WO2018117489A1 - 강도 및 내산성이 우수한 페라이트계 스테인리스강 및 이의 제조 방법 - Google Patents
강도 및 내산성이 우수한 페라이트계 스테인리스강 및 이의 제조 방법 Download PDFInfo
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- WO2018117489A1 WO2018117489A1 PCT/KR2017/014205 KR2017014205W WO2018117489A1 WO 2018117489 A1 WO2018117489 A1 WO 2018117489A1 KR 2017014205 W KR2017014205 W KR 2017014205W WO 2018117489 A1 WO2018117489 A1 WO 2018117489A1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- 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 a ferritic stainless steel and a method for producing the same, and more particularly to a ferritic stainless steel and its manufacturing method excellent in strength and acid resistance.
- ferritic stainless steels are widely used in building materials, kitchen containers, home appliances, automobile exhaust systems, and the like.
- Ferritic stainless steels have recently been applied to automotive battery cells, and automobile companies require higher strength and corrosion resistance than conventional ferritic stainless steels to guarantee long-term battery performance. We demand material of price.
- the method of increasing the strength of ferritic stainless steel to satisfy the demands of such automobile companies includes methods such as work hardening, solid solution strengthening, and precipitation hardening. Due to the characteristics of ferritic stainless steel without phase transformation, there is a problem in that workability decreases rapidly during work hardening. Mo, Nb and the like which are excellent in effects are difficult to utilize as expensive elements.
- C is an element that impairs the workability of ferritic stainless steel, and is managed to be lower than 0.02wt% unless it is a special use.
- C is an element that impairs the workability of ferritic stainless steel, and is managed to be lower than 0.02wt% unless it is a special use.
- the strength of ferritic stainless steel may be improved due to the precipitation of carbides, and if the ductility is secured to some extent through recent developments in processing technology, strength and processability may be simultaneously obtained.
- Patent Document 0001 Japanese Laid-Open Patent Publication No. 2006-183081
- Embodiments of the present invention are to provide an excellent ferritic stainless steel that can improve the strength and acid resistance through controlling the alloy components of the ferritic stainless steel by controlling the precipitates and grains of the ferritic stainless steel.
- embodiments of the present invention to provide a method for producing a ferritic stainless steel that can improve the strength and acid resistance through the control of precipitates and grains by controlling the slab reheating temperature, reduction rate and winding temperature during hot rolling.
- Ferritic stainless steel having excellent strength and acid resistance according to an embodiment of the present invention, in weight%, carbon (C): 0.1 to 0.2%, nitrogen (N): 0.005 to 0.05%, manganese (Mn): 0.01 to 0.5%, chromium (Cr): 12.0 to 19.0%, nickel (Ni): 0.01 to 0.5%, copper (Cu): 0.3 to 1.5%, containing the remaining iron (Fe) and other unavoidable impurities, the diameter of 100nm or more The number of branches is 50 to 200ea / 100 ⁇ m 2 per unit area of carbide.
- the average grain diameter may be 10 ⁇ m or less.
- the tensile strength may be 520MPa or more.
- the elongation may be 20% or more.
- the critical current density I crit may be 10 mA or less in a 5% sulfuric acid atmosphere.
- Method for producing a ferritic stainless steel excellent in strength and acid resistance according to an embodiment of the present invention, in weight%, carbon (C): 0.1 to 0.2%, nitrogen (N): 0.005 to 0.05%, manganese (Mn): Ferritic stainless steel containing 0.01 to 0.5%, chromium (Cr): 12.0 to 19.0%, nickel (Ni): 0.01 to 0.5%, copper (Cu): 0.3 to 1.5%, remaining iron (Fe) and other unavoidable impurities It includes the step of hot rolling and cold rolling the steel slab, the value of the following formula (1) at the time of hot rolling satisfies 1,000 or less.
- RHT (°C) means the slab reheating temperature
- R4 (%) means the reduction ratio of the R4 stand of rough rolling
- CT (°C) means the winding temperature.
- the value of the formula (1) may satisfy 800 to 1,000.
- RHT is less than 1,250 °C
- R4 is 40% or more
- CT may be less than 650 °C.
- the cold rolled sheet material may be 50 to 200ea / 100 ⁇ m 2 per unit area of the carbide having a diameter of 100nm or more, the average grain diameter may be 10 ⁇ m or less.
