专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2008189987A Hot rolled steel sheet for tailored blank, and tailored blank 有权
标题翻译：热轧空白板和热轧空白板的热轧钢板
公开(公告)号：JP2008189987A
公开(公告)日：2008-08-21
申请号：JP2007024807
申请日：2007-02-02
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： NISHIHATA HITOMI , IMAI NORIO , UCHIHARA MASATO , TAIYAMA MASANORI , TOMITA TOSHIRO , YOSHIDA MITSURU , FUKUSHIMA MASAHIRO , KONO YOSHIORI , WAKITA MASAYUKI , TOKI TAMOTSU , OGAWA KAZUHIRO
IPC分类号： C22C38/00 , C21D9/46 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet for a tailored blank, and to provide a tailored blank.
SOLUTION: The hot rolled steel sheet for a tailored blank is made of a carbon steel or a low alloy steel comprising ferrite as the main phase and comprising martensite in a volume ratio of ≤5%, and in which the average crystal grain diameter D (μm) of the ferrite in the depth of the 1/4 of the sheet thickness from the steel sheet surface satisfies the following inequalities (1) and (2), further, the increasing speed X (μm/min) at 700°C in the average crystal grain diameter of the ferrite in the depth position of the 1/4 of the sheet thickness from the steel sheet surface, and the average crystal grain diameter D (μm) satisfy the following inequality (3), and C equivalent (Ceq) defined by the following inequality (4) is 0.10 to 0.33, and also disclosed is a tailored blank: inequality (1) 1.2≤D≤7; inequality (2) D≤2.7+5000/(5+350*C+40*Mn)
2 ; inequality (3) D*X≤0.1; and inequality (4) Ceq=C+Mn/9+Si/24+Cr/5+Mo/4+Ni/40+V/14.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供用于定制坯料的热轧钢板，并提供定制的坯料。解决方案：用于定制坯料的热轧钢板由碳素钢或含有铁素体作为主相的低合金钢制成，并且包含体积比≤5％的马氏体，其中平均晶粒在钢板表面的1/4厚度的铁素体的直径D（μm）满足以下不等式（1）和（2），另外，700℃时的增加速度X（μm/ min）在钢板表面的1/4厚度的深度位置的铁素体的平均晶粒直径和平均晶粒直径D（μm）满足以下不等式（3），C 由以下不等式（4）定义的等效（Ceq）为0.10〜0.33，并且还公开了定制空白：不等式（1）1.2≤D≤7; 不等式（2）D≤2.7+ 5000 /（5 + 350 * C + 40 * Mn） 2 不等式（3）D *X≤0.1; 和不等式（4）Ceq = C + Mn / 9 + Si / 24 + Cr / 5 + Mo / 4 + Ni / 40 + V / 14。版权所有（C）2008，JPO＆INPIT

2. 发明专利

JP2007044697A Method for producing hot rolled steel sheet having fine ferrite structure 有权
标题翻译：用于生产具有细小结构的热轧钢板的方法
公开(公告)号：JP2007044697A
公开(公告)日：2007-02-22
申请号：JP2005228369
申请日：2005-08-05
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： FUKUSHIMA MASAHIRO , ETO MANABU , SASAKI TAMOTSU , KONO YOSHIORI , WAKITA MASAYUKI
IPC分类号： B21B3/00 , B21B1/26 , B21B45/02 , C21D9/46 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a production method for making crystal grains finer than heretofore, concretely, for obtaining the average ferrite crystal grain size of
摘要翻译：要解决的问题：为了提供使晶粒细化的制造方法，具体地，为了获得<2μm的平均铁素体晶粒尺寸。解决方案：制造方法包括：初级轧制（20）的A阶段，其中将质量为0.04〜0.20％的Si，0.01〜2.0％的Si和0.5〜3.0％的Mn，以及余量轧制具有不可避免的杂质的铁，使其在轧制结束时的结构由奥氏体单相组成，其平均粒径控制为≤30μm; 包括二次轧制的B阶段，其中依次进行A阶段的一次轧制，以30〜55％的压下量进行，使轧机的入口侧温度控制在Ae3相变点以上的温度范围 ; 包括第三轧制的C阶段，其中在B阶段之后以35％至60％的压下率进行一次轧制，使得轧机的入口侧温度被控制在规定的温度范围; 和D阶段，其中依次在0.2秒内以≥600℃/秒的冷却速度进行（Ae3相变点-130℃）或以下的冷却。版权所有（C）2007，JPO＆INPIT

