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    Steels, steel products for nitriding, nitrided steel parts
    11.
    发明授权
    Steels, steel products for nitriding, nitrided steel parts 失效
    钢，氮化钢产品，氮化钢零件

    公开(公告)号：US6083455A

    公开(公告)日：2000-07-04

    申请号：US2881

    申请日：1998-01-05

    Applicant: Masato Kurita ,  Koji Watari ,  Toru Kato ,  Harunori Kakimi ,  Mitsuo Uno ,  Masanori Sakamoto ,  Yoshihiko Kamada

    Inventor： Masato Kurita ,  Koji Watari ,  Toru Kato ,  Harunori Kakimi ,  Mitsuo Uno ,  Masanori Sakamoto ,  Yoshihiko Kamada

    IPC: C22C38/00 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60 ,  C23C8/26 ,  C22C38/02

    CPC classification number: C23C8/26 ,  C22C38/002 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/60

    Abstract: The present invention relates to manufacturing methods of nitrided steel parts, having high tensile strength, high fatigue strength, and excellent bending roughness, through nitriding without thermal refining, to thus-manufactured steel parts, and to steel products for nitriding, and steels for nitriding having a specific chemical composition, serving as steel stock for the manufacture of such steel parts. The chemical composition is as follows: C: over 0.20 to 0.60%, Si: 0.05 to 1.0%, Mn: 0.20 to 1.50%, P: 0.08% or less, S: 0.005 to 0.10%, Cu: 0.30% or less, Ni: 0.30% or less, Cr: 0.30% or less, Mo: 0.30% or less, V: 0.20% or less, Nb: 0.05% or less, Ti: 0.003 to 0.03%, Al: 0.08% or less, Ca: 0.005% or less, Pb: 0.30% or less, N: 0.008 to 0.030%, and the balance of Fe and unavoidable impurities. Steel products preferably have the ferrite-pearlite microstructure having a ferrite percentage of not less than 10%. Nitrided steel parts are formed from the steel products serving as steel stock therefor, and have a nitrided case formed in the surface portion thereof.

    Abstract translation: 本发明涉及氮化钢部件的制造方法，具有高拉伸强度，高疲劳强度，优异的弯曲粗糙度，通过不进行热精炼的氮化，制造的钢部件，氮化用钢产品和氮化用钢 具有特定的化学成分，用作制造这种钢部件的钢坯。 化学成分如下：C：0.20〜0.60％，Si：0.05〜1.0％，Mn：0.20〜1.50％，P：0.08％以下，S：0.005〜0.10％，Cu：0.30％以下， Ni：0.30％以下，Cr：0.30％以下，Mo：0.30％以下，V：0.20％以下，Nb：0.05％以下，Ti：0.003〜0.03％，Al：0.08％以下，Ca ：0.005％以下，Pb：0.30％以下，N：0.008〜0.030％，余量为Fe和不可避免的杂质。 优选钢铁产品的铁素体 - 珠光体组织的铁素体比例不小于10％。 氮化钢部件由用作钢坯的钢制品形成，并且在其表面部分形成有氮化的外壳。

    Method of evaluating ceramics
    12.
    发明授权
    Method of evaluating ceramics 失效
    评估陶瓷的方法

    公开(公告)号：US5217305A

    公开(公告)日：1993-06-08

    申请号：US867876

    申请日：1992-04-13

    Applicant: Akira Yamakawa ,  Masaya Miyake ,  Kozo Ishizaki ,  Koji Watari

    Inventor： Akira Yamakawa ,  Masaya Miyake ,  Kozo Ishizaki ,  Koji Watari

    IPC: G01N25/20 ,  G01N25/00 ,  G01N33/38

    CPC classification number: G01N25/005 ,  G01N33/388

    Abstract: For evaluating mechanical properties of ceramics such as silicon nitride in a nondestructive manner, a specific heat of ceramic test samples to be evaluated is measured at a temperature not higher than room temperature. A comparison is made between a measured value of the specific heat of the test sample and a known value of a specific heat of a ceramic reference sample at the same temperature not higher than room temperature. The comparison, permits making conclusions regarding the mechanical properties of the ceramic test samples based on the known mechanical properties of the ceramic reference sample. The creep strength is given as one example of the mechanical properties that may be ascertained by a nondestructive inspection that may be part of a production line, whereby the mechanical properties of the individual ceramic products may be guaranteed in practice.

