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    • 1. 发明申请
    • High strength steel sheet and method for manufacturing the same
    • 高强度钢板及其制造方法
    • US20060065329A1
    • 2006-03-30
    • US11271428
    • 2005-11-10
    • Tadashi InoueYoichi MotoyashikiHiroyasu KikuchiSadanori ImadaTakayuki OdakeYasunobu NagatakiToru Inazumi
    • Tadashi InoueYoichi MotoyashikiHiroyasu KikuchiSadanori ImadaTakayuki OdakeYasunobu NagatakiToru Inazumi
    • C23C2/28
    • C21D8/0226C21D8/0236C21D8/0263C22C38/008C22C38/04C22C38/12C22C38/14C22C38/24C23C2/02
    • The present invention relates to a high strength steel sheet consisting essentially of 0.04 to 0.1% C, 0.5% or less Si, 0.5 to 2% Mn, 0.05% or less P, 0.005% or less O, 0.005% or less S, by weight, having 10 μm or less of average ferritic grain size, and 20 mm/mm2 or less of generation frequency A, which generation frequency A is defined as the total length of a banded secondary phase structure observed per 1 mm2 of steel sheet cross section along the rolling direction thereof. The steel sheet is manufactured by, for example, a method comprising the steps of: hot-rolling a continuously cast slab having the composition described above at temperatures of Ar3 transformation point or above directly or after reheating thereof; and cooling the hot-rolled steel sheet within 2 seconds down to the temperatures of from 600 to 750° C. at cooling speeds of from 100 to 2,000° C./sec, followed by coiling the cooled steel sheet at temperatures of from 450 to 650° C. The present invention provides a high strength steel sheet having strengths of 340 MPa or more and having excellent stretch flanging performance, ductility, and shock resistance, providing a sufficient coil shape with good surface properties, even when hot dip zinc-coating is applied.
    • 高强度钢板本发明涉及一种高强度钢板,主要由以下组成的高强度钢板:基本上由Si:0.5〜0.1%,Si:0.5〜2%,Mn:0.05%以下,P:0.005%以下,O:0.005%以下,S: 平均铁素体晶粒尺寸为10μm以下,发生频率A为20mm / mm 2以下的发生频率A,将发生频率A定义为观察到的带状二相结构的总长度 每1mm 2钢板横截面沿其轧制方向。 钢板通过例如以下方法制造:包括以下步骤:在Ar 3相变点或更高的温度下直接或重新加热上述具有上述组成的连续铸造板坯 ; 并在200〜2000℃/秒的冷却速度下,在2秒钟内将热轧钢板冷却至600〜750℃的温度,然后将冷却后的钢板在450〜 650℃。本发明提供强度为340MPa以上且具有优异的拉伸凸缘性能,延展性和抗冲击性的高强度钢板,提供具有良好表面性能的足够的线圈形状,即使当热浸锌涂层 被申请;被应用。
    • 2. 发明授权
    • High strength steel sheet and method for manufacturing the same
    • 高强度钢板及其制造方法
    • US06663725B2
    • 2003-12-16
    • US09827597
    • 2001-04-05
    • Tadashi InoueHiroyasu KikuchiSadanori ImadaTakayuki Odake
    • Tadashi InoueHiroyasu KikuchiSadanori ImadaTakayuki Odake
    • C22C3840
    • C21D8/0226C21D8/0236C21D8/0263C22C38/008C22C38/04C22C38/12C22C38/14C22C38/24C23C2/02
    • The present invention relates to a high strength steel sheet consisting essentially of 0.04 to 0.1% C, 0.5% or less Si, 0.5 to 2% Mn, 0.05% or less P, 0.005% or less 0, 0.005% or less S, by weight, having 10 &mgr;m or less of average ferritic grain size, and 20 mm/mm2 or less of generation frequency A, which generation frequency A is defined as the total length of a banded secondary phase structure observed per 1 mm2 of steel sheet cross section along the rolling direction thereof. The steel sheet is manufactured by, for example, a method comprising the steps of: hot-rolling a continuously cast slab having the composition described above at temperatures of Ar3 transformation point or above directly or after reheating thereof; and cooling the hot-rolled steel sheet within 2 seconds down to the temperatures of from 600 to 750° C. at cooling speeds of from 100 to 2,000° C./sec, followed by coiling the cooled steel sheet at temperatures of from 450 to 650° C. The present invention provides a high strength steel sheet having strengths of 340 MPa or more and having excellent stretch flanging performance, ductility, and shock resistance, providing a sufficient coil shape with good surface properties, even when hot dip zinc-coating is applied.
    • 高强度钢板本发明涉及一种高强度钢板,其基本上由以下组成的组成:0.04〜0.1%的C,0.5%以下的Si,0.5〜2%的Mn,0.05%以下的P,0.005%以下的S,0.005%以下的S, 平均铁素体晶粒尺寸为10mum以下,发电频率A为20mm / mm 2以下的发电频率A定义为每1mm 2观察到的带状二相结构的总长度 >钢板横截面沿其轧制方向。 钢板通过例如以下方法制造:包括以下步骤:在Ar3相变点或更高温度下直接或重新加热后,对具有上述组成的连续铸造板坯进行热轧; 并在200〜2000℃/秒的冷却速度下,在2秒钟内将热轧钢板冷却至600〜750℃的温度,然后将冷却后的钢板在450〜 650℃。本发明提供强度为340MPa以上且具有优异的拉伸凸缘性能,延展性和抗冲击性的高强度钢板,提供具有良好表面性能的足够的线圈形状,即使当热浸锌涂层 被申请;被应用。