公开(公告)号：JP2010090442A

公开(公告)日：2010-04-22

申请号：JP2008262062

申请日：2008-10-08

Applicant: Honda Motor Co Ltd ,  Jfe Steel Corp ,  Jfeスチール株式会社 ,  本田技研工業株式会社

Inventor： ISHIGURO YASUHIDE ,  SATO AKIO ,  SHIMIZU YASUHISA

IPC: C22C38/00 ,  B21C37/08 ,  C21D8/10 ,  C22C38/06 ,  C22C38/58

CPC classification number: B21C37/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/38

Abstract: PROBLEM TO BE SOLVED: To provide a high workability and high strength steel pipe having excellent chemical treatment property, and to provide a method for producing the same.
SOLUTION: When a steel plate comprising, by mass, ≥0.05% C, >0.7% Si and ≥0.8% Mn is used as a mother plate, and is worked into a pipe shape, the total of the absolute values of surface strain in the circumferential direction respectively applied in each step of the working is controlled to ≥5% by nominal strain. In this way, even if a welded steel pipe is produced using a steel plate comprising >0.7% Si, the steel pipe having satisfactory chemical treatment property is obtained without performing mechanical grinding, chemical pickling treatment or the like.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供具有优异的化学处理性能的高加工性和高强度钢管，并提供其制造方法。 解决方案：当使用质量分数为≥0.05％C，> 0.7％Si和≥0.8％Mn的钢板作为母板时，加工成管状， 在工作的每个步骤中分别施加的圆周方向的表面应变通过标称应变被控制为≥5％。 以这种方式，即使使用含有> 0.7％Si的钢板制造焊接钢管，也可以在不进行机械磨削，化学酸洗处理等的情况下获得具有令人满意的化学处理性能的钢管。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010089127A

公开(公告)日：2010-04-22

申请号：JP2008262054

申请日：2008-10-08

Applicant: Honda Motor Co Ltd ,  Jfe Steel Corp ,  Jfeスチール株式会社 ,  本田技研工業株式会社

Inventor： ISHIGURO YASUHIDE ,  SATO AKIO ,  SHIMIZU YASUHISA

IPC: B21D1/00 ,  B21C37/08 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58

CPC classification number: C23C22/78 ,  B21C37/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/38

Abstract: PROBLEM TO BE SOLVED: To provide a working method of a high-strength member having a higher Si-content than 0.7 mass%.
SOLUTION: Working process is applied to a high-strength steel material containing ≥0.05 mass% C, >0.7 mass% Si and ≥0.8 mass% Mn, to form a member with a predetermined shape, wherein working amount is adjusted such that sum of absolute values of surface strains in a predetermined direction respectively imparted in each process of working is 5% or more in a nominal strain. Even when Si is contained in an amount of >0.7 mass%, the member is made to have a remarkably improved chemical conversion property without specifically carrying out mechanical grinding, chemical pickling processing or the like.
COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供具有比0.7质量％高的Si含量的高强度部件的加工方法。 解决方案：将工作过程应用于含有≥0.05质量％C，> 0.7质量％Si和≥0.8质量％Mn的高强度钢材，以形成具有预定形状的构件，其中将工作量调整为 在每个工作过程中分别赋予的预定方向上的表面应变的绝对值之和在标称应变中为5％以上。 即使在Si含量为> 0.7质量％的情况下，也可以在不特别进行机械研磨，酸洗处理等的情况下使化学转化性显着提高。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2009293066A

