Hot-rolled steel strip for high strength electric resistance welding pipe and manufacturing method thereof
    7.
    发明授权
    Hot-rolled steel strip for high strength electric resistance welding pipe and manufacturing method thereof 有权
    高强度电阻焊管热轧钢带及其制造方法

    公开(公告)号:US07501030B2

    公开(公告)日:2009-03-10

    申请号:US10807693

    申请日:2004-03-24

    IPC分类号: C22C38/00 C21D9/52

    摘要: A hot-rolled steel strip having superior low temperature toughness and weldability, which is suitably used as a starting material for high strength electric resistance welding pipe, is provided at a low cost without constructing new production facilities and increasing cost. The hot-rolled steel strip is low carbon steel containing at least one of about 0.5.% or less of Cu, about 0.5% or less of Ni, and about 0.5% or less of Mo, wherein Pcm represented by the following equation (1) is 0.17 or less: Pcm=(% C)+(% Si)/30+((% Mn)+(% Cu))/20+(% Ni)/60+(% Mo)/7+(% V)/10  Equation (1), (where (% M) indicates the content of element M on a mass percent basis), and the balance includes Fe and incidental impurities. In addition, in the entire microstructure, the ratio of bainitic ferrite, which is a primary phase, is controlled to be about 95 percent by volume or more.

    摘要翻译: 以低成本提供适合用作高强度电阻焊接管的起始材料的具有优异的低温韧性和焊接性的热轧钢带,而不需要构建新的生产设备并增加成本。 热轧钢带是含有Cu的0.5%以下,Ni约0.5%以下,Mo约0.5%以下中的至少一种的低碳钢,其中,Pcm为下述式(1 )= 0.17以下:<?in-line-formula description =“In-line Formulas”end =“lead”?> Pcm =(%C)+(%Si)/ 30 +((%Mn)+(% Cu))/ 20 +(%Ni)/ 60 +(%Mo)/ 7 +(%V)/ 10等式(1),<?在线公式描述=“在线公式”end =“tail “○”(其中(%M)表示元素M的含量,以质量%计),余量包括Fe和杂质。 此外,在整个微观结构中,将作为主相的贝氏体铁素体的比例控制在约95体积%以上。

    Cold rolled steel sheet and galvanized steel sheet having strain age hardenability and method of producing the same
    10.
    发明授权
    Cold rolled steel sheet and galvanized steel sheet having strain age hardenability and method of producing the same 有权
    具有应变时效淬透性的冷轧钢板和镀锌钢板及其制造方法

    公开(公告)号:US07101445B2

    公开(公告)日:2006-09-05

    申请号:US10654775

    申请日:2003-09-04

    IPC分类号: C22C38/06 C22C38/02 C22C38/04

    摘要: An object of the present invention is to provide a cold-rolled steel sheet and an alloyed hot-dip galvanized steel sheet in which tensile strength is effectively increased by press forming and heat treatment while maintaining excellent deep drawability in press forming. Specifically, a steel composition contains less than 0.01% of C, 0.005 to 1.0% of Si, 0.01 to 1.0% of Mn, 0.005 to 0.050% of Nb, 0.005 to 0.030% of Al, 0.005 to 0.040% of N, 0.0005 to 0.0015% of B, 0.05% or less of P, and 0.01% or less of S, the balance substantially composed of Fe, in which the following equations (1) and (2) are satisfied: N %≧0.0015+14/93·Nb %+14/27·Al %+14/11·B %  (1) C %≦(12/93)·Nb %.  (2)

    摘要翻译: 本发明的目的是提供一种冷压钢板和合金化的热浸镀锌钢板,其中通过冲压成形和热处理有效地提高了拉伸强度,同时保持了冲压成形时的优异的深冲性。 具体地说,钢组成包含C:0.01%以下,Si:0.005〜1.0%,Mn:0.01〜1.0%,Nb:0.005〜0.050%,Al:0.005〜0.030%,N:0.005〜0.040% 0.0015%的B,0.05%以下的P和0.01%以下的S,余量基本上由Fe组成,其中满足以下等式(1)和(2):<?在线公式描述 =“在线公式”end =“lead”?> N%> = 0.0015 + 14 / 93.Nb%+ 14 / 27.Al%+ 14 / 11.B%(1)<? description =“In-line Formulas”end =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead”?> C%<=(12/93).Nb%。 (2)<?in-line-formula description =“In-line Formulas”end =“tail”?>