公开(公告)号：JP2013170305A

公开(公告)日：2013-09-02

申请号：JP2012036154

申请日：2012-02-22

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ISHIGURO YASUHIDE ,  ARAYA MASATOSHI ,  SATO AKIO

IPC: C23C22/73 ,  C21D7/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/58 ,  C23C22/07

Abstract: PROBLEM TO BE SOLVED: To provide a simple method for determining chemical conversion treatability of steel, and a method for producing steel excellent in chemical conversion treatability utilizing the same.SOLUTION: Target steel is immersed in a chemical solution (chemical conversion treatment solution), and the immersing potential of the steel is continuously measured from the start of immersion to measure the time required for the immersing potential of the steel to be the same as the natural immersing potential in the chemical solution. The obtained time is compared with the appropriate treatment time determined for performing the chemical conversion treatment of steel using a chemical solution (chemical conversion treatment solution) to be used, and when the obtained time is 2/3 or less of the appropriate treatment time, the steel is determined to be steel excellent in chemical conversion treatability. Further, when the method for determining the chemical conversion treatability of steel is used to determine the chemical conversion treatability of target steel, and the steel is determined to be steel poor in chemical conversion treatability, improvement treatment of the chemical conversion treatability is performed to form steel excellent in chemical conversion treatability. A preferred improvement treatment of chemical conversion treatability includes the treatment of applying cold rolling, a shot blast, pickling, polishing/grinding, and the like.

Abstract translation: 要解决的问题：提供一种用于确定钢的化学转化处理性的简单方法，以及利用该钢的化学转化处理性优异的钢的生产方法。溶液：将目标钢浸入化学溶液（化学转化处理溶液）中， 并且从浸渍开始连续地测量钢的浸渍电位，以测量钢的浸渍电位与化学溶液中的天然浸渍电位相同所需的时间。 将获得的时间与使用要使用的化学溶液（化学转化处理溶液）进行钢的化学转化处理所确定的适当的处理时间进行比较，并且当获得的时间为适当处理时间的2/3以下时， 钢被确定为具有优异的化学转化处理性的钢。 此外，当使用用于确定钢的化学转化处理性的方法来确定目标钢的化学转化处理性，并且钢被确定为钢在化学转化处理性方面较差时，进行化学转化处理性的改进处理以形成 钢优良的化学转​​化处理性。 化学转化处理性的优选改进处理包括冷轧，喷丸，酸洗，抛光/研磨等的处理。

公开(公告)号：JP2010158689A

公开(公告)日：2010-07-22

申请号：JP2009001267

申请日：2009-01-07

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： HASHIMOTO YUJI ,  SONOBE OSAMU ,  SUZUKI KOJI ,  SATO AKIO

IPC: B21D26/02 ,  B21D26/033 ,  B21D26/035

Abstract: PROBLEM TO BE SOLVED: To provide a forming method which does not need prepress even when the width of a horseshoe-shaped cross section of a product is smaller than the outside diameter of a pipe stock.
SOLUTION: In the method for making a tube with special cross-sectional shape having the horseshoe-shaped cross section by putting a part of a workpiece 10 taking a round pipe as a pipe stock 1 between a projecting die 4 and a recessed die 3 and crushing it with them, the recessed die is divided into two and has variable width structure. After the workpiece is pressed into a smaller width than the outside diameter of the pipe stock with the recessed die which is divided into two and has the variable width structure, hydraulic pressure is applied into the body of the workpiece and the workpiece is formed into the horseshoe-shaped cross sectional shape by pushing into the projection die in that state.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：即使当产品的马蹄形截面的宽度小于管材的外径时，也提供不需要印前的成形方法。 解决方案：在用于制造具有马蹄形横截面的具有特殊横截面形状的管的方法中，通过将一部分工件10以圆管作为管坯1放置在突出模具4和凹入部分 模具3并与它们一起粉碎，凹模被分为两部分，具有可变的宽度结构。 在将工件压入比管材外径小的宽度的情况下，将具有可变宽度结构的凹形模具分成两部分并且具有可变宽度结构，将液压施加到工件的主体中，并且将工件形成为 在该状态下通过推入投影模具中的马蹄形横截面形状。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010111931A

