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    Method for manufacturing high tensile strength steel plate
    1.
    发明授权
    Method for manufacturing high tensile strength steel plate 有权
    高抗拉强度钢板的制造方法

    公开(公告)号：US07648597B2

    公开(公告)日：2010-01-19

    申请号：US10585548

    申请日：2005-07-06

    申请人： Akihide Nagao ,  Kenji Oi

    发明人： Akihide Nagao ,  Kenji Oi

    IPC分类号： C21D8/02

    CPC分类号： C22C38/02 ,  C21D8/02 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06

    摘要： The present invention provides a method for manufacturing high tensile strength steel plate having 570 MPa (N/mm2) or larger tensile strength and having also extremely superior balance of strength and toughness both before PWHT and after PWHT to that of the conventional steel plates, by specifically specifying the temperature-rising rate at the plate thickness center portion of a quenched and tempered material during tempering, and to be concrete, the method has the steps of: casting a steel consisting essentially of 0.02 to 0.18% C, 0.05 to 0.5% Si, 0.5 to 2.0% Mn, 0.005 to 0.1% Al, 0.0005 to 0.008% N, 0.03% or less P, 0.03% or less S, by mass, and balance of Fe and inevitable impurities; hot-rolling the cast steel without cooling the steel to the Ar3 transformation point or lower temperature, or after reheating the steel to the Ac3 transformation point or higher temperature, to a specified plate thickness; cooling the steel by direct quenching from the Ar3 transformation point or higher temperature, or by accelerated cooling, to 400° C. or lower temperature; and then tempering the steel, using a heating apparatus being installed directly connecting the manufacturing line containing a rolling mill and a direct-quenching apparatus or an accelerated cooling apparatus, to 520° C. or above of the maximum ultimate temperature at the plate thickness center portion at an average temperature-rising rate of 1° C./s or larger at the plate thickness center portion up to a specified tempering temperature between 460° C. and the Ac1 transformation point.

    摘要翻译： 本发明提供一种具有570MPa（N / mm2）以上拉伸强度的高抗拉强度钢板的方法，并且在PWHT之前和PWHT之后的强度和韧性平衡优于常规钢板的强度和韧性平衡方法，通过 具体说明回火期间淬火回火材料的板厚中心部分的升温速率，并且为混凝土，该方法具有以下步骤：铸造基本上由0.02至0.18％C，0.05至0.5％ Si，0.5〜2.0％Mn，0.005〜0.1％Al，0.0005〜0.008％N，0.03％以下P，0.03％以下S，余量为Fe和不可避免的杂质; 热轧铸钢而不将钢冷却至Ar3相变点或更低温度，或者将钢再加热至Ac3相变点或更高温度至规定的板厚度; 通过从Ar3相变点或更高温度或通过加速冷却直接淬火至400℃或更低温度来冷却钢; 然后使用将包含轧机和直接淬火装置或加速冷却装置的生产线直接连接的加热装置回火至钢板厚度中心的最高极限温度的520℃以上 部分在板厚中心部分的平均升温速度为1℃/ s以上，直到规定的回火温度在460℃与Ac1相变点之间。

    High tensile strength steel material having excellent delayed fracture resistance property, and method of manufacturing the same
    2.
    发明授权
    High tensile strength steel material having excellent delayed fracture resistance property, and method of manufacturing the same 有权
    具有优异的耐延迟抗断裂特性的高抗拉强度钢材及其制造方法

    公开(公告)号：US08728257B2

    公开(公告)日：2014-05-20

    申请号：US11795362

    申请日：2006-05-29

    申请人： Kenji Oi ,  Akihide Nagao ,  Kenji Hayashi

    发明人： Kenji Oi ,  Akihide Nagao ,  Kenji Hayashi

    IPC分类号： C21D6/00 ,  C21D8/00 ,  C21D10/00

    CPC分类号： C21D9/08 ,  C21D9/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22