3. 发明专利

JP2009279629A Apparatus and method for manufacturing hot-rolled steel sheet 有权
标题翻译：制造热轧钢板的装置和方法
公开(公告)号：JP2009279629A
公开(公告)日：2009-12-03
申请号：JP2008135611
申请日：2008-05-23
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： ETO MANABU , HARAGUCHI YOICHI , FUKUSHIMA MASAHIRO
IPC分类号： B21B45/02 , B21B1/26 , B21B39/12
摘要： PROBLEM TO BE SOLVED: To provide a cooling apparatus which can rapidly cool a steel sheet at a short distance on the exit side of the last stand of a rolling mill without causing trouble in passing the leading end of the steel sheet and/or causing scratches on the steel sheet, whereby a hot-rolled steel sheet of which the ferritic grain is fine and which has high strength is manufactured stably.
SOLUTION: The apparatus 10 for manufacturing the hot-rolled steel sheet comprises a hot finish rolling mill 2 for rolling a steel sheet 1, a plurality of conveying table rolls 5, and a first steel sheet cooling device 11 having a plurality of spray nozzles 4b for cooling the steel sheet which are placed at a plurality of positions between two adjoining conveying table rolls 5 and 5 and spray cooling water 4c in a fan-like or conical form to the steel sheet 1. The installation position of the plurality of the conveying table rolls 5 is changeable in a range between an ascending position and a descending position at the time of conveying the steel sheet 1 in which prescribed tension has been given, so that an effective cooling area where the cooling water 4c sprayed from the plurality of the spray nozzles 4b impinges on the steel sheet 1 can be enlarged and the steel sheet 1 can be rapidly cooled at the short distance on the exit side of the last stand of the hot finish rolling mill 2.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种冷却装置，其可以在轧机的最后机座的出口侧以短距离快速冷却钢板，而不会导致钢板的前端通过和/ 或者在钢板上产生划痕，由此稳定地制造铁素体晶粒细小且强度高的热轧钢板。解决方案：用于制造热轧钢板的装置10包括用于轧制钢板1的热精轧机2，多个输送台辊5和具有多个输送台辊的第一钢板冷却装置11 用于冷却放置在两个邻接的输送台辊5和5之间的多个位置的钢板的喷嘴4b和以扇形或锥形形式喷射到钢板1的冷却水4c。多个输送台辊5在输送规定的张力的钢板1时在上升位置和下降位置之间的范围内是可变的，从而有效的冷却区域，其中冷却水4c从可以扩大冲击在钢板1上的多个喷嘴4b，并且能够在热精轧机2的最后一台的出口侧的短距离处快速冷却钢板1 。版权所有（C）2010，JPO＆INPIT

4. 发明专利

JP2008189986A Hot rolled steel sheet, and spot-welded-member 有权
标题翻译：热轧钢板和点焊焊接部件
公开(公告)号：JP2008189986A
公开(公告)日：2008-08-21
申请号：JP2007024790
申请日：2007-02-02
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： NISHIHATA HITOMI , YOSHIDA MITSURU , UCHIHARA MASATO , TAIYAMA MASANORI , IMAI NORIO , TOMITA TOSHIRO , FUKUSHIMA MASAHIRO , KONO YOSHIORI , WAKITA MASAYUKI , TOKI TAMOTSU , OGAWA KAZUHIRO
IPC分类号： C22C38/00 , B21B3/00 , C21D9/46 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet suitable for automobiles or the like, and having a wide proper current range, and to provide a spot-welded member.
SOLUTION: The hot rolled steel sheet is made of a carbon steel or a low alloy steel containing ferrite as the main phase, and having a C content of ≤0.15 mass%, and in which the average crystal grain diameter D (μm) of the ferrite in the depth of the 1/4 of the sheet thickness from the surface of the steel sheet satisfies the following inequalities (1) and (2), further, the increasing speed X (μm/min) at 700°C in the average crystal grain diameter of the ferrite in the depth position of the 1/4 of the sheet thickness from the surface of the steel sheet, and the average crystal grain diameter D (μm) satisfy the following inequality (3), and also, tensile strength TS (MPa) satisfies the following inequality (4): inequality (1) 1.2≤D≤7; inequality (2) D≤2.7+5000/(5+350*C+40*Mn)
2 ; inequality (3) D*X≤0.1; and inequality (4) TS(TS/170-1)/1000≥Si+Al+Mn.
COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供适用于汽车等的热轧钢板，并具有适当的电流范围，并提供点焊部件。解决方案：热轧钢板由碳钢或含有铁素体作为主相的低合金钢制成，C含量≤0.15质量％，平均晶粒直径D（μm ）从钢板表面的1/4厚度的铁素体满足以下不等式（1）和（2），此外，在700℃下的增加速度X（μm/ min）在钢板表面的1/4厚度的深度位置的铁素体的平均晶粒直径和平均晶粒直径D（μm）满足以下不等式（3），并且，拉伸强度TS（MPa）满足以下不等式（4）：不等式（1）1.2≤D≤7; 不等式（2）D≤2.7+ 5000 /（5 + 350 * C + 40 * Mn） 2 不等式（3）D *X≤0.1; 和不等式（4）TS（TS / 170-1）/1000≥Si+ Al + Mn。版权所有（C）2008，JPO＆INPIT