公开(公告)日：2010-05-20

申请号：JP2008286940

申请日：2008-11-07

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ARAYA MASATOSHI ,  TOYODA SHUNSUKE ,  KAWABATA YOSHIKAZU ,  SAKATA TAKASHI ,  SATO AKIO ,  SAITO OSAMU ,  GUNJI MAKIO

IPC: C22C38/00 ,  C21D8/10 ,  C22C38/38 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a high-tensile welded steel pipe for automobile members having high strength and excellent workability and low-temperature toughness as well, and excellent resistance of softening of weld-heat affected zone. SOLUTION: The method for producing a high-tensile welded steel pipe comprises heating a welded steel pipe, as a base material, to its A c3 transformation temperature or higher wherein the welded steel pipe has a composition containing, by mass%, 0.02-0.15%C, 0.01-0.5%Si, 1.5-4.0%Mn, 0.1% or less P, 0.01% or less S, 0.01-0.1%Al, 0.0005-0.0030%B, over 0.04-0.1%Nb, 0.11-1.0%Cr, 0.01-0.5%Mo, 0.001-0.1%Ti, and 0.01% or less N, and then subjecting it to diameter reduction rolling at a cumulative diameter reduction ratio of 25-75% in a temperature range in which roll finish temperature is 700-900°C. Intermediate heat treatment may be performed during the diameter reduction rolling. By this way, the welded steel pipe is made into a steel pipe having a structure comprising a bainite phase or a bainitic ferrite phase or a structure in which the main phase is a bainite phase or a bainitic ferrite phase and the second phase is a martensite phase with an areal ratio of 15% or less, and also made into a steel pipe having a high tensile strength TS of 780 MPa or more, a high toughness having Trs 50 of -40°C or less, and excellent formability having an elongation El of 10% or more, a small decrease in hardness of a weld-heat affected zone, and excellent resistance to softening of a weld-heat affected zone. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了提供高强度，优异的加工性和低温韧性的汽车构件的高强度焊接钢管，以及焊接热影响区域的优异的软化性。 解决方案：用于制造高强度焊接钢管的方法包括将作为基材的焊接钢管加热至其A 3 SB 3相变温度以上，其中焊接钢管具有 以质量％计含有0.02-0.15％C，0.01-0.5％Si，1.5-4.0％Mn，0.1％以下P，0.01％以下S，0.01-0.1％Al，0.0005-0.0030％B，超过 0.04-0.1％Nb，0.11-1.0％Cr，0.01-0.5％Mo，0.001-0.1％Ti和0.01％以下的N，然后以25-75％的累积直径减小率进行直径还原轧制， 在轧制完成温度为700-900℃的温度范围内。 可以在直径缩小轧制期间进行中间热处理。 通过这种方式，焊接钢管被制成具有贝氏体相或贝氏体相的结构的钢管或主相为贝氏体相或贝氏体相的结构，第二相为马氏体 相，其面积率为15％以下，并且还制成具有780MPa以上的高抗张强度TS的钢管，具有-40℃以下的Trs 50 的高韧性 ，并且具有10％以上的伸长率E1，焊接热影响区域的硬度的小的降低以及焊接热影响区域的优异的软化性优异的成形性。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2013173340A

公开(公告)日：2013-09-05

申请号：JP2012125764

申请日：2012-06-01

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： MIYATA SHIRO ,  HARADA YASUHIRO ,  SATO AKIO ,  URAHATA EIICHI

IPC: B32B15/085 ,  B05D7/22 ,  B05D7/24 ,  B32B1/08 ,  F16L58/10

Abstract: PROBLEM TO BE SOLVED: To provide a technique to decrease a generation amount of thermal decomposition products that causes troubles such as blocking of filters and valves or the like of a gas pipe (for instance, gas conduit pipe) generated from the part of internal coating in the welding joining, and to solve the trouble.SOLUTION: There is provided a polyethylene-coated steel pipe that has a coating layer of polyethylene resin in an outer surface, and in the polyethylene-coated steel pipe, the inner surface has the coating film, and the coating film is a cured coating film of the coating that contains the alkyl silicate of 80 pts.wt. or more and 95 pts.wt. or less based on the coating solid content 100 pts.wt. Alternatively, the coating film is the cured coating film of the coating that contains the alkyl silicate of 5 pts.wt. or more and the metal powder of 30 pts.wt. or more having sacrificial protection action based on the coating solid content of 100 pts.wt.

