公开(公告)号：US20180010220A1

公开(公告)日：2018-01-11

申请号：US15711335

申请日：2017-09-21

Applicant: ARCELORMITTAL

Inventor： Sebastien Allain ,  Audrey Couturier ,  Thierry Iung ,  Christine Colin

IPC: C22C38/02 ,  C22C38/34 ,  C22C38/22 ,  C22C38/12 ,  C21D9/32 ,  C21D1/19 ,  C22C38/04 ,  C21D8/02 ,  C21D9/46 ,  C22C38/38 ,  C22C38/06

CPC classification number: C22C38/02 ,  C21D1/19 ,  C21D8/02 ,  C21D9/32 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/34 ,  C22C38/38

Abstract: The invention relates to a hot-rolled steel sheet having a tensile strength of greater than 1200 MPa, an Re/Rm ratio of less than 0.75 and an elongation at break of greater than 10%, the composition of which contains, the contents being expressed by weight: 0.10%≦C≦0.25%; 1%≦Mn≦3%; Al≧0.015%; Si≦1.985%; Mo≦0.30%; Cr≦1.5%; S≦0.015%; P≦0.1%; Co≦1.5%; B≦0.005%; it being understood that 1%≦Si+Al≦2%; Cr +(3×Mo)≦0.3%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% bainite, residual austenite in an amount equal to or greater than 5% and martensite in an amount equal to or greater than 2%.

公开(公告)号：US10370746B2

公开(公告)日：2019-08-06

申请号：US15711335

申请日：2017-09-21

Applicant: ARCELORMITTAL

Inventor： Sebastien Allain ,  Audrey Couturier ,  Thierry Iung ,  Christine Colin

IPC: C21D1/19 ,  C22C38/02 ,  C21D8/02 ,  C21D9/32 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/22 ,  C22C38/34 ,  C22C38/38

Abstract: The invention relates to a hot-rolled steel sheet having a tensile strength of greater than 1200 MPa, an Re/Rm ratio of less than 0.75 and an elongation at break of greater than 10%, the composition of which contains, the contents being expressed by weight: 0.10%≤C≤0.25%; 1%≤Mn≤3%; Al≥0.015%; Si≤1.985%; Mo≤0.30%; Cr≤1.5%; S≤0.015%; P≤0.1%; Co≤1.5%; B≤0.005%; it being understood that 1%≤Si+Al≤2%; Cr+(3×Mo)≥0.3%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% bainite, residual austenite in an amount equal to or greater than 5% and martensite in an amount equal to or greater than 2%.

公开(公告)号：US20160318080A1

公开(公告)日：2016-11-03

申请号：US15108132

申请日：2013-12-24

Applicant: ARCELORMITTAL

Inventor： Christian Moretto ,  Nicolas Pethe ,  Audrey Couturier

IPC: B21B1/22

CPC classification number: B21B1/22 ,  B21B27/10 ,  B21B37/00 ,  B21B45/0251 ,  B21B2001/225 ,  B21B2265/12 ,  B21B2265/20 ,  B21B2275/04 ,  B21B2275/06

Abstract: A method for the regulation of at least one of the parameters (α) of a hot rolling process of a semi-finished metal product in at least one rolling mill stand having at least two work rolls is provided. The regulation method includes calculating a forward slip ratio (FWS) with the following equation: FWS = | v exit - v stand | v stand where vexit is the speed of the semi-finished product at the exit of the respective stand and vstand is the linear velocity of the work rolls; calculating an estimated coefficient of friction (μreal) as a function of a measured value of the screwdown force (F) of the work rolls in the stand and of the forward slip ratio (FWS); and regulating at least one of the parameters (α) based on the calculated estimated coefficient of friction (μreal).

Abstract translation: 其中，vexit是相应支架出口处半成品的速度，vstand是工作辊的线速度; 计算作为在工作台中的工作辊的减速力（F）的测量值和前进滑移率（FWS）的函数的估计摩擦系数（μreal）; 以及基于所计算的估计摩擦系数（μreal）来调节参数（α）中的至少一个。