公开(公告)号：EP3214189A1

公开(公告)日：2017-09-06

申请号：EP15855119.2

申请日：2015-10-26

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) ,  NHK Spring Co., Ltd.

Inventor： KOCHI, Takuya ,  HATANO, Hitoshi ,  TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika

IPC: C21D9/02 ,  C21D9/08 ,  C22C38/00 ,  C22C38/50

CPC classification number: C21D9/08 ,  C21D6/005 ,  C21D6/008 ,  C21D9/02 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/40 ,  C22C38/42 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50

Abstract: To provide a method for manufacturing steel for a high-strength hollow spring that exhibits excellent resistance to hydrogen embrittlement. Disclosed is a method for manufacturing steel for a hollow spring obtained by quenching and tempering a seamless pipe for use as a material of the hollow spring, wherein the seamless pipe including predetermined components is subjected to a heat treatment is performed to satisfy quenching conditions (1) mentioned below, and to satisfy tempering conditions (2) mentioned below,
(1) quenching conditions: 26 , 000 ≤ T 1 + 273 × log t 1 + 20 ≤ 29 , 000 900 °C ≤ T 1 ≤ 1 , 050 °C , 10 seconds ≤ t 1 ≤ 1 , 800 seconds , where T1 is a quenching temperature (°C), and t1 is a holding time (seconds) in a temperature range of 900°C or higher, and
(2) tempering conditions: 13 , 000 ≤ T 2 + 273 × log t 2 + 20 ≤ 15 , 500 T 2 ≤ 550 °C , and t 2 ≤ 3 , 600 seconds , where T2 is a tempering temperature (°C), and t2 is a total time (seconds) from start of heating to completion of cooling.

Abstract translation: 提供一种表现出优异的耐氢脆性的高强度空心弹簧用钢的制造方法。 本发明提供一种空心弹簧用钢的制造方法，该空心弹簧用钢通过对作为中空弹簧的材质的无缝管进行淬火回火而得到，其中，对含有规定成分的无缝管实施热处理，以满足淬火条件（1 ），满足下述回火条件（2），（1）淬火条件：26,000≤T1+ 273×logt1 +20≤29,000900℃≤T1≤1,050℃，10秒≤t1≤1,800秒，其中 T1是淬火温度（℃），t1是在900℃以上的温度范围内的保持时间（秒），和（2）回火条件：13,000≤T2+ 273×logt2 +20≤15,500T2≤ 550℃，t2≤3,600秒，其中T2是回火温度（℃），t2是从加热开始到冷却结束的总时间（秒）。

公开(公告)号：EP2578900B1

公开(公告)日：2016-04-20

申请号：EP11792241.9

申请日：2011-05-12

Applicant: NHK Spring Co.,Ltd.

Inventor： TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika ,  SHIGEOKA, Iwao ,  KATO, Tadakazu ,  INOGUCHI, Shinichi

IPC: F16F1/02 ,  B24C1/04 ,  B24C1/10 ,  F16F1/28 ,  F16F1/18

CPC classification number: B21D53/886 ,  B24C1/10 ,  B24C3/325 ,  F16F1/18 ,  F16F2226/00

公开(公告)号：EP2857537A1

公开(公告)日：2015-04-08

申请号：EP13794071.4

申请日：2013-02-25

Applicant: Nippon Steel & Sumitomo Metal Corporation ,  NHK Spring Co., Ltd.

Inventor： ISHITSUKA, Tetsuo ,  KOYUBA, Motofumi ,  IWAMURA, Masamichi ,  TANGE, Akira ,  TAKAHASHI, Ken ,  KURIMOTO, Kiyoshi ,  WAKABAYASHI, Yutaka

IPC: C22C38/00 ,  B21C1/00 ,  B21C37/08 ,  B60G21/055 ,  C21D8/10 ,  C21D9/08 ,  C22C38/32 ,  C22C38/54

CPC classification number: C21D9/50 ,  B21C37/08 ,  B21C51/00 ,  B60G21/055 ,  B60G2206/427 ,  B60G2206/72 ,  C21D7/06 ,  C21D7/13 ,  C21D8/10 ,  C21D8/105 ,  C21D9/08 ,  C21D9/085 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/50 ,  C22C38/54

