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    Steel for carburizing or carbonitriding use
    4.
    发明授权
    Steel for carburizing or carbonitriding use 有权

    公开(公告)号：US10329645B2

    公开(公告)日：2019-06-25

    申请号：US13980922

    申请日：2012-01-23

    申请人： Yoshihiro Daitoh

    发明人： Yoshihiro Daitoh

    IPC分类号： C22C38/18 ,  C22C38/00 ,  C23C8/22 ,  C23C8/32 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C21D7/13 ,  C21D9/32 ,  C21D1/06

    摘要： A steel for carburizing or carbonitriding use consisting of, by mass %, C: 0.1 to 0.3%, Si: 0.01 to 0.15%, Mn: 0.6 to 1.5%, S: 0.012 to 0.05%, Cr: 0.5 to 2.0%, Al: 0.030 to 0.050%, Ti: 0.0006 to 0.0025%, N: 0.010 to 0.025%, and O: 0.0006 to 0.0012%, and, optionally, at least one selected from Mo≤0.5%, Ni≤1.5% and Cu≤0.4%, and the balance of Fe and impurities. P and Nb are P≤0.025% and Nb≤0.003% respectively. Formulas of [−5.0≤log (Ti×N)≤−4.4] and [−12.5≤log (Al2×O3)≤−11.7] are satisfied. Austenite grain coarsening is prevented even when the steel is heated in the process of carburizing or carbonitriding, and even under various hot forging temperatures. The steel has excellent bending fatigue strength after carburizing or carbonitriding.

    STEEL FOR CARBURIZING OR CARBONITRIDING USE
    5.
    发明申请
    STEEL FOR CARBURIZING OR CARBONITRIDING USE 审中-公开
    加碳或碳化钢使用

    公开(公告)号：US20140030137A1

    公开(公告)日：2014-01-30

    申请号：US13980922

    申请日：2012-01-23

    申请人： Yoshihiro Daitoh

    发明人： Yoshihiro Daitoh

    IPC分类号： C22C38/18 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/04

    CPC分类号： C22C38/18 ,  C21D1/06 ,  C21D7/13 ,  C21D9/32 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/26 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/50 ,  C23C8/22 ,  C23C8/32

    摘要： A steel for carburizing or carbonitriding use consisting of, by mass %, C: 0.1 to 0.3%, Si: 0.01 to 0.15%, Mn: 0.6 to 1.5%, S: 0.012 to 0.05%, Cr: 0.5 to 2.0%, Al: 0.030 to 0.050%, Ti: 0.0006 to 0.0025%, N: 0.010 to 0.025%, and 0: 0.0006 to 0.0012%, and, optionally, at least one selected from Mo≦0.5%, Ni≦1.5% and Cu≦0.4%, and the balance of Fe and impurities. P and Nb are P≦0.025% and Nb≦0.003% respectively. Formulas of [−5.0≦log(Ti×N)≦−4.4] and [−12.5≦log(Al2×O3≦−11.7] are satisfied. Austenite grain coarsening is prevented even when the steel is heated in the process of carburizing or carbonitriding, and even under various hot forging temperatures. The steel has excellent bending fatigue strength after carburizing or carbonitriding.

    摘要翻译： 用于渗碳或碳氮共渗用途的钢，以质量％计含有C：0.1〜0.3％，Si：0.01〜0.15％，Mn：0.6〜1.5％，S：0.012〜0.05％，Cr：0.5〜2.0％ ：0.030〜0.050％，Ti：0.0006〜0.0025％，N：0.010〜0.025％，0：0.0006〜0.0012％，可选地，选自Mo@0.5%，Ni@1.5%，Cu @ 0.4 ％，余量为Fe和杂质。 P和Nb分别为P@0.025%和Nb@0.003%。 [-5.0@log（Ti×N）@ - 4.4]和[-12.5@log（Al2×O3@-11.7）的公式被满足，即使在渗碳过程中钢被加热也可以防止奥氏体晶粒粗化 碳氮共渗，甚至在各种热锻温度下，渗碳或碳氮共渗具有优异的弯曲疲劳强度。

