公开(公告)号：US20060225814A1

公开(公告)日：2006-10-12

申请号：US11401450

申请日：2006-04-11

申请人： Koki Mizuno ,  Hideki Matsuda ,  Seiji Kobayashi ,  Hisato Takeuchi ,  Katsunori Takada ,  Yutaka Kurebayashi

发明人： Koki Mizuno ,  Hideki Matsuda ,  Seiji Kobayashi ,  Hisato Takeuchi ,  Katsunori Takada ,  Yutaka Kurebayashi

IPC分类号： C23C8/32

CPC分类号： C23C8/32 ,  C23C8/02

摘要： A surface of a steel, as a material for a crankshaft, is nitrocarburized. The steel contains, as alloy elements C having a content 0.10 mass % or more 0.30 mass % or less, Si having a content 0.5 mass % or more and 0.3 mass % or less, Mn having a content 0.3 mass % or more and 1.5 mass % or less, Mo having a content 0.8 mass % or more and 2.0 mass % or less, Cr having a content 0.1 mass % or more and 1.0 mass % or less, and V having a content 0.1 mass % or more and 0.5 mass % or less, with a remainder consisting of Fe and inevitable impurities. The contents of the alloy elements fall within ranges: 2.0 mass %≦Mn+Cr+Mo≦3.0 mass %, 2.3 mass %≦C+Mo+5V ≦3.7 mass %, and 2.7 mass %≦2.16 Cr+Mo+2.54V≦4.0 mass %. If a steel sample extracted from a central portion of the nitrocarburized steel free from an influence of the nitrocarburizing treatment is austenitized at 1200° C. for one hour, and cooled to a room temperature so that a cooling rate at which the steel sample passes through a temperature range between 900° C. and 300° C. is 0.5° C./second, then an area percentage of a bainite structure in steel structures is 80% or more and a Vickers hardness measured at a cross section is 260 Hv or more and 330 Hv or less. A surface hardness of a nitrocarburized layer is 650 Hv or more, a formation depth of the nitrocarburized layer is 0.3 mm or more, and a hardness of the central portion is 340 Hv or more. Thereby a crankshaft which is excellent both in the machinability and in fatigue strength, even after nitrocarburizing treatment on the surface, is provided.

摘要翻译： 作为曲轴的材料的钢的表面被氮碳共渗。 钢含有含量为0.10质量％以上且0.30质量％以下的合金成分C，含有0.5质量％以上且0.3质量％以下的Si，含有0.3质量％以上且1.5质量％的Mn ％以下，含量为0.8质量％以上且2.0质量％以下的Mo为0.1质量％以上且1.0质量％以下的Cr，含量为0.1质量％以上至0.5质量％的V以下， 或更少，余量由Fe和不可避免的杂质组成。 合金元素含量在2.0质量％<= Mn + Cr + Mo <= 3.0质量％，2.3质量％<= C + Mo + 5V≤3.3质量％，2.7质量％<= 2.16Cr的范围内 + Mo + 2.54V <= 4.0质量％。 如果不受氮碳共渗处理的影响，从氮碳共渗钢的中央部提取的钢样品在1200℃下奥氏体化1小时，冷却至室温，钢样品通过的冷却速度 在900℃至300℃之间的温度范围为0.5℃/秒，则钢结构中贝氏体组织的面积百分比为80％以上，横截面测得的维氏硬度为260Hv或 多达330 Hv以下。 氮碳共渗层的表面硬度为650Hv以上，氮覆层的形成深度为0.3mm以上，中央部的硬度为340Hv以上。 因此，即使在表面进行氮碳共渗处理之后，也提供了在机械加工性和疲劳强度方面优异的曲轴。

公开(公告)号：US20060048860A1

公开(公告)日：2006-03-09

申请号：US10527318

申请日：2003-09-11

申请人： Hideki Matsuda ,  Mitsuo Takashima ,  Koichiro Inoue ,  Yutaka Kurebayashi ,  Yasushi Matsumura

发明人： Hideki Matsuda ,  Mitsuo Takashima ,  Koichiro Inoue ,  Yutaka Kurebayashi ,  Yasushi Matsumura

IPC分类号： C23C8/26

CPC分类号： C22C38/42 ,  C21D1/06 ,  C22C38/02 ,  C22C38/04 ,  C23C8/26 ,  C23C8/50

摘要： A mechanical component 1 composed of a steel is surface-hardened by nitriding, and specifically has a surficial layer 2 raised in the surface hardness by the nitriding, and an inner portion 3 not affected by the nitriding and showing a nearly constant hardness. Vickers hardness of the inner portion 3 is adjusted to 190 to 260 HV, Vickers hardness of the surficial portion 2 measured at a reference position corresponded to a 50 μm depth from the component surface is adjusted to 340 to 460 HV, and effective depth of hardened layer measured from the component surface 4, where a Vickers hardness of 270 HV is achieved, is adjusted to 0.3 mm or more. This makes it possible to provide a mechanical component which is composed of a steel and surface-hardened by nitriding, and is successfully improved in the strength and bending straightening property, and also to provide a method of fabricating the same.

