EP1449929B1 - Metastabile beta-titanlegierung - Google Patents
Metastabile beta-titanlegierung Download PDFInfo
- Publication number
- EP1449929B1 EP1449929B1 EP02783880A EP02783880A EP1449929B1 EP 1449929 B1 EP1449929 B1 EP 1449929B1 EP 02783880 A EP02783880 A EP 02783880A EP 02783880 A EP02783880 A EP 02783880A EP 1449929 B1 EP1449929 B1 EP 1449929B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- titanium alloy
- ductility
- balance
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Definitions
- This invention relates to the non-ferrous metallurgy, and more particularly to the development of new titanium-base alloys combining high strength and ductility properties using relatively low-cost alloying elements.
- the alloys of this invention can be applied in a wide range of products especially fasteners and different coil springs.
- One of the known titanium alloys is the alloy containing (mass %): 2-6 Al; 6-9 Mo; 1-3 V; 0.5-2 Cr; 0-1.5 Fe; Ti balance.
- Ref USSR Inventor's Certificate No. 180351, Class C22C 14/00, 1966.
- this alloy has insufficient ductility due to the high content of Al and the presence of Cr. Besides this alloy is rather expensive.
- the other known titanium alloy contains (mass %): 4-6.3 Al; 4.5-5.9 V; 4.5-5.9 Mo; 2.0-3.6 Cr; 0.2-0.5 Fe; Ti balance.
- Ref RF Patent No. 2169204, Class C22C 14/00, published 2001.
- the said alloy as-heat treated has high strength properties in heavy section forgings, but its ductility is insufficient and so the alloy cannot be used for production of such parts as coil springs.
- the alloy most close to the claimed invention is the metastable ⁇ -titanium alloy containing (mass %): 4-5 Fe; 4-7 Mo; 1-2 Al; O 2 up to 0.25; Ti balance.
- Ref US Patent No. 5,294,267, Class C22C 14/00, published 1994. This alloy will be the prototype.
- US patent No. 3,615,378 discloses a high-strength metastable beta-titanium alloy with good ductility, which contains one of Fe, Mn, Cr and Co as the beta-eutecnoid elements and a V-content of 4-9 atomic %.
- This alloy has high machinability, demands relatively low costs and is widely used for production of coil cylindrical springs in automotive industry.
- said alloy has low especially elongation, which reduces the application of this alloy and is of importance during manufacture of some types of coil springs and fastener components.
- the object of this invention is to provide a titanium alloy with combination of high ductility and strength properties in a heat treated condition, which can be produced using low cost alloying elements.
- this alloy has higher content of aluminum than the prototype.
- the content of aluminum of less than 3.5% does not significantly influence on the alloy ductility.
- the contents of aluminum greater than 3.5% and iron greater than 3.8% increases the ⁇ -phase quantity, causes hardening and reduces ductility lower than desired.
- the lower content of iron ( ⁇ 4%) than in the prototype ensures greater phase stability during thermal cycles (deformation and heat treatment).
- the desired strength properties cannot be achieved with aluminum below 1.5%.
- the content of molybdenum below 4.5% and iron below 1.5% reduces ⁇ -phase quantity and does not allow to achieve high strength of the as-heat treated alloy.
- Molybdenum is added as ferromolybdenum with 55-75% of molybdenum and iron balance.
- Vanadium is added as ferrovanadium with 65-85 % of vanadium and iron balance or Ti-Al-V system scrap.
- ingots with the composition shown in Table 1 were melted in a vacuum arc furnace and 20 mm diameter bars were made from these ingots.
- the bars were heat treated under the following conditions: heating to temperature of 30 °C below beta transus temperature, water cooling, heating to 480 °C for 8 hours, air cooling. Then tensile specimens were tested according to ASTM E 8. Mechanical properties of the produced bars from the evaluated alloys are shown in Table 2.
