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1. 发明专利

JP2009120962A High-strength low-specific gravity steel sheet excellent in ductility, and its production method 有权
标题翻译：高强度高强度低特异性优质钢板及其生产方法
公开(公告)号：JP2009120962A
公开(公告)日：2009-06-04
申请号：JP2009026773
申请日：2009-02-06
申请人： Nippon Steel Corp , Toyota Motor Corp , トヨタ自動車株式会社 , 新日本製鐵株式会社
发明人： OKA MASAHARU , FUJITA NOBUHIRO , TAKAHASHI MANABU , SENUMA TAKEHIDE , TANIGUCHI YUICHI , SUDO SHUNTARO
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high-strength low-specific gravity steel sheet excellent in ductility, and to provide its production method.
SOLUTION: The high-strength low-specific gravity steel sheet excellent in ductility has a composition containing, by mass, 0.001 to 0.01% C, ≤3.0% Si, >3.0 to 30.0% Mn, ≤0.02% P, ≤0.01% S, 5.0 to 10.0% Al and 0.001 to 0.05% N, and, if required, containing one or more kinds of metals selected from 0.005 to 0.3% Ti, 0.005 to 0.3% Nb, 0.05 to 3.0% Cr, >5.0 to 15.0% Ni, 0.05 to 3.0% Mo, 0.1 to 3.0% Cu, 0.0003 to 0.01% B, 0.01 to 0.5% V, 0.001 to 0.01% Ca, 0.0005 to 0.01% Mg, 0.001 to 0.05% Zr and 0.001 to 0.05% rare earth metals, and the balance Fe with inevitable impurities, and also has a specific gravity of
摘要翻译：要解决的问题：提供优异的延展性的高强度低比重钢板，并提供其制造方法。解决方案：延展性优异的高强度低比重钢板具有质量分数为0.001〜0.01％的C，≤3.0％的Si，3.0〜30.0％的Mn，≤0.02％的P，≤ 0.01％S，5.0〜10.0％Al和0.001〜0.05％N，如果需要，可以含有选自0.005〜0.3％Ti，0.005〜0.3％Nb，0.05〜3.0％Cr，5.0以上的金属至15.0％Ni，0.05〜3.0％Mo，0.1〜3.0％Cu，0.0003〜0.01％B，0.01〜0.5％V，0.001〜0.01％Ca，0.0005〜0.01％Mg，0.001〜0.05％Zr和0.001〜0.05 ％稀土金属，余量为Fe与不可避免的杂质，比重<7.2，拉伸强度≥440MPa，伸长率≥25％。版权所有（C）2009，JPO＆INPIT

2. 发明专利

JP2005029889A High strength low specific gravity steel sheet excellent in ductility, and its production method 有权
标题翻译：高强度低强度特殊重量钢板及其生产方法
公开(公告)号：JP2005029889A
公开(公告)日：2005-02-03
申请号：JP2004074914
申请日：2004-03-16
申请人： Nippon Steel Corp , Toyota Motor Corp , トヨタ自動車株式会社 , 新日本製鐵株式会社
发明人： OKA MASAHARU , FUJITA NOBUHIRO , TAKAHASHI MANABU , SENUMA TAKEHIDE , TANIGUCHI YUICHI , SUDO SHUNTARO
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength low specific gravity steel sheet excellent in ductility, and to provide its production method. SOLUTION: The high strength low specific gravity steel sheet excellent in ductility has a composition containing, by mass, 0.001 to 0.01% C, ≤3.0% Si, 0.01 to 3.0% Mn, ≤0.02% P, ≤0.01% S, 5.0 to 10.0% Al and 0.001 to 0.05% N, and, if required, containing one or more kinds of metals selected from 0.005 to 0.3% Ti, 0.005 to 0.3% Nb, 0.05 to 3.0% Cr, 0.05 to 5.0% Ni, 0.05 to 3.0% Mo, 0.1 to 3.0% Cu, 0.0003 to 0.01% B, 0.01 to 0.5% V, 0.001 to 0.01% Ca, 0.0005 to 0.01% Mg, 0.001 to 0.05% Zr and 0.001 to 0.05% rare earth metals, and the balance Fe with inevitable impurities, and also has a specific gravity of COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供优异的延展性的高强度低比重钢板，并提供其制造方法。
解决方案：延展性优异的高强度低比重率钢板具有质量分数为0.001〜0.01％的C，≤3.0％的Si，0.01〜3.0％的Mn，≤0.02％的P，≤0.01％的S ，5.0〜10.0％的Al和0.001〜0.05％的N，如果需要，可以含有选自0.005〜0.3％的Ti，0.005〜0.3％的Nb，0.05〜3.0％的Cr，0.05〜5.0％的Ni，，0.05〜3.0％的Mo，0.1〜3.0％的Cu，0.0003〜0.01％的B，0.01〜0.5％的V，0.001〜0.01％的Ca，0.0005〜0.01％的Mg，0.001〜0.05的Zr和0.001〜0.05的稀土金属，余量为Fe与不可避免的杂质，比重<7.2，拉伸强度≥440MPa，伸长率≥25％。版权所有（C）2005，JPO＆NCIPI

