EP2554701B1 - Ferritic stainless steel sheet superior in surface glossiness and corrosion resistance and method for producing same - Google Patents
Ferritic stainless steel sheet superior in surface glossiness and corrosion resistance and method for producing same Download PDFInfo
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- EP2554701B1 EP2554701B1 EP11762738.0A EP11762738A EP2554701B1 EP 2554701 B1 EP2554701 B1 EP 2554701B1 EP 11762738 A EP11762738 A EP 11762738A EP 2554701 B1 EP2554701 B1 EP 2554701B1
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- 238000005260 corrosion Methods 0.000 title claims description 71
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 62
- 239000010959 steel Substances 0.000 claims description 62
- 238000000137 annealing Methods 0.000 claims description 26
- 238000005098 hot rolling Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- 238000005097 cold rolling Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000004615 ingredient Substances 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 9
- 238000001953 recrystallisation Methods 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 description 19
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- 238000007254 oxidation reaction Methods 0.000 description 9
- 238000007670 refining Methods 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 229910052758 niobium Inorganic materials 0.000 description 7
- 230000000087 stabilizing effect Effects 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 238000005554 pickling Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000010960 cold rolled steel Substances 0.000 description 5
- 206010039509 Scab Diseases 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 150000001447 alkali salts Chemical class 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- DXHPZXWIPWDXHJ-UHFFFAOYSA-N carbon monosulfide Chemical class [S+]#[C-] DXHPZXWIPWDXHJ-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous 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
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the present invention relates to an alloy-saving type ferritic stainless steel sheet which is excellent in surface glossiness and corrosion resistance and a method for producing the same.
- a ferritic stainless steel sheet is extensively used in household electrical appliances, kitchen equipments, and other fields in which corrosion resistance and surface quality in an indoor environment are demanded.
- SUS430LX and SUS430J1L in the JIS standard may be mentioned.
- NPLT 1 describes representative examples SUS430LX and SUS430J1L which are excellent in corrosion resistance.
- Such a ferritic stainless steel reduces the C and N, contains Cr: 16 to 20%, Nb: 0.3 to 0.6%, and Ti and trace amounts of Cu and Mo added compositely to prevent deterioration of the surface properties due to pitting or rusting.
- ferritic stainless steel sheet to which Nb, Ti, etc. have been added has had the defect of being inferior in surface glossiness compared with other ferritic stainless steel sheet (SUS430) in the No. 3D finished or No. 2B finished products prescribed in JIS G 4305 and G 4307.
- PLT 1 discloses the method of production of cold rolled steel strip which is excellent in surface glossiness by the control of the amount of oxide scale formation in annealing a ferritic stainless steel to which Ti, Nb, etc. are added.
- PLT 2 discloses the method of descaling cold rolled steel strip and the method of production of stainless cold rolled steel strip which is excellent in glossiness and corrosion resistance which prescribes the step of neutral salt electrolysis-nitrate electrolysis.
- PLT 3 discloses the method of production of high glossiness stainless steel strip which controls the roughness of the work roll and lubrication conditions in cold rolling.
- the above-mentioned ferritic stainless steel sheet is excellent economically to an austenitic stainless steel sheet which contains a large amount of Ni - which has remarkably risen in price in recent years.
- Ni - which has remarkably risen in price in recent years.
- SUS430LX and SUS430J1L will also have economically sufficient in the future.
- PLT 4 and PLT 5 disclose a ferritic stainless steel which proactively adds P so as to improve the weather resistance, corrosion resistance, and crevice corrosion resistance.
- PLT 4 is a high Cr and P ferritic stainless steel which contains Cr: over 20% to 40% and P: over 0.06% to 0.2%.
- PLT 5 is a P ferritic stainless steel which contains Cr: 11% to less than 20% and P: over 0.04% to 0.2%.
- P becomes a factor inhibiting manufacturability, workability, and weldability.
- the inventors have disclosed a ferritic stainless steel which is improved in corrosion resistance by utilizing trace elements - without relying on alloying of Cr or Mo from the viewpoint of economy.