- Embodiments of the present invention can improve the strength and acid resistance of the ferritic stainless steel through controlling the alloy components and hot rolling conditions of the ferritic stainless steel by controlling the precipitates and grains.
- 1 is a graph for explaining the correlation between the hot rolling conditions of the ferritic stainless steel and the number of carbides of the cold rolled steel sheet.
- TEM 2 is a photograph taken through the transmission electron microscope (TEM) of the precipitate distribution state of the ferritic stainless steel cold rolled steel sheet according to an embodiment of the present invention.
- TEM 3 is a photograph taken through the transmission electron microscope (TEM) of the precipitate distribution state of the ferritic stainless steel cold rolled steel sheet according to a comparative example of the present invention.
- Ferritic stainless steel having excellent strength and acid resistance according to an embodiment of the present invention, in weight%, carbon (C): 0.1 to 0.2%, nitrogen (N): 0.005 to 0.05%, manganese (Mn): 0.01 to 0.5%, chromium (Cr): 12.0 to 19.0%, nickel (Ni): 0.01 to 0.5%, copper (Cu): 0.3 to 1.5%, containing the remaining iron (Fe) and other unavoidable impurities, the diameter of 100nm or more The number of branches is 50 to 200ea / 100 ⁇ m 2 per unit area of carbide.
- Ferritic stainless steel having excellent strength and acid resistance according to an embodiment of the present invention, in weight%, carbon (C): 0.1 to 0.2%, nitrogen (N): 0.005 to 0.05%, manganese (Mn): 0.01 to 0.5%, chromium (Cr): 12.0 to 19.0%, nickel (Ni): 0.01 to 0.50%, copper (Cu): 0.3 to 1.5%, remaining iron (Fe) and other unavoidable impurities.
- the amount of carbon (C) is from 0.1 to 0.2%. If the amount of carbon (C) is less than 0.1%, there is a problem that the amount of austenite produced during hot rolling is reduced and the ferrite band structure is not destroyed and the grain size is increased, thus increasing the tensile strength of the final cold rolled product. There is a problem that the strength is lowered below 500 MPa. In addition, when the amount of carbon (C) is greater than 0.2%, the carbide of the material increases too much, the elongation of the final product is lowered, there is a problem that the surface quality and corrosion resistance is lowered by the dropping of carbides.
- the amount of nitrogen (N) is 0.005 to 0.05%. If the amount of nitrogen (N) is less than 0.005%, the manufacturing cost increases due to the increase in refining time and the shortening of the refractory life, and also the low degree of supercooling during casting lowers the slab equiaxed crystal ratio, and the amount of nitrogen (N) is 0.05 If it is more than%, it is highly likely that pinholes by nitrogen occur during slab casting, and the number of Cr 2 N precipitates per unit area in the final cold rolled product increases, resulting in a chromium depleted zone formed around the Cr 2 N precipitates. The formation of multiple pits on the surface of the cold rolled product results in poor surface quality.
- the amount of manganese (Mn) is 0.01 to 0.5%. If the amount of manganese (Mn) is less than 0.01%, there is a problem that the refining price is expensive, if the amount of manganese (Mn) is more than 0.5%, there is a problem that the elongation and corrosion resistance is inferior.
- the amount of chromium (Cr) is 12.0 to 19.0%. If the amount of chromium (Cr) is less than 12.0%, there is a problem of poor corrosion resistance, and if the amount of chromium (Cr) is more than 19.0%, the elongation is lowered and there is a problem that a hot rolled sticking defect occurs.
- the amount of nickel (Ni) is 0.01 to 0.50%. If the amount of nickel (Ni) is less than 0.01%, there is a problem that the refining price is expensive, if the amount of nickel (Ni) is more than 0.5%, there is a problem that the impurities of the material increases and the elongation is lowered.
- the amount of copper (Cu) is 0.3 to 1.5%. If the amount of copper (Cu) is less than 0.3%, the critical current density (I crit ) is more than 10 mA in 5% sulfuric acid atmosphere and sufficient acid resistance cannot be secured. If the amount of copper (Cu) is more than 1.5% Not only does the price go too high, it also leads to a decrease in hot workability and a drop in elongation of the final product.
- Ferritic stainless steel having excellent strength and acid resistance has a number of carbides having a diameter of 100 nm or more per unit area of 50ea / 100 ⁇ m 2 or more.