- the claimed metastable ⁇ -titanium alloy as compared to the known alloys has the specified optimal combination of beta and alpha stabilizing alloying elements, which ensure high strength and ductility of the as-heat treated alloy. It is low cost and can be used for production of a wide range of critical parts, especially fastener components and different coil springs.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Springs (AREA)
- Heat Treatment Of Articles (AREA)
- Ceramic Products (AREA)
- Forging (AREA)
Claims (1)
- Metastabile beta-Titanlegierung, enthaltend Aluminium, Molybdän und Eisen, dadurch gekennzeichnet, dass diese Legierung zusätzlich Vanadium enthält, jeweils mit dem folgenden Gehalt der Komponenten (Masse-%):
Aluminium 1.5 - 3.5 Molybdän 4.5 - 8.0 Vanadium 1.0 - 3.5 Eisen 1.5 - 3.8 Titan Ausgleich
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2001131383/02A RU2211873C2 (ru) | 2001-11-22 | 2001-11-22 | МЕТАСТАБИЛЬНЫЙ β-ТИТАНОВЫЙ СПЛАВ |
RU2001131383 | 2001-11-22 | ||
PCT/RU2002/000502 WO2003044234A1 (fr) | 2001-11-22 | 2002-11-18 | Alliage metastable de $g(b)-titane |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1449929A1 EP1449929A1 (de) | 2004-08-25 |
EP1449929A4 EP1449929A4 (de) | 2005-02-02 |
EP1449929B1 true EP1449929B1 (de) | 2006-05-17 |
Family
ID=20254397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02783880A Expired - Lifetime EP1449929B1 (de) | 2001-11-22 | 2002-11-18 | Metastabile beta-titanlegierung |
Country Status (9)
Country | Link |
---|---|
US (2) | US20060039819A1 (de) |
EP (1) | EP1449929B1 (de) |
AT (1) | ATE326554T1 (de) |
DE (1) | DE60211548T2 (de) |
DK (1) | DK1449929T3 (de) |
ES (1) | ES2261754T3 (de) |
HK (1) | HK1066832A1 (de) |
RU (1) | RU2211873C2 (de) |
WO (1) | WO2003044234A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005052918A1 (de) * | 2005-11-03 | 2007-05-16 | Hempel Robert P | Kaltverformbare Ti-Legierung |
RU2425164C1 (ru) | 2010-01-20 | 2011-07-27 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Вторичный титановый сплав и способ его изготовления |
CN102586639A (zh) * | 2012-03-16 | 2012-07-18 | 广州有色金属研究院 | 一种高速压制成形制备钛合金的方法 |
GB201701251D0 (en) * | 2017-01-25 | 2017-03-08 | Univ Oxford Innovation Ltd | A titanium-based alloy |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU180351A1 (ru) * | 1965-01-06 | 1966-03-21 | Сплав на основе титана | |
US3615378A (en) * | 1968-10-02 | 1971-10-26 | Reactive Metals Inc | Metastable beta titanium-base alloy |
GB1333729A (en) * | 1970-10-23 | 1973-10-17 | Lockheed Aircraft Corp | Titanium base alloy |
DE3425055C1 (de) * | 1984-07-07 | 1985-07-25 | Daimler-Benz Ag, 7000 Stuttgart | Getterstoff |
JP2737498B2 (ja) * | 1991-12-24 | 1998-04-08 | 日本鋼管株式会社 | 高密度粉末焼結用チタン合金 |
JP2803455B2 (ja) * | 1992-04-15 | 1998-09-24 | 日本鋼管株式会社 | 高密度粉末焼結チタン合金の製造方法 |
US5294267A (en) * | 1992-12-04 | 1994-03-15 | Titanium Metals Corporation | Metastable beta titanium-base alloy |
US5980655A (en) * | 1997-04-10 | 1999-11-09 | Oremet-Wah Chang | Titanium-aluminum-vanadium alloys and products made therefrom |
US5855697A (en) * | 1997-05-21 | 1999-01-05 | Imra America, Inc. | Magnesium alloy having superior elevated-temperature properties and die castability |
RU2169204C1 (ru) * | 2000-07-19 | 2001-06-20 | ОАО Верхнесалдинское металлургическое производственное объединение | Сплав на основе титана и способ термической обработки крупногабаритных полуфабрикатов из этого сплава |
RU2269584C1 (ru) * | 2004-07-30 | 2006-02-10 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Сплав на основе титана |
US20060045789A1 (en) * | 2004-09-02 | 2006-03-02 | Coastcast Corporation | High strength low cost titanium and method for making same |
-
2001
- 2001-11-22 RU RU2001131383/02A patent/RU2211873C2/ru active
-
2002
- 2002-11-18 ES ES02783880T patent/ES2261754T3/es not_active Expired - Lifetime
- 2002-11-18 WO PCT/RU2002/000502 patent/WO2003044234A1/ru active IP Right Grant
- 2002-11-18 EP EP02783880A patent/EP1449929B1/de not_active Expired - Lifetime
- 2002-11-18 DK DK02783880T patent/DK1449929T3/da active
- 2002-11-18 US US10/496,493 patent/US20060039819A1/en not_active Abandoned
- 2002-11-18 AT AT02783880T patent/ATE326554T1/de not_active IP Right Cessation
- 2002-11-18 DE DE60211548T patent/DE60211548T2/de not_active Expired - Lifetime
-
2004
- 2004-12-06 HK HK04109637A patent/HK1066832A1/xx not_active IP Right Cessation
-
2008
- 2008-02-11 US US12/069,496 patent/US20080199350A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