- PLT 6 is a ferritic stainless steel which contains Cr: 13 to 22% and Sn: 0.001 to 1%, reduces the C, N, Si, Mn, and P, and adds Ti: 0.08 to 0.35% as a stabilizing element.
- these literatures do not study the effects on the surface glossiness at all, as explained above.
- NPLT 1 Stainless Steel Handbook, 3rd Edition, P532
- the present invention has as its theme to obtain a corrosion resistance which is not different from SUS430LX or SUS430J1L by an amount of Cr of less than 16% and strikingly improve the surface glossiness in alloy-saving type ferritic stainless steel sheet and has as its object the provision of alloy-saving type ferritic stainless steel sheet and a method for producing the same which realize this.
- the inventors engaged in in-depth studies to solve the above problem. As a result, the inventors obtained the following new findings which are the effect of improvement of corrosion resistance due to the addition of Sn and, in addition, and the relationship between the addition of the stabilizing elements Nb and Ti and the surface glossiness in ferritic stainless steel with an amount of Cr of less than 16%, and thereby completed the present invention.
- the gist of the present invention obtained based on the above findings (a) to (g), is as follows:
- the remarkable effect is exhibited of obtaining an alloy saving type ferritic stainless steel sheet which is excellent in surface glossiness and corrosion resistance which does not rise in alloy cost or manufacturing cost and therefore is excellent in economy.
- the steel sheet has a corrosion resistance no different from SUS430LX and SUS430J1L, and remarkably improves the surface glossiness.
- Si is sometimes added as a deoxidizing element.
- Si is a solution strengthening element.
- the upper limit is 1.0%.
- the lower limit of the Si content is 0.01%. If considering the workability and manufacturing cost, the lower limit is preferably 0.05%.
- the upper limit of the content is 1.5%. From the viewpoint of the corrosion resistance, the less the content of Mn is, the better characteristics are presented.
- the upper limit is preferably 1.0%, more preferably 0.3%, still more preferably 0.2%. Further, excessive reduction leads to an increase in the refining cost, so the lower limit of the content of Mn is 0.01%. Preferably, considering the corrosion resistance and the manufacturing cost, the lower limit should be 0.05%.
- the upper limit of the content is 0.05%. From the viewpoint of the manufacturability and weldability, the less the content of P is, the better characteristics are presented.
- the upper limit is preferably 0.04%, more preferably 0.03%. Further, an excessive reduction leads to an increase in the refining costs, so the lower limit of the content of P is 0.005%. More preferably, considering the manufacturing cost, it should be 0.01%.
- S is an impurity element. It inhibits corrosion resistance and hot workability. The less the content of S is, the better characteristics are presented.
- the upper limit of the content of S is 0.01%. From the viewpoint of the corrosion resistance or hot workability, the less the content of S is, the better characteristics are presented.
- the upper limit is preferably 0.005%, more preferably 0.003%, still more preferably 0.002%.
- the lower limit of the content is 0.0001%. More preferably, considering the corrosion resistance and manufacturing cost, the lower limit should be 0.0002%.
- Cr is an element of ferritic stainless steel. It is also an essential element for securing the corrosion resistance. To secure the corrosion resistance of the present invention, the lower limit is 12%. The upper limit is 16% from the viewpoint of economy compared with SUS430LX. Considering the corrosion resistance and the amount of addition of Sn, it is preferably 13 to 15%.
- the upper limit is preferably 0.02%, more preferably 0.012%. Further, excessive reduction leads to an increase in the refining cost, so preferably the lower limit is 0.001%. More preferably, considering the corrosion resistance and manufacturing cost, the content should be 0.005%.
- Nb is an essential element for improving the corrosion resistance and, in addition, improving the surface gloss in the trace Sn steel of the present invention.
- the above effect is expressed from 0.05% or more.
- the upper limit is 0.3%.
- Lhe content is 0.1 to 0.2%.