摘要翻译： 由钢构成的机械部件1通过氮化进行表面硬化，具体地，具有通过氮化而在表面硬度上升高的表面层2和不受氮化影响的内部部分3，并且显示出几乎恒定的硬度。 将内部部分3的维氏硬度调节至190至260HV，在与从部件表面相对应的50μm深度的参考位置处测量的表面部分2的维氏硬度调节至340至460HV，并且有效的硬化深度 从实现了维氏硬度为270HV的部件表面4测量的层被调节到0.3mm以上。 这使得可以提供由钢组成并通过氮化表面硬化的机械部件，并且成功地提高了强度和弯曲矫直性能，并且还提供了其制造方法。

公开(公告)号：US4927601A

公开(公告)日：1990-05-22

申请号：US240658

申请日：1988-09-06

申请人： Tomohito Iikubo ,  Yutaka Kurebayashi

发明人： Tomohito Iikubo ,  Yutaka Kurebayashi

IPC分类号： C22C38/00 ,  C22C38/22 ,  C22C38/24 ,  F16C33/30

CPC分类号： C22C38/22 ,  C22C38/24 ,  F16C33/30 ,  Y10S148/906

摘要： A heat resisting bearing steel having improved rolling fatigue life is disclosed. This steel consists essentially of 0.6-0.9% C, up to 0.5% Si, up to 0.5% Mn, 3.0-5.5% Cr, 3.0-5.0% Mo and 0.5-1.5% V, and the balance being Fe and inevitable impurities, and is characterized in that the content of large Al.sub.2 O.sub.3 inclusions with 10 micron or larger length is restricted to 1.5 ppm or less.The rolling fatigue life of this steel is long and fluctuation of the life is small, and therefore, the steel is highly reliable. It is suitable for the material of bearing to be used at a high peripheral speed and a high temperature such as the main rotational bearings of a heat engine such as a gas turbine.

摘要翻译： 公开了一种具有改善的滚动疲劳寿命的耐热轴承钢。 该钢基本上由0.6-0.9％C，至多0.5％Si，至多0.5％Mn，3.0-5.5％Cr，3.0-5.0％Mo和0.5-1.5％V组成，余量为Fe和不可避免的杂质， 其特征在于，具有10微米或更大长度的大Al 2 O 3夹杂物的含量被限制在1.5ppm以下。 该钢的滚动疲劳寿命长，寿命波动小，因此钢的可靠性高。 适用于高周速，高温的轴承用材料，例如燃气轮机等发动机的主旋转轴承。

公开(公告)号：US06649125B2

公开(公告)日：2003-11-18

申请号：US10158065

申请日：2002-05-31

申请人： Masakazu Hayaishi ,  Yutaka Kurebayashi

发明人： Masakazu Hayaishi ,  Yutaka Kurebayashi

IPC分类号： C22C3860

CPC分类号： C22C38/60 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

摘要： Disclosed is a free-cutting steel which exhibits good machinability in turning and small roughness of the turned surfaces, and in which substantially no macro-streak-flaw occurs. The free-cutting steel contains, by weight %, C: 0.03-0.20%, Mn: 0.5-3.0%, P: 0.02-0.40%, S: more than 0.2% up to 1.0%, one or both of Ti and Zr (in case of both, the total amount): 0.01-3.0%, O: 0.0005-0.0050% and Pb: less than 0.01%, the balance being Fe and inevitable impurities. The steel is characterized in that it contains, as the inclusion therein, Ti-based and/or Zr-based carbosulfide compound or compounds. The steel may further contain at least one from the group of Bi: up to 0.4%, Se: up to 0.5% and Te: up to 0.1%.