    Hot-rolled steel bar or wire rod
    6.
    发明授权
    Hot-rolled steel bar or wire rod 有权
    热轧钢筋或线材

    公开(公告)号：US08491732B2

    公开(公告)日：2013-07-23

    申请号：US13461125

    申请日：2012-05-01

    申请人： Yoshihiro Daitoh ,  Akira Kito ,  Takayuki Nakamura

    发明人： Yoshihiro Daitoh ,  Akira Kito ,  Takayuki Nakamura

    IPC分类号： C22C38/18 ,  C22C38/22 ,  C22C38/44

    CPC分类号： C21D8/065 ,  C21D1/18 ,  C21D6/002 ,  C21D9/00 ,  C21D9/0075 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/28 ,  C23C8/02

    摘要： A hot-rolled steel bar or wire rod consisting of C: 0.1 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.4 to 2.0%, S: 0.003 to 0.05%, Cr: 0.5 to 3.0%, Al: 0.02 to 0.05%, and N: 0.010 to 0.025%, the balance being Fe and impurities, and the impurities containing P: 0.025% or less, Ti: 0.003% or less, and O: 0.002% or less, wherein the structure thereof is composed of a ferrite-pearlite structure, ferrite-pearlite-bainite structure, or ferrite-bainite structure; the standard deviation of ferrite fractions at the time when randomly selected 15 viewing fields of a transverse cross section are observed and measured with the area per one viewing field being 62,500 μm2 is 0.10 or less; and in a region from the surface to one-fifth of the radius and a region from the center to one-fifth of the radius in the transverse cross section, the amount of Al precipitating as AlN is 0.005% or less, and the density in terms of the number of AlN having a diameter of 100 nm or larger is 5/100 μm2 or less. In the hot-rolled steel bar or wire rod, even if hot forging is performed in various temperature ranges, austenite grains can be stably prevented from being coarsened at the time of heating for carburization.

    摘要翻译： 由C：0.1〜0.3％，Si：0.05〜1.5％，Mn：0.4〜2.0％，S：0.003〜0.05％，Cr：0.5〜3.0％，Al：0.02〜 0.05％，N：0.010〜0.025％，余量为Fe和杂质，含有P：0.025％以下，Ti：0.003％以下，O：0.002％以下的杂质，其结构为 铁素体 - 珠光体组织，铁素体 - 珠光体 - 贝氏体组织或铁素体 - 贝氏体组织; 当观察并测量随机选择的横截面的15个视场时，每个视野的面积为62,500mum2的铁素体部分的标准偏差为0.10或更小; 并且在从半径的表面到五分之一的区域和从横截面的半径的中心到五分之一的区域中，作为AlN的Al析出量为0.005％以下， 直径为100nm以上的AlN的数量的项为5/100mum2以下。 在热轧钢棒或线材中，即使在各种温度范围内进行热锻造，也可以稳定地防止在加热加热时使奥氏体晶粒粗大化。

    HOT-ROLLED STEEL CAR OR WIRE ROD
    7.
    发明申请
    HOT-ROLLED STEEL CAR OR WIRE ROD 有权
    热轧钢车或钢丝绳

    公开(公告)号：US20120263622A1

    公开(公告)日：2012-10-18

    申请号：US13461125

    申请日：2012-05-01

    申请人： Yoshihiro Daitoh ,  Akira Kito ,  Takayuki Nakamura

    发明人： Yoshihiro Daitoh ,  Akira Kito ,  Takayuki Nakamura

    IPC分类号： C22C38/38 ,  C22C38/06 ,  C22C38/08 ,  C22C38/58 ,  C22C38/18 ,  C22C38/22

    CPC分类号： C21D8/065 ,  C21D1/18 ,  C21D6/002 ,  C21D9/00 ,  C21D9/0075 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/28 ,  C23C8/02