- Ti functions as a stabilizing element which immobilizes the C and N and also is an essential element for improvement of the corrosion resistance.
- the above effect is expressed from 0.03%.
- the upper limit is 0.15%.
- the content is 0.05 to 0.1%.
- the lower limit of the content is 0.005%.
- the upper limit of the content of Al is 0.5%. From the viewpoint of the workability, toughness, and weldability, the less the content of Al is, the better characteristics are presented.
- the upper limit is preferably 0.1%, more preferably 0.05%, still more preferably 0.03%. Further, considering the refining cost, the lower limit of the content is more preferably 0.01%.
- Sn is an essential element for securing the corrosion resistance which is targeted by the present invention without relying on alloying of Cr and Mo and addition of the rare elements Ni, Co, etc.
- the lower limit of the content of Sn is 0.01%.
- the content is preferably 0.05% or more, more preferably 0.1% or more.
- the upper limit is 1.0%.
- the upper limit of the content is 0.5% or less, more preferably 0.3%, still more preferably 0.2%.
- Nb and Ti are added in the above ranges.
- the amounts of addition should satisfy 1 ⁇ Nb/Ti ⁇ 3.5 to obtain the corrosion resistance and the surface glossiness which are targeted by the present invention.
- Nb/Ti ⁇ 1 surface gloss due to the Ti-based inclusions or Ti-based oxides decreases.
- 3.5 ⁇ Nb/Ti surface gloss due to the internal oxidation or grain boundary oxidation caused by the rise of the hot rolling heating temperature and annealing temperature decreases.
- the more preferable range is 1.5 ⁇ Nb/Ti ⁇ 3 considering the corrosion resistance and surface glossiness which are targeted by the present invention.
- Ni, Cu, Mo, V, Zr, and Co are elements which improve the corrosion resistance due to a synergistic effect with Sn and may be added in accordance with need.
- the contents When added, the contents are the 0.01% or more where this effect is exhibited, preferably 0.02% or more. More preferably, the contents are 0.05% where the effect is more remarkable. However, if over 0.5%, a rise in the material cost or a decrease in the surface glossiness occurs, so the upper limits of the contents are 0.5%. Since these elements are rare, in case of adding these elements, the preferable ranges of Ni and Cu are 0.1 to 0.4%, while the preferable range of Mo is 0.1 to 0.3%. The preferable ranges of V, Zr, and Co are 0.02 to 0.3%.
- Mg forms Mg oxides in the molten steel together with Al and acts as a deoxidant and also acts as nuclei for precipitation of TiN.
- TiN forms the nuclei for solidification of the ferrite phase in the solidification process.
- By promoting the crystallization of TiN it is possible to cause the fine formation of the ferrite phase at the time of solidification.
- By refining the solidified structure it is possible to prevent surface defects due to ridging or roping or other coarse solidified structures of the product.
- it causes improvement of the workability. Therefore, it may be added as needed.
- the content is 0.0001% or more for realizing these effects. However, if over 0.005%, the manufacturability deteriorates, so the upper limit is 0.005%.
- the content is 0.0003 to 0.002%.
- B is an element which improves the hot workability and the secondary workability. Addition to ferritic stainless steel is effective, so it may be added as needed. When added, the content is 0.0003% or more for realizing these effects. However, excessive addition leads to a decrease in the elongation, so the upper limit is 0.005%. Preferably, considering the material cost and workability, the content is 0.0005 to 0.002%.
- Ca is an element which improves the hot workability and the cleanliness of the steel and may be added as needed.
- the content is 0.0003% or more for realizing these effects.
- the upper limit is 0.005%.
- the content is 0.0003 to 0.0015%.
- a slab of steel which has the ingredients which are shown in the above section [I] was inserted in a hot rolling heating furnace and heated.
- the extraction temperature of the slab from the hot rolling heating furnace was 1080°C or more so as to secure an amount of scale formation for removing inclusions at the surface layer of the cast slab which would lead to scabs.
- the amount of scale formation should be, converted to scale thickness, 0.2 mm or more.