5. 发明专利

JP2008189958A Hot rolled steel sheet with uniform and fine ferritic structure, and its manufacturing method 审中-公开
标题翻译：具有均匀和精细结构的热轧钢板及其制造方法
公开(公告)号：JP2008189958A
公开(公告)日：2008-08-21
申请号：JP2007023697
申请日：2007-02-02
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： FUKUSHIMA MASAHIRO , ETO MANABU , SASAKI TAMOTSU , KONO YOSHIORI , WAKITA MASAYUKI
IPC分类号： C22C38/00 , C21D9/46 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a hot rolled steel sheet by which deformability or uniform deformability at secondary working can be improved.
SOLUTION: The hot rolled steel sheet is composed mainly of ferrite phase and has a composition consisting of, by mass, 0.04 to 0.20% C, 0.01 to 2.0% Si, 0.5 to 3.0% Mn and the balance Fe with inevitable impurities and is characterized as follows: a ferrite grain size in a position at a depth one-fourth the sheet thickness from the surface of the steel sheet, D2, is
摘要翻译：要解决的问题：提供一种能够提高二次加工时的变形性或均匀变形性的热轧钢板。解决方案：热轧钢板主要由铁素体相组成，其组成为：质量为0.04〜0.20％，Si：0.01〜2.0％，Mn：0.5〜3.0％，余量为不可避免的杂质其特征如下：在距离钢板表面的四分之一厚度的位置处的铁素体晶粒尺寸为D2，<2.0μm; 从钢板表面的深度为板厚的一半的位置处的铁素体晶粒尺寸与D3相对于钢板表面的距离为50μm的位置的铁素体晶粒尺寸之间的关系，D1，满足（D3-D1）/D2≤0.4; 在钢板表面的深度为50μm的位置的铁素体晶粒的轧制方向的粒径Dr和板厚方向的粒径Dt满足不等式¾（Dr-Dt ）/（（DR + DT）/ 2）¾≤0.25。版权所有（C）2008，JPO＆INPIT

6. 发明专利

JP2007046128A Method for manufacturing hot-rolled steel sheet having fine ferrite structure 审中-公开
标题翻译：用于制造具有精细铁素体结构的热轧钢板的方法
公开(公告)号：JP2007046128A
公开(公告)日：2007-02-22
申请号：JP2005233427
申请日：2005-08-11
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： FUKUSHIMA MASAHIRO , ETO MANABU , SASAKI TAMOTSU , KONO YOSHIORI , WAKITA MASAYUKI
IPC分类号： C21D8/02 , B21B1/26 , B21B3/00 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a hot-rolled steel sheet formed of finer crystal grains than before, specifically, formed of ferritic crystal grains with sizes of less than 2 μm on average.
SOLUTION: A base steel plate for the hot-rolled steel sheet comprises, by mass%, 0.04-0.20% C, 0.01-2.0% Si, 0.5-3.0% Mn and the balance Fe with unavoidable impurities. The manufacturing method comprises: a step (A) of subjecting the base steel plate to such thermomechanical treatment as to include reverse-transformation from a martensite-containing phase to an austenite single-phase so that the base steel plate can be formed of the austenite single-phase and can consist of crystal grains with an average particle diameter of 30 μm or smaller; a step (B) which includes the subsequent first rolling step of rolling the base steel plate once with a rolling reduction of 30 to 55% at an Ae3 transformation temperature or higher at an inlet side of a rolling mill; a step (C) which includes the subsequent second rolling step of rolling the above rolled sheet once with a rolling reduction of 35 to 60% in a temperature range between (Ae3 transformation temperature -60°C) and (Ae3 transformation temperature +20°C) at an inlet side of a rolling mill; and a step (D) of subsequently cooling the above rolled sheet to a temperature of (Ae3 transformation temperature -130°C) or lower at a cooling rate of 600°C/sec or higher, within 0.2 seconds after having finished the second rolling step.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：解决的问题：提供一种由比以前更细的晶粒形成的热轧钢板的制造方法，特别是由平均尺寸小于2μm的铁素体晶粒形成。解决方案：用于热轧钢板的基础钢板以质量％计含有0.04-0.20％的C，0.01-2.0％的Si，0.5-3.0％的Mn，余量的Fe是不可避免的杂质。制造方法包括：对基体钢板进行这样的热机械处理的步骤（A），包括从含马氏体相到奥氏体单相的反向相变，使得基体钢板可以由奥氏体单相，可以由平均粒径为30μm以下的晶粒构成，步骤（B），其包括在轧机入口侧的Ae3相变温度以上的轧制压下率为30〜55％的基础钢板一次轧制的第一轧制工序; 在（Ae3转变温度-60℃）和（Ae3转变温度-60℃）之间的温度范围内以35〜60％的压下率轧制上述轧制板一次的工序（C） C）在轧机的入口侧; 以及在完成第二次轧制后的0.2秒内随后将上述轧制板冷却至（Ae3相变温度-130℃）或更低的温度（600℃/秒以上）的步骤（D）步。版权所有（C）2007，JPO＆INPIT

