WO2012172808A1 - Acier inoxydable ferritique - Google Patents

Acier inoxydable ferritique Download PDF

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Publication number
WO2012172808A1
WO2012172808A1 PCT/JP2012/003894 JP2012003894W WO2012172808A1 WO 2012172808 A1 WO2012172808 A1 WO 2012172808A1 JP 2012003894 W JP2012003894 W JP 2012003894W WO 2012172808 A1 WO2012172808 A1 WO 2012172808A1
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Prior art keywords
less
corrosion resistance
stainless steel
ferritic stainless
pickling
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Ceased
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PCT/JP2012/003894
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English (en)
Japanese (ja)
Inventor
和秀 石井
山内　克久
源一 石橋
秋信 神丸
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JFE Steel Corp
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JFE Steel Corp
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Priority to CN201280028884.0A priority Critical patent/CN103597109B/zh
Priority to KR1020147000241A priority patent/KR20140026602A/ko
Publication of WO2012172808A1 publication Critical patent/WO2012172808A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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

Definitions

  • the present invention relates to a ferritic stainless steel (ferritic stainless steel), excellent in surface properties (quality of surface), and excellent in corrosion resistance (corrosion resistance) and pickling (weld zone). It relates to ferritic stainless steel.
  • austenitic stainless steel SUS304 (18% Cr-8% Ni) (Japanese Industrial Standard, JIS G 4305) is widely used due to its excellent corrosion resistance.
  • JIS G 43005 Japanese Industrial Standard
  • this steel type is expensive because it contains a large amount of Ni.
  • Patent Document 1 as component composition, C: 0.03% or less, Si: 1.0% or less, Mn: 0.5% or less, P: 0.04% or less, S: 0 0.02% or less, Al: 0.1% or less, Cr: 20.5% or more, 22.5% or less, Cu: 0.3% or more, 0.8% or less, Ni: 1.0% or less, Ti : 4 ⁇ (C% + N%) or more, 0.35% or less, Nb: 0.01% or less, N: 0.03% or less, C + N: 0.05% or less, the balance being Fe and inevitable
  • a ferritic stainless steel sheet characterized by comprising impurities (inevitable impurities) is disclosed. This stainless steel plate is widely used for building members, industrial machines, and kitchens because of its excellent corrosion resistance and economy by not using Ni.
  • Corrosion resistance of the weld is determined by the thermal history during welding, where C and N in the steel combine with Cr and precipitate at the grain boundaries as chromium carbonitride (precipitates as Cr-carbides and Cr-nitrides at the grain boundaries during It is caused by the formation of chromium-depletion-layer-at-the-grain-boundaries- at the grain boundary by the cooling-state-of-welding. This phenomenon is called sensitization.
  • a method of reducing the amount of C and N in the steel and adding an appropriate amount of Ti to precipitate C and N as titanium carbonitride to prevent the formation of chromium carbonitride is taken. ing.
  • the TIG welded portion between the ferritic stainless steel plates disclosed in Patent Document 1 maintains good corrosion resistance.
  • SUS304 has a high C content of 0.04 to 0.05%, so that at the joint between the steel sheet and SUS304, In order to prevent sensitization, the amount of Ti added must be increased to about 0.4 to 1.0%.
  • the present invention is excellent in surface properties, and not only the same steel type but also different steel types, especially when used welded to SUS304, a ferrite system excellent in corrosion resistance and pickling properties of the welded portion. It aims to provide stainless steel.
  • the inventors add an appropriate amount of Si, the precipitation of titanium carbonitride is promoted in the initial stage of solidification, the size of the precipitate is reduced, and the problem of titanium stringers can be solved. It has been found that the formation of the film is suppressed and the oxide film is easily removed by pickling after welding. Furthermore, it has been found that sensitization can be prevented by precipitating a martensite phase in a TIG weld with SUS304 by optimizing the amount of Cr added.
  • the present invention has been made based on the above findings, and the gist thereof is as follows.
  • all component% is the mass% (mass%).
  • the composition further contains one or two selected from Ca: 0.0005 to 0.0020% and B: 0.0003 to 0.0020%.
  • ferritic stainless steel having good corrosion resistance of the welded portion can be obtained not only between the same steel types but also when used with different steel types, particularly SUS304.