- the upper limit of the extraction temperature was 1190°C to suppress the formation of MnS or CaS which form starting points of rust and stabilize Ti-based carbon sulfides (for example Ti 4 C 2 S 2 ). If considering securing the corrosion resistance and the surface gloss which are targeted by the present invention, the extraction temperature is preferably 1140 to 1180°C.
- the coiling temperature after hot rolling is 500°C or more so as to suppress surface defects during coiling. If the coiling temperature is less than 500°C, the spraying of water after hot rolling causes shape defects in the hot rolled steel strip and induces surface defects at the time of uncoiling or running operations.
- the coiling temperature is 700°C or less so as to suppress the growth of internal oxides or grain boundary oxidation which leads to a decrease in gloss. Over 700°C, precipitates which contain Ti or P easily form and are liable to lead to a decrease in corrosion resistance. If considering securing the surface gloss and corrosion resistance which are targeted by the present invention, the coiling temperature is preferably 550 to 650°C.
- the sheet After coiling in hot rolling, the sheet is cold rolled. At this time, before the cold rolling, the hot rolled sheet may also be annealed. Further, the cold rolling may be performed once, or twice or more. However, when cold rolling twice or more, process annealing is performed between the cold rolling operations.
- the annealing temperature is preferably 1050°C or less. Further, the lower limit of the annealing temperature is preferably the recrystallization temperature of the steel (850°C or so).
- the "recrystallization temperature” means the temperature where new strain-free crystal grains are formed from the rolled worked structure. In the case of performing process annealing between the cold rolling operations, it is preferable to use a similar temperature range.
- the conditions of the cold rolling are not particularly limited.
- the finish annealing after the cold rolling is preferably performed at 980°C or less by considering the surface gloss. As explained above, the lower the annealing temperature, the more the internal oxidation and grain boundary oxidation are suppressed. It is advantageous for improvement of the surface gloss. Therefore, the lower limit is preferably the recrystallization temperature of 850°C.
- the pickling method is not particularly limited. There is no problem even if performed by a method which is commonly used industrially. For example, there are dipping in an alkali salt bath + electrolytic pickling + dipping in nitrofluoric acid and dipping in an alkali salt bath + electrolytic pickling. The electrolytic pickling may be performed by neutral salt electrolysis, nitric acid electrolysis, etc.
- a ferritic stainless steel which has the ingredients of Table 1 was smelted, hot rolled by an extraction temperature of 1150 to 1220°C, and coiled by a coiling temperature of 480 to 750°C to obtain hot rolled steel sheet of a thickness of 4.0 to 6.0 mm.
- the hot rolled steel sheet was annealed, or not, and was cold rolled once or twice interspaced by process annealing to produce 0.4 to 1.0 mm thick cold rolled steel sheet.
- the obtained cold rolled steel sheet was treated by finish annealing at a temperature of completion of recrystallization of 870 to 1020°C and was treated by ordinary pickling to obtain the No. 2B product in surface specifications prescribed in JIS G 4307.
- the surface gloss was evaluated by measuring the gloss 45° Gloss value (Gs45°) in the rolling direction of the steel sheet (0°) and in the direction perpendicular to the rolling (90°) prescribed in JIS Z 8741.
- the corrosion resistance was evaluated by preparing samples of steel sheets (thickness x 100 mm square) of No. 2B surfaces and #600 polished surfaces and running tests dipping them in a 80°C, 0.5% NaCl aqueous solution for 168 hr and salt spray tests based on JIS Z 2371 (168 hr continuous spray test).
- Test No. 8, 9, 15, and 16 have the ingredients which are prescribed in the present invention, but deviate from the method of production according to the present invention (extraction temperature and coiling temperature). These steel sheets satisfy the corrosion resistance or gloss which is targeted by the present invention, but the gloss is inferior to other examples of the present invention.
- Test No. 22 to 29 are the production method which is prescribed in the present invention, but using ingredients are deviated from that of the present invention. These steel sheets cannot give both the surface gloss and corrosion resistance which are targeted in the present invention.
