公开(公告)号：US20140060709A1

公开(公告)日：2014-03-06

申请号：US14077086

申请日：2013-11-11

Applicant: JFE BARS & SHAPES CORPORATION ,  NHK SPRING CO., LTD.

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

IPC: B60G99/00

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: Steel, excellent in corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, includes 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. The steel has a tensile strength of not less than 1,300 MPa.

Abstract translation: 对于车辆悬架弹簧部件，耐腐蚀性和低温韧性优异的钢包含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％ Mn质量，Cr：0.3〜0.8质量％，溶胶0.005〜0.080质量％。 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 1.00质量％的Cu和0.01〜1.00质量％的Ni，余量由Fe和不可避免的杂质构成，Ti +Nb≤0.07质量％。 钢的拉伸强度不低于1300MPa。

公开(公告)号：US20170021691A1

公开(公告)日：2017-01-26

申请号：US15276083

申请日：2016-09-26

Applicant: NHK SPRING CO., LTD. ,  JFE BARS & SHAPES CORPORATION

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

IPC: B60G21/055 ,  C21D8/06 ,  C21D1/18 ,  C21D1/40 ,  C21D1/42 ,  C22C38/00 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/00 ,  C22C38/58

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: A steel, having a high corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, the steel includes 0.21 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 being Fe and unavoidable impurities, with Ti+Nb≦0.07% by mass, wherein crystal grains of the steel after hardening have a prior austenite grain size number of 7.5 to 10.5, and the steel having a tensile strength of not less than 1,300 MPa.

Abstract translation: 作为用于车辆悬架弹簧部件的具有高耐腐蚀性和低温韧性的钢，该钢包含C：0.21〜0.35质量％，0.6质量％以下，Si：1〜1.5质量％ 至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 1.00质量％的Cu，0.01〜1.00质量％的Ni，余量为Fe和不可避免的杂质，Ti +Nb≤0.07质量％，其中，硬化后的钢的结晶粒子具有原奥氏体晶粒数 为7.5〜10.5，钢的拉伸强度为1300MPa以上。

公开(公告)号：US20160222497A1

公开(公告)日：2016-08-04

申请号：US15021048

申请日：2014-09-11

Applicant: JFE STEEL CORPORATION ,  SUMIHATSU CO., LTD. ,  NHK SPRING CO., LTD.

Inventor： Minoru HONJO ,  Kiyoshi UWAI ,  Shigeru ENDO ,  Katsutoshi YAMASHITA ,  Koei TSURU ,  Keiichi FUJIE ,  Akira TANGE

IPC: C22C38/60 ,  C22C38/04 ,  C22C38/02 ,  C21D9/52 ,  C21D9/02 ,  C21D8/06 ,  C21D6/00 ,  C21D1/18 ,  C22C38/18 ,  C22C38/00

CPC classification number: C22C38/60 ,  C21D1/18 ,  C21D1/25 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/06 ,  C21D8/065 ,  C21D9/02 ,  C21D9/525 ,  C22C38/00 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  F16F1/02

Abstract: Provided is high strength steel for springs that, compared to conventional high strength steel for springs, has excellent decarburization resistance and scale exfoliation property, by optimization of the added amounts of C, Si, Mn, and Cr as well as of Sb and Sn. The steel for springs contains C: more than 0.45 mass % and less than 0.65 mass %, Si: 0.15 mass % or more and 0.70 mass % or less, Mn: 0.10 mass % or more and 1.00 mass % or less, Cr: 0.20 mass % or more and 1.50 mass % or less, P: 0.025 mass % or less, S: 0.025 mass % or less, O: 0.0015 mass % or less, Sb: 0.010 mass % or more and less than 0.030 mass %, and Sn: 0.010 mass % or more and 0.030 mass % or less, under predetermined conditions.

Abstract translation: 本发明提供弹簧用高强度钢，与传统的弹簧用高强度钢相比，通过优化C，Si，Mn，Cr以及Sb和Sn的添加量，具有优异的耐脱碳性和抗剥离性。 弹簧钢含有C：大于0.45质量％且小于0.65质量％，Si：0.15质量％以上且0.70质量％以下，Mn：0.10质量％以上且1.00质量％以下，Cr：0.20 质量％以上且1.50质量％以下，P：0.025质量％以下，S：0.025质量％以下，O：0.0015质量％以下，Sb：0.010质量％以上且小于0.030质量％，以及 Sn：0.010质量％以上且0.030质量％以下。

公开(公告)号：US20130240093A1

公开(公告)日：2013-09-19

申请号：US13886106

申请日：2013-05-02

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki OKADA ,  Akira TANGE ,  Koichi TANGO ,  Isao SUMIYOSHI

IPC: F16F1/02 ,  C22C38/50 ,  C22C38/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D9/02 ,  C22C38/42

CPC classification number: F16F1/021 ,  C21D7/06 ,  C21D8/06 ,  C21D8/065 ,  C21D9/02 ,  C21D9/52 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/28 ,  C22C38/34 ,  C22C38/42 ,  C22C38/46 ,  C22C38/50 ,  F16F1/02

Abstract: A steel for high-strength spring has an Ac3 transformation temperature as an indicator of the decarburization performance, which is calculated by Equation (1) below, is from 859 to 885° C., a maximum hardened diameter DI as an indicator of the hardening performance, which is calculated by Equation (2) below, is from 70 to 238 mm, and a temper hardness HRC as an indicator of the spring performance, which is calculated by Equation (3) below, is from 50 to 55. Ac3=910−203×√{square root over (C)}−15.2Ni+44.7Si+104V+31.5Mo+13.1W  (1) DI=DO×fSi×fMn×fP×fS×fCu×fNi×fCr  (2) HRC=38.99+17.48C+2.55Si−2.28Ni+2.37Cr+8.04Ti  (3) wherein, D0=8.65×√{square root over (C)}, fSi=1+0.64×% Si, fMn=1+4.10×% Mn, fP=1+2.83×% P, fS=1−0.62×% S, fCu=1+0.27×% Cu, fNi=1+0.52×% Ni, and fCr=1+2.33×% Cr.

Abstract translation: 用于高强度弹簧的钢具有作为脱碳性能的指示剂的Ac 3相变温度，其由下式（1）计算，为859〜885℃，最大硬化直径DI为硬化指标 由下式（2）计算的性能为70〜238mm，由下式（3）计算出的作为弹簧性能的指标的回火硬度HRC为50〜55。Ac3 = 910-203×√{平方根（C）} - 15.2Ni + 44.7Si + 104V + 31.5Mo + 13.1W（1）DI = DO×fSi×fMn×fP×fS×fCu×fNi×fCr（2） HRC = 38.99 + 17.48℃+ 2.55Si-2.28Ni + 2.37Cr + 8.04Ti（3）其中，D0 = 8.65×√{平方根超过（C）}，fSi = 1 + 0.64×％Si，fMn = 1 + 4.10×％Mn，fP = 1 + 2.83×％P，fS = 1-0.62×％S，fCu = 1 + 0.27×％Cu，fNi = 1 + 0.52×％Ni，fCr = 1 + 2.33×％ 。