  • the stainless steel plate of the present invention can prevent generation of titanium stringers by adding an appropriate amount of Si. Therefore, surface grinding with a hot-rolled sheet for preventing the generation of titanium stringers is not necessary, and the production can be performed at a low cost. Furthermore, a good appearance can be obtained by easily removing the oxide film formed on the welded portion by pickling.
  • C 0.010% or less, N: 0.015% or less, C + N: 0.02% or less C and N are desirable because they reduce the corrosion resistance of the welded portion.
  • Si 0.15-0.60%
  • Si is an element necessary for controlling the precipitation of titanium carbonitride and improving the surface properties.
  • the Si amount is in the range of 0.15 to 0.60%.
  • it is 0.20 to 0.50% of range. More preferably, it is in the range of 0.20 to 0.40%.
  • Mn 0.5% or less
  • the addition amount be low because it forms sulfides in the steel and significantly reduces the corrosion resistance. .5% or less.
  • the content is preferably in the range of 0.1 to 0.4%.
  • P 0.04% or less P is preferably smaller in terms of hot workability, and is 0.04% or less.
  • S 0.01% or less S is preferably smaller in terms of hot workability and corrosion resistance, and is 0.01% or less. Preferably, it is 0.006% or less.
  • Al 0.2% or less Al is an effective component for deoxidation, but excessive addition causes surface flaws due to an increase in Al-based non-metallic inclusions and lowers workability. % Or less. Al is preferably 0.06% or less because it lowers the welding efficiency.
  • Cr 17.0 to 19.0% Cr is effective in improving the corrosion resistance, and in order to obtain good corrosion resistance, addition of 17.0% or more is necessary, but addition exceeding 19.0% is martensite in the TIG welded portion with SUS304. As a result, no reduction of corrosion resistance can be prevented, so the Cr content is in the range of 17.0 to 19.0%. Preferably it is 17.5 to 18.5% of range. More preferably, it is in the range of 18.0 to 18.5%.
  • Cu 0.3 to 0.5%
  • Cu is an element necessary for ensuring corrosion resistance, and for that purpose, it is necessary to add at least 0.3% or more. However, when it exceeds 0.5%, hot workability deteriorates. Therefore, the Cu amount is set to a range of 0.3 to 0.5%.
  • Ni 0.6% or less Ni is effective in improving corrosion resistance, but is an expensive element and may cause stress corrosion cracking when added in excess of 0.6%. , 0.6% or less. Preferably it is 0.4% or less.
  • Ti 0.10 to 0.20%, Ti% / (C% + N%) ⁇ 8 Ti is an indispensable component for ensuring the corrosion resistance of the welded portion, and it is necessary to add Ti% / (C% + N%) ⁇ 8 at 0.10% or more. However, if it exceeds 0.20% and is added excessively, the surface properties of the hot-rolled sheet are deteriorated. Therefore, the Ti amount is in the range of 0.10 to 0.20%. In order to ensure the corrosion resistance of the welded portion, it is desirable that Ti% / (C% + N%) ⁇ 10.
  • Ca 0.0005 to 0.0020%
  • Ca is an effective component for preventing choking of CC nozzles due to precipitation of Ti-based inclusions that are likely to occur during continuous casting. If it is less than 0.0005%, the effect is not obtained, and if it exceeds 0.0020%, the corrosion resistance is lowered. Therefore, the Ca content is set in the range of 0.0005 to 0.0020%.
  • B 0.0003 to 0.0020% B is effective in preventing low temperature secondary working embrittlement. If the content is less than 0.0003%, the effect is not obtained. If the content exceeds 0.0020%, the hot workability deteriorates, so the B content is in the range of 0.0003 to 0.0020%. Preferably it is 0.0003 to 0.0010% of range.
  • V and Co may be mixed from Cr ore (ore), but if mixed, the steel becomes hard and the workability deteriorates.
  • Si% / Ti% ⁇ 1.3 When the amount of Ti added is large, large titanium carbonitride precipitates and the surface properties tend to deteriorate. Therefore, when the amount of Ti added is large, it is necessary to increase the amount of Si added to further promote the precipitation of titanium carbonitride at the initial stage of solidification and prevent the precipitation of large titanium carbonitride. For this reason, Si addition of Si% / Ti% ⁇ 1.3 is desirable.