摘要翻译： 公开了一种切削钢，其在车削时具有良好的机加工性和转弯表面的粗糙度，并且其中基本上没有发生宏观条纹缺陷。 切削钢以C：0.03-0.20％，Mn：0.5-3.0％，P：0.02-0.40％，S：大于0.2％至1.0％的重量％含有Ti和Zr中的一种或两种 （两者均为总量）：0.01-3.0％，O：0.0005〜0.0050％，Pb：小于0.01％，余量为Fe和不可避免的杂质。 钢的特征在于，其中包含Ti基和/或Zr基硫化碳化合物或其化合物。 钢可以进一步含有Bi：至多0.4％，Se：至多0.5％和Te：至多0.1％中的至少一种。

公开(公告)号：US20050045249A1

公开(公告)日：2005-03-03

申请号：US10936800

申请日：2004-09-09

申请人： Yutaka Kurebayashi ,  Toshimitsu Kimura ,  Takuro Yamaguchi ,  Keizo Otani ,  Noriko Uchiyama

发明人： Yutaka Kurebayashi ,  Toshimitsu Kimura ,  Takuro Yamaguchi ,  Keizo Otani ,  Noriko Uchiyama

IPC分类号： C23C8/22 ,  C23C8/80 ,  F16C33/62 ,  C23C8/32

CPC分类号： F16C33/62 ,  C23C8/22 ,  C23C8/80

摘要： A bearing pressure-resistant member, including a matrix and a carbide dispersed in the matrix, the carbide having an average particle size of not more than 0.3 μm. A carbon (C) content in an outer surface of the bearing pressure-resistant member is in a range of 0.6 to 1.5 mass percent. A process for making the bearing pressure-resistant member including subjecting a workpiece containing C to either of gas carburizing and gas carbonitriding to enhance the C content in the outer surface of the workpiece to 0.6 to 1.5 mass percent, holding the workpiece at a first temperature not more than an Ac1 transformation point under reduced pressure, heating the workpiece to a second temperature not less than the Ac1 transformation point under reduced pressure, followed by holding the workpiece at the second temperature, and subjecting the workpiece to quenching.

摘要翻译： 一种轴承耐压构件，其包括基体和分散在基体中的碳化物，所述碳化物的平均粒径不大于0.3μm。 轴承耐压部件的外表面的碳（C）含量在0.6〜1.5质量％的范围内。 一种制造所述轴承耐压构件的方法，包括使含有C的工件对气体渗碳和气体碳氮共渗进行任一种以将工件外表面中的C含量提高至0.6至1.5质量％，将工件保持在第一温度 在减压下不超过Ac1相变点，在减压下将工件加热至不小于Ac1相变点的第二温度，然后将工件保持在第二温度，并对工件进行淬火。

公开(公告)号：US20050022906A1

公开(公告)日：2005-02-03

申请号：US10499657

申请日：2003-01-24

申请人： Takaaki Harasaki ,  Takuya Nogami ,  Noriyuki Yamada ,  Katsuaki Shiiki ,  Shinya Takahashi ,  Takashi Kano ,  Yutaka Kurebayashi

发明人： Takaaki Harasaki ,  Takuya Nogami ,  Noriyuki Yamada ,  Katsuaki Shiiki ,  Shinya Takahashi ,  Takashi Kano ,  Yutaka Kurebayashi

IPC分类号： C22C38/00 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/60 ,  C23C8/26 ,  C22C38/18

CPC分类号： C23C8/26 ,  C21D2211/002 ,  C22C38/002 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/60 ,  Y02P10/212

摘要： An object of the present invention is to provide an untempered free-machining steel to be nitrided, not containing Pb, capable of securing a predetermined strength and hardness and having machinability higher than steel containing Pb; and nitrided products. To be more specific, the present invention relates to a bainite-type untempered free-machining steel to be nitrided containing C: 0.05 to 0.8 wt %, Si: 0.01 to 2.5 wt %, Mn: 0.1 to 3.5 wt %, P: 0.001 to 0.2 wt %, S: 0.01 to 0.2 wt %, Cr: 1.0 to 3.5 wt %, V: 0.1 to 0.5 wt %, Al: 0.001 to 0.020 wt %, Ca: 0.0005 to 0.02 wt %, and O: 0.0005 to 0.01 wt % and the residue with an alloy composition of unavoidable impurities and Fe as its basic alloy composition, provided that a content of each of the Mn, the S and the Cr satisfy the formula: ([Mn]−55×[S]/32+[Cr])>2.0, in which an occupation area of a sulfide inclusion present in contact with an oxide inclusion containing 8 to 62 wt % of CaO and containing not less than 1.0 wt % of Ca is not less than 2.0×10−4 mm2 per visual field area of 3.5 mm2. The present invention also relates to a method of manufacturing the above bainite-type untempered free-machining steel to be nitrided and nitrided products manufactured by the said manufacturing method.