公开(公告)日：2009-12-17

申请号：JP2008146087

申请日：2008-06-03

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

Inventor： TOYODA SHUNSUKE ,  JODAI TETSUSHI ,  YAMASHITA TAKAKO ,  HASHIMOTO YUJI ,  KAWABATA YOSHIKAZU ,  SATO AKIO

IPC: C22C38/00 ,  C21D8/10 ,  C21D9/46 ,  C22C38/12 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a high-tensile-strength steel material which is suitable for an automotive structure member and is superior in low-temperature toughness, formability, and fatigue resistance after the cross section has been worked, and to provide a manufacturing method therefor. SOLUTION: This manufacturing method includes imparting such a heat history or a thermal working history that a cumulative heat-treatment parameter ΣAi which is defined by the expression: ΣAi=ΣäTi×(20+log ti)} (wherein ti represents heat-treatment period of time (h) in i-th step; and Ti represents heat-treatment temperature (K) in the i-th step) satisfies 30,000 to 20,000 in a temperature range of 850 to 1,150°C and 20,000 to 13,000 in a temperature range of 500 to 700°C, to a base material containing 0.03 to 0.24% C and at least 0.001 to 0.15% Nb. The steel material has a structure in which a ratio of an amount Nblp of Nb in precipitates having particle sizes of larger than 100 nm to an amount Nbsp of Nb in precipitates having particle sizes of smaller than 20 nm is 0.10 to 2.0. The steel material also can contain a predetermined amount of one or more elements selected from V, Ti, Mo and W. COPYRIGHT: (C)2010,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材料，并且在截面加工后具有优异的低温韧性，成形性和耐疲劳性，并且 提供其制造方法。 解决方案：该制造方法包括赋予由以下表达式定义的累积热处理参数ΣAi的这种热历史或热加工历史：ΣAi=ΣäTi×（20 + log ti）}（其中ti表示热 第i步的时间（h）;第i步的热处理温度（K）为Ti，在850〜1150℃的温度范围内满足30,000〜20,000，在 500〜700℃的温度范围，含有0.03〜0.24％的C和至少0.001〜0.15％的Nb的基材。 钢材的结构是，具有粒径大于100nm的析出物中的Nb的量Nblp与粒径小于20nm的析出物中Nb的Nbbb的比例为0.10〜2.0。 钢材料还可以含有预定量的选自V，Ti，Mo和W中的一种或多种元素。（C）2010，JPO＆INPIT

公开(公告)号：JP2009203492A

公开(公告)日：2009-09-10

申请号：JP2008044266

申请日：2008-02-26

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

Inventor： TOYODA SHUNSUKE ,  KAWABATA YOSHIKAZU ,  HASHIMOTO YUJI ,  SONOBE OSAMU ,  SAITO OSAMU ,  SATO AKIO ,  GUNJI MAKIO

IPC: C22C38/00 ,  B21B1/26 ,  B21B3/00 ,  B21C37/08 ,  C21D8/10 ,  C22C38/26 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a high-tensile welded steel pipe for an automobile structural member having low temperature toughness, formability, and twisting fatigue resistance after cross-sectional forming, and to provide a method for producing the high-tensile welded steel pipe.
SOLUTION: A steel stock having a composition containing C, Si and Al in proper ranges, 1.01 to 1.99% Mn and 0.001 to 0.15% Nb, and in which the contents of P, S, N and O are regulated to prescribed values is subjected to hot rolling in which heating temperature, finish rolling draft and finish rolling finishing temperature are regulated to proper ranges, is thereafter annealed in the temperature range of 750 to 650°C after the finish of the hot rolling, and is subsequently coiled at a coiling temperature of 660 to 510°C, so as to be a hot rolled steel strip, the hot rolled steel strip is subjected to an electric resistance welded steel pipe-making stage having a width drawing rate of ≤10%, so as to be a welded steel pipe. In this way, the high-tensile strength welded steel pipe in which the surface layer of the pipe includes a structure composed of a fine ferrite phase in which Nb carbides of 1.5 to 60 nm are precipitated and a second phase other than that, and the hardness of the surface region in the range of 50 to 200 μm to the thickness direction from the outermost surface of the pipe or the innermost surface of the pipe is controlled can be obtained.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 解决的问题：为了提供一种在横截面形成之后具有低温韧性，成形性和抗扭疲劳性的汽车结构件的高强度焊接钢管，并且提供一种制造高张力的方法 焊接钢管。