Abstract: A hollow stabilizer having an excellent fatigue property and higher strength compared to the conventional ones has a chemical composition containing 0.26% to 0.30% of C, 0.05% to 0.35% of Si, 0.5% to 1.0% of Mn, 0.05% to 1.0% of Cr, 0.005% to 0.05% ofTi, 0.0005% to 0.005% of B, and 0.0005% to 0.005% of Ca, wherein; Al, P, S, N, and O are limited to 0.08% or less, 0.05% or less, less than 0.0030%, 0.006% or less, and 0.004% or less, respectively, a remainder of the chemical composition consists of Fe and unavoidable impurities, a value of a product of the Mn content and the S content is 0.0025 or less, and a critical cooling rate Vc90 represented by a predetermined equation is 40°C/s or less; and wherein a metallic structure comprises a tempered martensite, a length of elongated MnS present at a center part in a thickness direction of the hollow stabilizer is 150 µm or less, a HRC is from 40 to 50, a thickness to outer diameter ratio is 0.14 or more, and a depth of a decarburized layer at an inner surface part is 20 µm or less from the inner surface; and a steel pipe for hollow stabilizers used as a material for the hollow stabilizer.

Abstract translation: 具有相比于常规的优异的疲劳特性和更高强度的中空稳定器的化学组成包含0.26％至0：C的30％，0.05％至0.35％的Mn，Si组成的0.5％到1.0％，0.05％至1.0％ 的Cr，0.005％至0.05％OFTI，0.0005％至0.005％的B，和Ca，worin的0.0005％〜0.005％; 的Al，P，S，N，和O被限制为0.08％或小于0.05％或更少，小于0.0030％，0.006％或更少，和0.004％或更少的，分别为一Fe的化学组成besteht的剩余部分 和不可避免的杂质，Mn含量和S含量的积的值是0.0025或更小，并且通过预定的式子表​​示的临界冷却速率VC90是40℃/秒或更小; 和worin金属结构包括回火马氏体，在中空稳定器的厚度方向的中央部存在细长的MnS的长度为150微米或更小，一个HRC为40〜50，厚度与外径之比是0:14 以上，并且在面内部的脱碳层的深度为从内表面20微米或更小; 和钢管作为中空稳定用作用于中空稳定的材料。

公开(公告)号：EP2397571A1

公开(公告)日：2011-12-21

申请号：EP10741269.4

申请日：2010-02-10

Applicant: NHK Spring Co., Ltd. ,  JFE Bars & Shapes Corporation

Inventor： KIKUCHI, Katsuhiko ,  TOMITA, Kunikazu ,  TAMAI, Yutaka ,  HATTORI, Kazuaki ,  INOUE, Kanji ,  TANGE, Akira ,  MORI, Norihiko ,  GOTO, Yurika ,  KURIMOTO, Kiyoshi

IPC: C22C38/58 ,  B60G21/055 ,  C21D9/00

CPC classification number: C22C38/02 ,  C21D1/25 ,  C21D1/28 ,  C21D9/0075 ,  C21D9/08 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

Abstract: According to one embodiment, a high-strength stabilizer steel for vehicles having excellent corrosion resistance and low-temperature toughness, containing 0.07 to 0.20% C, more than 0.6% and 1.5% or less Si, 1 to 3% Mn, 0.1 to 1.0% Cr, 0.005 to 0.080% sAl, 0.005 to 0.060% Ti, 0.005 to 0.060% Nb, 0.070% or less Ti+Nb, 150 ppm or less N, 0.035% or less P, 0.035% or less S, 0.01 to 1.00% Cu, 0.01 to 1.00% Ni, the remainder being Fe, and unavoidable impurities, wherein a structure before molding a stabilizer is any one of a bainite, a martensite, and a mixed structure of bainite/martensite and an original austenitic crystal grain size number after a heat treatment of the stabilizer is Gh 9 or more.

Abstract translation: 。根据一个实施例，高强度稳定剂钢具有优异的耐腐蚀性和低温韧性的车辆，包含12:07至00：20％C，大于0.6％和1.5％或更低的Si，1〜3％的Mn，0.1〜1.0 ％的Cr，0.005〜0.080％萨尔，0.005至0.060％的Ti，0.005〜0.060％的Nb，0.070％或更少的Ti + Nb的，150ppm或更低的N，0.035％或更少的P，0.035％或更少的S，0点01到1:00 ％的Cu，0点01分至1：00％的Ni，其余为Fe和不可避免的杂质，worin成型稳定剂前的结构是一个贝氏体中的任一项中，马氏体，贝氏体/马氏体和原奥氏体晶粒尺寸的混合组织 作为稳定剂，在热处理后数为GH 9以上。

公开(公告)号：EP3214189B1

公开(公告)日：2019-08-14

申请号：EP15855119.2

申请日：2015-10-26

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) ,  NHK Spring Co., Ltd.

