the gist of the sixth invention of the present invention is that the above stainless steel has the following formula (2)
  • Si, Al, Ca, and Mg indicate the content (wt%) of each component.
  • the weight ratio of CaO + MgO in the oxide-based inclusions in the steel is set to 20% or less, the austeny according to the first to fifth inventions described above.
  • the gist of the seventh invention of the present invention is the stainless steel according to the first to sixth inventions, wherein the stainless steel is used for a soy sauce production plant or a shochu production plant. Yes,
  • the gist of the eighth aspect of the present invention is that 0.0 1 w t% ⁇ C u ⁇ l.
  • the stainless steel according to any one of the first to seventh inventions further comprising one or more wt% of the wt% .
  • the gist of the ninth invention of the present invention is 0.
  • FIG. 1 is a graph showing the results of AES analysis of the surface of a test piece immersed in a test solution for one week.
  • FIG. 2 is a graph showing the change over time of the spontaneous immersion potential when a test piece is immersed in a test solution.
  • FIG. 3 is a graph showing the relational expression Cr + 3.3 Mo + 20N, the ratio of Ca0 + MgO in inclusions, and the presence or absence of corrosion in the corrosion test.
  • FIG. 4 is a graph showing the relationship between the relational expression S i + A l ⁇ 100 (C a + M g) and the ratio of C a O + M g O in inclusions.
  • the stainless steel of the present invention comprises (i) a predetermined chemical component and a proper content range thereof, (ii) a relationship between Cr, Mo, and N which particularly contributes to the improvement of corrosion resistance, and (iii) interposition in steel.
  • the composition of the product and the appropriate content ranges of A1, Si, Ca, and Mg constituting the composition are described below.
  • the present inventors first considered how the environment of a soy sauce production plant, which has a fermentation process and in which organic acids such as amino acids and lactic acid are generated in the process, is different from the case where such an organic acid does not exist. Was considered different.
  • test solutions Prepare the three types of test solutions, hold them at 35 ° C, immerse the SUS316L plate specimen wet-polished with emery paper No. 400 for 1 week, and immerse the surface.
  • Auger Electron Spectrometer (Hereinafter referred to as AES).
  • SEM scanning electron microscope
  • spontaneous immersion potential of each test piece during the one-week immersion period was measured using saturated calomel as a reference electrode. Before measuring the spontaneous immersion potential, air was blown into each test solution for 24 hours so that the dissolved oxygen became saturated.
  • Figure 1 shows the AES analysis results of the specimen surface after immersion in each solution for one week.
  • Fig. 1 analyzes the constituent elements of the surface passivation film in the depth direction with the Ar accelerating voltage set to 1 kV, and provides an index of the strength of the passive film [Cr] / [Cr] + [Fe] ] Shows the numbers arranged.
  • [Cr] and [Fe] represent the atomic% of each, and the higher this index is, the stronger the passive film is, that is, the better the corrosion resistance is.
  • there is no difference in the structure of the surface passivation film between 17% saline (2-1) or a solution of 17% saline with 1% lactic acid (2-3).
  • the solution (2-%) in which 1% glutamate was added to 17% saline, compared to 21 ⁇ 1 ⁇ 2—3,
  • Fig. 2 shows the measurement results of spontaneous immersion potential in each solution.
  • solution 2-1 ⁇ 2-— the change in spontaneous immersion potential from the start of the measurement was slight, but the solution contained glucamino acid.
  • solution 2-- ⁇ the spontaneous immersion potential rapidly decreased immediately after the start. From the above results, it was found that among the organic acids, glutamate, which is an amino acid, acts as a reducing agent, and as a result, makes the surface passivation film unstable.
  • lactic acid has a chelating structure, it preferentially reacts with Ca and Mg, which have a strong affinity for it, resulting in the selective dissolution of CaO and Mg0-based inclusions. It is considered to be a starting point for crevice corrosion and stress corrosion cracking. Therefore, for the above reasons, lactic acid and citric acid having a chelate structure among the organic acids increase the corrosiveness, and the presence of inclusions mainly composed of CaO and Mg0. It was found that the corrosion resistance deteriorated.
  • a stainless steel having the composition range of and having various weight ratios of CaO + MgO in the oxide-based inclusions in the steel was melted by an atmospheric melting furnace to obtain an ingot. This was subjected to heat treatment at 1250 ° C S for 8 hours, forging, cold rolling, and heat treatment at 1150 ° C for 30 minutes followed by water cooling, followed by cold rolling to a thickness of 2 mm. A plate was made.
  • test specimens were sampled from the 2 mm cold-rolled sheet in the same manner as in Experiment 1 described above, and specimens with a welding clearance were prepared by spot resistance welding.
  • soy sauce a fermented seasoning containing about 17% salt, was used as a test solution, and the test solution was kept at 35 ° C.