7. 发明专利

JP2008231474A Hot-rolled steel plate and manufacturing method therefor 有权
标题翻译：热轧钢板及其制造方法
公开(公告)号：JP2008231474A
公开(公告)日：2008-10-02
申请号：JP2007069965
申请日：2007-03-19
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： KONO YOSHIORI , WAKITA MASAYUKI , FUKUSHIMA MASAHIRO , ETO MANABU , SASAKI TAMOTSU
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a high-strength hot-rolled steel plate having both of high strength and high toughness, which can realize a high tensile strength exceeding 580 MPa without rolling a plate with a high reduction rate at a low-temperature region, has toughnesses, particularly, large upper shelf energy among them, and is superior in fracture toughness as well. SOLUTION: The hot-rolled steel plate contains ferrite as the main phase, which has an average grain size of less than 1.00 μm in a position of 100 μm deep from the surface of the steel plate, and contains dislocations of 7×10 12 /m 2 or less by mean density in the above position. Alternatively or furthermore, the hot-rolled steel plate contains the crystal grains of ferrite surrounded by high angle grain boundaries or clusters of the crystal grains, which have an average aspect ratio of 2.0 or less in the above position. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：为了提供具有高强度和高韧性两者的高强度热轧钢板，其可以实现超过580MPa的高拉伸强度，而不会以低的速度滚动板具有韧性，特别是其中较高的上架能量，并且断裂韧性也优异。
解决方案：热轧钢板含有铁素体作为主相，平均粒径小于1.00μm，距离钢板表面100μm深，位错为7× 10 12 / m 2 以上的位置的平均密度。或者或另外，热轧钢板包含由高角度晶界包围的铁氧体的晶粒或晶粒的簇，其在上述位置具有2.0以下的平均纵横比。版权所有（C）2009，JPO＆INPIT

8. 发明专利

JP2007038279A Manufacturing method of hot-rolled steel plate having fine ferrite structure 有权
标题翻译：具有微细结构的热轧钢板的制造方法
公开(公告)号：JP2007038279A
公开(公告)日：2007-02-15
申请号：JP2005227158
申请日：2005-08-04
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： FUKUSHIMA MASAHIRO , ETO MANABU , SASAKI TAMOTSU , KONO YOSHIORI , WAKITA MASAYUKI
IPC分类号： B21B3/00 , B21B1/26 , B21B45/02 , C21D9/46 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method for realizing finer grain size, and more specifically, for realizing the ferrite grain size below 2 μm in average.
SOLUTION: The manufacturing method comprises: a step A including the first rolling of rolling a stock steel plate having the composition consisting of, by mass, C of 0.04-0.20%, Si of 0.01-2.0%, and Mn of 0.5-3.0%, and the balance Fe with inevitable impurities at the total draft of ≥ 80% in the temperature zone of not lower than Ae3 transformation point; a Step B containing the second rolling of performing the one-pass rolling at the draft of 30-55% in the temperature zone in which the temperature on the rolling mill inlet side is not lower than the Ae3 transformation point continuous to the step A, a step C including the third rolling of performing the one-pass rolling at the draft of 35-60% in the temperature zone in which the temperature on the rolling mill inlet side is a predetermined value after the step B, and a step D of continuously cooling the steel plate to the temperature not higher than (Ae3 transformation point -130°C) at the cooling rate of 600°C/sec. within 0.2 sec.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于实现更细粒度的制造方法，更具体地说，用于实现平均小于2μm的铁素体晶粒尺寸。解决方案：制造方法包括：步骤A，其包括轧制具有由质量为0.04-0.20％的C，0.01-2.0％的Si和0.5为0.5的组成的钢板的第一次轧制 -3.0％，平均Fe与不可避免的杂质总温度在80％以上，温度区不低于Ae3相变点; 在轧制机入口侧的温度不低于与步骤A连续的Ae3相变点的温度区域中，含有进行一次轧制的第二次轧制的工序B为30-55％包括在步骤B之后的轧机入口侧的温度为规定值的温度区域中以35〜60％的压下量进行一次轧制的第三轧制的工序C，以600℃/秒的冷却速度将钢板连续冷却至不高于（Ae3相变点-130℃）的温度。在0.2秒内版权所有（C）2007，JPO＆INPIT

