公开(公告)号：US07238431B2

公开(公告)日：2007-07-03

申请号：US10507148

申请日：2003-01-09

申请人： Kazuhiko Honda ,  Akira Takahashi ,  Yoshihiro Suemune ,  Hidetoshi Hatanaka ,  Tsuyoshi Miyake ,  Wataru Yamada ,  Koki Tanaka

发明人： Kazuhiko Honda ,  Akira Takahashi ,  Yoshihiro Suemune ,  Hidetoshi Hatanaka ,  Tsuyoshi Miyake ,  Wataru Yamada ,  Koki Tanaka

IPC分类号： B32B15/04 ,  B32B15/18 ,  B32B15/20

CPC分类号： B32B15/013 ,  C22C18/00 ,  C22C18/04 ,  C23C2/06 ,  C23C2/12 ,  Y10T428/12736 ,  Y10T428/12757 ,  Y10T428/12771 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/12993

摘要： The present invention provides a plated steel material, said plated steel material having a plated layer which contains Al of 4% or more in mass, excellent in surface smoothness even when a cooling rate is low. In the present invention: a plated layer which contains Al of 4% or more in mass and has an Al-type intermetallic compound in an Al phase or abutting on an Al phase is formed on the surface of a steel material; in particular, high corrosion-resistance is secured in various environments by using a plated layer containing Al of 4 to 20% and Mg of 1 to 10% in mass with the balance consisting of Zn and unavoidable impurities or a plated layer containing Al of 4 to 20%, Mg of 1 to 10% and Si of 0.001 to 2% in mass with the balance consisting of Zn and unavoidable impurities; said plated layer contains an intermetallic compound having a melting point of 600° C. or higher by 0.001 to 0.5% in mass; and a plated steel material having an excellent surface smoothness is obtained by using an Al-type intermetallic compound wherein at least one of the lattice constants is in the range from 3 to 5 Å.

摘要翻译： 本发明提供一种电镀钢材料，所述电镀钢材料具有镀层，其含有质量为4％以上的Al，即使在冷却速度低的情况下也具有优异的表面平滑性。 在本发明中，在钢材的表面上形成含有Al量为4％以上并具有Al相或Al相的Al系金属间化合物的Al的镀层， 特别地，通过使用含有4〜20％的Al的镀层和1〜10质量％的Mg，余量由Zn和不可避免的杂质构成的镀层或含有Al的镀层4，可以确保在各种环境下的高耐腐蚀性 至20％，Mg为1〜10％，Si为0.001〜2质量％，余量由Zn和不可避免的杂质构成; 所述镀层含有熔点为600℃以上0.001〜0.5质量％的金属间化合物; 并且通过使用其中至少一个晶格常数在3至5范围内的Al型金属间化合物，获得具有优异表面平滑度的电镀钢材料。

公开(公告)号：US20050123786A1

公开(公告)日：2005-06-09

申请号：US10507148

申请日：2003-01-09

申请人： Kazuhiko Honda ,  Akira Takahashi ,  Yoshihiro Suemune ,  Hidetoshi Hatanaka ,  Tsuyoshi Miyake ,  Wataru Yamada ,  Koki Tanaka

发明人： Kazuhiko Honda ,  Akira Takahashi ,  Yoshihiro Suemune ,  Hidetoshi Hatanaka ,  Tsuyoshi Miyake ,  Wataru Yamada ,  Koki Tanaka

IPC分类号： B32B15/01 ,  C22C18/00 ,  C22C18/04 ,  C23C2/06 ,  C23C2/12 ,  B32B15/00

CPC分类号： B32B15/013 ,  C22C18/00 ,  C22C18/04 ,  C23C2/06 ,  C23C2/12 ,  Y10T428/12736 ,  Y10T428/12757 ,  Y10T428/12771 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/12993