  • the test piece was crushed for 5 months. After immersion, center the weld nugget They were cut so that they could pass through, and their cross-sections were observed with an optical microscope to evaluate crevice corrosion or stress corrosion cracking. Regardless of which corrosion occurred, the evaluation was X, and the material that did not produce any corrosion was rated o.
  • Fig. 3 shows the corrosion test results for each of the materials in which the weight ratio of CaO + MgO in the oxide inclusions in steel is 20% or less and the materials in which the weight ratio is higher than 20%.
  • the horizontal axis in Fig. 3 shows Cr, Mo, and N, which have a large contribution to corrosion resistance, of the alloy components, and the total amount C is weighted so that the elements are almost equivalent from the degree of their contribution.
  • r + 3.3 MO + 20N (where Cr, Mo, and N indicate the content (wt%) of each component element). According to FIG. 3, when the weight ratio of CaO + MgO in the oxide-based inclusions is 20% or more, the value of Cr + 3.3 Mo + 20N exceeds 44.
  • Corrosion does not occur for the first time, but it is recognized that corrosion does not occur when the weight ratio of C a O + Mg 0 is 20% or less and the value of Cr + 3.3 Mo + 2 ON is 38 or more.
  • the higher the value of Cr + 3.3 Mo + 20N the better the corrosion resistance, but the more expensive elements must be added to the alloy, the higher the cost.
  • the lower limit of Cr + 3.3M0 + 20N required for corrosion resistance is reduced. It was determined that it could be lowered.
  • the index of Cr + 3.3 Mo + 20 N is at least 38 or more, the material is corroded in the soy sauce production plant containing high-concentration salt and organic acid. It has been shown that there is a possibility of occurrence.
  • the present inventors repeated studies for stably controlling the weight ratio of CaO + MgO in oxide-based inclusions in steel to be 20% or less, and as a result, the melting furnace It was found that the above ratio could be achieved if the contents of Si and Al, which are deoxidizing components, were within a certain range in consideration of Ca and Mg mixed from bricks and the like. That is, as shown in FIG.
  • C is an element that induces sensitization during welding and lowers the corrosion resistance, especially, so it is desirable that the content of C is small. However, excessive reduction of C causes a decrease in strength and an increase in manufacturing cost. Since the content of C is allowable up to 0.05 wt%, this value was set as the upper limit. S i: 1.00 wt% or less
  • Si is an element effective for deoxidation.In particular, it is necessary to reduce the ratio of CaO + MgO in oxide inclusions in steel to form the main components of oxide inclusions together with A1.
  • the preferred element is, however, an excessive addition saturates the effect, causes a decrease in ductility and an increase in strength, and further promotes precipitation of intermetallic compounds such as a phase and a phase; Must be 1.0% or less in order to degrade. Preferably, it is 0.70% or less, 0.50% or less, 0.25% or less, 0.20% or less, and more preferably 0.10% or less.
  • Mn 1.0 wt% or less
  • Mn is an element that must be reduced as much as possible in order to suppress the precipitation of intermetallic compounds such as phase and intermetallic phase and to suppress deterioration of corrosion resistance. There is a need. Desirably, the content should be less than 30 wt%, more preferably less than 0.2 wt%. P: 0.040 wt% or less
  • P is an element inevitably mixed as an impurity, and is likely to segregate at the crystal grain boundaries, and is desirably small from the viewpoint of corrosion resistance and hot workability.
  • extremely reducing the P content leads to an increase in manufacturing costs. Since the content of P is allowable up to 0.040 wt%, this value is set as the upper limit. However, it is desirable that the content is not more than 0.030% by weight.
  • S is an element unavoidably mixed as an impurity like P, and is likely to segregate at crystal grain boundaries, and is desirably small in terms of corrosion resistance and hot workability.
  • its content exceeds 0.003 wt%, its harmfulness will be remarkable, so the content was made 0.003 wt% or less.
  • Ni is an effective element for suppressing the precipitation of intermetallic compounds such as a phase and a phase, and is an essential element when the structure is made austenite. It is also an element that is effective in improving stress corrosion cracking resistance. However, if its content exceeds 40. 0 wt%, it causes deterioration of hot workability and increases hot deformation resistance. Therefore, the content of Ni was set to 40.0 wt% or less. The Ni content is preferably 18.0 to 30 wt%, more preferably 24.0 to 26 wt%.
  • C: ⁇ is an element effective for improving crevice corrosion resistance, and it is necessary to obtain the effect by using 16.
  • the content is set to 16.0 wt% to 26.01%.
  • the Cr content is preferably at least 20.0 wt%, more preferably at least 2.20 wt%.
  • Mo 2.0 wt% ⁇ Mo ⁇ 8.0 wt%
  • Mo is also an element effective in improving crevice corrosion resistance, and in order to obtain the effect, it is necessary to contain 2.0 wt% or more. However, when the content exceeds 8.0 wt%, the precipitation of intermetallic compounds is promoted and the corrosion resistance is deteriorated, so that the content was set to 2.0 wt% to 8.0 wt%.