Inventor： KOCHI, Takuya ,  HATANO, Hitoshi ,  TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika

IPC: C21D9/02 ,  C21D9/08 ,  C22C38/00 ,  C22C38/50 ,  C22C38/20 ,  C22C38/40 ,  C22C38/42 ,  C22C38/46 ,  C22C38/48 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18

公开(公告)号：EP2857537B1

公开(公告)日：2018-07-25

申请号：EP13794071.4

申请日：2013-02-25

Applicant: Nippon Steel & Sumitomo Metal Corporation ,  NHK Spring Co., Ltd.

Inventor： ISHITSUKA, Tetsuo ,  KOYUBA, Motofumi ,  IWAMURA, Masamichi ,  TANGE, Akira ,  TAKAHASHI, Ken ,  KURIMOTO, Kiyoshi ,  WAKABAYASHI, Yutaka

IPC: B21C37/08 ,  B60G21/055 ,  C21D8/10 ,  C21D9/08 ,  C22C38/32 ,  B21C51/00 ,  C21D7/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C21D7/13 ,  C21D9/50 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/50

CPC classification number: C21D9/50 ,  B21C37/08 ,  B21C51/00 ,  B60G21/055 ,  B60G2206/427 ,  B60G2206/72 ,  C21D7/06 ,  C21D7/13 ,  C21D8/10 ,  C21D8/105 ,  C21D9/08 ,  C21D9/085 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/50 ,  C22C38/54

Abstract: A hollow stabilizer having an excellent fatigue property and higher strength compared to the conventional ones has a chemical composition containing 0.26% to 0.30% of C, 0.05% to 0.35% of Si, 0.5% to 1.0% of Mn, 0.05% to 1.0% of Cr, 0.005% to 0.05% ofTi, 0.0005% to 0.005% of B, and 0.0005% to 0.005% of Ca, wherein; Al, P, S, N, and O are limited to 0.08% or less, 0.05% or less, less than 0.0030%, 0.006% or less, and 0.004% or less, respectively, a remainder of the chemical composition consists of Fe and unavoidable impurities, a value of a product of the Mn content and the S content is 0.0025 or less, and a critical cooling rate Vc90 represented by a predetermined equation is 40°C/s or less; and wherein a metallic structure comprises a tempered martensite, a length of elongated MnS present at a center part in a thickness direction of the hollow stabilizer is 150 µm or less, a HRC is from 40 to 50, a thickness to outer diameter ratio is 0.14 or more, and a depth of a decarburized layer at an inner surface part is 20 µm or less from the inner surface; and a steel pipe for hollow stabilizers used as a material for the hollow stabilizer.

公开(公告)号：EP3124638A1

公开(公告)日：2017-02-01

申请号：EP15769463.9

申请日：2015-03-23

Applicant: JFE Bars & Shapes Corporation ,  Nhk Spring Co., Ltd.

Inventor： FUKUOKA, Kazuaki ,  TOMITA, Kunikazu ,  TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika

IPC: C22C38/00 ,  B60G21/055 ,  C21D8/06 ,  C22C38/54 ,  C22C38/60

CPC classification number: C21D9/0068 ,  B60G21/055 ,  C21D1/18 ,  C21D1/60 ,  C21D7/06 ,  C21D8/065 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A steel has a predetermined chemical composition with a balance being Fe and incidental impurities, wherein a sum of Cu content and Ni content is 0.15 mass% or more, and a crystal grain size after forming into a stabilizer shape and quenching is in a range of 7.5 to 10.5 in prior austenite crystal grain size number. Thus, a highly durable stabilizer steel that has a tensile strength of 1200 MPa or more and excellent normal-temperature and low-temperature toughness and is used in an environmentally friendly manufacturing process at lower cost can be realized.

Abstract translation: 的钢具有带有余量为Fe和不可避免的杂质构成，worin Cu含量和Ni含量之和是零点15质量％以上的预定化学组成，并形成为稳定剂的形状和淬火后的晶粒尺寸在范围的 7.5至10.5在旧奥氏体结晶粒度号。 因此，高度耐用的钢稳定剂那​​样具有1200MPa以上和优良的常温和低温韧性的拉伸强度和在环保的制造过程被用于以更低的成本即可实现。

公开(公告)号：EP2708612A1

公开(公告)日：2014-03-19

申请号：EP12782769.9

申请日：2012-05-11

Applicant: NHK Spring Co., Ltd. ,  JFE Bars & Shapes Corporation

Inventor： TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika ,  KIKUCHI, Katsuhiko ,  TOMITA, Kunikazu ,  FUKUOKA, Kazuaki ,  HATTORI, Kazuaki