3. 发明专利

JP2010133028A Method for manufacturing high-strength low-specific gravity steel sheet excellent in ductility 有权
标题翻译：制造高强度低特异性重量级钢板的方法
公开(公告)号：JP2010133028A
公开(公告)日：2010-06-17
申请号：JP2010003233
申请日：2010-01-08
申请人： Nippon Steel Corp , Toyota Motor Corp , トヨタ自動車株式会社 , 新日本製鐵株式会社
发明人： OKA MASAHARU , FUJITA NOBUHIRO , TAKAHASHI MANABU , SENUMA TAKEHIDE , TANIGUCHI YUICHI , SUDO SHUNTARO
IPC分类号： C21D9/46 , B21B3/00 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-strength low-specific gravity steel sheet excellent in ductility.
SOLUTION: The method for manufacturing the high-strength low-specific gravity steel sheet excellent in the ductility, the steel sheet having
摘要翻译：解决的问题：提供一种制造延展性优异的高强度低比重钢板的方法。解决方案：制造具有优异的延展性的高强度低比重钢板的方法，具有<7.2比重，≥440MPa拉伸强度和≥25％伸长率的钢板包括以下过程：加热钢坯以质量计为0.001-0.01％C，≤3.0％Si，0.01-3.0％Mn，≤0.02％P，≤0.01％S，5.0-10.0％Al，0.001-0.05％N，余量为Fe 不可避免的杂质在≥1,100℃的温度下; 并且在≥1000℃的温度和≥800℃的最终轧制温度下，对经过加热的钢坯进行包括至少1次以上的具有≥30％轧制压下率的大轧制压下率的热轧。版权所有（C）2010，JPO＆INPIT

4. 发明专利

JP2010121213A Method for manufacturing high-strength low-specific gravity steel sheet excellent in ductility 有权
标题翻译：制造高强度低特异性重量级钢板的方法
公开(公告)号：JP2010121213A
公开(公告)日：2010-06-03
申请号：JP2010003244
申请日：2010-01-08
申请人： Nippon Steel Corp , Toyota Motor Corp , トヨタ自動車株式会社 , 新日本製鐵株式会社
发明人： OKA MASAHARU , FUJITA NOBUHIRO , TAKAHASHI MANABU , SENUMA TAKEHIDE , TANIGUCHI YUICHI , SUDO SHUNTARO
IPC分类号： C21D9/46 , B21B3/00 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-strength low-specific gravity steel sheet excellent in ductility.
SOLUTION: In the method for manufacturing the high-strength low-specific gravity steel sheet excellent in ductility having a specific gravity of 0.2 to 3.0% Mn, ≤0.02% P, ≤0.02% S, 5.0-10.0% Al, 0.001-0.05% N and satisfied to 20
摘要翻译：解决的问题：提供一种制造延展性优异的高强度低比重钢板的方法。解决方案：在比重<7.2，拉伸强度≥440MPa，伸长率≥25％的延展性优异的高强度低比重钢的制造方法中，通过使用具有质量分数为0.001-0.01％C，≤3.0％Si，> 0.2-3.0％Mn，≤0.02％P的组成的钢坯，可获得延展性优异的高强度低比重钢板，≤0.02％S，5.0-10.0％Al，0.001-0.05％N，满足20 <（Mn / S），余量为Fe与不可避免的杂质，将钢坯加热至1100〜1.50℃的温度，在1000-1100℃的温度下，以大于30％的大轧制压下比进行至少一次以上的热轧，另外在800-850℃的精轧温度下进行卷取，温度600-700°C。版权所有（C）2010，JPO＆INPIT