摘要： The present invention provides a plated steel material, said plated steel material having a plated layer which contains Al of 4% or more in mass, excellent in surface smoothness even when a cooling rate is low. In the present invention: a plated layer which contains Al of 4% or more in mass and has an Al-type intermetallic compound in an Al phase or abutting on an Al phase is formed on the surface of a steel material; in particular, high corrosion-resistance is secured in various environments by using a plated layer containing Al of 4 to 20% and Mg of 1 to 10% in mass with the balance consisting of Zn and unavoidable impurities or a plated layer containing Al of 4 to 20%, Mg of 1 to 10% and Si of 0.001 to 2% in mass with the balance consisting of Zn and unavoidable impurities; said plated layer contains an intermetallic compound having a melting point of 600° C. or higher by 0.001 to 0.5% in mass; and a plated steel material having an excellent surface smoothness is obtained by using an Al-type intermetallic compound wherein at least one of the lattice constants is in the range from 3 to 5 Å.

摘要翻译： 本发明提供一种电镀钢材料，所述电镀钢材料具有镀层，其含有质量为4％以上的Al，即使在冷却速度低的情况下也具有优异的表面平滑性。 在本发明中，在钢材的表面上形成含有Al量为4％以上并具有Al相或Al相的Al系金属间化合物的Al的镀层， 特别地，通过使用含有4〜20％的Al的镀层和1〜10质量％的Mg，余量由Zn和不可避免的杂质构成的镀层或含有Al的镀层4，可以确保在各种环境下的高耐腐蚀性 至20％，Mg为1〜10％，Si为0.001〜2质量％，余量由Zn和不可避免的杂质构成; 所述镀层含有熔点为600℃以上0.001〜0.5质量％的金属间化合物; 并且通过使用其中至少一个晶格常数在3至5范围内的Al型金属间化合物，获得具有优异表面平滑度的电镀钢材料。

公开(公告)号：US08592049B2

公开(公告)日：2013-11-26

申请号：US12162739

申请日：2006-07-31

申请人： Kazuhiko Honda ,  Tetsuo Nishiyama ,  Yoshihiro Suemune ,  Takeo Itoh ,  Koki Tanaka ,  Yoichi Ikematsu

发明人： Kazuhiko Honda ,  Tetsuo Nishiyama ,  Yoshihiro Suemune ,  Takeo Itoh ,  Koki Tanaka ,  Yoichi Ikematsu

IPC分类号： B32B15/04 ,  B32B15/18 ,  B32B15/20

CPC分类号： C23C2/06 ,  B32B15/013 ,  C21D8/0263 ,  C21D9/46 ,  C22C18/00 ,  C22C18/04 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/1266 ,  Y10T428/12674 ,  Y10T428/12799 ,  Y10T428/12972

摘要： Hot dip galvanized steel sheet excellent in shapeability and plateability comprised of high strength steel sheet according to the present invention can be provided containing, by mass % about, C: 0.05 to 0.25%, Si: 0.3 to 2.5%, Mn: 1.5 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, N: 0.0060% or less and the balance of Fe and unavoidable impurities. The exemplary steel sheet can have thereon a galvanized layer containing, e.g., about Al: 0.05 to 10 mass % and Fe: 0.05 to 3 mass % and the balance of Zn and unavoidable impurities. Such exemplary hot dip galvanized steel sheet can have oxides containing Si in an average content of about 0.6 to 10 mass % at the crystal grain boundaries and in the crystal grains at the sheet steel side 5 μm or less from the interface between the high strength steel sheet and the plating layer and by the presence of Fe—Zn alloy with an average grain size of about 0.5 to 3 μm at the plating side.

