WO2022139276A1 - 경화능이 우수한 마르텐사이트계 스테인리스강 - Google Patents
경화능이 우수한 마르텐사이트계 스테인리스강 Download PDFInfo
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- WO2022139276A1 WO2022139276A1 PCT/KR2021/018705 KR2021018705W WO2022139276A1 WO 2022139276 A1 WO2022139276 A1 WO 2022139276A1 KR 2021018705 W KR2021018705 W KR 2021018705W WO 2022139276 A1 WO2022139276 A1 WO 2022139276A1
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- stainless steel
- martensitic stainless
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 29
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 24
- 239000002244 precipitate Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- 239000011572 manganese Substances 0.000 description 14
- 239000010949 copper Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 229910001220 stainless steel Inorganic materials 0.000 description 9
- 239000010935 stainless steel Substances 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 8
- 229910000734 martensite Inorganic materials 0.000 description 8
- 239000011651 chromium Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- VXZBYIWNGKSFOJ-UHFFFAOYSA-N 2-[4-[5-(2,3-dihydro-1H-inden-2-ylamino)pyrazin-2-yl]pyrazol-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC=1N=CC(=NC=1)C=1C=NN(C=1)CC(=O)N1CC2=C(CC1)NN=N2 VXZBYIWNGKSFOJ-UHFFFAOYSA-N 0.000 description 1
- DFGKGUXTPFWHIX-UHFFFAOYSA-N 6-[2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]acetyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)C1=CC2=C(NC(O2)=O)C=C1 DFGKGUXTPFWHIX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- C22C38/02—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
- C22C38/18—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
- C22C38/001—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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21D2211/008—Martensite
Definitions
- the present invention relates to martensitic stainless steel having excellent hardenability, and more particularly, to martensitic stainless steel showing excellent hardenability due to a small hardness variation.
- a material for a disk used in a two-wheeled vehicle requires high hardness to prevent abrasion of the disk, and thus, martensitic stainless steel with high hardness is mainly used.
- the martensitic stainless steel When the martensitic stainless steel is manufactured as a plate, it consists of a ferrite phase and precipitates, and is punched into a disk shape and then hardened and heat treated. In hardening heat treatment, the ferrite phase is heated to a temperature at which the austenite phase is transformed, maintained for a certain period of time, and then rapidly cooled to form a martensite phase. When the martensitic phase is formed, a high hardness suitable for a two-wheeled vehicle disc is obtained.
- Embodiments of the present invention it is intended to provide a martensitic stainless steel showing excellent hardenability with a small hardness variation.
- Martensitic stainless steel having excellent hardenability is, by weight, C: 0.01 to 0.1%, Si: 0.05 to 1.0%, Mn: 0.05 to 1.0%, Cr: 11.0 to 14.0%, Ni: 0.05 to 1.0%, Cu: 0.05% to 2.0%, N: 0.04% to 0.08%, the remaining Fe and unavoidable impurities are included, and the following formula (1) is satisfied.
- Mn, Ni, and Cu mean the content (wt%) of each element.
- the area fraction of the ferrite phase in an arbitrary cross section of the martensitic stainless steel having excellent hardenability according to an embodiment of the present invention may be 20% or less.
- the number of precipitates having a long axis of more than 1 ⁇ m may be 2/100 ⁇ m 2 or less.
- the Rockwell hardness deviation in any cross-section may be 2.0 or less.
- the martensitic stainless steel according to the embodiment of the present invention can reduce the area fraction of the ferrite phase or the number of coarse precipitates by controlling the component system, the hardness deviation can be reduced to improve hardenability.
- FIG. 1 is a photograph of observing a ferrite phase and a martensitic phase with respect to a cross section of a conventional martensitic stainless steel.
- FIG. 2 is a photograph of observing a ferrite phase and a martensitic phase with respect to a cross section of a martensitic stainless steel according to an embodiment of the present invention.
- FIG 3 is a photograph observing the precipitates in the cross section of the martensitic stainless steel according to an embodiment of the present invention.
- Martensitic stainless steel having excellent hardenability is, by weight, C: 0.01 to 0.1%, Si: 0.05 to 1.0%, Mn: 0.05 to 1.0%, Cr: 11.0 to 14.0%, Ni: 0.05 to 1.0%, Cu: 0.05% to 2.0%, N: 0.04% to 0.08%, the remaining Fe and unavoidable impurities are included, and the following formula (1) is satisfied.
- Mn, Ni, and Cu mean the content (wt%) of each element.
- Martensitic stainless steel having excellent hardenability is, by weight, C: 0.01 to 0.1%, Si: 0.05 to 1.0%, Mn: 0.05 to 1.0%, Cr: 11.0 to 14.0%, Ni: 0.05 to 1.0%, Cu: 0.05% to 2.0%, N: 0.04% to 0.08%, remaining Fe and unavoidable impurities.