Abstract translation: 要解决的问题：提供一种减少由内部涂层的一部分产生的气体管（例如气体导管）的过滤器和阀等堵塞等热分解产物的产生量的技术 在焊接中，解决问题。解决方案：提供一种聚乙烯涂层钢管，其外表面具有聚乙烯树脂涂层，在聚乙烯涂层钢管中，内表面具有涂层 膜，并且涂膜是包含80重量份的烷基硅酸盐的涂层的固化涂膜。 或更多和95 pts.wt 或更低，基于涂层固含量为100重量份 或者，涂膜是包含5重量份烷基硅酸盐的涂层的固化涂膜。 以上，30重量份的金属粉末 或更多具有基于涂层固体含量为100重量份的牺牲保护作用。

公开(公告)号：JP2011038154A

公开(公告)日：2011-02-24

申请号：JP2009187206

申请日：2009-08-12

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： TOYODA SHUNSUKE ,  HASHIMOTO YUJI ,  KAWABATA YOSHIKAZU ,  SATO AKIO ,  YORIFUJI AKIRA ,  GUNJI MAKIO

IPC: C22C38/00 ,  B21B3/00 ,  B21C37/08 ,  C21D9/46 ,  C22C38/14 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a high tension steel which is suitable for automobile structural member and has high strength, excellent formability and excellent torsional fatigue resistance after cross-sectional forming in combination, and a manufacturing method therefor.
SOLUTION: A steel stock having the composition containing, by mass, 0.03-0.24% C, 0.021-0.044% V and further, Nb and/or Ti, is subjected to hot-rolling at higher temperature than a balanced solid-solution temperature T
v calculated from log[V][C]=-9500/T
v +6.72 (wherein, V, C are contents (mass%) of each element) to form the high tension hot-rolled steel sheet for automobile undercarriage component excellent in the formability and the torsional fatigue resistance, and further, this steel sheet is used as the stock for steel pipe, and a welded steel pipe is made through a pipe-making and welding processes.
COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供一种适用于汽车结构件的高强度钢，并且具有高强度，优异的成形性和横截面成形后的优异的抗扭转疲劳性及其制造方法。 解决方案：将含有质量为0.03-0.24％C，0.021-0.044％V，进一步含有Nb和/或Ti的组成的钢坯在比平衡的固体成分高的温度下进行热轧， 由log [V] [C] = -9500 / T +6.72计算的溶液温度T v （其中，V，C为各元素的含量（质量％） ），形成成形性和抗扭转疲劳性优异的汽车起落架用高张力热轧钢板，进而将该钢板作为钢管的原料使用，并且通过管道制造焊接钢管 制造和焊接工艺。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：JP2010090441A

公开(公告)日：2010-04-22

申请号：JP2008262040

申请日：2008-10-08

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ISHIGURO YASUHIDE ,  SATO AKIO

IPC: C23C28/00 ,  C22C38/00 ,  C22C38/04 ,  C22C38/58 ,  C25D5/26 ,  C25D5/36 ,  C25D5/48

Abstract: PROBLEM TO BE SOLVED: To provide a steel material superior in the chemical-conversion treatability of a worked member, and to provide a method for manufacturing the same.
SOLUTION: The steel material preferably includes, by mass%, 0.05% or more C, more than 0.7% Si and 0.8% or more Mn. The manufacturing method includes plating the surface of the steel material with a metal of such a slight plating deposition amount as 10 mg/m
2 or less. Thus, manufactured steel material does not cause the lowering of the chemical conversion treatability even when the steel material contains more than 0.7% Si, and can prevent the lowering of the chemical conversion treatability due to working, even when the steel material has been subjected to such working as to exceed 2% by a surface distortion. The metal to be plated is preferably Ni, Cu and Mo. The layer plated with the metal of the slight amount is discontinuously formed so as to partially cover the base steel material, and functions as a cationic point when chemical-conversion crystals deposit on the steel material. Accordingly, dense and fine chemical-conversion crystals can be formed thereon.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种在加工构件的化学转化处理性方面优异的钢材，并提供其制造方法。 钢材优选以质量％计含有0.05％以上的C，大于0.7％的Si和0.8％以上的Mn。 制造方法包括用等于或小于10毫克/米2（SP）2以下的微小电镀沉积量的金属镀覆钢材表面。 因此，即使当钢材含有大于0.7％的Si时，制造的钢材也不会导致化学转化处理性的降低，并且即使当钢材已经被接受时，也可以防止由于加工而导致的化学转化处理性降低 这样通过表面失真超过2％。 要镀覆的金属优选为Ni，Cu和Mo。镀有少量金属的层被不连续地形成以部分覆盖基材，并且当化学转化晶体沉积在 钢材。 因此，可以在其上形成致密和精细的化学转化晶体。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010090440A