摘要翻译： 可以提供由本发明的高强度钢板构成的包含本发明的高强度钢板的热浸镀锌钢板，以质量％计含有C：0.05〜0.25％，Si：0.3〜2.5％，Mn：1.5〜2.8 ％，P：0.03％以下，S：0.02％以下，Al：0.005〜0.5％，N：0.0060％以下，余量由Fe和不可避免的杂质构成。 示例性的钢板可以具有含有例如约Al：0.05〜10质量％，Fe：0.05〜3质量％，余量的Zn和不可避免的杂质的镀锌层。 这种示例性热浸镀锌钢板可以具有平均含量在晶界的平均含量为0.6〜10质量％的氧化物和在钢板侧的晶粒中的氧化物与高强度钢之间的界面为5μm以下 并在镀层侧存在平均粒径约为0.5〜3μm的Fe-Zn合金。

公开(公告)号：US20100304183A1

公开(公告)日：2010-12-02

申请号：US12162739

申请日：2006-07-31

申请人： Kazuhiko Honda ,  Tetsuo Nishiyama ,  Yoshihiro Suemune ,  Takeo Itoh ,  Koki Tanaka ,  Yoichi Ikematsu

发明人： Kazuhiko Honda ,  Tetsuo Nishiyama ,  Yoshihiro Suemune ,  Takeo Itoh ,  Koki Tanaka ,  Yoichi Ikematsu

IPC分类号： B32B15/18 ,  B05D3/02 ,  B05D1/18 ,  C23C2/28

CPC分类号： C23C2/06 ,  B32B15/013 ,  C21D8/0263 ,  C21D9/46 ,  C22C18/00 ,  C22C18/04 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28 ,  Y10T428/1266 ,  Y10T428/12674 ,  Y10T428/12799 ,  Y10T428/12972

摘要： Hot dip galvanized steel sheet excellent in shapeability and plateability comprised of high strength steel sheet according to the present invention can be provided containing, by mass % about, C: 0.05 to 0.25%, Si: 0.3 to 2.5%, Mn: 1.5 to 2.8%, P: 0.03% or less, S: 0.02% or less, Al: 0.005 to 0.5%, N: 0.0060% or less and the balance of Fe and unavoidable impurities. The exemplary steel sheet can have thereon a galvanized layer containing, e.g., about Al: 0.05 to 10 mass % and Fe: 0.05 to 3 mass % and the balance of Zn and unavoidable impurities. Such exemplary hot dip galvanized steel sheet can have oxides containing Si in an average content of about 0.6 to 10 mass % at the crystal grain boundaries and in the crystal grains at the sheet steel side 5 μm or less from the interface between the high strength steel sheet and the plating layer and by the presence of Fe—Zn alloy with an average grain size of about 0.5 to 3 μm at the plating side.

摘要翻译： 可以提供由本发明的高强度钢板构成的包含本发明的高强度钢板的热浸镀锌钢板，以质量％计含有C：0.05〜0.25％，Si：0.3〜2.5％，Mn：1.5〜2.8 ％，P：0.03％以下，S：0.02％以下，Al：0.005〜0.5％，N：0.0060％以下，余量由Fe和不可避免的杂质构成。 示例性的钢板可以具有含有例如约Al：0.05〜10质量％，Fe：0.05〜3质量％，余量的Zn和不可避免的杂质的镀锌层。 这种示例性的热浸镀锌钢板可以具有在晶界处平均含量为约0.6〜10质量％的Si的氧化物和在钢板侧的晶粒中的高强度钢之间的界面为5μm以下的氧化物 并在镀层侧存在平均粒径约为0.5〜3μm的Fe-Zn合金。

公开(公告)号：US20060292391A1

公开(公告)日：2006-12-28

申请号：US10552668

申请日：2004-03-30

申请人： Yoichi Ikematsu ,  Koki Tanaka ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

发明人： Yoichi Ikematsu ,  Koki Tanaka ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

IPC分类号： B05D1/18 ,  C25D5/10

CPC分类号： C22C38/58 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  Y10S428/939 ,  Y10T428/12799

摘要： A molten zinc plated steel sheet superior in plating bondability and provided with both strength and shapeability is provided and a method of producing this molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps is provided, said molten zinc plated steel sheet characterized by comprising, by wt %, a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn plating layer containing Al: 0.01 to 1% and the balance of Zn and unavoidable impurities and containing inside the steel sheet within 2 μm from the interface of said plating layer and steel sheet oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, or complex oxide comprised of at least two of Al, Si, and Mn.

