SK286725B6 - Nástrojová oceľ, spôsob výroby dielcov z tejto ocele a dielec z ocele alebo získaný uvedeným spôsobom - Google Patents
Nástrojová oceľ, spôsob výroby dielcov z tejto ocele a dielec z ocele alebo získaný uvedeným spôsobom Download PDFInfo
- Publication number
- SK286725B6 SK286725B6 SK1299-2003A SK12992003A SK286725B6 SK 286725 B6 SK286725 B6 SK 286725B6 SK 12992003 A SK12992003 A SK 12992003A SK 286725 B6 SK286725 B6 SK 286725B6
- Authority
- SK
- Slovakia
- Prior art keywords
- steel
- titanium
- zirconium
- melt
- composition
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910001315 Tool steel Inorganic materials 0.000 title claims abstract description 5
- 239000010936 titanium Substances 0.000 claims abstract description 45
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 34
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 33
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 32
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000000161 steel melt Substances 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims description 14
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims description 11
- 239000011733 molybdenum Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- -1 tungsten carbide carbides Chemical class 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 6
- 239000010955 niobium Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 150000001247 metal acetylides Chemical class 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910052721 tungsten Inorganic materials 0.000 description 6
- 239000010937 tungsten Substances 0.000 description 6
- 238000005496 tempering Methods 0.000 description 5
- 239000011572 manganese Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000822 Cold-work tool steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C22C38/18—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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Articles (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0105225A FR2823768B1 (fr) | 2001-04-18 | 2001-04-18 | Acier a outils a tenacite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues |
| PCT/FR2002/001302 WO2002083966A1 (fr) | 2001-04-18 | 2002-04-16 | Acier a outils a tenecite renforcee, procede de fabrication de pieces dans cet acier et pieces obtenues |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SK12992003A3 SK12992003A3 (sk) | 2004-03-02 |
| SK286725B6 true SK286725B6 (sk) | 2009-04-06 |
Family
ID=8862415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SK1299-2003A SK286725B6 (sk) | 2001-04-18 | 2002-04-16 | Nástrojová oceľ, spôsob výroby dielcov z tejto ocele a dielec z ocele alebo získaný uvedeným spôsobom |
Country Status (25)
| Country | Link |
|---|---|
| US (1) | US7445750B1 (cs) |
| EP (1) | EP1379706B1 (cs) |
| JP (1) | JP4523230B2 (cs) |
| KR (1) | KR100846815B1 (cs) |
| CN (1) | CN1226441C (cs) |
| AR (1) | AR033220A1 (cs) |
| AT (1) | ATE282721T1 (cs) |
| AU (1) | AU2002257862B2 (cs) |
| BR (1) | BR0209018B1 (cs) |
| CA (1) | CA2444175C (cs) |
| CZ (1) | CZ297762B6 (cs) |
| DE (1) | DE60201984T2 (cs) |
| ES (1) | ES2231691T3 (cs) |
| FR (1) | FR2823768B1 (cs) |
| HU (1) | HU228835B1 (cs) |
| MX (1) | MXPA03009445A (cs) |
| MY (1) | MY127296A (cs) |
| PL (1) | PL197554B1 (cs) |
| PT (1) | PT1379706E (cs) |
| RU (1) | RU2279494C2 (cs) |
| SK (1) | SK286725B6 (cs) |
| TW (1) | TW554050B (cs) |
| UA (1) | UA74258C2 (cs) |
| WO (1) | WO2002083966A1 (cs) |
| ZA (1) | ZA200307900B (cs) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003289470A1 (en) * | 2002-12-25 | 2004-07-22 | Hitachi Metals, Ltd. | Cold die steel excellent in characteristic of suppressing dimensional change |
| ATE510038T1 (de) * | 2007-01-12 | 2011-06-15 | Rovalma Sa | Kaltarbeitswerkzeugstahl mit hervorragender schweissbarkeit |
| CN101215671B (zh) * | 2008-01-11 | 2010-08-04 | 北京工业大学 | 抗锌液腐蚀磨损材料及其制造方法 |
| RU2382112C1 (ru) * | 2008-05-27 | 2010-02-20 | ОАО "Златоустовский металлургический завод" | Ножевая сталь |
| RU2393264C1 (ru) * | 2009-03-13 | 2010-06-27 | Юлия Алексеевна Щепочкина | Сталь |
| CN103834872A (zh) * | 2012-11-26 | 2014-06-04 | 天工爱和特钢有限公司 | 高耐磨性模具钢 |