- the unit is % by weight.
- the content of C (carbon) is 0.01 to 0.1%.
- C is an element that greatly affects the hardness. If the content is less than 0.01%, the desired level of hardness cannot be obtained, and if it exceeds 0.1%, the hardness is excessive and exceeds the level of hardness required for disk use.
- the content of Si is 0.05 to 1.0%.
- Si is an element that can improve corrosion resistance, and is added by 0.05% or more. However, if the content exceeds 1.0%, toughness during manufacturing may be impaired, and the upper limit thereof is limited to 1.0% or less.
- the content of Mn (manganese) is 0.05 to 1.0%.
- Mn is an element that helps to form an austenite phase during hardening heat treatment, and is added in an amount of 0.05% or more. If the content of Mn exceeds 1.0%, corrosion resistance may be impaired, and the upper limit thereof is set to 1.0% or less.
- the content of Cr (chromium) is 11.0 to 14.0%.
- Cr is an element that improves the corrosion resistance of steel, and is added 11.0% or more. However, when the content is excessive, the upper limit is limited to 14.0% or less because it becomes a major factor in increasing the size of the precipitate.
- Ni nickel
- Ni is an element that helps to form an austenite phase during hardening heat treatment, and is added in an amount of 0.05% or more.
- Ni is an expensive element, and since it causes a cost increase when a large amount of Ni is added, the upper limit is set to 1.0% or less.
- the content of Cu (copper) is 0.05 to 2.0%.
- Cu is an element that helps to form an austenite phase during hardening heat treatment, and is added in an amount of 0.05% or more in the present invention. However, if the content is excessive, the cost increases, so the upper limit is limited to 2.0% or less.
- N nitrogen
- N is an element that controls the hardness of the disk, and contains 0.04% or more. When the content of N exceeds 0.08%, the hardness is excessive and exceeds the level of hardness required for disk use.
- the remainder of the stainless steel except for the above-mentioned alloying elements consists of Fe and other unavoidable impurities.
- the hardness deviation by location of stainless steel is because there is a phase other than the martensite phase in the phase constituting the hardened and heat-treated stainless steel. If the ferrite phase constituting the stainless steel before hardening heat treatment is not sufficiently transformed into an austenite phase during hardening heat treatment, the ferrite phase remains after hardening heat treatment, which increases the hardness deviation.
- Equation (1) a range of components capable of reducing the area fraction of the residual ferrate phase after curing heat treatment was derived using Equation (1).
- Mn, Ni, and Cu mean the content (wt%) of each element.
- the ferrite phase can be sufficiently transformed into an austenite phase during hardening heat treatment, and the area fraction of the ferrite phase is below a certain level, so that the hardness deviation is controlled to an appropriate level or less.
- the area fraction of the ferrite phase remaining after curing heat treatment is 20% or less in an arbitrary cross section, and preferably 10% or less.
- the arbitrary cross-section means a surface cut out of the martensitic stainless steel in an arbitrary direction after hardening heat treatment, and specifically, the arbitrary cross-section means a surface parallel to the longitudinal direction of the precipitate having a long axis of more than 1 ⁇ m. .
- Equation (1) when the value of Equation (1) is 1.0 to 2.5, the number of coarse precipitates generated before hardening heat treatment can be reduced, and the ferrite phase can be prevented from remaining after hardening heat treatment, thereby reducing hardness deviation.
- the number of precipitates having a long axis of more than 1 ⁇ m before curing heat treatment may be present in an arbitrary cross section in an amount of 2/100 ⁇ m 2 or less.
- the arbitrary cross-section means a surface cut in an arbitrary direction before hardening heat treatment of martensitic stainless steel.
- the hardness deviation expressed by Equation (2) may be 2 or less.
- Equation (2) When the value of Equation (2) is 2 or less, the hardness of the martensitic stainless steel is uniform, so that abrasion of the pad rubbing against the disk during braking can be reduced, and the target braking performance can be secured.
- Stainless steel was cast using the alloy composition system shown in Table 1 below and hot rolling was performed to a thickness of 4 mm.
- the hot-rolled thickness may vary depending on the application.
- the austenite phase formed during hot rolling was transformed into a ferrite phase by maintaining it at about 750° C. for about 20 hours.
- the size ( ⁇ m) and distribution density (pieces / 100 ⁇ m 2 ) of the precipitates were measured for the stainless steel prepared in this way.
- the size and distribution density of the precipitates can be found by observing the remaining tissues except for the precipitates with a scanning electron microscope after etching.
- As the etching method a method commonly used in academia or industry may be used.