摘要翻译： 提供了具有优异的电镀结合能力并具有强度和成形性的熔融镀锌钢板，以及通过连续镀锌生产系统生产该熔融镀锌钢板的方法，其能够以低成本生产而不修改该系统或 提供了以下步骤：所述熔融镀锌钢板，其特征在于，以重量％计含有C：0.05〜0.40％，Si：0.2〜3.0％，Mn：0.1〜2.5％的钢板，余量由 Fe和不可避免的杂质，其表面上含有Al：0.01〜1％的Zn镀层和余量的Zn和不可避免的杂质，并且在钢板内部含有2μm以下的镀覆层和钢板氧化物粒子的界面 选自Al氧化物，Si氧化物，Mn氧化物或由Al，Si和Mn中的至少两种构成的复合氧化物中的至少一种氧化物。

公开(公告)号：US07695826B2

公开(公告)日：2010-04-13

申请号：US10551159

申请日：2004-03-30

申请人： Koki Tanaka ,  Yoichi Ikematsu ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

发明人： Koki Tanaka ,  Yoichi Ikematsu ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

IPC分类号： B32B15/18 ,  C23C2/28 ,  C23C2/06

CPC分类号： C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： The present invention provides an alloyed molten zinc plated steel sheet having an area of the Fe and Zn alloy phase in the unformed parts in the plating layer of less than 10% of the area of the steel sheet as a whole and superior in strength and shapeability and a method of producing this alloyed molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps, said alloyed molten zinc plated steel sheet characterized by comprising a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn alloy plating layer comprised of Fe in a concentration of 7 to 15 wt %, Al in a concentration of 0.01 to 1 wt %, and the balance of Zn and unavoidable impurities, said plating layer containing oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, and complex oxides of the same alone or in combination.

摘要翻译： 本发明提供一种合金化的镀锌钢板，其镀层中未成形部分中的Fe和Zn合金相的面积小于钢板整体面积的10％，强度和成形性优良 以及通过连续镀锌生产系统生产该合金化熔融镀锌钢板的方法，其能够在不改变系统或添加步骤的情况下以低成本生产，所述合金化的镀锌钢板的特征在于包括： C：0.05〜0.40％，Si：0.2〜3.0％，Mn：0.1〜2.5％，余量由Fe和不可避免的杂质组成，其表面上含有浓度为7〜15的Fe的Zn合金镀层 重量％，Al为0.01〜1重量％的Al，余量由Zn和不可避免的杂质构成，所述镀层含有选自Al氧化物，Si氧化物，Mn氧化物中的至少一种氧化物的氧化物粒子，以及 相同的复合氧化物单独或组合使用。

公开(公告)号：US07687152B2

公开(公告)日：2010-03-30

申请号：US10552668

申请日：2004-03-30

申请人： Yoichi Ikematsu ,  Koki Tanaka ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

发明人： Yoichi Ikematsu ,  Koki Tanaka ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

IPC分类号： B32B15/18 ,  C22C2/02 ,  C22C2/06 ,  C21D1/76

CPC分类号： C22C38/58 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  Y10S428/939 ,  Y10T428/12799

摘要： A molten zinc plated steel sheet superior in plating bondability and provided with both strength and shapeability is provided and a method of producing this molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps is provided, said molten zinc plated steel sheet characterized by comprising, by wt %, a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn plating layer containing Al: 0.01 to 1% and the balance of Zn and unavoidable impurities and containing inside the steel sheet within 2 μm from the interface of said plating layer and steel sheet oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, or complex oxide comprised of at least two of Al, Si, and Mn.