5. 发明专利

JP2005068549A High strength low specific gravity steel sheet excellent in ductility and its manufacturing method 有权
标题翻译：高强度低强度特种钢板及其制造方法
公开(公告)号：JP2005068549A
公开(公告)日：2005-03-17
申请号：JP2004076617
申请日：2004-03-17
申请人： Nippon Steel Corp , Toyota Motor Corp , トヨタ自動車株式会社 , 新日本製鐵株式会社
发明人： OKA MASAHARU , FUJITA NOBUHIRO , TAKAHASHI MANABU , SENUMA TAKEHIDE , TANIGUCHI YUICHI , SUDO SHUNTARO
IPC分类号： B21B1/26 , B21B3/00 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength low specific gravity steel sheet having excellent ductility and its manufacturing method.
SOLUTION: The high strength thin steel sheet excellent in ductility comprises, by mass%, 0.001 to 0.01% C, ≤3.0% Si, 0.01 to 3% Mn, ≤0.02% P, ≤0.01% S, >10.0% to 32.0% Al, 0.001 to 0.05% % N, and one or more kinds of 0.05 to 6.0% Cr, 0.01 to 0.5 % Ce and 0.0003 to 0.03% B, and if necessary, one kind or two or more kinds of 0.005 to 0.3% Ti, 0.005 to 0.3% Nb, 0.05 to 5.0% Ni, 0.05 to 3.0% Mo, 0.1 to 3.0 % Cu, 0.01 to 0.5 V, 0.001 to 0.01% Ca, 0.0005 to 0.01% Mg and 0.001 to 0.05% Zr, and the balance and inevitable impurities. The steel sheet has
摘要翻译：要解决的问题：提供具有优良延展性的高强度低比重钢板及其制造方法。解决方案：延展性优异的高强度薄钢板以质量％计含有0.001〜0.01％C，≤3.0％Si，0.01〜3％Mn，≤0.02％P，≤0.01％S，> 10.0％至32.0％的Al，0.001至0.05％的N，以及0.05至6.0％的Cr，0.01至0.5％的Ce和0.0003至0.03％的B中的一种或多种，如果需要，可以使用一种或两种以上的0.005〜 0.3％Ti，0.005〜0.3％Nb，0.05〜5.0％Ni，0.05〜3.0％Mo，0.1〜3.0％Cu，0.01〜0.5V，0.001〜0.01％Ca，0.0005〜0.01％Mg和0.001〜0.05％，余量和不可避免的杂质。钢板具有<6.7比重，≥590MPa拉伸强度和≥10％伸长率。版权所有（C）2005，JPO＆NCIPI

