公开(公告)号：US20170101694A1

公开(公告)日：2017-04-13

申请号：US15374827

申请日：2016-12-09

Applicant: ArcelorMittal France

Inventor： Astrid Perlade ,  Olivier Bouaziz ,  Xavier Garat ,  Josée Drillet ,  Jean-Louis IRIARTE

IPC: C21D9/46 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C22C38/44

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D8/021 ,  C21D8/0215 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/041 ,  C21D8/0415 ,  C21D8/0426 ,  C21D8/0436 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50

Abstract: A cold-rolled and annealed ferritic steel sheet is provided. The steel has a composition comprising, expressed by weight: 0.001≦C≦0.15%; Mn≦1%; Si≦1.5%; 7.5%≦AI≦10%; 0.020%≦Ti≦0.5%; S≦0.050%; and P≦0.1%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The structure includes kappa (κ) precipitates and equiaxed ferrite, an average grain size dα of the equiaxed ferrite is less than 50 microns, and a linear fraction f of intergranular κ precipitates is less than 30%. The linear fraction f is defined by f = Σ ( A )  di Σ ( A )  Li . Σ(A)di denotes the total length of grain boundaries containing κ precipitates relative to an area (A) and Σ(A)Li denotes the total length of the grain boundaries relative to the area (A). A content of carbon in solid solution is less than 0.005% by weight, and the cold-rolled and annealed ferritic steel sheet has a thickness between 0.6 mm and 1.5 mm. A skin part or structural part for the automotive field is also provided.

公开(公告)号：US10900105B2

公开(公告)日：2021-01-26

申请号：US14404750

申请日：2013-05-27

Applicant: ARCELORMITTAL

Inventor： Astrid Perlade ,  Ian Alberto Zuazo Rodriguez ,  Xavier Garat

IPC: C22C38/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C21D8/02 ,  C21D9/46 ,  C21D6/00 ,  C21D8/04 ,  B21B1/46 ,  B21B45/02 ,  B21C47/02

Abstract: A rolled steel sheet is provided. The rolled steel sheet has a mechanical strength greater than or equal to 600 MPa and an elongation at fracture that is greater than or equal to 20%. A a method for its fabrication is also provided. The chemical composition of the steel sheet includes 0.10≤C≤0.30%, 6.0≤Mn≤15.0%, 6.0≤Al≤15.0%, and optionally one or more elements selected from among: Si≤2.0%, Ti≤0.2%, V≤0.6% and Nb≤0.3%. The remainder of the composition includes iron and the unavoidable impurities resulting from processing. The ratio of the weight of manganese to the weight of aluminum is such that Mn Al > 1.0 . The microstructure of the sheet includes ferrite, austenite and up to 5% Kappa precipitates in area fraction.

公开(公告)号：US09765415B2

公开(公告)日：2017-09-19

申请号：US15374827

申请日：2016-12-09

Applicant: ArcelorMittal France

Inventor： Astrid Perlade ,  Olivier Bouaziz ,  Xavier Garat ,  Josée Drillet ,  Jean-Louis Uriarte

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C21D9/46 ,  C21D6/005 ,  C21D8/021 ,  C21D8/0215 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/041 ,  C21D8/0415 ,  C21D8/0426 ,  C21D8/0436 ,  C21D2211/005 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50

Abstract: A cold-rolled and annealed ferritic steel sheet is provided. The steel has a composition comprising, expressed by weight: 0.001≦C≦0.15%; Mn≦1%; Si≦1.5%; 7.5%≦AI≦10%; 0.020%≦Ti≦0.5%; S≦0.050%; and P≦0.1%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The structure includes kappa (κ) precipitates and equiaxed ferrite, an average grain size dα of the equiaxed ferrite is less than 50 microns, and a linear fraction f of intergranular κ precipitates is less than 30%. The linear fraction f is defined by f = Σ ( A ) ⁢ di Σ ( A ) ⁢ Li . Σ(A)di denotes the total length of grain boundaries containing κ precipitates relative to an area (A) and Σ(A)Li denotes the total length of the grain boundaries relative to the area (A). A content of carbon in solid solution is less than 0.005% by weight, and the cold-rolled and annealed ferritic steel sheet has a thickness between 0.6 mm and 1.5 mm. A skin part or structural part for the automotive field is also provided.

公开(公告)号：US20150147221A1

公开(公告)日：2015-05-28

申请号：US14404750

申请日：2013-05-27

Applicant: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO, S.L.

Inventor： Astrid Perlade ,  Ian Alberto Zuazo Rodriguez ,  Xavier Garat

IPC: C22C38/14 ,  B21B1/46 ,  C22C38/02 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  B21B45/02 ,  B21C47/02

CPC classification number: C22C38/14 ,  B21B1/463 ,  B21B45/0203 ,  B21C47/02 ,  C21D6/005 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

Abstract: A rolled steel sheet is provided. The rolled steel sheet has a mechanical strength greater than or equal to 600 MPa and an elongation at fracture that is greater than or equal to 20%. A a method for its fabrication is also provided. The chemical composition of the steel sheet includes 0.10≦C≦0.30%, 6.0≦Mn≦15.0%, 6.0≦Al≦15.0%, and optionally one or more elements selected from among: Si≦2.0%, Ti≦0.2%, V≦0.6% and Nb≦0.3%. The remainder of the composition includes iron and the unavoidable impurities resulting from processing. The ratio of the weight of manganese to the weight of aluminum is such that Mn Al > 1.0 . The microstructure of the sheet includes ferrite, austenite and up to 5% Kappa precipitates in area fraction.

Abstract translation: 提供轧制钢板。 轧制钢板的机械强度大于等于600MPa，断裂伸长率大于等于20％。 还提供了一种其制造方法。 钢板的化学成分包括0.10＆lt; NlE; C＆nlE; 0.30％，6.0＆nlE; Mn＆nlE; 15.0％，6.0＆lt; A1; Al＆amp; 15.0;和任选的一种或多种选自以下的元素：Si＆NlE; 2.0％Ti＆ ％，V＆nlE; 0.6％和Nb＆nlE; 0.3％。 组合物的其余部分包括铁和由加工产生的不可避免的杂质。 锰的重量与铝的重量的比例使得Mn Al> 1.0。 片材的微观结构包括铁素体，奥氏体和面积分数中高达5％的Kappa沉淀物。