  • the Mo content is preferably at least 3.0 wt%, more preferably at least 5.0 wt%.
  • a 1 0.05 wt% ⁇ A l ⁇ 0.10 wt%
  • a 1 is a strong deoxidizing agent, and as shown in Experiment 3, particularly C in oxide inclusions in steel
  • N is an effective element that improves crevice corrosion resistance as well as Cr and Mo and suppresses the precipitation of intermetallic compounds.To achieve this effect, 0.10 wt% or more is required. Must be included. However, if the content exceeds 0.30 wt%, the hot deformation resistance increases extremely and impairs hot workability, so the N content is 0.10 wt% to 0.307%. And The N content is 0.15 wt% or more. Is preferred.
  • Mg is usually inevitably contained in oxide inclusions in steel, but as is evident from the results of Experiment 3, it is necessary to make it 0.000 wt% or less from the viewpoint of corrosion resistance. is there. That is, if the content exceeds 0.005 wt%, inclusions soluble in the organic acid having a chelate structure are easily formed, and the corrosion resistance is deteriorated.
  • Mg is inevitably contained in oxide inclusions in steel, but as is clear from the results of Experiment 3, from the viewpoint of corrosion resistance, it is necessary to set it to 0.01 O wt% or less. There is. That is, if the content exceeds 0.001 Owt%, inclusions soluble in the organic acid having a chelate structure are easily formed, resulting in deterioration of corrosion resistance.
  • O wt% can be contained. These elements are effective for improving general corrosion resistance, but in order to obtain the effect, it is necessary to contain at least 0.01 wt%. On the other hand, if the content exceeds 1.0 wt%, the hot workability is impaired. Therefore, the content of each is set to 0.01 wt% to 1.07%.
  • B 0.0 0 1 ⁇ B ⁇ 0.0 10 wt%
  • 0.0 001 ⁇ B ⁇ 0.010 wt% can be contained.
  • B is extremely effective in improving hot workability. However, the effect is small when the content is less than 0.01 wt%, and conversely, when the content exceeds 0.010 wt%, the hot workability deteriorates. Therefore, the content of B is set to 0.001 wt% to 0.010 wt%.
  • the reason for the limitation is that, as is clear from the results of Experiment 3, when Cr + 3.3M0 + 2ON is less than 38, oxide-based inclusions in steel which are the main constituent elements of the present invention Even if the weight ratio of CaO + MgO in the medium is controlled by optimizing the contents of Si, Al, Ca, and Mg, sufficient corrosion resistance can be achieved with a soy sauce production plant containing high-concentration salt and organic acids This is because they do not have any.
  • the value of Cr + 3.3Mo + 2ON is preferably 40 or more, and more preferably 44 or more.
  • the weight ratio of Ca O + Mg O in oxide inclusions in steel is 20% or less S i + A l-100 (C a + Mg) ⁇ 0
  • the weight ratio of CaO + MgO in the oxide-based inclusions in steel is set to 20% or less, and S i, A 1s C a, and M g are represented by the following relational expression S i: + A l-1 0 0 (C a + M g) ⁇ 0
  • the present invention ⁇ H having the component compositions shown in Tables 2 and 3 and a comparative steel were melted in an air melting furnace to obtain ingots. 1 2 5
  • test specimens with weld clearance were prepared by spot resistance welding.
  • soy sauce a fermented seasoning containing about 17% sodium chloride, was used as a test solution, and the test solution was kept at 35 ° C and the test piece was immersed for 5 months.
  • the center of the formed nugget was cut off, and the cross section of the crevice was observed with an optical microscope to evaluate the occurrence of crevice corrosion or stress corrosion cracking. Table 3 shows the results.
  • Table 3 shows the indicators of Cr + 3.3 Mp + 2 ON and S i + A l-100 (C a + M g), and the average C a O + M in oxide inclusions in steel.
  • the g O weight ratio (%) is also shown, but when Cr + 3.3 Mo + 20 N ⁇ 38 and S i + A l-100 (C a + M g) ⁇ 0
  • the invention steel in which the weight ratio of CaO + MgO in the inclusions is not more than 20%, is not corrosive in soy sauce rining containing such low concentration sodium chloride and organic acid. It is clear that the material has no corrosion and has excellent corrosion resistance as compared with the comparative steel.
  • the present invention having the component compositions shown in Tables 4 and 5 with different Mn contents
  • a cold-rolled plate with a thickness of 2 mm was prepared from the light steel and the comparative example in the same manner as in Table 2, and two 80 x 25 x 2 mm and 60 x 20 x 2 mm plates were prepared.
  • the middle figure is w t%, the balance is iron. * Indicates that it is outside the scope of the present invention.
  • the total amount of Cr, Mo, and N is uniquely weighted to be equal to or more than a predetermined value, and S i, AlCa, and Mg are set within a predetermined range. Control the composition of oxide-based inclusions in steel to develop a stainless steel that has excellent corrosion resistance to food plants, especially soy sauce containing high-concentration salt and organic acids generated during the fermentation process I was able to.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
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  • Heat Treatment Of Steel (AREA)