6. 发明专利

JP2007216257A Method for manufacturing high-strength component, hot press forming die to be used in the same method, and partially fabricated component in the same method 审中-公开
标题翻译：用于制造高强度组件的方法，用同一方法使用的热压成型模具以及相同方法中的部分组织部件
公开(公告)号：JP2007216257A
公开(公告)日：2007-08-30
申请号：JP2006039077
申请日：2006-02-16
申请人： Toyota Motor Corp , トヨタ自動車株式会社
发明人： SUDO SHUNTARO
IPC分类号： B21D22/20 , B21D24/00 , C21D1/18
摘要： PROBLEM TO BE SOLVED: To easily carry out a blanking operation after a hot press process in manufacturing a high-strength component using a hot press technique.
SOLUTION: In a hot forming process, a heated steel plate 8 is formed so as to have the shape including a flange portion 22 to be gripped between an upper die 12 and a lower die 14, a corner portion 24, and a vertical wall portion 26 sandwiched between the side wall of a punch 20 and the inside of the forming bore of the upper die 14. In a die 10, a part of the portion for gripping the steel plate by means of the lower die 12 and the upper die 14 is provided with a heat insulating portion 18 to be composed of a material having a heat conductivity lower than that of the other portion of the die 10. The heat insulating portion 18 has an ability for transferring the heat of the steel plate 8 lower than that of other portions of the die 10 when the heated steel plate 8 is gripped. Therefore, the cooling speed of the steel plate 8 at that portion is slower than that at other portions, and as a result, the increase of the hardness due to the quenching phenomena can be suppressed. The portion having low hardness is used as the portion for the blanking operation.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：在使用热压技术制造高强度部件的热压加工之后容易地进行冲裁操作。解决方案：在热成型工艺中，加热钢板8形成为具有包括凸缘部分22的形状以被夹持在上模12和下模14之间，角部分24和夹在冲头20的侧壁和上模具14的成形孔的内侧之间的垂直壁部分26.在模具10中，用于通过下模12夹紧钢板的部分的一部分上模具14设置有由导热率低于模具10的另一部分的材料构成的绝热部分18.隔热部分18具有传递钢板8的热量的能力比加热的钢板8被夹持时的模具10的其他部分低。因此，该部分的钢板8的冷却速度比其他部分的冷却速度慢，结果可以抑制淬火现象引起的硬度的上升。低硬度部分用作消隐操作的部分。版权所有（C）2007，JPO＆INPIT

7. 发明专利

JP2011208264A Vehicle chassis member excellent in corrosion resistance and method of manufacturing the same 有权
标题翻译：耐腐蚀性优良的车辆座椅成员及其制造方法
公开(公告)号：JP2011208264A
公开(公告)日：2011-10-20
申请号：JP2010079669
申请日：2010-03-30
申请人： Nisshin Steel Co Ltd , Toyota Motor Corp , トヨタ自動車株式会社 , 日新製鋼株式会社
发明人： HOSOMI KAZUAKI , URANAKA MASAAKI , SHUDO TSUTOMU , SHIMIZU TAKESHI , SUDO SHUNTARO , IGARASHI MASAZUMI , SUDO TAKAHISA
IPC分类号： C23C2/06 , B23K9/00 , B23K9/23 , B23K103/04 , B23K103/16 , C22C18/04 , C22C38/00 , C22C38/06 , C22C38/14 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a vehicle chassis member excellent in the corrosion resistance in an arc welding part and having high strength.SOLUTION: The vehicle chassis member has the arc welding joint of molten Zn-Al-Mg alloy-plated steel sheet members having a sheet thickness of 1.0-3.0 mm, wherein the steel sheet surface that has had a plated layer before welding is covered with a Zn-Al-Mg alloy layer up to a welding bead end part continuously, an Al-Mg alloy layer exists between the Zn-Al-Mg alloy layer and the steel substrate. In the steel sheet surface within 2.0 mm from the welding bead end part, the Zn-Al-Mg alloy layer has an average Al concentration of 0.2-22.0 mass% and an average Mg concentration of 1.0-10.0 mass%, and Fe-Al alloy layer has an average Fe concentration of at most 70.0 mass%.
摘要翻译：要解决的问题：提供一种在电弧焊接部件中耐腐蚀性优异且强度高的车辆底盘部件。解决方案：车辆底盘部件具有熔融的Zn-Al-Mg合金镀层钢板部件的电弧焊接头具有1.0-3.0mm的板厚，其中在焊接前具有镀层的钢板表面连续地被焊珠端部覆盖Zn-Al-Mg合金层，存在Al-Mg合金层在Zn-Al-Mg合金层和钢基材之间。在焊接端部2.0mm以内的钢板表面中，Zn-Al-Mg合金层的平均Al浓度为0.2〜22.0质量％，平均Mg浓度为1.0〜10.0质量％，Fe-Al 合金层的Fe浓度平均为70.0质量％以下。