- the area fraction of the ferrite phase can be confirmed by observing an arbitrary cross section with electron backscatter diffraction mounted on a scanning electron microscope and then displaying the image quality map. can be checked using
- the steel grades of Examples 1 to 8 satisfies the value of Equation (1) of 1.0 to 2.5, and in any cross-section before the reinforcement heat treatment, there were 2 precipitates with the length of the major axis greater than 1 ⁇ m/100 ⁇ m. 2 or less, and the area fraction of the ferrite phase was 20% or less in any cross section after strengthening heat treatment, confirming that the hardness deviation was 2 or less.
- Comparative Examples 2 and 4 did not satisfy the component range of the present invention, and the value of Equation (1) was 0.6 or less, so that the area fraction of the ferrite phase exceeded 20%, and the long axis length of the precipitates was greater than 1 ⁇ m. It was found to be more than 5/100 ⁇ m 2 .
- the hardness deviation was also shown as 10 or more, confirming that the hardness deviation increased as the value of Equation (1) was farther from the range of 1.0 to 2.5.
- FIG. 1 is a photograph of observing a ferrite phase and a martensitic phase for a cross section of a conventional martensitic stainless steel
- FIG. 2 is a ferritic phase and martensite for a cross section of a martensitic stainless steel according to Example 1 of the present invention This is a picture of the award.
- the bright regions represent the ferrite phase
- the dark, needle-filled regions represent the martensitic phase
- the area fraction of the ferrite phase exceeds 20%.
- the area fraction of the ferrite phase hardly exists at 20% or less.
- Example 3 is a photograph observing the precipitates in the cross section of the martensitic stainless steel according to Example 1 of the present invention.
- the number of precipitates having a long axis of more than 1 ⁇ m is 2/100 ⁇ m 2 or less, and fine precipitates having a long axis of 1 ⁇ m or less exist.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Braking Arrangements (AREA)
Abstract
Description
구분 | C | Si | Mn | Cr | Ni | Cu | N | 식 (1) |
비교예1 | 0.04 | 0.3 | 0.3 | 12.7 | 0.3 | 0.3 | 0.03 | 0.9 |
비교예2 | 0.04 | 0.03 | 0.2 | 14.2 | 0.2 | 0.2 | 0.02 | 0.6 |
비교예3 | 0.06 | 0.3 | 0.2 | 14.3 | 0.3 | 0.3 | 0.03 | 0.9 |
비교예4 | 0.04 | 0.3 | 0.2 | 13.1 | 0.1 | 0.1 | 0.01 | 0.4 |
실시예1 | 0.03 | 0.3 | 0.4 | 12.2 | 0.3 | 0.5 | 0.04 | 1.2 |
실시예2 | 0.01 | 0.2 | 0.4 | 12.8 | 0.3 | 0.5 | 0.08 | 1.2 |
실시예3 | 0.03 | 0.3 | 0.5 | 12.3 | 0.2 | 0.9 | 0.05 | 1.6 |
실시예4 | 0.04 | 0.3 | 0.9 | 12.5 | 0.2 | 0.2 | 0.04 | 1.3 |
실시예5 | 0.02 | 0.3 | 0.3 | 12.4 | 0.9 | 0.3 | 0.05 | 1.5 |
실시예6 | 0.03 | 0.4 | 0.3 | 12.1 | 0.3 | 1.4 | 0.05 | 2.0 |
실시예7 | 0.04 | 0.4 | 0.3 | 13.8 | 0.2 | 1.9 | 0.04 | 2.4 |
실시예8 | 0.09 | 0.9 | 0.1 | 11.1 | 0.2 | 0.8 | 0.06 | 1.1 |
구분 | 페라이트상 면적분율(%) | 장축 길이 1μm 초과 석출물(개/100μm2) | 식 (2)[경도 편차] |
비교예1 | 12 | 3 | 4 |
비교예2 | 35 | 10 | 10 |
비교예3 | 11 | 6 | 6 |
비교예4 | 25 | 5 | 15 |
실시예1 | 5 | 1 | 2 |
실시예2 | 8 | 0 | 1.5 |
실시예3 | 6 | 1 | 2 |
실시예4 | 2 | 0 | 0.5 |
실시예5 | 3 | 1 | 1 |
실시예6 | 4 | 0 | 1.5 |
실시예7 | 5 | 2 | 2 |
실시예8 | 4 | 0 | 2 |
Claims (4)
- 중량%로, C: 0.01 내지 0.1%, Si: 0.05 내지 1.0%, Mn: 0.05 내지 1.0%, Cr: 11.0 내지 14.0%, Ni: 0.05 내지 1.0%, Cu: 0.05% 내지 2.0%, N: 0.04% 내지 0.08%, 나머지 Fe 및 불가피한 불순물을 포함하고,하기 식 (1)을 만족하는 경화능이 우수한 마르텐사이트계 스테인리스강.(1) 1.0 ≤ Mn + Ni + Cu ≤ 2.5(여기서, Mn, Ni, Cu는 각 원소의 함량(중량%)을 의미한다.)