解决方案：具有合适范围的C，Si和Al组成的钢坯，Mn为1.01至1.99％，Nb为0.001至0.15％，其中P，S，N和O的含量被规定为规定 对加热温度，精轧温度和精轧温度进行适当范围的热轧，然后在热轧结束后在750〜650℃的温度范围内进行退火，然后卷绕 在卷取温度为660〜510℃的条件下，将热轧钢带作为热轧钢带，进行宽度拉伸率≤10％的电阻焊钢管制造工序， 成为焊接钢管。 以这种方式，其中管的表层由具有1.5〜60nm的Nb碳化物的微细铁素体相和除此之外的第二相组成的高强度焊接钢管， 可以控制从管的最外表面或管的最内表面到50-200μm范围内的厚度方向的表面区域的硬度。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2011038155A

公开(公告)日：2011-02-24

申请号：JP2009187208

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 having ≥690 MPa tensile strength, suitable for automobile structural member and having together with high strength, excellent formability and excellent torsional fatigue resistance after cross-sectional forming in combination; and a manufacturing method therefor.
SOLUTION: A steel original material having the composition containing, by mass, 0.03-0.24% C, >0.044% to 0.109% 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, 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 turned to the stock for steel pipe, and a welded steel pipe is made through a pipe-making and a welding processes.
COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 要解决的问题：提供适用于汽车结构件的具有≥690MPa拉伸强度的高拉力钢，并且在横截面形成之后具有高强度，优异的成形性和优异的抗扭转疲劳性; 及其制造方法。 解决方案：将具有质量0.03-0.24％C，> 0.044％至0.109％V且进一步含有Nb和/或Ti的组合物的钢原材料在比其高的温度下进行热轧 由平均固体温度T v ，由log [V] [C] = -9500 / T v +6.72计算，形成高张力热轧钢板 汽车底盘部件的成形性和抗扭转性优异，此外，该钢板转向钢管坯料，通过制管和焊接工艺制造焊接钢管。 版权所有（C）2011，JPO＆INPIT

公开(公告)号：JP2009293067A

公开(公告)日：2009-12-17

申请号：JP2008146095

申请日：2008-06-03

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

Inventor： TOYODA SHUNSUKE ,  JODAI TETSUSHI ,  YAMASHITA TAKAKO ,  HASHIMOTO YUJI ,  KAWABATA YOSHIKAZU ,  SATO AKIO

IPC: C22C38/00 ,  C21D8/10 ,  C22C38/12 ,  C22C38/58

Abstract: PROBLEM TO BE SOLVED: To provide a high-tensile-strength steel material which is suitable for an automotive structure member and is superior in formability and fatigue resistance after a cross section has been worked, and to provide a manufacturing method therefor. SOLUTION: This manufacturing method includes imparting such a heat history that a cumulative heat-treatment parameter ΣAi which is defined by the expression: ΣAi=ΣäTi×(20+log ti)} (wherein ti represents heat-treatment period of time (hr) in i-th step; and Ti represents heat-treatment temperature (K) in the i-th step) satisfies 28,000 to 21,000 in a temperature range of 850 to 1,150°C and 20,000 to 13,000 in a temperature range of 500 to 700°C, and imparting such a working of which the cumulative rolling reduction in a temperature range of 850 to 1,050°C is 87 to 97%, to a base material having a composition containing 0.03 to 0.24% C and at least 0.001 to 0.15% Nb. Thereby, the steel material acquires a structure in which Nbsp/Nbsol that is a ratio of an amount of Nb in precipitates having particle sizes of smaller than 20 nm to an amount of dissolving Nb is 0.8 to 8.0. COPYRIGHT: (C)2010,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材，并且在加工截面之后的成型性和耐疲劳性优异，并提供其制造方法。 解决方案：该制造方法包括赋予由以下表达式定义的累积热处理参数ΣAi的热历史：ΣAi=ΣΔTi×（20 + log ti）}（其中，ti表示时间的热处理时间 （hr），Ti代表第i步骤中的热处理温度（K）在850〜1150℃的温度范围内为28,000〜21,000，在500℃的温度范围内为20,000〜13,000 至700℃，并将在850〜1050℃的温度范围内的累积压下率为87〜97％的工序赋予组成为0.03〜0.24％C，至少0.001〜 0.15％Nb。 因此，钢材获得了其中具有粒径小于20nm的析出物中的Nb的量与溶解Nb的量的Nb的比率为0.8-8.0的Nbsp / Nbsol的结构。 版权所有（C）2010，JPO＆INPIT