-
公开(公告)号：US20230019292A1
公开(公告)日：2023-01-19
申请号：US17943561
申请日：2022-09-13
申请人： ArcelorMittal
IPC分类号： C21D9/48 , C22C38/02 , C22C38/44 , C22C38/54 , C21D8/02 , C21D1/673 , C22C38/00 , C22C38/50 , C21D6/00 , C23C2/06 , C22C38/48 , C22C38/06 , C23C2/40 , B32B15/01 , C23C2/28 , C23C2/02 , C23C2/12 , C22C38/04
摘要： A rolled steel sheet, for press hardening is provided, having a chemical composition where Ti/N>3.42, and the carbon, manganese, chromium and silicon contents satisfy: 2.6 C + Mn 5.3 + Cr 13 + Si 15 ≥ 1.1 % . The sheet has a nickel content Nisurf at any point of the steel in the vicinity of the surface over a depth Δ, such that: Nisurf>Ninom, Ninom denoting the nominal nickel content of the steel, and such that, Nimax denoting the maximum nickel content within Δ: ( Ni max + Ni nom ) 2 × ( Δ ) ≥ 0.6 , and such that: ( Ni max - Ni nom ) Δ ≥ 0.01 and the surface density of all of the particles Di , and the surface density of the particles D(>2 μm) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet: Di+6.75 D(>2 μm) 2 μm) being expressed as number of particles per square millimeter, and said particles denoting all the oxides, sulfides, and nitrides, either pure or combined such as oxysulfides and carbonitrides, present in the steel matrix.
-
2.发明公开公开(公告)号：US20240254586A1
公开(公告)日：2024-08-01
申请号：US18625591
申请日：2024-04-03
申请人： ArcelorMittal
IPC分类号： C21D9/48 , B32B15/01 , C21D1/673 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40
CPC分类号： C21D9/48 , B32B15/012 , B32B15/013 , C21D1/673 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/022 , C23C2/024 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40 , C21D2211/002 , C21D2211/008
摘要： A method for manufacture of a hot-rolled steel sheet which includes: producing a liquid steel to which manganese, silicon, niobium, and chromium are added, the additions being made in a vacuum chamber, then desulfurizing the liquid metal without increasing its nitrogen content, then adding titanium, said additions being made so as to obtain a liquid metal having a chemical composition where the titanium and nitrogen contents satisfy: Ti/N>3.42, and the carbon, manganese, chromium, and silicon contents satisfy: 2.6C+Mn/5.3+Cr/13+Si/15>=1.1%, then casting a semi-finished product, then heating said semi-finished product to a temperature between 1250° C. and 1300° C. for a holding period at this temperature between 20 minutes and 45 minutes, then hot rolling said semi-finished product to a rolling end temperature TFL between 825° C. and 950° C., to obtain a hot-rolled sheet, then coiling said hot-rolled sheet at a temperature between 500° C. and 750° C. to obtain a hot-rolled and coiled sheet, then pickling the oxide layer formed in the previous steps.
-
搜索结果
2 条记录 (耗时 0.009 秒)
