公开(公告)号：US20220017985A1

公开(公告)日：2022-01-20

申请号：US17311808

申请日：2019-12-17

Applicant: ArcelorMittal

Inventor： Patrice ALEXANDRE ,  Magali BOUZAT ,  Anirban CHAKRABORTY ,  Hassan GHASSEMI-ARMAKI ,  Olga GIRINA ,  Ronan JACOLOT ,  Alexey KOLTSOV ,  Aude NADLER ,  Damon PANAHI ,  Michel SOLER

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18

Abstract: A cold rolled and heat-treated steel sheet having a composition including, by weight percent: C 0.3-0.4%, Mn 2.0-2.6%, Si: 0.8-1.6%, Al 0.01-0.6%, Mo 0.15-0.5%, Cr 0.3-1.0%, Nb≤0.06%, Ti≤0.06%, Ni≤0.8%, S≤0.010%, P≤0.020% and N≤0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%, between 70% and 85% of tempered martensite, at most 5% of fresh martensite and at most 5% of bainite. It also deals with a manufacturing method thereof.

公开(公告)号：US20200156129A1

公开(公告)日：2020-05-21

申请号：US16626173

申请日：2017-06-26

Applicant: ArcelorMittal

Inventor： Ronan JACOLOT ,  Didier HUIN ,  Christian MORETTO ,  Daniele CORSELLO

IPC: B21B37/76 ,  C21D11/00 ,  B21B45/02 ,  C21D8/02

Abstract: A method for determining the temperature of a metal strip (1) inside a cooling apparatus (4) of a hot rolling installation is implemented by an electronic device (12). This method includes acquiring a temperature measure of a strip portion at a current time instant; estimating, at the current time instant, a heat flux extracted from the strip portion inside the cooling apparatus according to a thermal model, and computing a strip portion temperature at a next time instant from the acquired temperature measure and the estimated extracted heat flux. The thermal model models an air cooling of the strip portion, a coolant header cooling of the strip portion by a coolant header and a remaining coolant cooling of the strip portion, wherein for the coolant header cooling the model models both an impingement cooling of the strip portion and a parallel flow cooling of the strip portion.

公开(公告)号：US20240157421A1

公开(公告)日：2024-05-16

申请号：US18420054

申请日：2024-01-23

Applicant: ArcelorMittal

Inventor： Ronan JACOLOT ,  Didier HUIN ,  Christian MORETTO ,  Daniele CORSELLO

IPC: B21B37/76 ,  B21B45/02 ,  C21D1/84 ,  C21D8/02 ,  C21D9/46 ,  C21D11/00 ,  G01K13/04 ,  G01K17/08

CPC classification number: B21B37/76 ,  B21B45/0218 ,  C21D1/84 ,  C21D8/0263 ,  C21D9/46 ,  C21D11/005 ,  G01K13/04 ,  G01K17/08

Abstract: A method for determining the temperature of a metal strip (1) inside a cooling apparatus (4) of a hot rolling installation is implemented by an electronic device (12). This method includes acquiring a temperature measure of a strip portion at a current time instant; estimating, at the current time instant, a heat flux extracted from the strip portion inside the cooling apparatus according to a thermal model, and computing a strip portion temperature at a next time instant from the acquired temperature measure and the estimated extracted heat flux. The thermal model models an air cooling of the strip portion, a coolant header cooling of the strip portion by a coolant header and a remaining coolant cooling of the strip portion, wherein for the coolant header cooling the model models both an impingement cooling of the strip portion and a parallel flow cooling of the strip portion.

公开(公告)号：US20230167557A1

公开(公告)日：2023-06-01

申请号：US18095520

申请日：2023-01-10

Applicant: ArcelorMittal

Inventor： Thomas HENRION ,  Ronan JACOLOT ,  Martin BEAUVAIS

IPC: C23C28/02 ,  C22C33/04 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D7/13 ,  B32B15/01

CPC classification number: C23C28/025 ,  C22C33/04 ,  C22C38/58 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/002 ,  C22C38/001 ,  C21D7/13 ,  B32B15/016

Abstract: A method for manufacturing a hot-rolled and coated steel sheet having a thickness between 1.8 mm and 5 mm. The method contains the steps of: providing a semi-product having a composition containing: 0.04%≤C≤0.38%, 0.40%≤Mn≤3%, 0.005%≤Si≤0.70%, 0.005%≤Al≤0.1%, 0.001%≤Cr≤2%, 0.001%≤Ni≤2%, 0.001%≤Ti≤0.2%, Nb≤0.1%, B≤0.010%, 0.0005%≤N≤0.010%, 0.0001%≤S≤0.05%, 0.0001%≤P≤0.1%, Mo≤0.65%, W≤0.30%, Ca≤0.006%, hot-rolling with a final rolling temperature FRT, to obtain a hot-rolled steel product having a thickness between 1.8 mm and 5 mm, then cooling down to a coiling temperature Tcoil satisfying: 450° C.≤Tcoil≤Tcoilmax with Tcoilmax=650−140×fγ, Tcoilmax being expressed in degrees Celsius and fγ designating the austenite fraction just before the coiling, and coiling to obtain a hot-rolled steel substrate, pickling and coating the hot-rolled steel substrate with Al or an Al alloy by continuous hot-dipping in a bath, to obtain a hot-rolled and coated steel sheet containing a hot-rolled steel sheet and an Al or an Al alloy coating, having a thickness between 10 and 33 μm, on each side of the hot-rolled steel sheet.

公开(公告)号：US20200224297A1

公开(公告)日：2020-07-16

申请号：US16349864

申请日：2017-11-23

Applicant: ArcelorMittal

Inventor： Thomas HENRION ,  Ronan JACOLOT ,  Martin BEAUVAIS

IPC: C22C38/50 ,  C22C38/48 ,  C22C38/02 ,  C22C38/04 ,  C21D8/02 ,  C23C2/12 ,  B21D22/02 ,  C23C2/40

Abstract: A method for manufacturing a hot-rolled and coated steel sheet having a thickness between 1.8 mm and 5 mm. The method contains the steps of: providing a semi-product having a composition containing: 0.04%≤C≤0.38%, 0.40%≤Mn≤3%, 0.005%≤Si≤0.70%, 0.005%≤Al≤0.1%, 0.001%≤Cr≤2%, 0.001%≤Ni≤2%, 0.001%≤Ti≤0.2%, Nb≤0.1%, B≤0.010%, 0.0005%≤N≤0.010%, 0.0001%≤S≤0.05%, 0.0001%≤P≤0.1%, Mo≤0.65%, W≤0.30%, Ca≤0.006%, hot-rolling with a final rolling temperature FRT, to obtain a hot-rolled steel product having a thickness between 1.8 mm and 5 mm, then cooling down to a coiling temperature Tcoil satisfying: 450° C.≤Tcoil≤Tcoilmax with Tcoilmax=650−140×fγ, Tcoilmax being expressed in degrees Celsius and fγ designating the austenite fraction just before the coiling, and coiling to obtain a hot-rolled steel substrate, pickling and coating the hot-rolled steel substrate with Al or an Al alloy by continuous hot-dipping in a bath, to obtain a hot-rolled and coated steel sheet containing a hot-rolled steel sheet and an Al or an Al alloy coating, having a thickness between 10 and 33 μm, on each side of the hot-rolled steel sheet.