NDLI: Method for Manufacturing A High Strength Steel Sheet Having Improved Formability and Ductility and Sheet Obtained

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Method for Manufacturing A High Strength Steel Sheet Having Improved Formability and Ductility and Sheet Obtained

Content Provider	The Lens
Abstract	A method for manufacturing a high-strength sheet having improved formability and ductility accord which the chemical composition of the steel contains, in percent by weight: 0.25%
Related Links	https://www.lens.org/lens/patent/011-397-412-571-107/frontpage
Language	English
Publisher Date	2019-11-12
Access Restriction	Open
Content Type	Text
Resource Type	Patent
Jurisdiction	United States of America
Date Applied	2015-07-03
Agent	Davidson, Davidson & Kappel, Llc
Applicant	Arcelormittal
Application No.	201515323091
Claim	A method for manufacturing a steel sheet comprising the steps of: providing a steel sheet having a chemical composition including, in percent by weight: 0.25%The method according to claim 1 , further comprising, after the hot-rolling step and before the batch annealing step, a step of coiling the hot rolled steel sheet. The method according to claim 2 , wherein the hot rolled steel sheet is coiled at a coiling temperature between 350° C. and 580° C. The method according to claim 1 , wherein the batch annealing is performed at a temperature between 525° C. and 700° C. The method according to claim 1 , wherein the batch annealing is performed for a time between 4 hours and 10 hours. The method according to claim 1 , wherein the cold rolled steel sheet is cooled to the quenching temperature QT in order to obtain a final structure including at least 75% of martensite. The method according to claim 1 , wherein the cold rolled steel sheet is cooled to the quenching temperature QT in order to obtain a final structure including at least 20% of residual austenite. The method according to claim 1 , wherein the chemical composition of the steel includes 2.3%≤Si≤2.5%. The method according to claim 1 , wherein the chemical composition of the steel includes: 0.25%The method according to claim 1 , wherein the annealing temperature AT is greater than 860° C. and less than 950° C., the quenching temperature QT is between 200° C. and 260° C., and the overaging temperature PT is between 370° C. and 430° C. A method for manufacturing a steel sheet comprising the steps of: providing a steel sheet having a chemical composition including, in percent by weight: 0.25%The method according to claim 11 , further comprising, after the hot-rolling step and before the batch annealing step, a step of coiling the hot rolled steel sheet. The method according to claim 12 , wherein the hot rolled steel sheet is coiled at a coiling temperature between 350° C. and 580° C. The method according to claim 11 , wherein the batch annealing is performed at a temperature between 525° C. and 700° C. The method according to claim 11 , wherein the batch annealing is performed for a time between 4 hours and 10 hours. The method according to claim 11 , wherein the cold rolled steel sheet is cooled to the quenching temperature QT in order to obtain a final structure including at least 75% of martensite. The method according to claim 11 , wherein the cold rolled steel sheet is cooled to the quenching temperature QT in order to obtain a final structure including at least 20% of residual austenite. The method according to claim 11 , wherein the chemical composition of the steel includes 2.3%≤Si≤2.5%. The method according to claim 11 , wherein the chemical composition of the steel includes: 0.25%The method according to claim 11 , wherein the annealing temperature AT is greater than 860° C. and less than 950° C., the quenching temperature QT is between 200° C. and 260° C., the overaging temperature PT is between 370° C. and 430° C. A steel sheet comprising: a chemical composition including in percent by weight: 0.25%The steel sheet according to claim 21 , wherein the structure includes at least 75% of martensite. The steel sheet according to claim 21 , wherein the structure contains at least 20% of residual austenite. The steel sheet according to claim 21 , wherein the chemical composition of the steel includes 2.3%≤Si≤2.5%. The steel sheet according to claim 21 , wherein the chemical composition of the steel includes: 0.25%The steel sheet according to claim 21 , wherein at least one face of the steel sheet is coated.
CPC Classification	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 ALLOYS LAYERED PRODUCTS; i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT; e.g. CELLULAR OR HONEYCOMB; FORM COATING METALLIC MATERIAL;COATING MATERIAL WITH METALLIC MATERIAL;SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE; BY CHEMICAL CONVERSION OR SUBSTITUTION;COATING BY VACUUM EVAPORATION; BY SPUTTERING; BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION; IN GENERAL
Examiner	Colin W. Slifka
Extended Family	111-304-504-275-962 099-934-335-573-670 040-836-844-824-546 178-485-383-266-07X 108-297-172-921-751 160-416-145-309-529 191-361-932-417-042 040-952-391-017-60X 006-510-810-967-036 116-427-917-701-933 139-378-318-884-746 061-966-722-071-045 005-130-284-068-717 011-397-412-571-107 145-288-356-312-990 027-370-664-496-853 073-117-316-211-961 025-083-421-249-255 166-553-222-556-398 157-871-789-139-015 014-645-027-414-649 090-102-667-591-091 022-721-676-009-784 060-540-127-459-446 080-572-699-154-949 033-191-198-405-312 101-644-102-541-162 124-235-569-061-354 074-399-120-797-31X
Patent ID	10472692
Inventor/Author	Föjer Gunhild Soler Michel Hell Jean-christophe
IPC	C21D1/18 C21D6/00 C21D8/02 C21D9/46 C22C38/02 C22C38/04
Status	Active
Owner	Arcelormittal
Simple Family	111-304-504-275-962 099-934-335-573-670 040-836-844-824-546 178-485-383-266-07X 108-297-172-921-751 160-416-145-309-529 191-361-932-417-042 040-952-391-017-60X 006-510-810-967-036 116-427-917-701-933 139-378-318-884-746 061-966-722-071-045 005-130-284-068-717 011-397-412-571-107 145-288-356-312-990 027-370-664-496-853 073-117-316-211-961 025-083-421-249-255 166-553-222-556-398 157-871-789-139-015 014-645-027-414-649 090-102-667-591-091 022-721-676-009-784 060-540-127-459-446 080-572-699-154-949 033-191-198-405-312 101-644-102-541-162 124-235-569-061-354 074-399-120-797-31X
CPC (with Group)	C21D6/005 C21D6/008 C21D8/0247 C22C38/02 C22C38/04 C22C38/06 C21D2211/008 C21D2211/001 C21D2211/002 C21D2211/005 C21D8/0226 C21D8/0236 C21D8/0263 C21D9/46 C21D1/18 B32B15/013 C23C2/06 C23C2/40 C21D6/00 C21D8/0205 C21D6/04 C21D8/02 C23C2/02
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent/New European patent specification (amended specification after opposition procedure)

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