    摘要： A hot-rolled steel bar or wire rod consisting of C: 0.1 to 0.3%, Si: 0.05 to 1.5%, Mn: 0.4 to 2.0%, S: 0.003 to 0.05%, Cr: 0.5 to 3.0%, Al: 0.02 to 0.05%, and N: 0.010 to 0.025%, the balance being Fe and impurities, and the impurities containing P: 0.025% or less, Ti: 0.003% or less, and O: 0.002% or less, wherein the structure thereof is composed of a ferrite-pearlite structure, ferrite-pearlite-bainite structure, or ferrite-bainite structure; the standard deviation of ferrite fractions at the time when randomly selected 15 viewing fields of a transverse cross section are observed and measured with the area per one viewing field being 62,500 μm2 is 0.10 or less; and in a region from the surface to one-fifth of the radius and a region from the center to one-fifth of the radius in the transverse cross section, the amount of Al precipitating as AlN is 0.005% or less, and the density in terms of the number of AlN having a diameter of 100 nm or larger is 5/100 μm2 or less. In the hot-rolled steel bar or wire rod, even if hot forging is performed in various temperature ranges, austenite grains can be stably prevented from being coarsened at the time of heating for carburization.

    摘要翻译： 由C：0.1〜0.3％，Si：0.05〜1.5％，Mn：0.4〜2.0％，S：0.003〜0.05％，Cr：0.5〜3.0％，Al：0.02〜 0.05％，N：0.010〜0.025％，余量为Fe和杂质，含有P：0.025％以下，Ti：0.003％以下，O：0.002％以下的杂质，其结构为 的铁素体 - 珠光体组织，铁素体 - 珠光体 - 贝氏体组织或铁素体 - 贝氏体组织; 在每个视场的面积为62,500μm2的情况下观察和测量随机选择的横截面的15个视野时的铁素体部分的标准偏差为0.10以下; 并且在从半径的表面到五分之一的区域和从横截面的半径的中心到五分之一的区域中，作为AlN的Al析出量为0.005％以下， 直径为100nm以上的AlN的数量的项为5/100μm2以下。 在热轧钢棒或线材中，即使在各种温度范围内进行热锻造，也可以稳定地防止在加热加热时使奥氏体晶粒粗大化。

    Railway wheel and manufacturing method of the railway wheel
    8.
    发明授权
    Railway wheel and manufacturing method of the railway wheel 失效
    铁路车轮和铁路车轮的制造方法

    公开(公告)号：US5899516A

    公开(公告)日：1999-05-04

    申请号：US787218

    申请日：1997-01-22

    申请人： Takashi Fujimura ,  Manao Anjiki ,  Taizo Makino ,  Yoshihiro Daitoh

    发明人： Takashi Fujimura ,  Manao Anjiki ,  Taizo Makino ,  Yoshihiro Daitoh

    IPC分类号： B60B17/00 ,  C21D1/84 ,  C21D9/34 ,  C22C38/00 ,  C22C38/18 ,  B60B37/00

    CPC分类号： B60B17/00 ,  C21D1/84 ,  C21D9/34

    摘要： A wheel has both wear resistance and heat-crack resistance sufficient for use in a high-speed railway vehicle. The chemical composition of a base steel comprises 0.4 to 0.75 % C, 0.4 to 0.95% Si, 0.6 to 1.2% Mn and less than 0.2% Cr. The wheel has a pearlitic microstructure in a region of at least 50 mm in depth from the tread surface of the wheel. When the tread of the wheel is quenched, a particular cooling process is applied in order to obtain the pearlitic structure.

    摘要翻译： 轮具有足以用于高速铁路车辆的耐磨性和耐热裂纹性。 基础钢的化学成分包含0.4〜0.75％的C，0.4〜0.95％的Si，0.6〜1.2％的Mn和小于0.2％的Cr。 该车轮在与车轮的胎面表面相距至少50mm的区域中具有珠光体组织。 当车轮的胎面被淬火时，应用特定的冷却过程以获得珠光体结构。