摘要翻译： 本发明的目的是提供一种能够确保预定强度和硬度并且具有高于含Pb的钢的切削加工性的未包含Pb的未经回收的自由加工钢; 和氮化产品。 更具体地说，本发明涉及含有C：0.05〜0.8重量％，Si：0.01〜2.5重量％，Mn：0.1〜3.5重量％，P：0.001的氮化的贝氏体型未回火自由加工钢 至0.2重量％，S：0.01〜0.2重量％，Cr：1.0〜3.5重量％，V：0.1〜0.5重量％，Al：0.001〜0.020重量％，Ca：0.0005〜0.02重量％，O：0.0005〜 0.01重量％，残留物中不可避免的杂质和Fe作为其基本合金组成的合金组成，其中Mn，S和Cr各自的含量满足下式：（[Mn] -55x [S] / 32+ [Cr]）> 2.0，其中与含有8至62重量％的CaO并且含有不少于1.0重量％的Ca的氧化物夹杂物存在的硫化物夹杂物的占有面积不小于2.0×10 6， -4> mm 2，视场面积为3.5mm 2。 本发明还涉及一种制造上述贝氏体型未回火自由加工钢的方法，该钢是由所述制造方法制造的氮化和氮化产品。

公开(公告)号：US06582532B1

公开(公告)日：2003-06-24

申请号：US09868308

申请日：2001-09-27

申请人： Yutaka Kurebayashi ,  Sadayuki Nakamura ,  Kiyoyuki Hattori ,  Katsuhiko Kizawa

发明人： Yutaka Kurebayashi ,  Sadayuki Nakamura ,  Kiyoyuki Hattori ,  Katsuhiko Kizawa

IPC分类号： C22C3818

CPC分类号： C22C38/18 ,  C21D8/00 ,  C21D9/40 ,  C22C38/02 ,  C22C38/04 ,  F16C33/30 ,  Y10S148/906 ,  Y10S384/912

摘要： A steel for a large bearing suitable for parts of a large-sized bearing which are excellent in resistance to breakage and rolling fatigue life characteristics, and having a chemical composition by mass percentage of 0.80 to 1.30% of C, more than 0.35% and not more than 0.80% of Si, 0.30 to 0.90% of Mn, 0.90 to 1.50% of Cr, one or both of not more than 0.25% of Mo and 0.20 to 1.50% of Ni, the remainder being Fe and inevitable impurities, and exhibiting the following quench-hardenability measured according to a method specified in JIS G 0561: a HRC of 64 or more at J 1.5 mm, a HRC of 63 to 66 at J 7 mm, a HRC of 37 to 50 at J 15 mm, a HRC of 30 to 45 at J 20 mm, a HRC of 28 to 38 at J 45 mm.

摘要翻译： 适用于大断裂和滚动疲劳寿命特性优异的大型轴承部件的大轴承用钢，其质量百分比为C：0.80〜1.30％，0.35％以上且0.35％以下， Si：0.80％以上，Mn：0.30〜0.90％，Cr：0.90〜1.50％，Mo：0.25％以下，Ni：0.20〜1.50％，Fe：不可避免的杂质和 根据JIS G 0561中规定的方法测定以下淬火淬透性：在J1.5mm下HRC为64以上，J 7mm时HRC为63〜66，J 15mm时HRC为37〜50， HR为30〜45，J为20mm，HR为28〜38，J为45mm。

公开(公告)号：US06203630B1

公开(公告)日：2001-03-20

申请号：US09616362

申请日：2000-07-13

申请人： Yasushi Matsumura ,  Yutaka Kurebayashi ,  Sadayuki Nakamura

发明人： Yasushi Matsumura ,  Yutaka Kurebayashi ,  Sadayuki Nakamura

IPC分类号： C22C3814

CPC分类号： C22C38/50 ,  C22C38/04 ,  C22C38/06 ,  C22C38/54

摘要： A steel product contains, by mass %, C: 0.45 to 0.60%, Si: 0.01 to 0.15%, Mn: 0.20 to 0.60%, S: 0.012% or lower, Al: 0.015 to 0.040%, Ti: 0.005 to 0.050%, B: 0.0005 to 0.0050%, N: 0.010% or lower, O: 0.0010% or lower, and balance being Fe and unavoidable impurities. Limitations are provided to allowable maximum sizes per each sort of contained non-metallic inclusions and the number per unit area thereof. This steel may contains one kind or two kinds or more of Cr: 1.00% or lower, Mo: 0.50% or lower and Ni: 1.50 or lower.

