HOT-ROLLED ULTRAHIGH STRENGTH STEEL STRIP PRODUCT
    3.
    发明申请
    HOT-ROLLED ULTRAHIGH STRENGTH STEEL STRIP PRODUCT 审中-公开
    热轧超高强度钢带产品

    公开(公告)号:US20160333440A1

    公开(公告)日:2016-11-17

    申请号:US15111332

    申请日:2015-01-23

    申请人: RAUTARUUKKI OYJ

    摘要: The present invention relates to thin hot-rolled ultrahigh strength steel (UHSS) products, i.e. to hot-rolled steel strips with ultrahigh strength and good bendability. The object of the present invention is to provide an ultrahigh strength hot-rolled steel product that is having yield strength Rp0.2 at least 840 MPa and improved bendability. Further, a preferred aim is also to achieve an ultrahigh strength steel strip with excellent low temperature impact toughness. The inventors of the present invention have surprisingly found that the bendability of directly quenched ultrahigh strength steel strip can be significantly improved by producing a microstructure comprising upper bainite as main phase and by having a hot-rolled steel strip product having a yield strength Rp0.2 at least 840 MPa and a thickness of less than 12 mm, whose composition in percentage by weight is C: 0.03-0.08, Si: 0.01-0.8, Mn: 0.8-2.5, Al: 0.01-0.15, Cr: 0.01-2.0, B: 0.0005-0.005 Nb: 0.005-0.07, Ti: 0.005-0.12, N:

    摘要翻译: 本发明涉及薄型热轧超高强度钢(UHSS)产品,即具有超高强度和良好弯曲性的热轧钢带。 本发明的目的是提供一种超高强度热轧钢产品,其具有至少840MPa的屈服强度Rp0.2和改进的弯曲性。 此外,优选的目的也是实现具有优异的低温冲击韧性的超高强度钢带。 本发明的发明人惊奇地发现,直接淬火的超高强度钢带的弯曲性可以通过生产包含上贝氏体作为主相的微观组织和通过具有屈服强度Rp0.2的热轧钢带产品而显着提高 至少840MPa,厚度小于12mm,其重量百分比为C:0.03-0.08,Si:0.01-0.8,Mn:0.8-2.5,Al:0.01-0.15,Cr:0.01-2.0, B:0.0005-0.005 Nb:0.005-0.07,Ti:0.005-0.12,N:<0.01,P:<0.02,S:<0.004,任选地Ca小于0.01,V小于0.1,Mo小于0.5,Cu 小于0.5,Hi小于0.5,其余为Fe和不可避免的杂质。

    HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THE SAME
    8.
    发明申请
    HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THE SAME 审中-公开
    高强度钢板及其制造方法

    公开(公告)号:US20140332123A1

    公开(公告)日:2014-11-13

    申请号:US14363166

    申请日:2012-11-29

    摘要: Provided are a high-strength steel sheet and a method for producing the same. A high-strength steel sheet has a composition containing 0.10% to 0.18% C, more than 0.5% to 1.5% Si, 0.5% to 1.5% Mn, 0.05% or less P, 0.005% or less S, and 0.05% or less Al on a mass basis, the remainder being Fe and inevitable impurities and also has a microstructure containing ferrite and pearlite. The volume fraction of the ferrite is 70% to 97%. The volume fraction of the pearlite is 3% or more. The volume fraction of cementite present at grain boundaries of the ferrite is 2% or less. The sum of the volume fractions of phases other than the ferrite, the pearlite, and the cementite is less than 3%. The average grain size of the ferrite is 7 μm or less.

    摘要翻译: 提供一种高强度钢板及其制造方法。 高强度钢板具有C:0.10〜0.18%,Si:0.5〜1.5%,Mn:0.5〜1.5%,P:0.05%以下,S:0.005%以下,0.05%以下 Al,其余为Fe和不可避免的杂质,并且还具有包含铁素体和珠光体的微结构。 铁素体的体积分数为70%〜97%。 珠光体的体积分数为3%以上。 存在于铁素体晶界的渗碳体的体积分率为2%以下。 铁素体,珠光体和渗碳体以外的相体积分数的总和小于3%。 铁素体的平均粒径为7μm以下。

    Method of hot-rolled thin steel sheet with excellent formability and excellent strength and toughness after heat treatment
    10.
    发明授权
    Method of hot-rolled thin steel sheet with excellent formability and excellent strength and toughness after heat treatment 有权
    热成型性优异,热处理后的强度和韧性优异的热轧薄钢板的制造方法

    公开(公告)号:US08182621B2

    公开(公告)日:2012-05-22

    申请号:US13251403

    申请日:2011-10-03

    IPC分类号: C21D8/02 C22C38/00

    摘要: A method of manufacturing a hot-rolled thin steel sheet includes: hot-rolling a steel base material having a composition containing, as mass %, C: 0.10 to 0.20%, Si: 0.01 to 1.0%, Mn: 0.5 to 2.0%, P: 0.03% or less, S: 0.01% or less, Al: 0.01 to 0.10%, N: 0.005% or less, Ti: 0.01 to 0.15%, B: 0.0005 to 0.0050%, the balance of Fe, and unavoidable impurities at a finishing temperature of finish rolling of 820 to 880° C. to produce a hot-rolled steel sheet with a thickness of less than 6 mm; cooling the hot-rolled steel sheet to a temperature range on a surface of the hot-rolled steel sheet to 550 to 650° C. at a surface cooling rate of 15 to 50° C. per second; and coiling the hot-rolled steel sheet at the temperature range.

    摘要翻译: 制造热轧薄钢板的方法包括:将具有质量%C:0.10〜0.20%,Si:0.01〜1.0%,Mn:0.5〜2.0%的组成的钢基材热轧, P:0.03%以下,S:0.01%以下,Al:0.01〜0.10%,N:0.005%以下,Ti:0.01〜0.15%,B:0.0005〜0.0050%,余量为Fe,不可避免的杂质 在820〜880℃的精轧终轧温度下,制造厚度小于6mm的热轧钢板; 将该热轧钢板的表面冷却速度为15〜50℃/秒,将该热轧钢板的表面冷却至550〜650℃, 并在该温度范围内卷取热轧钢板。