  • Si% / Cr% ⁇ 0.013 When stainless steel is welded, an oxide film is formed on the surface and the aesthetic appearance is impaired. In many applications, this oxide film must be removed by pickling. However, ferritic stainless steel having a high Cr content produces an oxide film containing a large amount of Cr oxide, which is difficult to remove by pickling. Therefore, since Si is more easily oxidized than Cr, increasing the ratio of Si content to Cr content, increasing the amount of Si oxide generated, and suppressing the formation of Cr oxide will remove the oxide film by pickling. I found it easier to do. In order to obtain this effect, Si% / Cr% ⁇ 0.013 is desirable.
  • continuous casting is performed on a slab, and the steel is heated to 1100 to 1250 ° C. and hot-rolled to obtain a hot-rolled coil. This is annealed at a temperature of 800 to 1000 ° C. in a continuous annealing / pickling line for hot rolling and pickling.
  • a method of performing cold rolling and finish annealing and pickling as a cold-rolled sheet is recommended. Details are as follows.
  • the above chemical range is achieved by secondary refining by converter, electric furnace, etc. and strong stirring / vacuum oxygen decarburization (Vacuum Oxygen Decarburization) or argon / oxygen decarburization (Argon-Oxygen Decarburization).
  • the adjusted molten steel is melted.
  • the slab is melted from the molten steel by continuous casting or ingot casting.
  • the casting method is preferably continuous casting in terms of productivity and quality.
  • the slab obtained by casting is heated to 1100 to 1250 ° C, hot-rolled, annealed at a temperature of 800 to 1000 ° C, and then pickled.
  • the hot-rolled sheet annealing temperature is preferably 850 to 950 ° C.
  • the pickled hot-rolled sheet becomes a cold-rolled annealed sheet through the steps of cold rolling, finish annealing, cooling, and pickling.
  • the rolling reduction during cold rolling is preferably 50% or more in order to ensure mechanical properties such as extensibility, bendability and press formability.
  • the cold rolling may be performed once or twice or more cold rolling including intermediate annealing. The steps of cold rolling, finish annealing, and pickling may be repeated.
  • cold rolled sheet annealing and pickling are performed in a cold rolled sheet continuous annealing line. Further, if necessary, annealing may be performed with a bright annealing line.
  • a ferritic stainless steel having the composition of Invention Examples A1 to A5 and Comparative Examples C1 to C5 shown in Table 1 was melted in a 30 kg steel ingot, heated to a temperature of 1150 ° C. and hot-rolled to obtain a plate thickness A 4.0 mm hot-rolled sheet was used.
  • cold rolling was performed to produce a cold-rolled sheet having a thickness of 0.8 mm.
  • annealing was performed at 930 ° C. in an argon gas atmosphere, and pickling was performed using a mixed acid of hydrofluoric acid and nitric acid.
  • a salt spray cycle test (salt spray cyclic corrosion test) was performed on the test material in accordance with JIS H8502.
  • Salt spray cycle test 5% NaCl spray (35 ° C, 2 hr) (spraying 5% NaCl aqueous solution at 35 ° C, 2hr) ⁇ drying (60 ° C, 4hr, relative humidity 20-30%) (drying at 60 ° C, 4hr, ⁇ ⁇ ⁇ relative humidity 20 to 30%) ⁇ wet (40 °C, 2hr, relative humidity of 95% or more) (wetting at 40 °C, 2hr, relative humidity 95% or more) was performed for 15 cycles.
  • Salt spray cycle test result The rusting area after the 15-cycle test was determined to be less than 20% as ⁇ (pass) and 20% or more as x (fail).
  • Corrosion resistance test result of the same material (same steel type) TIG welded part After performing TIG butt welding with the same steel type and polishing the surface with No. 600 abrasive paper, after 15 cycles of salt spray cycle test As for the rusting rate of a welded part (weld metal and heat affected zone (Heat Affected Zone)), less than 20% was judged as ⁇ (passed), and 20% or more was judged as x (failed).
  • Comparative Example C1 having a low Cr content of 16.5% had a large rusting area and poor corrosion resistance.