Abstract

Acier inoxydable, caractérisé en ce que sa composition chimique, en pourcentage de poids, est la suivante :C : 0,05 % ou moins, 0,01 % ≤ Si ≤ 0,25 %, Mn : 0,40 % ou moins, P : 0,040 % ou moins, S : 0,003 % ou moins, Ni : 40,0 % ou moins, 16,0 % en poids ≤ Cr ≤ 26 % en poids, 2,0 % en poids ≤ Mo ≤ 8,0 % en poids, 0,005 % ≤ Al ≤ 0,100 %, 0,10 % ≤ N ≤ 0,30 %, Mg : 0,0005 % ou moins, Ca : 0,0010 % ou moins, et le reste : Fe et impuretés inévitables. Cet acier satisfait à la formule (1) Cr + 3,3 Mo + 20 N ≥ 38, dans laquelle Cr, Mo et N représentent les teneurs ( en pourcentage de poids) des constituants respectifs, et s'utilise dans les cas où un acide organique et un matériau salin sont présents. L'acier inoxydable selon l'invention peut s'utiliser dans les usine de fabrication de produits alimentaires, en particulier dans une usine de fabrication de sauce de soja faisant intervenir un processus de fermentation.
PCT/JP2002/004581 2001-11-22 2002-05-10 Emploi d'acier inoxydable en presence d'acide organique et de solution saline WO2003044237A1 (fr)

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US10/493,639 US20050016636A1 (en) 2001-11-22 2002-05-10 Stainless steel for use under circumstance where organic acid and saline are present

Applications Claiming Priority (4)

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JP2001357294A JP4080729B2 (ja) 2001-11-22 2001-11-22 食品プラント用ステンレス鋼
JP2001-357294 2001-11-22
JP2002-20854 2002-01-30
JP2002020854A JP4325141B2 (ja) 2002-01-30 2002-01-30 有機酸と塩分を含有する環境下で使用するステンレス鋼

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP1561834A1 (fr) * 2003-08-07 2005-08-10 Sumitomo Metal Industries, Ltd. Acier non oxydable duplex et procede de production correspondant
EP1712650A1 (fr) * 2003-12-26 2006-10-18 Matsushita Electric Industrial Co., Ltd. Materiau de boitier pour accumulateur
US7396421B2 (en) 2003-08-07 2008-07-08 Sumitomo Metal Industries, Ltd. Duplex stainless steel and manufacturing method thereof

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Publication number Priority date Publication date Assignee Title
DE102010049781A1 (de) * 2010-10-29 2012-05-03 Thyssenkrupp Vdm Gmbh Ni-Fe-Cr-Mo-Legierung
CN103748249B (zh) * 2011-08-22 2016-06-08 日本冶金工业株式会社 热加工性和表面性状优异的含硼不锈钢
JP5888737B2 (ja) * 2012-05-21 2016-03-22 日本冶金工業株式会社 オーステナイト系Ｆｅ−Ｎｉ−Ｃｒ合金
WO2015087529A1 (fr) 2013-12-12 2015-06-18 Ｊｆｅスチール株式会社 Matériau en acier présentant une excellente résistance à la corrosion par piqûre induite par l'alcool et une excellente résistance à la corrosion fissurante sous contrainte induite par l'alcool

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