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(12) Patent: | (11) CA 2514736 |
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(54) English Title: | PROCEDE DE FABRICATION D'UNE BANDE D'ACIER DUAL-PHASE A STRUCTURE FERRITO-MARTENSITIQUE, LAMINEE A FROID ET BANDE OBTENUE |
(54) French Title: | METHOD OF PRODUCING A COLD-ROLLED BAND OF DUAL-PHASE STEEL WITH A FERRITIC/MARTENSITIC STRUCTURE AND BAND THUS OBTAINED |
Status: | Term Expired - Post Grant Beyond Limit |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | NORTON ROSE FULBRIGHT CANADA LLP/S.E.N.C.R.L., S.R.L. |
(74) Associate agent: | |
(45) Issued: | 2012-12-04 |
(86) PCT Filing Date: | 2004-01-30 |
(87) Open to Public Inspection: | 2004-09-16 |
Examination requested: | 2007-12-07 |
Availability of licence: | N/A |
Dedicated to the Public: | N/A |
(25) Language of filing: | French |
Patent Cooperation Treaty (PCT): | Yes |
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(86) PCT Filing Number: | PCT/FR2004/000209 |
(87) International Publication Number: | FR2004000209 |
(85) National Entry: | 2005-07-28 |
(30) Application Priority Data: | ||||||
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The invention relates to a method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure. The inventive method consists in hot rolling a slab having a chemical composition which comprises, by weight, 0.01 % </= C </= 0.1 %, 0.05 % </= Mn </= 1 %, 0.01 % </= Cr </= 1 %, 0.01 % </= Si </= 0.5 %, 0.001 % </= P </= 0.2 %, 0.01 % </= Al </= 0.1 %, N </= 0.01 %, the remainder being iron and impurities resulting from the preparation thereof. The method also comprises the following subsequent steps consisting in: hot winding the band obtained at a temperature of between 550 and 850 DEG C; cold rolling the band with a reduction ratio of between 60 and 90 %; annealing the band continuously in the intercritical region; cooling said band to ambient temperature, in one or more steps, the rate of cooling between 600 DEG C and ambient temperature being between 100 DEG C/s and 1500 DEG C/s; and, optionally, tempering same at a temperature of less than 300 DEG C. The aforementioned annealing and cooling operations are performed such that the end band comprises between 1 and 15 % martensite. The invention also relates to the steel band thus formed.
L'invention concerne un procédé de fabrication d'une bande d'acier dualphase à
structure ferrito-martensitique,
laminée à froid dans lequel on lamine à chaud une brame dont la composition
chimique comprend, en poids 0,010% .ltoreq. C .ltoreq. 0,100%
0,050% .ltoreq. Mn .ltoreq. 1,0% 0,010% .ltoreq. Cr .ltoreq. 1,0% 0,010%
.ltoreq. Si .ltoreq. 0,50% 0,001% .ltoreq. P .ltoreq. 0,20% 0,010% .ltoreq. AI
.ltoreq. 0,10% N .ltoreq. 0,010% le reste
étant du fer et des impuretés résultant de l'élaboration, ledit procédé
comprenant ensuite les étapes consistant à - bobiner la bande à
chaud obtenue à une température comprise entre 550 et 850°C, puis - à
laminer à froid la bande avec un taux de réduction compris
entre 60 et 90%, puis - à recuire la bande de façon continue dans le domaine
intercritique, et - à la refroidir jusqu'à la température
ambiante, en une ou plusieurs étapes, la vitesse de refroidissement entre
600°C et la température ambiante étant comprise entre
100°C/s et 1500°C/s, - et éventuellement à lui faire subir un
revenu à une température inférieure à 300°C, les opérations de recuit
et
de refroidissement étant menées de telle sorte que la bande comprenne
finalement de 1 à 15% de martensite, et la bande d'acier ainsi
formée.
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
Sorry, the representative drawing for patent document number 2514736 was not found.
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Description | Date |
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Inactive: Expired (new Act pat) | 2024-01-30 |
Common Representative Appointed | 2019-10-30 |
Common Representative Appointed | 2019-10-30 |
Grant by Issuance | 2012-12-04 |
Inactive: Cover page published | 2012-12-03 |
Inactive: Final fee received | 2012-09-12 |
Pre-grant | 2012-09-12 |
Notice of Allowance is Issued | 2012-07-30 |
Letter Sent | 2012-07-30 |
4 | 2012-07-30 |
Notice of Allowance is Issued | 2012-07-30 |
Inactive: Approved for allowance (AFA) | 2012-07-26 |
Amendment Received - Voluntary Amendment | 2012-05-04 |
Inactive: S.30(2) Rules - Examiner requisition | 2011-11-10 |
Amendment Received - Voluntary Amendment | 2011-09-07 |
Inactive: S.30(2) Rules - Examiner requisition | 2011-03-07 |
Amendment Received - Voluntary Amendment | 2011-01-28 |
Inactive: S.30(2) Rules - Examiner requisition | 2010-08-02 |
Amendment Received - Voluntary Amendment | 2010-05-27 |
Inactive: S.30(2) Rules - Examiner requisition | 2009-12-02 |
Amendment Received - Voluntary Amendment | 2008-04-04 |
Letter Sent | 2008-02-22 |
Request for Examination Received | 2007-12-07 |
Request for Examination Requirements Determined Compliant | 2007-12-07 |
All Requirements for Examination Determined Compliant | 2007-12-07 |
Inactive: IPRP received | 2007-03-28 |
Letter Sent | 2006-01-17 |
Inactive: Single transfer | 2005-12-12 |
Inactive: Cover page published | 2005-10-25 |
Inactive: Courtesy letter - Evidence | 2005-10-25 |
Inactive: Notice - National entry - No RFE | 2005-10-20 |
Application Received - PCT | 2005-09-20 |
National Entry Requirements Determined Compliant | 2005-07-28 |
Application Published (Open to Public Inspection) | 2004-09-16 |
There is no abandonment history.
The last payment was received on 2012-01-05
Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following
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Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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USINOR |
Past Owners on Record |
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ANTOINE MOULIN |