  • C2 with a low Ti content of 0.07% and C3 with a low Ti% / (C% + N%) of 6.2 had a large rusting area and poor corrosion resistance.
  • Comparative Example C4 with a high Cr addition amount of 19.4% and Comparative Example C5 of the ferritic stainless steel sheet disclosed in Patent Document 1 have a large rusting area. Corrosion resistance was poor.
  • Ferritic stainless steel having the composition of Invention Examples B1 to B6 and Comparative Examples D1 to D4 (D4 is a ferritic stainless steel disclosed in Patent Document 1) shown in Table 2 is melted at 150 ton VOD, and then continuously cast. Cast into a slab. This was heated to a temperature of 1150 ° C. and hot-rolled to obtain a hot-rolled coil having a plate thickness of 4.0 mm.
  • pickling is performed using sulfuric acid, followed by pickling using a mixed acid of hydrofluoric acid and nitric acid to perform hot rolling annealing pickling.
  • a coil was used.
  • neutral salt electrolysis is performed, followed by mixed acid of hydrofluoric acid and nitric acid.
  • the pickling used was made into a cold-rolled annealed pickling coil. The surface properties of the obtained cold-rolled annealed pickling plate were visually determined.
  • Example 2 Furthermore, the surface of the obtained cold-rolled annealed pickling plate was polished with No. 600 polishing paper to obtain a test material.
  • a salt spray cycle test according to JIS H 8502 the same steel type TIG welded part corrosion resistance test, and the different steel type TIG welded part corrosion resistance test with SUS304 were conducted.
  • Table 2 shows the results obtained as described above.
  • Salt spray cycle test result The rusting area after the 15-cycle test was determined to be less than 20% as ⁇ (pass) and 20% or more as x (fail).
  • Corrosion resistance test result of the same steel type TIG welded part After performing TIG butt welding with the same steel type and polishing the surface with No. 600 abrasive paper, the rusting rate of the welded part after 15 cycles of the salt spray cycle test, Less than 20% was judged as ⁇ (pass), and 20% or more was judged as ⁇ (fail).
  • Corrosion resistance test result of different steel type TIG welded part with SUS304 SUS304 and TIG butt welded, the surface was polished with No.
  • the TIG welding of (2) and (3) was performed such that Ar gas was flowed as a shielding gas on the front and back surfaces, no filler material was used, and the width of the back bead was about the plate thickness.
  • the welding conditions are: welding speed: 600 mm / min, welding voltage: 10 to 12 V, welding current: 70 to 110 A, shielding gas amount: table 10 liter / min, back 5 liter / min.
  • Comparative Example D1 with a low Si addition amount of 0.07%
  • Comparative Example D2 with a high Ti addition amount of 0.28%
  • Comparative Example D4 with a high amount of 0.29%
  • Comparative Example D3 which was as high as 0.55%
  • the surface properties of the cold-rolled annealed pickled plates were all inferior.
  • the inventive examples B1 to B6 all had excellent surface properties.
  • the salt spray cycle test the same steel type TIG welded portion corrosion resistance test, and the different steel type TIG welded portion corrosion resistance test with SUS304, the inventive examples B1 to B6 showed good corrosion resistance in any of the tests.
  • Ferritic stainless steels having compositions of Invention Examples E1 to E10 and G1 to G6 shown in Table 3 were melted at 150 ton VOD, and then cast into a slab by continuous casting. Note that the B amount of E3 and E6, the Ca amount, the B amount of E9 and G4, and the Ca amount of G6 are all inevitable impurity level contents. Each slab was heated to a temperature of 1150 ° C. and hot-rolled to form a hot-rolled coil having a plate thickness of 4.0 mm.
  • pickling was performed using sulfuric acid, followed by pickling using a mixed acid of hydrofluoric acid and nitric acid to obtain a hot rolled annealing pickled coil.
  • pickling was performed using sulfuric acid, followed by pickling using a mixed acid of hydrofluoric acid and nitric acid to obtain a hot rolled annealing pickled coil.
  • neutral salt electrolysis is performed, followed by pickling using a mixed acid of hydrofluoric acid and nitric acid, A cold-rolled annealed pickled coil was obtained.
  • the surface properties of the obtained cold-rolled annealed pickling plate were visually determined.