- the carbide may be an M 23 C 6 type carbide based metal precipitate.
- the slab reheating temperature, rough rolling reduction rate, and hot rolled coil winding temperature must be controlled during the hot rolling process, which will be described later.
- the number of carbides having a diameter of 100 nm or more may be 50ea / 100 ⁇ m 2 or more through the control of the hot rolling process conditions, and by securing a large number of fine carbides, tensile strength of 520 MPa or more may be secured. If the above process conditions are exceeded, the carbides become coarse and the amount of carbides cannot be sufficiently obtained.
- the amount of carbides is small, resulting in coarsening of grains and lowering tensile strength.
- the ferritic stainless steel may have an average grain diameter of 10 ⁇ m or less.
- the ferritic stainless steel according to an embodiment of the present invention may have a tensile strength of 520 MPa or more.
- the ferritic stainless steel according to one embodiment of the present invention may have an elongation of 20% or more.
- the ferritic stainless steel according to an embodiment of the present invention may have a critical current density I crit of 10 mA or less in a 5% sulfuric acid atmosphere.
- RHT (°C) means the slab reheating temperature
- R4 (%) means the reduction ratio of the R4 stand of rough rolling
- CT (°C) means the winding temperature.
- the slab reheat temperature (RHT) is less than 1,250 ° C
- the rolling reduction R4 of the roughly rolled R4 stand is 40% or more
- the coiling temperature (CT) is performed at less than 650 ° C, wherein hot Rolling conditions are performed so that the value of said Formula (1) may satisfy 1,000 or less.
- 1 is a graph for explaining the correlation between the hot rolling conditions of the ferritic stainless steel and the number of carbides of the cold rolled steel sheet.
- the coiling temperature is higher than 650 °C, the coarsening of the precipitate occurs, the desired number of carbides can not be obtained, thereby grains are coarse and the desired tensile strength in the final product is not obtained.
- the value of Formula (1) may satisfy 800 to 1,000.
- the value of the formula (1) is less than 800, the temperature during the hot rolling is too low can lead to plate-like defects.
- the hot rolled sheet is subjected to an annealing process, in which the carbide is sufficiently precipitated through annealing heat treatment at a temperature of 700 to 900 ° C.
- the annealing heat treatment may be performed by a BAF annealing process.
- the cold rolled sheet material having a thickness of less than 2mm through cold rolling may be manufactured and the final heat treatment may be performed by heat treatment at a temperature of 800 to 900 °C.
- the cold rolled sheet material may be 50ea / 100 ⁇ m 2 or more per unit area of the carbide having a diameter of 100nm or more, the average grain diameter may be 10 ⁇ m or less.
- a TEM replica was made on the final produced cold rolled sheet to measure the number of carbide precipitates per unit area (100 ⁇ m 2 ).
- TEM 2 is a photograph taken through the transmission electron microscope (TEM) of the precipitate distribution state of the ferritic stainless steel cold rolled steel sheet according to an embodiment of the present invention.
- 3 is a photograph taken through the transmission electron microscope (TEM) of the precipitate distribution state of the ferritic stainless steel cold rolled steel sheet according to a comparative example of the present invention.
- FIG. 2 is a photograph of a cold rolled steel sheet according to Example 2
- FIG. 3 is a photograph of a cold rolled steel sheet according to Comparative Example 2.
- the number of carbides and the tensile strength of the cold rolled steel sheets according to the embodiments and the comparative examples are shown in a graph. As the number of carbides increases, the tensile strength also tends to increase.
- Ferritic stainless steel and its manufacturing method excellent in strength and acid resistance according to embodiments of the present invention is applicable to building materials, kitchen containers, home appliances, automotive exhaust system parts, automotive batteries and the like.