摘要翻译： 提供了具有优异的电镀结合能力并具有强度和成形性的熔融镀锌钢板，以及通过连续镀锌生产系统生产该熔融镀锌钢板的方法，其能够以低成本生产而不修改该系统或 提供了以下步骤：所述熔融镀锌钢板，其特征在于，以重量％计含有C：0.05〜0.40％，Si：0.2〜3.0％，Mn：0.1〜2.5％的钢板，余量由 Fe和不可避免的杂质，其表面上含有Al：0.01〜1％的Zn镀层，余量为Zn和不可避免的杂质，并且在钢板的内部含有距离所述镀层和钢板氧化物粒子的界面2μm以内 选自Al氧化物，Si氧化物，Mn氧化物或由Al，Si和Mn中的至少两种构成的复合氧化物中的至少一种氧化物。

公开(公告)号：US20060269776A1

公开(公告)日：2006-11-30

申请号：US10551159

申请日：2004-03-30

申请人： Koki Tanaka ,  Yoichi Ikematsu ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

发明人： Koki Tanaka ,  Yoichi Ikematsu ,  Shunichi Hayashi ,  Hideaki Sawada ,  Akira Takahashi ,  Kazuhiko Honda ,  Masayoshi Suehiro ,  Yoshihisa Takada

IPC分类号： B05D1/18 ,  C23C2/28 ,  C25D5/10

CPC分类号： C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： The present invention provides an alloyed molten zinc plated steel sheet having an area of the Fe and Zn alloy phase in the unformed parts in the plating layer of less than 10% of the area of the steel sheet as a whole and superior in strength and shapeability and a method of producing this alloyed molten zinc plating steel sheet by a continuous zinc plating production system which enables production at a low cost without modification of the system or addition of steps, said alloyed molten zinc plated steel sheet characterized by comprising a steel sheet including C: 0.05 to 0.40%, Si: 0.2 to 3.0%, and Mn: 0.1 to 2.5%, the balance comprised of Fe and unavoidable impurities, having on its surface a Zn alloy plating layer comprised of Fe in a concentration of 7 to 15 wt %, Al in a concentration of 0.01 to 1 wt %, and the balance of Zn and unavoidable impurities, said plating layer containing oxide particles of at least one type of oxide selected from an Al oxide, Si oxide, Mn oxide, and complex oxides of the same alone or in combination.

摘要翻译： 本发明提供一种合金化的镀锌钢板，其镀层中未成形部分中的Fe和Zn合金相的面积小于钢板整体面积的10％，强度和成形性优良 以及通过连续镀锌生产系统生产该合金化熔融镀锌钢板的方法，其能够在不改变系统或添加步骤的情况下以低成本生产，所述合金化的镀锌钢板的特征在于包括： C：0.05〜0.40％，Si：0.2〜3.0％，Mn：0.1〜2.5％，余量由Fe和不可避免的杂质组成，其表面上含有浓度为7〜15的Fe的Zn合金镀层 重量％，Al为0.01〜1重量％的Al，余量由Zn和不可避免的杂质构成，所述镀层含有选自Al氧化物，Si氧化物，Mn氧化物中的至少一种氧化物的氧化物粒子，以及 相同的复合氧化物单独或组合使用。

公开(公告)号：US08491734B2

公开(公告)日：2013-07-23

申请号：US10568997

申请日：2004-08-19

申请人： Kazuhiko Honda ,  Koki Tanaka

发明人： Kazuhiko Honda ,  Koki Tanaka

IPC分类号： C23C2/28

CPC分类号： C22C38/06 ,  C21D1/76 ,  C21D8/0273 ,  C21D8/0278 ,  C21D9/561 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C23C2/02 ,  C23C2/40