  • the plate thickness was set to 0.8 mm by cold rolling, but in Example 3, the thickness was set to 1.2 mm, which is a condition for easily detecting the presence of titanium stringers.
  • the surface of the obtained cold-rolled annealed pickling plate was polished with No. 600 polishing paper to obtain a test material.
  • Salt spray cycle test result The rusting area after the 15-cycle test was determined to be less than 20% as ⁇ (pass) and 20% or more as x (fail).
  • Corrosion resistance test result of the same steel type TIG welded part After performing TIG butt welding with the same steel type and polishing the surface with No. 600 abrasive paper, the rusting rate of the welded part after 15 cycles of the salt spray cycle test, Less than 20% was judged as ⁇ (pass), and 20% or more was judged as ⁇ (fail).
  • the removal of the oxide film was observed every 10 minutes by pulling it up from the acid solution and rubbing the oxide film on the welding front side (the surface directly exposed to the welding arc) with a nylon brush. ⁇ (particularly excellent) that the oxide film was able to be removed in the total immersion time of 30 minutes or less, ⁇ (passed) that was able to be removed in excess of 30 minutes to 120 minutes or less, even if the immersion was over 120 minutes What remained was judged as x (failed).
  • the determination result of the surface property is Si% / Ti% ⁇ 1.3.
  • E1 to E10 were particularly excellent with a surface defect rate of less than 3%.
  • G1 to G6 with Si% / Ti% ⁇ 1.3 passed the surface defect rate of 3% or more and less than 10%.
  • Si% / Ti% ⁇ 1.3 is effective for improving the surface properties.
  • E1 to E10 and G1 to G6 showed good corrosion resistance in the salt spray test, the same steel type TIG welded portion corrosion resistance test, and the different steel type TIG welded portion corrosion resistance test with SUS304.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention se rapporte à un acier inoxydable ferritique qui présente une excellente qualité de surface tout en montrant une excellente résistance à la corrosion et une excellente performance de décapage à l'acide dans une partie soudée. L'acier inoxydable ferritique est caractérisé par le fait qu'il contient, en % en masse, une quantité de carbone (C) égale ou inférieure à 0,010 %, une quantité de silicium (Si) comprise entre 0,15 et 0,60 %, une quantité de manganèse (Mn) égale ou inférieure à 0,5 %, une quantité de phosphore (P) égale ou inférieure à 0,04 %, une quantité de soufre (S) égale ou inférieure à 0,01 %, une quantité d'aluminium (Al) égale ou inférieure à 0,2 %, une quantité de chrome (Cr) comprise entre 17,0 et 19,0 %, une quantité de cuivre (Cu) comprise entre 0,3 et 0,5 %, une quantité de nickel (Ni) égale ou inférieure à 0,6 %, une quantité de titane (Ti) comprise entre 0,10 et 0,20 %, et une quantité d'azote (N) égale ou inférieure à 0,015 %, le carbone (C) plus l'azote (N) étant égal ou inférieure à 0,02 % et le reste étant du fer (Fe) et des impuretés inévitables. L'acier inoxydable ferritique est également caractérisé par le fait qu'il satisfait la formule (1). % de Ti/(% de C + % de N) ≥ 8 (1) Dans cette relation, le % de carbone (C), le % d'azote (N) et le % de titane (Ti) représentent respectivement les teneurs (en % en masse) en carbone (C), en azote (N) et en titane (Ti).
PCT/JP2012/003894 2011-06-15 2012-06-14 Acier inoxydable ferritique Ceased WO2012172808A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201280028884.0A CN103597109B (zh) 2011-06-15 2012-06-14 铁素体系不锈钢
KR1020147000241A KR20140026602A (ko) 2011-06-15 2012-06-14 페라이트계 스테인리스강

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JP2011132775 2011-06-15
JP2011-132775 2011-06-15
JP2012-025974 2012-02-09
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JP2019081916A (ja) * 2017-10-27 2019-05-30 Ｊｆｅスチール株式会社 フェライト系ステンレス鋼板およびその製造方法
KR102120695B1 (ko) * 2018-08-28 2020-06-09 주식회사 포스코 산세성이 우수한 페라이트계 스테인리스강

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