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Abstract
Description
| C | N | Mn | Cr | Ni | Cu | |
| 발명강 1 | 0.103 | 0.014 | 0.13 | 14.3 | 0.11 | 0.67 |
| 발명강 2 | 0.171 | 0.016 | 0.11 | 17.2 | 0.09 | 0.45 |
| 발명강 3 | 0.122 | 0.006 | 0.24 | 16.7 | 0.13 | 1.21 |
| 발명강 4 | 0.125 | 0.008 | 0.19 | 16.5 | 0.12 | 1.05 |
| 비교강 1 | 0.133 | 0.012 | 0.23 | 17.5 | 0.15 | 1.79 |
| 비교강 2 | 0.147 | 0.015 | 0.24 | 16.9 | 0.17 | 0.14 |
| 비교강 3 | 0.227 | 0.022 | 0.15 | 17.1 | 0.21 | 0.84 |
| 비교강 4 | 0.232 | 0.017 | 0.14 | 17.6 | 0.11 | 0.66 |
| 비교강 5 | 0.042 | 0.046 | 0.21 | 16.2 | 0.11 | 0.12 |
| 비교강 6 | 0.051 | 0.042 | 0.15 | 15.2 | 0.13 | 0.23 |
| 비교강 7 | 0.047 | 0.041 | 0.17 | 16.9 | 0.14 | 0.77 |
| 비교강 8 | 0.062 | 0.015 | 0.16 | 17.3 | 0.13 | 0.81 |
| 비교강 9 | 0.085 | 0.015 | 0.25 | 18.1 | 0.15 | 0.67 |
| 강종 | RHT(℃) | CT(℃) | R4(%) | 15*RHT/R4+CT | |
| 실시예 1 | 발명강 1 | 1,130 | 550 | 45 | 927 |
| 실시예 2 | 발명강 2 | 1,130 | 550 | 45 | 927 |
| 실시예 3 | 발명강 3 | 1,180 | 550 | 45 | 943 |
| 실시예 4 | 발명강 4 | 1,180 | 580 | 45 | 973 |
| 비교예 1 | 발명강 1 | 1,250 | 550 | 30 | 1,175 |
| 비교예 2 | 발명강 2 | 1,180 | 650 | 30 | 1,240 |
| 비교예 3 | 발명강 3 | 1,180 | 580 | 30 | 1,170 |
| 비교예 4 | 발명강 4 | 1,250 | 550 | 40 | 1,019 |
| 비교예 5 | 비교강 1 | 1,130 | 550 | 45 | 927 |
| 비교예 6 | 비교강 2 | 1,130 | 580 | 45 | 957 |
| 비교예 7 | 비교강 3 | 1,180 | 550 | 45 | 943 |
| 비교예 8 | 비교강 4 | 1,180 | 580 | 45 | 973 |
| 비교예 9 | 비교강 5 | 1,180 | 650 | 30 | 1,240 |
| 비교예 10 | 비교강 6 | 1,130 | 550 | 45 | 927 |
| 비교예 11 | 비교강 7 | 1,180 | 550 | 45 | 943 |
| 비교예 12 | 비교강 8 | 1,180 | 650 | 45 | 1,043 |
| 비교예 13 | 비교강 9 | 1,250 | 650 | 30 | 1,275 |
| 탄화물의 개수 (ea/100㎛2) | 평균 결정립 지름 (㎛) | 연신율(%) | 인장강도 (MPa) | 5% 황산 분위기에서 임계전류밀도 (mA) | |
| 실시예 1 | 91 | 6.8 | 25.7 | 529 | 5.6 |
| 실시예 2 | 124 | 5.9 | 23.9 | 531 | 7.2 |
| 실시예 3 | 72 | 7.4 | 25.3 | 542 | 3.7 |
| 실시예 4 | 75 | 8.1 | 26.7 | 537 | 3.5 |
| 비교예 1 | 32 | 10.8 | 27.6 | 498 | 8.5 |
| 비교예 2 | 45 | 11.6 | 25.3 | 508 | 5.9 |
| 비교예 3 | 37 | 10.5 | 26.7 | 515 | 4.2 |
| 비교예 4 | 41 | 12.1 | 27.2 | 498 | 4.5 |
| 비교예 5 | 81 | 6.5 | 18.8 | 554 | 3.1 |
| 비교예 6 | 107 | 5.4 | 25.7 | 527 | 14.5 |
| 비교예 7 | 227 | 4.8 | 18.5 | 567 | 6.9 |
| 비교예 8 | 305 | 5.3 | 19.2 | 572 | 7.5 |
| 비교예 9 | 13 | 18.1 | 30.1 | 457 | 15.6 |
| 비교예 10 | 19 | 17.3 | 29.8 | 453 | 13.8 |
| 비교예 11 | 28 | 20.6 | 28.9 | 476 | 6.3 |
| 비교예 12 | 21 | 14.1 | 27.7 | 481 | 5.4 |
| 비교예 13 | 26 | 12.0 | 26.3 | 491 | 4.2 |
Claims (9)
- 중량%로, 탄소(C): 0.1 내지 0.2%, 질소(N): 0.005 내지 0.05%, 망간(Mn): 0.01 내지 0.5%, 크롬(Cr): 12.0 내지 19.0%, 니켈(Ni): 0.01 내지 0.5%, 구리(Cu): 0.3 내지 1.5%, 나머지 철(Fe) 및 기타 불가피한 불순물을 포함하며, 100nm 이상의 지름을 가지는 탄화물의 단위 면적당 개수가 50 내지 200ea/100㎛2인 강도 및 내산성이 우수한 페라이트계 스테인리스강.