- FIG. 1 and FIG. 2 show the relationship between the amounts of Nb/Ti and the surface gloss in the examples.
- the surface gloss which is targeted by the present invention that is, Gs45°(0°) of 610 or more and Gs45°(90°) of 520 or more corresponding to SUS430LX, it is important to obtain the ranges of ingredients according to the present invention being 1 ⁇ Nb/Ti ⁇ 3.5.
- an alloy-saving type ferritic stainless steel excellent in surface gloss and corrosion resistance which is economically excellent without rising in alloy cost or manufacturing cost, has a corrosion resistance of SUS430LX or SUS430J1L, and is strikingly improved in surface gloss.
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010076099 | 2010-03-29 | ||
JP2010239851 | 2010-10-26 | ||
PCT/JP2011/057512 WO2011122513A1 (ja) | 2010-03-29 | 2011-03-22 | 表面光沢と耐銹性に優れたフェライト系ステンレス鋼板およびその製造方法 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2554701A1 EP2554701A1 (en) | 2013-02-06 |
EP2554701A4 EP2554701A4 (en) | 2015-04-29 |
EP2554701B1 true EP2554701B1 (en) | 2016-06-29 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11762738.0A Active EP2554701B1 (en) | 2010-03-29 | 2011-03-22 | Ferritic stainless steel sheet superior in surface glossiness and corrosion resistance and method for producing same |
Country Status (9)
Country | Link |
---|---|
US (1) | US20130017116A1 (pt) |
EP (1) | EP2554701B1 (pt) |
JP (1) | JP5709845B2 (pt) |
KR (1) | KR101536291B1 (pt) |
CN (1) | CN102822373B (pt) |
BR (1) | BR112012024625B1 (pt) |
ES (1) | ES2581315T3 (pt) |
TW (1) | TWI461547B (pt) |
WO (1) | WO2011122513A1 (pt) |
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JP5274074B2 (ja) * | 2008-03-28 | 2013-08-28 | 新日鐵住金ステンレス株式会社 | 耐酸化性に優れた耐熱性フェライト系ステンレス鋼板 |
JP5297713B2 (ja) * | 2008-07-28 | 2013-09-25 | 新日鐵住金ステンレス株式会社 | 加熱後耐食性に優れた自動車排気系部材用省合金型フェライト系ステンレス鋼 |
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2011
- 2011-03-22 JP JP2012508270A patent/JP5709845B2/ja active Active
- 2011-03-22 EP EP11762738.0A patent/EP2554701B1/en active Active
- 2011-03-22 BR BR112012024625A patent/BR112012024625B1/pt active IP Right Grant
- 2011-03-22 KR KR1020127025734A patent/KR101536291B1/ko active IP Right Grant
- 2011-03-22 WO PCT/JP2011/057512 patent/WO2011122513A1/ja active Application Filing
- 2011-03-22 ES ES11762738.0T patent/ES2581315T3/es active Active
- 2011-03-22 CN CN201180017606.0A patent/CN102822373B/zh active Active
- 2011-03-22 US US13/638,108 patent/US20130017116A1/en not_active Abandoned
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Also Published As
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TWI461547B (zh) | 2014-11-21 |
TW201139698A (en) | 2011-11-16 |
BR112012024625B1 (pt) | 2019-01-08 |
CN102822373A (zh) | 2012-12-12 |
KR101536291B1 (ko) | 2015-07-13 |
JP5709845B2 (ja) | 2015-04-30 |
KR20120127737A (ko) | 2012-11-23 |
BR112012024625A2 (pt) | 2016-05-31 |
CN102822373B (zh) | 2016-07-06 |
EP2554701A1 (en) | 2013-02-06 |
US20130017116A1 (en) | 2013-01-17 |
ES2581315T3 (es) | 2016-09-05 |
EP2554701A4 (en) | 2015-04-29 |
WO2011122513A1 (ja) | 2011-10-06 |
JPWO2011122513A1 (ja) | 2013-07-08 |
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