    摘要： The invention provides a high tensile strength steel material having a tensile strength of 600 MPa, which is excellent in delayed fracture resistance property, and a method of manufacturing the steel material. As means for this, a steel material contains, in mass percent, C of 0.02 to 0.25%, Si of 0.01 to 0.8%, Mn of 0.5 to 2.0%, Al of 0.005 to 0.1%, N of 0.0005 to 0.008%, P of 0.03% or less, and S of 0.03% or less. In addition, the steel material contains at least one element selected from Mo, Nb, V, and Ti, and contains at least one of Cu, Ni, Cr, W, B, Ca, REM and Mg, as needed. The remainder includes Fe and inevitable impurities. In addition, in the steel material, precipitates having an average grain size of 20 nm or less, which contains at least one of Mo, Nb, V and Ti, are contained in steel in the number of at least 5 per 250000 nm2, and a microstructure includes residual austenite in a volume fraction of 0.5 to 5%. When Ca to be added is specified to be 0.0010% to 0.0020%, it is specified that S is 0.0005% to 0.0020% and O is 0.0008% to 0.0025%. ACR is specified to be 0.2≦ACR(=(Ca−(0.18+130*Ca)*O)/1.25/S)≦1.0.

    摘要翻译： 本发明提供一种拉伸强度为600MPa，耐延迟断裂性优异的高强度钢材，以及钢材的制造方法。 作为这种方式，钢材以质量％计含有0.02〜0.25％的C，0.01〜0.8％的Si，0.5〜2.0％的Mn，0.005〜0.1％的Al，0.0005〜0.008％的N，P 为0.03％以下，S为0.03％以下。 此外，钢材含有选自Mo，Nb，V，Ti中的至少一种元素，根据需要含有Cu，Ni，Cr，W，B，Ca，REM和Mg中的至少一种。 余量包括Fe和不可避免的杂质。 此外，在钢材中，含有Mo，Nb，V，Ti中的至少一种的平均粒径为20nm以下的析出物，以每250000nm 2以上的数量含有钢， 显微组织包括体积分数为0.5〜5％的残余奥氏体。 当添加Ca为0.0010〜0.0020％时，规定S为0.0005〜0.0020％，O为0.0008〜0.0025％。 ACR指定为0.2＆nlE; ACR（=（Ca-（0.18 + 130 * Ca）* O）/1.25/S）＆nlE; 1.0。

    Method for Manufacturing High Tensile Strength Steel Plate
    5.
    发明申请
    Method for Manufacturing High Tensile Strength Steel Plate 有权
    制造高抗拉强度钢板的方法

    公开(公告)号：US20080283158A1

    公开(公告)日：2008-11-20

    申请号：US10585548

    申请日：2005-07-06

    申请人： Akihide Nagao ,  Kenji Oi

    发明人： Akihide Nagao ,  Kenji Oi

    IPC分类号： C21D8/02 ,  C22C38/00

    CPC分类号： C22C38/02 ,  C21D8/02 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06

    摘要： The present invention provides a method for manufacturing high tensile strength steel plate having 570 MPa (N/mm2) or larger tensile strength and having also extremely superior balance of strength and toughness both before PWHT and after PWHT to that of the conventional steel plates, by specifically specifying the temperature-rising rate at the plate thickness center portion of a quenched and tempered material during tempering, and to be concrete, the method has the steps of: casting a steel consisting essentially of 0.02 to 0.18% C, 0.05 to 0.5% Si, 0.5 to 2.0% Mn, 0.005 to 0.1% Al, 0.0005 to 0.008% N, 0.03% or less P, 0.03% or less S, by mass, and balance of Fe and inevitable impurities; hot-rolling the cast steel without cooling the steel to the Ar3 transformation point or lower temperature, or after reheating the steel to the AC3 transformation point or higher temperature, to a specified plate thickness; cooling the steel by direct quenching from the Ar3 transformation point or higher temperature, or by accelerated cooling, to 400° C. or lower temperature; and then tempering the steel, using a heating apparatus being installed directly connecting the manufacturing line containing a rolling mill and a direct-quenching apparatus or an accelerated cooling apparatus, to 520° C. or above of the maximum ultimate temperature at the plate thickness center portion at an average temperature-rising rate of 1° C./s or larger at the plate thickness center portion up to a specified tempering temperature between 460° C. and the Ac1 transformation point.