摘要： A process of production for producing a high strength galvannealed steel sheet by a hot-dip galvanized steel sheet production equipment using an all radiant tube type annealing furnace and a production equipment for the same are provided, comprising continuously hot-dip galvanizing a high strength steel sheet having a content of Si of 0.4 to 2.0 wt % during which making the atmosphere of the reducing zone an atmosphere containing H2 to 1 to 60 wt % and comprised of the balance of N2, H2O, O2, CO2, CO, and unavoidable impurities, controlling the log (PCO2/PH2) of the carbon dioxide partial pressure and hydrogen partial pressure in the atmosphere to log (PCO2/PH2)≦−0.5 and the log (PH2O/PH2) of the water partial pressure and hydrogen partial pressure to log (PH2O/PH2)≦−0.5, and controlling the log (PT/PH2) of the total partial pressure PT of the carbon dioxide partial pressure PCO2 and water partial pressure PH2O and the hydrogen partial pressure to −3≦log (PT/PH2)≦−0.5.

摘要翻译： 提供一种通过使用全辐射管型退火炉的热浸镀锌钢板生产设备及其生产设备生产高强度合金化热镀锌钢板的生产方法，其包括连续热浸镀锌高强度钢 其中Si的含量为0.4-2.0重量％，其中使还原区的气氛为包含H 2至1至60重量％的气氛，并且由N 2，H 2 O，O 2，CO 2，CO和不可避免的杂质构成 ，控制大气中二氧化碳分压和氢分压的对数（PCO2 / PH2）对数（PCO2 / PH2）@ -0.5和水分压和氢分压的对数（PH2O / PH2）分别为 对数（PH2O / PH2）@ -0.5，并控制二氧化碳分压PCO2和水分压PH2O的总分压PT的log（PT / PH2）和氢分压为-3 @ log（PT / PH2）@ - 0.5。

公开(公告)号：US07678204B2

公开(公告)日：2010-03-16

申请号：US10732336

申请日：2003-12-09

申请人： Toshiyuki Katsumi ,  Kazuhiko Honda ,  Koki Tanaka ,  Kaoru Yamazaki ,  Takahiro Tanae ,  Katsuyoshi Kaneko ,  Yoshikazu Umeno ,  Yoshitaka Okitsu

发明人： Toshiyuki Katsumi ,  Kazuhiko Honda ,  Koki Tanaka ,  Kaoru Yamazaki ,  Takahiro Tanae ,  Katsuyoshi Kaneko ,  Yoshikazu Umeno ,  Yoshitaka Okitsu

IPC分类号： C22C38/14

CPC分类号： C22C38/02 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0278 ,  C21D9/46 ,  C22C38/04 ,  C25D13/16 ,  Y10S148/902

摘要： The present invention: provides a good-workability and high-strength cold-rolled steel sheet excellent in post-painting corrosion resistance to the extent of securing excellent resistance to salt warm water immersion which is a good-workability and high-strength cold-rolled steel sheet excellent in post-painting corrosion resistance characterized in that: said steel sheet contains, in mass, 0.16 to 0.19% C, 1.10 to 1.30% Si, 1.50 to 1.60% Mn, not more than 0.1% P and 0.015 to 0.050% Al, with the balance consisting of Fe and unavoidable impurities; the average of the amount of Si incrassating on the surface of said steel sheet is not more than 20 times the Si concentration in said steel sheet; and the area percentage of the portions where the ratio of the Si concentration on the surface of said steel sheet to the Si concentration in said steel sheet is not less than 10 is not more than 95%.

摘要翻译： 本发明提供了一种优良的耐后腐蚀性的耐热性好的高强度冷轧钢板，其耐盐性好，耐热性好，耐高温冷轧 所述钢板以质量计含有C：0.16〜0.19％，Si：1.10〜1.30％，Mn：1.50〜1.60％，P：0.1％以下，0.015〜0.050％ Al，余量由Fe和不可避免的杂质组成; 所述钢板的表面上Si的平均含量不超过所述钢板的Si浓度的20倍; 所述钢板表面的Si浓度与所述钢板的Si浓度之比为10以上的部分的面积百分比为95％以下。