| CN103014518B (zh) * | 2012-12-10 | 2015-09-16 | 马鞍山市恒达耐磨材料有限责任公司 | 高碳高合金钢耐磨球及其制造方法 |
| CN103741051B (zh) * | 2014-01-24 | 2015-05-13 | 浙江郑氏刀剑有限公司 | 宝剑剑身制作方法 |
| CN104060191B (zh) * | 2014-06-27 | 2016-04-13 | 南京赛达机械制造有限公司 | 一种可提高冲击韧度的汽轮机叶片及其生产工艺 |
| CN105112788A (zh) * | 2015-08-10 | 2015-12-02 | 霍邱县忠振耐磨材料有限公司 | 一种球磨机用中碳中铬合金钢球及其制备方法 |
| CN105349903A (zh) * | 2015-10-28 | 2016-02-24 | 安徽省三方新材料科技有限公司 | 一种高铬高碳钢耐磨斗齿齿座 |
| US20240183014A1 (en) | 2022-12-03 | 2024-06-06 | Arthur Craig Reardon | High Speed Steel Composition |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1775615A (en) * | 1930-06-12 | 1930-09-09 | Heppenstall Co | Alloy steel |
| US3295966A (en) * | 1964-04-30 | 1967-01-03 | Crucible Steel Co America | Versatile low-alloy tool steel |
| JPS5214513A (en) * | 1975-07-25 | 1977-02-03 | Hitachi Metals Ltd | Alloy steel for tools |
| JPS57143468A (en) * | 1981-02-28 | 1982-09-04 | Daido Steel Co Ltd | High-speed tool steel |
| SU996506A1 (ru) * | 1981-07-15 | 1983-02-15 | Институт проблем литья АН УССР | Сталь |
| JPS62208457A (ja) * | 1986-03-10 | 1987-09-12 | Toshiba Corp | 可撓性磁気シ−ト記録再生装置 |
| JPS6411945A (en) * | 1987-07-03 | 1989-01-17 | Daido Steel Co Ltd | Cold tool steel |
| JPH0364429A (ja) * | 1989-07-31 | 1991-03-19 | Daido Steel Co Ltd | 被削性に優れた工具鋼 |
| SU1678082A1 (ru) * | 1990-02-26 | 1994-10-30 | Производственное объединение "Ижорский завод" | Штамповая сталь |
| EP0458646B1 (en) * | 1990-05-23 | 1997-09-10 | Aichi Steel Works, Ltd. | Bearing steel |
| FR2666351B1 (fr) * | 1990-08-29 | 1993-11-12 | Creusot Loire Industrie | Procede d'elaboration d'un acier a outils destine notamment a la fabrication de moules et acier obtenu par ce procede. |
| JPH05156407A (ja) * | 1991-12-06 | 1993-06-22 | Hitachi Metals Ltd | 高性能転造ダイス用鋼およびその製造方法 |
| FR2727431B1 (fr) * | 1994-11-30 | 1996-12-27 | Creusot Loire | Procede d'elaboration d'un acier au titane et acier obtenu |
| US5830287A (en) * | 1997-04-09 | 1998-11-03 | Crucible Materials Corporation | Wear resistant, powder metallurgy cold work tool steel articles having high impact toughness and a method for producing the same |
| SE511747C2 (sv) * | 1998-03-27 | 1999-11-15 | Uddeholm Tooling Ab | Kallarbetsstål |
| JP4352491B2 (ja) * | 1998-12-25 | 2009-10-28 | 大同特殊鋼株式会社 | 快削性冷間工具鋼 |
-
2001
- 2001-04-18 FR FR0105225A patent/FR2823768B1/fr not_active Expired - Lifetime
-
2002
- 2002-04-08 MY MYPI20021261A patent/MY127296A/en unknown
- 2002-04-09 TW TW091107066A patent/TW554050B/zh not_active IP Right Cessation
- 2002-04-16 AT AT02727658T patent/ATE282721T1/de active
- 2002-04-16 UA UA20031110383A patent/UA74258C2/uk unknown
- 2002-04-16 PL PL363285A patent/PL197554B1/pl unknown
- 2002-04-16 US US10/474,841 patent/US7445750B1/en not_active Expired - Lifetime
- 2002-04-16 MX MXPA03009445A patent/MXPA03009445A/es active IP Right Grant
- 2002-04-16 DE DE60201984T patent/DE60201984T2/de not_active Expired - Lifetime
- 2002-04-16 KR KR1020037013556A patent/KR100846815B1/ko not_active Expired - Lifetime
- 2002-04-16 SK SK1299-2003A patent/SK286725B6/sk not_active IP Right Cessation
- 2002-04-16 HU HU0303947A patent/HU228835B1/hu unknown
- 2002-04-16 PT PT02727658T patent/PT1379706E/pt unknown
- 2002-04-16 BR BRPI0209018-0A patent/BR0209018B1/pt not_active IP Right Cessation
- 2002-04-16 RU RU2003133465/02A patent/RU2279494C2/ru active
- 2002-04-16 CN CNB028084276A patent/CN1226441C/zh not_active Expired - Lifetime
- 2002-04-16 CA CA002444175A patent/CA2444175C/fr not_active Expired - Lifetime
- 2002-04-16 EP EP02727658A patent/EP1379706B1/fr not_active Expired - Lifetime
- 2002-04-16 JP JP2002581704A patent/JP4523230B2/ja not_active Expired - Lifetime
- 2002-04-16 CZ CZ20032755A patent/CZ297762B6/cs not_active IP Right Cessation
- 2002-04-16 ES ES02727658T patent/ES2231691T3/es not_active Expired - Lifetime
- 2002-04-16 WO PCT/FR2002/001302 patent/WO2002083966A1/fr active IP Right Grant
- 2002-04-16 AU AU2002257862A patent/AU2002257862B2/en not_active Expired
- 2002-04-17 AR ARP020101391A patent/AR033220A1/es unknown
-
2003
- 2003-10-09 ZA ZA200307900A patent/ZA200307900B/en unknown
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