- 제1항에 있어서,임의의 단면에서 페라이트상의 면적분율은 20% 이하인 경화능이 우수한 마르텐사이트계 스테인리스강.
- 제1항에 있어서,임의의 단면에서 장축의 길이가 1μm 초과인 석출물이 2개/100μm2 이하인 경화능이 우수한 마르텐사이트계 스테인리스강.
- 제1항에 있어서,임의의 단면에서 로크웰 경도 편차는 2.0 이하인 경화능이 우수한 마르텐사이트계 스테인리스강.
Priority Applications (4)
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US18/268,562 US20240043973A1 (en) | 2020-12-21 | 2021-12-10 | Martensitic stainless steel with excellent hardenability |
CN202180090885.7A CN116783319A (zh) | 2020-12-21 | 2021-12-10 | 具有优异淬透性的马氏体不锈钢 |
JP2023538061A JP2024500890A (ja) | 2020-12-21 | 2021-12-10 | 硬化能に優れたマルテンサイト系ステンレス鋼 |
EP21911343.8A EP4265783A1 (en) | 2020-12-21 | 2021-12-10 | Martensitic stainless steel with excellent hardenability |
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KR10-2020-0179497 | 2020-12-21 | ||
KR1020200179497A KR20220089140A (ko) | 2020-12-21 | 2020-12-21 | 경화능이 우수한 마르텐사이트계 스테인리스강 |
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US (1) | US20240043973A1 (ko) |
EP (1) | EP4265783A1 (ko) |
JP (1) | JP2024500890A (ko) |
KR (1) | KR20220089140A (ko) |
CN (1) | CN116783319A (ko) |
WO (1) | WO2022139276A1 (ko) |
Citations (5)
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JP2001003142A (ja) * | 1999-06-22 | 2001-01-09 | Nippon Steel Corp | ディスクブレーキ用マルテンサイト系ステンレス鋼 |
KR20080106350A (ko) * | 2006-10-05 | 2008-12-04 | 제이에프이 스틸 가부시키가이샤 | 템퍼링 연화 저항과 인성이 우수한 브레이크 디스크 |
US20120048662A1 (en) * | 2003-04-28 | 2012-03-01 | Jfe Steel Corporation | Martensitic stainless steel for disc brakes |
JP2016065301A (ja) * | 2014-09-17 | 2016-04-28 | 新日鐵住金ステンレス株式会社 | ブレーキディスク用マルテンサイト系ステンレス鋼とその製造方法 |
KR20160080000A (ko) * | 2014-12-26 | 2016-07-07 | 주식회사 포스코 | 마르텐사이트계 스테인리스강 및 그 제조 방법 |
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2020
- 2020-12-21 KR KR1020200179497A patent/KR20220089140A/ko not_active IP Right Cessation
-
2021
- 2021-12-10 US US18/268,562 patent/US20240043973A1/en active Pending
- 2021-12-10 CN CN202180090885.7A patent/CN116783319A/zh active Pending
- 2021-12-10 EP EP21911343.8A patent/EP4265783A1/en active Pending
- 2021-12-10 WO PCT/KR2021/018705 patent/WO2022139276A1/ko active Application Filing
- 2021-12-10 JP JP2023538061A patent/JP2024500890A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001003142A (ja) * | 1999-06-22 | 2001-01-09 | Nippon Steel Corp | ディスクブレーキ用マルテンサイト系ステンレス鋼 |
US20120048662A1 (en) * | 2003-04-28 | 2012-03-01 | Jfe Steel Corporation | Martensitic stainless steel for disc brakes |
KR20080106350A (ko) * | 2006-10-05 | 2008-12-04 | 제이에프이 스틸 가부시키가이샤 | 템퍼링 연화 저항과 인성이 우수한 브레이크 디스크 |
JP2016065301A (ja) * | 2014-09-17 | 2016-04-28 | 新日鐵住金ステンレス株式会社 | ブレーキディスク用マルテンサイト系ステンレス鋼とその製造方法 |
KR20160080000A (ko) * | 2014-12-26 | 2016-07-07 | 주식회사 포스코 | 마르텐사이트계 스테인리스강 및 그 제조 방법 |
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US20240043973A1 (en) | 2024-02-08 |
EP4265783A1 (en) | 2023-10-25 |
KR20220089140A (ko) | 2022-06-28 |
CN116783319A (zh) | 2023-09-19 |
JP2024500890A (ja) | 2024-01-10 |
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