摘要翻译： 钢材以质量％计含有C：0.45〜0.60％，Si：0.01〜0.15％，Mn：0.20〜0.60％，S：0.012％以下，Al：0.015〜0.040％，Ti：0.005〜0.050％ ，B：0.0005〜0.0050％，N：0.010％以下，O：0.0010％以下，余量为Fe和不可避免的杂质。 限制被提供给每种包含的非金属夹杂物的允许最大尺寸及其每单位面积的数量。 该钢可以含有Cr：1.00％以下，Mo：0.50％以下，Ni：1.50以下的一种以上。

公开(公告)号：US5733388A

公开(公告)日：1998-03-31

申请号：US621938

申请日：1996-03-25

申请人： Yutaka Kurebayashi ,  Sadayuki Nakamura ,  Masao Goto ,  Atsuhiko Ohta

发明人： Yutaka Kurebayashi ,  Sadayuki Nakamura ,  Masao Goto ,  Atsuhiko Ohta

IPC分类号： C22C38/22 ,  C21D9/40

CPC分类号： C22C38/22 ,  Y10S148/906

摘要： Bearing steel materials that are superior in cold workability, machinability, hardenability and rolling contact fatigue life are provided. During the processing of steel materials, the generation of large carbides, that detrimentally affect the rolling contact fatigue life of the steel, is inhibited, thereby obviating the necessity of a heat treatment for dissolving the carbides. The present steel material contains the following alloy elements in percentage by mass: 0.55% to 0.82% of carbon; 0.05% to 0.20% of silicon; 0.50% or less of manganese; 0.90% to 1.30% of chromium; 0.05% to 0.30% of molybdenum; and the remaining percentage substantially of iron. After the spheroidizing annealing of the steel material, the total cross-sectional area rate of carbide is 25% or less.

摘要翻译： 提供了在冷加工性，机加工性，淬透性和滚动接触疲劳寿命方面优异的轴承钢材料。 在钢材加工过程中，抑制了对钢的滚动疲劳寿命有不利影响的大碳化物的产生，从而消除了碳化物溶解热处理的必要性。 本钢材以质量％计含有以下合金元素：0.55〜0.82％ 0.05％〜0.20％的硅; 0.50％以下的锰; 0.90〜1.30％的铬; 0.05〜0.30％的钼; 其余的百分比基本上是铁。 在钢材的球化退火之后，碳化物的总横截面积率为25％以下。

公开(公告)号：US20050173026A1

公开(公告)日：2005-08-11

申请号：US10473716

申请日：2002-12-25

申请人： Takao Taniguchi ,  Kazumasa Tsukamoto ,  Kouji Ohbayashi ,  Tomoki Hanyuda ,  Yutaka Kurebayashi ,  Hideo Kanisawa ,  Seiji Itoh

发明人： Takao Taniguchi ,  Kazumasa Tsukamoto ,  Kouji Ohbayashi ,  Tomoki Hanyuda ,  Yutaka Kurebayashi ,  Hideo Kanisawa ,  Seiji Itoh

IPC分类号： C23C8/22 ,  C23C8/80

CPC分类号： C23C8/22 ,  C23C8/80

摘要： A carburizing and hardening method enhances strength while sufficiently reducing hardening strain, without increasing the production cost, and a carburized and hardened member produced thereby. The raw material is an alloy steel which contains Fe as a main component, 0.10 to 0.50 wt. % C and 0.50 to 1.50 wt. % Si and having a hardenability J, based on an end quenching test, in a range of 35 to 50 (at 12.5 mm). After the raw material is formed into the desired shape, a carburized layer is formed by carburizing in an oxidation inhibiting atmosphere. After the carburizing, quenching is performed with cooling, uninterrupted by temperature rise, from a pearlite transformation point (A1 point) to a martensite transformation start point (Ms point), and with a severity of quenching H in a range of 0.01 to 0.08 (cm−1).

摘要翻译： 渗碳硬化方法提高强度，同时充分降低硬化应变，而不增加生产成本，并且由此生产的渗碳硬化构件。 原料是含有Fe作为主要成分的合金钢，0.10〜0.50重量％ ％C和0.50〜1.50wt。 ％Si，并且基于终止淬火试验具有淬透性J，在35〜50（12.5mm）的范围内。 在原料形成所需形状之后，通过在氧化抑制气氛中渗碳形成渗碳层。 渗碳后，从珠光体相变点（A1点）到马氏体相变开始点（Ms点）的冷却不间断地进行淬火淬火，淬火强度H在0.01〜0.08的范围内（ cm -1）。