- 제1항에 있어서,평균 결정립 지름이 10㎛ 이하인 강도 및 내산성이 우수한 페라이트계 스테인리스강.
- 제1항에 있어서,인장강도가 520MPa 이상인 강도 및 내산성이 우수한 페라이트계 스테인리스강.
- 제1항에 있어서,연신율이 20% 이상인 강도 및 내산성이 우수한 페라이트계 스테인리스강.
- 제1항에 있어서,5% 황산 분위기에서 임계전류밀도(Icrit)가 10mA 이하인 강도 및 내산성이 우수한 페라이트계 스테인리스강.
- 중량%로, 탄소(C): 0.1 내지 0.2%, 질소(N): 0.005 내지 0.05%, 망간(Mn): 0.01 내지 0.5%, 크롬(Cr): 12.0 내지 19.0%, 니켈(Ni): 0.01 내지 0.5%, 구리(Cu): 0.3 내지 1.5%, 나머지 철(Fe) 및 기타 불가피한 불순물을 포함하는 페라이트계 스테인리스강 슬라브를 열간 압연하는 단계 및 냉간 압연하는 단계를 포함하며,열간 압연시 하기 식 (1)의 값이 1,000 이하를 만족하는 강도 및 내산성이 우수한 페라이트계 스테인리스강의 제조 방법.15*RHT/R4+CT ------ 식 (1)여기서, RHT(℃)는 슬라브 재가열 온도를 의미하며, R4(%)는 조압연의 R4 스탠드의 압하율을 의미하며, CT(℃)는 권취 온도를 의미한다.
- 제6항에 있어서,상기 식 (1)의 값은 800 내지 1,000을 만족하는 강도 및 내산성이 우수한 페라이트계 스테인리스강의 제조 방법.
- 제6항에 있어서,RHT는 1,250℃ 미만이며, R4는 40% 이상이며, CT는 650℃ 미만인 강도 및 내산성이 우수한 페라이트계 스테인리스강의 제조 방법.
- 제6항에 있어서,냉연 판재는 100nm 이상의 지름을 가지는 탄화물의 단위 면적당 개수가 50 내지 200ea/100㎛2이며, 평균 결정립 지름이 10㎛ 이하인 강도 및 내산성이 우수한 페라이트계 스테인리스강의 제조 방법.
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| JP2019534678A JP6894515B2 (ja) | 2016-12-23 | 2017-12-06 | フェライト系ステンレス冷延鋼板およびその製造方法 |
| US16/473,044 US20200087745A1 (en) | 2016-12-23 | 2017-12-06 | Ferritic stainless steel having excellent strength and corrosion resistance to acid and method of manufacturing the same |
| CN201780084405.XA CN110199049B (zh) | 2016-12-23 | 2017-12-06 | 具有优异的强度和耐酸腐蚀性的铁素体不锈钢及其制造方法 |
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| CN112739842A (zh) * | 2018-09-19 | 2021-04-30 | 株式会社Posco | 具有优异的可加工性和高温强度的基于铁素体的不锈钢及其制造方法 |
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| CN119340568A (zh) * | 2024-12-18 | 2025-01-21 | 深圳市豪鹏科技股份有限公司 | 一种卷绕纽扣电池及电声装置 |
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| KR101903182B1 (ko) | 2018-10-01 |
| US20200087745A1 (en) | 2020-03-19 |
| JP6894515B2 (ja) | 2021-06-30 |
| CN110199049B (zh) | 2021-07-09 |
| JP2020509217A (ja) | 2020-03-26 |
| MX2019007636A (es) | 2019-12-09 |
| KR20180073915A (ko) | 2018-07-03 |
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