IPC: C22C38/00 ,  B60G21/055 ,  C21D9/02 ,  C22C38/58 ,  C22C38/60 ,  F16F1/02

CPC classification number: B60G21/055 ,  B60G99/00 ,  B60G2206/427 ,  B60G2206/724 ,  B60G2206/8103 ,  B60G2206/81035 ,  B60G2206/8401 ,  B60G2206/8402 ,  C21D1/18 ,  C21D1/40 ,  C21D1/42 ,  C21D6/005 ,  C21D7/06 ,  C21D8/065 ,  C21D9/0075 ,  C21D9/02 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C22C38/60 ,  Y02P10/253

Abstract: Disclosed is steel, excellent in corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, characterized in that it comprises 0.15 to 0.35% by mass of C, more than 0.6% by mass but 1.5% by mass or less of Si, 1 to 3% by mass of Mn, 0.3 to 0.8% by mass of Cr, 0.005 to 0.080% by mass of sol. Al, 0.005 to 0.060% by mass of Ti, 0.005 to 0.060% by mass of Nb, not more than 150 ppm of N, not more than 0.035% by mass of P, not more than 0.035% by mass of S, 0.01 to 1.00% by mass of Cu, and 0.01 to 1.00% by mass of Ni, the balance consisting of Fe and unavoidable impurities, with Ti + Nb ≤ 0.07% by mass, and has a tensile strength of not less than 1,300 MPa.

Abstract translation: 公开了一种用于车辆悬架弹簧部件的耐腐蚀性和低温韧性优异的钢，其特征在于，其含有0.15〜0.35质量％的C，0.6质量％以上且1.5质量％以下的Si ，1〜3质量％的Mn，0.3〜0.8质量％的Cr，0.005〜0.080质量％的溶胶。 Al，0.005〜0.060质量％的Ti，0.005〜0.060质量％的Nb，不大于150ppm的N，不大于0.035质量％的P，不大于0.035质量％的S，0.01至 Cu：1.00质量％，Ni：0.01〜1.00质量％，余量由Fe和不可避免的杂质构成，Ti + Nb‰0.07质量％，拉伸强度为1300MPa以上。

公开(公告)号：EP2578900A1

公开(公告)日：2013-04-10

申请号：EP11792241.9

申请日：2011-05-12

Applicant: Nhk Spring Co., Ltd.

Inventor： TANGE, Akira ,  KURIMOTO, Kiyoshi ,  GOTO, Yurika ,  SHIGEOKA, Iwao ,  KATO, Tadakazu ,  INOGUCHI, Shinichi

IPC: F16F1/02 ,  B24C1/04 ,  B24C1/10 ,  F16F1/28

CPC classification number: B21D53/886 ,  B24C1/10 ,  B24C3/325 ,  F16F1/18 ,  F16F2226/00

Abstract: A production method for a leaf spring, which can improve the durability of the eye portion and the productivity and which can reduce the production cost, is provided.
In forming of a gap portion 115, a leading end portion 113 of an eye portion 112 faces a facing portion 114 such that each straight line L1 and L2 does not cross the leading end portion 113 of the eye portion 112, the straight line L1 connecting an intersection point T1 and a center point S1 of a reflection surface of a reflection member, the straight line L2 connecting an intersection point T1 and a center point S2 of a reflection surface of a reflection member, the intersection point T1 being between a perpendicular line H1 and a surface of the facing portion 114, the perpendicular line H1 extending from a leaf portion 111 side end point 113A of the leading end portion 113 of the eye portion 112 to the facing portion 114. Thus, shots, which are reflected by the reflection surface of the reflection member in the shot peening to the eye portion 112 inner surface, are projected to the entire surface of the facing portion 114 at the gap portion 115. In forming of the eye portion 112, cutting of a leading end portion thereof is unnecessary.

Abstract translation: 提供了一种可以提高眼部的耐久性和生产率的片簧的制造方法，能够降低生产成本。 在形成间隙部115时，眼部112的前端部113面对面对部114，使得直线L1和L2不与眼部112的前端部113交叉，直线L1连接 交点T1和反射构件的反射面的中心点S1，连接交点T1和反射构件的反射面的中心点S2的直线L2，交点T1在垂直线之间 H1和面对部分114的表面，垂直线H1从眼部112的前端部113的叶部111侧端点113A延伸到面对部分114.因此，由 在眼部112内表面的喷丸硬化中的反射构件的反射面在间隙部115处突出到对置部114的整个表面。在形成眼部112时，切割 其前端的部分是不必要的。