ATE326554T1 (de) | 2006-06-15 |
EP1449929A4 (de) | 2005-02-02 |
HK1066832A1 (en) | 2005-04-01 |
EP1449929A1 (de) | 2004-08-25 |
DK1449929T3 (da) | 2006-06-12 |
US20080199350A1 (en) | 2008-08-21 |
RU2211873C2 (ru) | 2003-09-10 |
WO2003044234A1 (fr) | 2003-05-30 |
ES2261754T3 (es) | 2006-11-16 |
US20060039819A1 (en) | 2006-02-23 |
DE60211548T2 (de) | 2006-09-14 |
DE60211548D1 (de) | 2006-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1882752B1 (de) | Legierung auf titanbasis | |
EP2435591B1 (de) | Near-beta hochfeste titanlegierung für hoch-beanspruchte anwendungen und verfahren zur deren herstellung | |
EP1302554B1 (de) | Titanlegierung und wärmebehandlungsverfahren für grossdimensionale, halbfertige materialien aus dieser legierung | |
EP1302555B1 (de) | Titanlegierung und wärmebehandlungsverfahren für grossdimensionale, halbfertige materialien aus dieser legierung | |
CN114921684B (zh) | 高强度钛合金 | |
EP1632581A1 (de) | Hochfestes, preiswertes Titan und Verfahren zu dessen Herstellung | |
EP3844314B1 (de) | Kriechfeste titanlegierungen | |
RU2150528C1 (ru) | Сплав на основе титана | |
EP3775307B1 (de) | Hochtemperaturtitanlegierung | |
JP3873313B2 (ja) | 高強度チタン合金の製造方法 | |
EP0600579B1 (de) | Metastabile beta-Legierung auf Titanbasis | |
WO2020091915A2 (en) | Titanium alloy with moderate strength and high ductility | |
US20080199350A1 (en) | Metastable beta-titanium alloy | |
JPH05279773A (ja) | 均一微細組織の高強度チタン合金 | |
JPH0770676A (ja) | α+β型チタン合金 | |
JPS61250138A (ja) | 冷間塑性加工性に優れたチタン合金 | |
RU2122040C1 (ru) | Сплав на основе титана | |
EP1577409B1 (de) | Legierung auf titanbasis | |
KR20170122083A (ko) | 석출강화형 고강도 고연성 타이타늄 합금 및 그 제조 방법 | |
JPH0196344A (ja) | チタニウム−アルミニウム合金 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20040513 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20041221 |
|
REG | Reference to a national code |
Ref country code: HK Ref legal event code: DE Ref document number: 1066832 Country of ref document: HK |
|
17Q | First examination report despatched |
Effective date: 20050314 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VSMPO-AVISMA CORPORATION |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20060517 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP Ref country code: CH Ref legal event code: NV Representative=s name: BRAUNPAT BRAUN EDER AG |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 60211548 Country of ref document: DE Date of ref document: 20060622 Kind code of ref document: P |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
REG | Reference to a national code |
Ref country code: HK Ref legal event code: GR Ref document number: 1066832 Country of ref document: HK |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20061017 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2261754 Country of ref document: ES Kind code of ref document: T3 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061120 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061130 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20070220 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060818 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060817 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20060517 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20081128 Year of fee payment: 7 Ref country code: DK Payment date: 20081119 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20081117 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20081105 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20081031 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20091126 Year of fee payment: 8 |
|
EUG | Se: european patent has lapsed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20091118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091118 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20110329 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091119 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110316 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091119 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20101118 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 16 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20191128 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20191126 Year of fee payment: 18 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 60211548 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20201130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20210601 |