公开(公告)日：2010-04-22

申请号：JP2008262029

申请日：2008-10-08

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ISHIGURO YASUHIDE ,  SATO AKIO ,  IKEDA TOMOMASA

IPC: C22C38/00 ,  B23K11/11 ,  B23K103/04 ,  C22C38/04 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a lap one side spot welding method using a high-strength steel(s) which has high joining strength and suppresses generation of a burn and severe electrode wear. SOLUTION: When a high-strength steel and a soft steel or high-strength steels are lapped, and are welded and joined by one side spot welding using at least two electrodes separated by ≥50 mm, respectively, the high-strength steel(s) is used which has a composition containing, by mass, 0.7 to 2.5% Si and 0.8 to 3% Mn. In this way, a nugget is formed at the boundary between the lapped steel sheets, and a one side spot-welded and joined member having high joining strength is obtained. Further, in indirect type one side spot welding, either electrode to form into the welding side electrode is arranged by one piece at either (soft steel) side of the lapped materials to be welded, and the other electrodes to form into the earth side electrodes are arranged by at least two pieces at the other (high strength steel) side of the materials to be welded. Thus, high joining strength is secured, and further, a burn generated at the steel (high strength steel) arranged with the earth side electrodes, severe electrode wear or the like is suppressed. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种使用具有高接合强度并抑制燃烧产生和严重电极磨损的高强度钢的搭接一侧点焊方法。 解决方案：当高强度钢和软钢或高强度钢被研磨时，分别使用至少两个分别为≥50mm的电极通过一侧点焊焊接并接合，高强度 使用具有质量为0.7〜2.5％的Si和0.8〜3％Mn的组成的组成的钢。 以这种方式，在重叠的钢板之间的边界处形成熔核，并获得具有高接合强度的单面点焊接合部件。 此外，在间接式单面点焊中，形成焊接侧电极的电极在被焊接的被覆盖材料的（软质）一侧配置成一体，其他电极形成为接地侧电极 在待焊接材料的另一（高强度钢）侧上至少布置两块。 因此，确保了高的接合强度，并且抑制了在配置有接地侧电极的钢（高强度钢）上产生的燃烧，严重的电极磨损等。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010089128A

公开(公告)日：2010-04-22

申请号：JP2008262058

申请日：2008-10-08

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ISHIGURO YASUHIDE ,  SATO AKIO

IPC: B21D1/05 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing a high-workability high-strength thin steel sheet excellent in a chemical conversion property. SOLUTION: A working process is applied to the thin steel sheet containing ≥0.05 mass% C, >0.7 mass% Si and ≥0.8 mass% Mn, wherein working amount is adjusted such that sum of absolute values of surface strains imparted to the surface layer of the thin steel sheet to be 5% or more in a nominal strain. Accordingly, even the thin steel sheet containing >0.7 mass% Si is formed into a thin steel sheet having a good chemical conversion property without carrying out mechanical grinding, chemical pickling processing or the like. The working process includes preferably a process for continuously repeating a plurality of bending-bending back operations using a plurality of rolls and/or a process for applying cold rolling. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种制造化学转化性优异的高加工性高强度薄钢板的方法。 解决方案：对含有≥0.05质量％C，> 0.7质量％Si和≥0.8质量％Mn的薄钢板应用工作方法，其中调整工作量，使得赋予表面菌株的绝对值之和 薄钢板的表层在标称应变下为5％以上。 因此，即使是含有> 0.7质量％Si的薄钢板也可以形成为具有良好的化学转化性能的薄钢板，而不进行机械磨削，化学浸渍加工等。 工作方法优选包括使用多个辊连续重复多次弯曲弯曲操作的方法和/或用于冷轧的方法。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010037612A