8. 发明专利

JP2007237204A Method for manufacturing high-strength component, hot press-forming die used for the same method, and intermediate formed product in the same method 审中-公开
标题翻译：用于制造高强度组分的方法，用于相同方法的热压成型模具和相同方法的中间形成的产品
公开(公告)号：JP2007237204A
公开(公告)日：2007-09-20
申请号：JP2006060580
申请日：2006-03-07
申请人： Toyota Motor Corp , トヨタ自動車株式会社
发明人： SUDO SHUNTARO
IPC分类号： B21D22/20 , B21D24/00 , B21D24/04 , B21D28/00
摘要： PROBLEM TO BE SOLVED: To easily perform mold release after a hot-pressing step when manufacturing a high-strength component by a hot-pressing technique.
SOLUTION: In a hot-forming step, a heated steel plate 8 is formed into a shape including: a flange part 22, which is sandwiched between a lower die 12 and an upper die 14; a corner part 24; and a vertical wall 26, which is sandwiched between the side wall of a punch 20 and the inside of a forming hole of the upper die 14. A recessed section 18 for heat insulation is formed in a part of a section of a die 10, in which section the steel plate is sandwiched between the lower die 12 and the upper die 14. Air in the recessed section makes the recessed section 18 have a lower capacity for releasing the heat of the steel plate 8 when the plate is sandwiched between the dies and heated, than the other parts of the die 10. Accordingly, the cooling speed of the part of the steel plate 8, which part faces the recessed section 18, is made slower compared with that of the other parts of the steel plate 8. Thus, the recessed section 18 has a function to suppress the increase in hardness of the steel plate 8, which is caused by quenching. The part of the steel plate 8 that has lower hardness is used as a portion for mold release.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：通过热压技术制造高强度组分时，可以容易地在热压步骤之后进行脱模。解决方案：在热成形步骤中，加热钢板8形成为包括：夹在下模12和上模14之间的凸缘部22; 角部24; 以及夹在冲头20的侧壁和上模14的成形孔的内侧之间的垂直壁26.在模具10的一部分的一部分中形成有用于隔热的凹部18，在该区域中，钢板夹在下模12和上模14之间。凹部中的空气使得当板夹在模具之间时，凹部18具有较低的释放钢板8的热量的能力并且比模具10的其他部分被加热。因此，与钢板8的其它部分相比，部分面向凹部18的钢板8的部分的冷却速度变慢。因此，凹部18具有抑制由淬火引起的钢板8的硬度增加的功能。将硬度较低的钢板8的部分作为脱模用部分。版权所有（C）2007，JPO＆INPIT

9. 发明专利

JP2005074467A Spot welding method and spot-welded steel sheet member 有权
标题翻译：点焊焊接方法和点焊焊接钢板
公开(公告)号：JP2005074467A
公开(公告)日：2005-03-24
申请号：JP2003307864
申请日：2003-08-29
申请人： Sumitomo Metal Ind Ltd , Toyoda Iron Works Co Ltd , Toyota Motor Corp , トヨタ自動車株式会社 , 住友金属工業株式会社 , 豊田鉄工株式会社
发明人： OBAYASHI AKIRA , MIYAJI SHINSUKE , SUDO SHUNTARO , IMAI KAZUHITO , FUJIMOTO HIRONORI
IPC分类号： B23K11/00 , B23K11/11 , B23K11/16 , B23K103/04 , B62D21/00 , B62D25/00 , B62D39/00 , F16S1/10
摘要： PROBLEM TO BE SOLVED: To provide a spot welding method capable of stably spot-welding three or more superimposed steel sheets mutually without causing welding defects even by using a movable spot welding machine.
SOLUTION: Among three or more steel sheets 1-3 to be superimposed mutually, the strongest one 2 is positioned between the other two steel sheets 1, 3. In such superimposed condition, the three steel sheets are held between a pair of electrode tips 12, 14, and then, the parts so held in-between are spot-welded to each other. Thus, the steel sheets 1, 3 having a relatively low strength or rigidity are situated on the outer side in the thickness direction so as to be brought into contact with the pair of electrode tips 12, 14, while the steel sheet having the highest strength or rigidity is situated on the inner side in the thickness direction. Consequently, the three or more superimposed steel sheets 1-3 are suitably spot-welded with stable quality free from welding defects even if a movable spot welding machine is used.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供即使使用可动点焊机也能够相互稳定地点焊三个以上的叠加钢板而不引起焊接缺陷的点焊方法。解决方案：在三个或更多个相互叠加的钢板1-3中，最强的一个2位于另外两个钢板1,3之间。在这种叠加状态下，三个钢板保持在一对电极头12,14，然后如此保持在其间的部件彼此点焊。因此，具有较低强度或刚性的钢板1,3位于厚度方向的外侧，以便与一对电极头12,14接触，而具有最高强度的钢板或刚性位于厚度方向的内侧。因此，即使使用可动点焊机，三种以上叠加钢板1-3适当地点焊，质量也不受焊接缺陷的影响。版权所有（C）2005，JPO＆NCIPI

