公开(公告)号：US20240035109A1

公开(公告)日：2024-02-01

申请号：US18377943

申请日：2023-10-09

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/02 ,  C21D1/673 ,  C21D8/02 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/21 ,  B21B1/22 ,  C21D6/00 ,  C22C38/22 ,  C23C2/12

CPC classification number: C21D9/46 ,  B32B15/012 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/022 ,  C21D1/673 ,  C21D8/0278 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/21 ,  B21B1/22 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/002 ,  C22C38/22 ,  C23C2/12 ,  B21B2001/225 ,  B32B2605/00 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A process for manufacturing a press hardened laser welded steel part, includes providing at least one first steel sheet with a composition containing, by weight 0.062≤C≤0.095%, the at least one first steel sheet precoated with a metallic precoating of aluminum, or aluminum-based alloy, or aluminum alloy.



providing at least one second steel sheet with a composition containing, by weight, from to 0.38% of carbon, the at least one second steel sheet precoated with a metallic precoating of aluminum, or aluminum-based alloy, or aluminum alloy;
removing a portion of a thickness of the aluminum precoating at upper and lower sides along one side of a periphery of the at least one first steel sheet and the at least one second steel sheet;
creating a welded blank by laser welding the at least one first steel sheet and the at least one second steel sheet, such that an aluminum content in a weld metal is lower than 0.3% by weight, the laser welding being performed along the periphery wherein the portion of the thickness of the aluminum precoating has been removed;
heating the welded blank and holding the welded blank at a temperature Tm between 890 and 950° C., a holding duration Dm at the temperature being between 1 and 10 minutes, so as to obtain a heated welded blank;
transferring the heated welded blank within a forming press, the transfer duration Dt being less than 10 s;
hot forming the heated welded blank in the forming press so as to obtain a welded formed part; and
cooling the welded formed part at a first cooling rate CR1 between 40 and 360° C./s in a temperature range between 750 and 450° C., and at a second cooling rate CR2 between 15 to 150° C./s in a temperature range between 450° C. and 250° C., wherein CR2

公开(公告)号：US20220017987A1

公开(公告)日：2022-01-20

申请号：US17491785

申请日：2021-10-01

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/02 ,  C21D1/673 ,  C21D8/02 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/21 ,  B21B1/22 ,  C21D6/00 ,  C22C38/22 ,  C23C2/12

Abstract: A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

公开(公告)号：US20180202017A1

公开(公告)日：2018-07-19

申请号：US15741290

申请日：2016-06-10

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/12 ,  B32B15/01 ,  B23K26/21 ,  B21B1/22 ,  B21D22/02

Abstract: A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

公开(公告)号：US11814696B2

公开(公告)日：2023-11-14

申请号：US17491785

申请日：2021-10-01

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/02 ,  C21D1/673 ,  C21D8/02 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/02 ,  B21B1/22 ,  C21D6/00 ,  C22C38/22 ,  C23C2/12

CPC classification number: C21D9/46 ,  B21B1/22 ,  B21D22/022 ,  B23K26/02 ,  B32B15/012 ,  C21D1/673 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C22C21/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C23C2/12 ,  B21B2001/225 ,  B32B2605/00 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The microstructure of the part includes, in a majority of the part, in surface fractions: less than 40% of bainite, less than 5% of austenite, less than 5% of ferrite, and a remainder being martensite. The martensite is fresh martensite and self-tempered martensite.

公开(公告)号：US11319610B2

公开(公告)日：2022-05-03

申请号：US15741290

申请日：2016-06-10

Applicant: ArcelorMittal

Inventor： Pascal Drillet ,  Maria Poirier ,  Sujay Sarkar

IPC: C21D9/46 ,  B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  B21D22/02 ,  C21D1/673 ,  C21D8/02 ,  C22C38/46 ,  C22C38/44 ,  C22C38/50 ,  C22C38/54 ,  C22C38/48 ,  C22C21/02 ,  B23K26/21 ,  B21B1/22 ,  C21D6/00 ,  C22C38/22 ,  C23C2/12

Abstract: A process for manufacturing a press hardened steel part is provided. The steel of the part has a chemical composition including, in weight: 0.062%≤C≤0.095%, 1.4%≤Mn≤1.9%, 0.2%≤Si≤0.5%, 0.020%≤Al≤0.070%, 0.02%≤Cr≤0.1%, wherein: 1.5%≤(C+Mn+Si+Cr)≤2.7%, 0.040%≤Nb≤0.060%, 3.4×N≤Ti≤8×N wherein: 0.044%≤(Nb+Ti)≤0.090%, 0.0005≤B≤0.004%, 0.001%≤N≤0.009%, 0.0005%≤S≤0.003%, 0.001%≤P≤0.020%, optionally: 0.0001%≤Ca≤0.003%, and the remainder being Fe and unavoidable impurities. The process includes hot forming the heated blank in the forming press so as to obtain a formed part and cooling the formed part at a cooling rate CR1 between 40 and 360°C/s in a temperature range from 750 to 450°C. and at a cooling rate CR2 between 15 to 150°C/s in a temperature range from 450°C to 250°C. wherein CR2