公开(公告)日：2010-02-18

申请号：JP2008203035

申请日：2008-08-06

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： ISHIGURO YASUHIDE ,  KAWABATA YOSHIKAZU ,  TOYODA SHUNSUKE ,  SONOBE OSAMU ,  SATO AKIO

IPC: C22C38/00 ,  B21C37/08 ,  C21D9/08 ,  C21D9/50 ,  C22C38/06 ,  C22C38/16

Abstract: PROBLEM TO BE SOLVED: To provide a high-strength steel pipe having a seam portion and excellent in workability. SOLUTION: The high-strength steel pipe has a composition containing, by mass, 0.05-0.25% C, 0.5-2.0% Si, 1.0-2.5% Mn, ≤0.020% P, ≤0.002% S, 0.005-0.08% Al and ≤0.004% N. The structure of the region except a range of ±15° in the circumferential direction based on the center position of the seam is a structure containing 20-60% by area of a martensitic phase, the region except the range has a tensile residual stress of ≤450 MPa in the circumferential direction, and the hardness difference ΔHV between the region and the remaining region is ≤250 points by Vickers hardness. The steel pipe is preferably obtained by using a steel sheet having a structure containing a predetermined range of martensite as blank, and adopting a manufacturing process including a roll forming step in which little work strain is applied to the blank and a seam annealing step. A roll forming method by a cage roll system or a roll forming method in which a formed flower is made oval may be used in the roll forming step in which little work strain is applied to the blank. Accordingly, the high-strength steel pipe has such high strength as a tensile strength of ≥590 MPa, has a high elongation value suitable for the high strength, and is excellent in workability. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供一种具有接缝部分并且加工性优异的高强度钢管。 解决方案：高强度钢管具有以质量计含有0.05-0.25％C，0.5-2.0％Si，1.0-2.5％Mn，≤0.020％P，≤0.002％S，0.005-0.08 ％Al和≤0.004％N。基于接缝的中心位置，在圆周方向上除了±15°范围之外的区域的结构是包含马氏体相的20-60％的面积的结构，除了 该范围在圆周方向上的拉伸残余应力为≤450MPa，通过维氏硬度，该区域与剩余区域之间的硬度差ΔHV为≤250点。 钢管优选通过使用具有包含预定范围的马氏体的结构的钢板作为空白，并且采用包括其中对坯料施加很小的工作应变和接缝退火步骤的辊成形步骤的制造工艺来获得。 通过笼式辊系统的辊成型方法或其中成形花形成椭圆形的辊成型方法可以用于对坯料施加很小的工作应变的辊成形步骤中。 因此，高强度钢管的拉伸强度≥590MPa的强度高，具有适用于高强度的高伸长率，加工性优异。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010240656A

公开(公告)日：2010-10-28

申请号：JP2009088910

申请日：2009-04-01

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： HASHIMOTO YUJI ,  SONOBE OSAMU ,  SUZUKI KOJI ,  SATO AKIO

IPC: B21D53/88 ,  B60G9/04

CPC classification number: B60G21/051 ,  B60G2206/20 ,  B60G2206/80

Abstract: PROBLEM TO BE SOLVED: To provide a means for improving fatigue strength of an ear part which is a fatigue-crack generation dangerous portion of a torsion beam without almost causing disadvantages of productivity and cost.
SOLUTION: When a pipe body 1 is molded into a torsion beam, a part of the pipe body is crushed in a diameter direction to mold the pipe body having a substantially U-shaped cross section, and then plastic deformation is imparted by twisting-twisting restoration 3.
COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供一种用于提高作为扭力梁的疲劳裂纹发生危险部分的耳部的疲劳强度的装置，而几乎不产生生产率和成本的缺点。 解决方案：当管体1被模制成扭转梁时，管体的一部分在直径方向被压扁，以模制具有大致U形截面的管体，然后塑性变形由 扭曲修复3.版权所有（C）2011，JPO＆INPIT