10. 发明专利

JP2005074464A Hot-pressing formed product and its producing method 有权
标题翻译：热压成型产品及其生产方法
公开(公告)号：JP2005074464A
公开(公告)日：2005-03-24
申请号：JP2003307348
申请日：2003-08-29
申请人： Sumitomo Metal Ind Ltd , Toyoda Iron Works Co Ltd , Toyota Motor Corp , トヨタ自動車株式会社 , 住友金属工業株式会社 , 豊田鉄工株式会社
发明人： YOSHIKAWA YUKIHIRO , IMAI KAZUHITO , TOKI TAMOTSU , SUDO SHUNTARO , OBAYASHI AKIRA , ICHIKAWA MASANOBU
IPC分类号： B21D22/20
摘要： PROBLEM TO BE SOLVED: To provide a method for stably producing a hot-pressing formed product excellent in corrosion resistance, coating adhessiveness, corrosion resistance after coating and weldability without giving the damage to a die, and the hot-pressing formed product having such characteristics. SOLUTION: (1) A hot dip galvanized steel material or a galvannealed steel material having ≤0.35% Al content, or (2) zinc-electroplating steel material or Zn-Fe alloy electroplating steel material having ≤20% Fe content in the plating (In anyone, the plated quantity is 40-80 g/m 2 ) is hot-pressed, respectively and anyone as the formed product having an iron-zinc solid-solution phase near the surface layer, but no iron-zinc intermetallic compound phase and having zinc-oxide layer of ≤5μm average thickness at the upper part of this iron-zinc solid-solution phase and ≤5 mg/m 2 Al in the total content of Al oxide contained in the iron-zinc solid-solution phase and the zinc-oxide layer, is obtained. The heating at the hot-pressing time, is performed, with which after raising temperature to the range of 850-950°C from a room temperature under oxidizing atmosphere at ≤15°C/sec temperature rising rate, this steel material is held for ≥30 sec at this temperature so that the total of the temperature rising time and the holding time becomes ≥3 min. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：待解决的问题：提供一种稳定地制造耐腐蚀性，涂层粘合性，涂布后的耐腐蚀性和焊接性而不会对模具造成损伤的热压成形体的方法，以及热压成型体具有这样的特征。 <1>解决方案：（1）一种热镀锌钢材或含有≤0.35％Al含量的合金化热镀锌钢材，或（2）含有≤20％Fe含量的锌电镀钢材或Zn-Fe合金电镀钢材料电镀（任何人，电镀量为40〜80g / m 2＆lt; SP＆gt; 2＆lt; / SP＆gt;）分别被热压，任何人作为形成的产品在表面层附近具有铁 - 锌固溶相，但在该铁 - 锌固溶相的上部没有铁 - 锌金属间化合物相并具有平均厚度≤5μm的氧化锌层，并且在该铁 - 锌固溶体相的上部为≤5mg/ m 2 得到铁 - 锌固溶相和氧化锌层中所含的Al氧化物的总含量。进行热压时的加热，在室温下，在室温下以不高于15℃/秒的升温速度从室温升温到850-950℃，将该钢材保持在在该温度下≥30秒，使得升温时间和保持时间的总和变为≥3分钟。版权所有（C）2005，JPO＆NCIPI

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