    摘要翻译： 本发明提供一种制造具有570MPa（N / mm 2以上）或更高拉伸强度的高抗拉强度钢板的方法，并且在PWHT之前和PWHT之后还具有非常优异的强度和韧性平衡 传统钢板的特征是通过具体指定回火期间淬火回火材料的板厚中心部分的温度上升率，并且为混凝土，该方法具有以下步骤：将基本上由0.02组成的钢浇铸到 0.18％C，0.05〜0.5％Si，0.5〜2.0％Mn，0.005〜0.1％Al，0.0005〜0.008％N，0.03％以下P，0.03％以下S，余量为Fe和不可避免的杂质 ; 热轧铸钢而不将钢冷却至Ar 3 3相变点或更低的温度，或者在将钢再加热到AC 3 3相变点或更高的温度之后，至 指定板厚; 通过从Ar 3 N 3相变点或更高温度或通过加速冷却直接淬火至400℃或更低的温度来冷却钢; 然后使用将包含轧机和直接淬火装置或加速冷却装置的生产线直接连接的加热装置回火至钢板厚度中心的最高极限温度的520℃以上 在板厚中心部分的平均升温速度为1℃/ s以上，直到460℃与Ac 1 H 1相变点之间的规定回火温度。

    High Tensile Strength Steel Material Having Excellent Delayed Fracture Resistance Property, and Method of Manufacturing the Same
    6.
    发明申请
    High Tensile Strength Steel Material Having Excellent Delayed Fracture Resistance Property, and Method of Manufacturing the Same 有权
    具有优异的延迟耐断裂性的高抗拉强度钢材及其制造方法

    公开(公告)号：US20080110535A1

    公开(公告)日：2008-05-15

    申请号：US11795362

    申请日：2006-05-29

    申请人： Kenji Oi ,  Akihide Nagao ,  Kenji Hayashi

    发明人： Kenji Oi ,  Akihide Nagao ,  Kenji Hayashi

    IPC分类号： C21D7/00 ,  C22C38/00

    CPC分类号： C21D9/08 ,  C21D9/10 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22

    摘要： The invention provides a high tensile strength steel material having a tensile strength of 600 MPa, which is excellent in delayed fracture resistance property, and a method of manufacturing the steel material. As means for this, a steel material contains, in mass percent, C of 0.02 to 0.25%, Si of 0.01 to 0.8%, Mn of 0.5 to 2.0%, Al of 0.005 to 0.1%, N of 0.0005 to 0.008%, P of 0.03% or less, and S of 0.03% or less. In addition, the steel material contains at least one element selected from Mo, Nb, V, and Ti, and contains at least one of Cu, Ni, Cr, W, B, Ca, REM and Mg, as needed. The remainder includes Fe and inevitable impurities. In addition, in the steel material, precipitates having an average grain size of 20 nm or less, which contains at least one of Mo, Nb, V and Ti, are contained in steel in the number of at least 5 per 250000 nm2, and a microstructure includes residual austenite in a volume fraction of 0.5 to 5%. When Ca to be added is specified to be 0.0010% to 0.0020%, it is specified that S is 0.0005% to 0.0020% and O is 0.0008% to 0.0025%. ACR is specified to be 0.2≦ACR(=(Ca-(0.18+130*Ca)*O)/1.25/S)≦1.0.

    摘要翻译： 本发明提供一种拉伸强度为600MPa，耐延迟断裂性优异的高强度钢材，以及钢材的制造方法。 作为这种方式，钢材以质量％计含有0.02〜0.25％的C，0.01〜0.8％的Si，0.5〜2.0％的Mn，0.005〜0.1％的Al，0.0005〜0.008％的N，P 为0.03％以下，S为0.03％以下。 此外，钢材含有选自Mo，Nb，V，Ti中的至少一种元素，根据需要含有Cu，Ni，Cr，W，B，Ca，REM和Mg中的至少一种。 余量包括Fe和不可避免的杂质。 此外，在钢材中，钢中含有Mo，Nb，V，Ti中的至少一种的平均粒径为20nm以下的析出物，以每250000nm 2，微观结构包括体积分数为0.5〜5％的残余奥氏体。 当添加Ca为0.0010〜0.0020％时，规定S为0.0005〜0.0020％，O为0.0008〜0.0025％。 ACR被指定为0.2 <= ACR（=（Ca-（0.18 + 130 * Ca）* O）/1.25/S）<= 1.0。