9. 发明专利

JP2004291013A Method for producing thick steel plate 有权
标题翻译：生产厚钢板的方法
公开(公告)号：JP2004291013A
公开(公告)日：2004-10-21
申请号：JP2003086074
申请日：2003-03-26
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： YAZAWA TAKEO , FUKUSHIMA MASAHIRO , ICHIYANAGI YASUMASA , OZEKAWA ATSUSHI
IPC分类号： B21B1/38 , B21C51/00
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a thick steel plate, in which generation of double-bulging is restrained for every thick plate that is rolled in an actual rolling-process. SOLUTION: The method for producing the thick steel plate comprises applying, to a material 2 to be rolled, the rolling-reduction that uses a horizontal roll and a vertical roll. In the method, the overlap amounts d 1 , d 2 at both end parts of the material 2 to be rolled are determined before applying the rolling-reduction using the vertical roll, and the total reduction amount in the rolling reduction using the vertical roll is made to be (d 1 + d 2 )×(1+ C). COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：解决的问题：提供一种用于生产厚钢板的方法，其中对于在实际轧制过程中轧制的每个厚板来说，抑制了双重膨胀的产生。解决方案：用于生产厚钢板的方法包括将待轧材料2应用于使用水平辊和垂直辊的轧制压下。在该方法中，在使用垂直辊进行轧制还原之前，确定待轧制材料2的两个端部处的重叠量d 1 ，d 2 并且使用垂直辊的轧制压下量的总减少量为（d 1 + d 2 ）×（1+ C）。版权所有（C）2005，JPO＆NCIPI

10. 发明专利

JP2004143503A Method for producing hot rolled steel sheet 有权
标题翻译：生产热轧钢板的方法
公开(公告)号：JP2004143503A
公开(公告)日：2004-05-20
申请号：JP2002308327
申请日：2002-10-23
申请人： Sumitomo Metal Ind Ltd , 住友金属工業株式会社
发明人： FUKUSHIMA MASAHIRO , ETO MANABU
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a hot rolled steel sheet as a plating base material for producing a hot dip galvannealed steel sheet which has sufficient plating adhesion even without increasing an alloying treatment temperature or increasing an alloying treatment time because of its sufficient alloying treatability. SOLUTION: A slab having a steel composition comprising 0.04 to 0.2% C, 0.05 to 2.0% Si, 0.1 to 3.0% Mn, ≤0.10% P, ≤0.02% S and 0.005 to 1.5% sol.Al is hot-rolled, and is thereafter cooled. In this case, the finish rolling temperature in hot finish rolling is controlled to the temperature range of the Ae 3 point to (the Ae 3 point+100)°C. Further, within 0.4 sec after the completion of the rolling, the first cooling is performed in such a manner that the temperature of the surface part satisfies (the Ae 3 point-200) to (the Ae 3 point-50)°C. Within 1.0 sec after that, the second cooling is performed to ≤600°C at a cooling rate of ≥70°C/s, so that the hot rolled steel sheet in which the ferrite crystal grain size in the surface is ≤2.5 μm on the average is produced. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种制造热轧钢板的方法，该热轧钢板作为用于制造热浸镀锌钢板的电镀基材，其即使不增加合金化处理温度或增加合金化处理时间也具有足够的电镀附着力因为其具有足够的合金化处理性。解决方案：具有包含0.04至0.2％C，0.05至2.0％Si，0.1至3.0％Mn，≤0.10％P，≤0.02％S和0.005至1.5％溶胶的钢组成的板坯，然后冷却。在这种情况下，将热精轧中的精轧温度控制在Ae 3 点（Ae 3 点+ 100）℃的温度范围。此外，在轧制完成后的0.4秒内，首先进行冷却，使得表面部分的温度满足（Ae 3 点-200）〜（Ae 3 点-50）℃。 1.0秒后，以≥70℃/ s的冷却速度进行第二次冷却至≤600℃，使表面的铁素体晶粒尺寸为2.5μm以下的热轧钢板平均产量。版权所有（C）2004，JPO

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式