    Low-carbon free cutting steel
    14.
    发明申请
    Low-carbon free cutting steel 审中-公开
    低碳自由切割钢

    公开(公告)号：US20050025658A1

    公开(公告)日：2005-02-03

    申请号：US10898963

    申请日：2004-07-27

    Applicant: Naoki Matsui ,  Takayuki Nishi ,  Toru Kato ,  Koji Watari ,  Tatsuya Hasegawa

    Inventor： Naoki Matsui ,  Takayuki Nishi ,  Toru Kato ,  Koji Watari ,  Tatsuya Hasegawa

    IPC: C22C38/00 ,  C22C38/04 ,  C22C38/14 ,  C22C38/60

    CPC classification number: C22C38/02 ,  C22C38/04

    Abstract: The invention provides a low-carbon free cutting steel containing no lead and is at least comparable in machinability to the conventional leaded free cutting steels and composite free cutting steels and furthermore has excellent finished surface characteristics. The steel is a low-carbon free cutting steel which comprises, on the percent by mass basis, C: 0.05 to under 0.20%, Mn: 0.4-2.0%, S: 0.21-1.0%, Ti: 0.002-0.10%, P: 0.001-0.30%, Al: not higher than 0.2%, 0: 0.001-0:03% and N: 0.0005-0.02%, with the balance being Fe and impurities, and which satisfies the relations (a) and (b) given below concerning the inclusions contained in the steel: (A+B)/C≧0.8   (a), NA≧5   (b), wherein, A: the total area occupied by substantial MnS with Ti carbide and/or Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; B: the total area occupied by substantial MnS with neither Ti carbide nor Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; C: the total area occupied by all the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling; NA: the number of substantial MnS inclusions with Ti carbide and/or Ti carbonitride included therein among the inclusions not smaller than 1 μm in circle-equivalent diameter per mm2 of a cross section parallel to the direction of rolling.

    Abstract translation: 本发明提供一种不含铅的低碳自由切削钢，至少与常规的含铅自由切削钢和复合自由切削钢的切削性相当，并且还具有优异的成品表面特性。 该钢是低碳自由切削钢，以质量％计含有C：0.05〜0.20％以下，Mn：0.4〜2.0％，S：0.21〜1.0％，Ti：0.002〜0.10％，P ：0.001-0.30％，Al：不高于0.2％，0：0.001-0：03％和N：0.0005-0.02％，余量为Fe和杂质，满足关系式（a）和（b） 对于包含在钢中的夹杂物：（A + B）/ C> = 0.8（a），NA> = 5（b），其中，A：实质MnS与Ti碳化物和/或Ti 夹杂物中包含的碳氮化物在与轧制方向平行的截面中每平方毫米的圆当量直径不小于1微米; B：平均于轧制方向的横截面的平均当量直径不小于1μm的夹杂物中不含Ti碳化物和Ti碳氮化物的实质MnS所占的总面积; C：与轧制方向平行的截面的每平方毫米的圆当量直径不小于1um的所有夹杂物占据的总面积; NA：夹杂物中含有Ti碳化物和/或Ti碳氮化物的实质MnS夹杂物的数量不小于平均于轧制方向的横截面的平均当量直径为1毫米2的横截面。

    Steel products excellent in machinability and machined steel parts
    18.
    发明授权
    Steel products excellent in machinability and machined steel parts 失效
    机械加工性优良的钢制品，机加工钢件

    公开(公告)号：US5922145A

    公开(公告)日：1999-07-13

    申请号：US103566

    申请日：1998-06-24

    Applicant: Koji Watari ,  Yasutaka Okada

    Inventor： Koji Watari ,  Yasutaka Okada

    IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

    CPC classification number: C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14

    Abstract: The present invention is directed to steel products which exhibit excellent machinability and are suitable for steel stocks of structural steel parts for a variety of machinery, such as transportation machinery including automobiles, machinery for industrial use, construction machinery, and the like; as well as to a variety of machined structual steel parts for machinery such as crankshafts, connecting rods, gears, and the like. The steel products of the present invention are endowed with excellent machinability and have the following composition based on % by weight: C: 0.05% to 0.6%; S: 0.002% to 0.2%; Ti: 0.04% to 1.0%; N: 0.008% or less; Nd: 0% to 0.1%; Se: 0% to 0.5%; Te: 0% to 0.05%; Ca: 0% to 0.01%; Pb: 0% to 0.5%; and Bi: 0% to 0.4%; wherein the maximum diameter of titanium carbosulfide contained in the steel is not greater than 10 .mu.m, and its amount expressed in the index of cleanliness of the steel is equal to or more than 0.05%. The machined parts, according to the present inventions are manufactured by subjecting the steel products of the invention to a machining process, and are useful as structural steel parts for a variety of machinery, such as transportation machinery including automobiles, machinery for industrial use, construction machinery, and the like.

    Abstract translation: 本发明涉及具有优异的机械加工性的钢制品，适用于各种机械的结构钢部件的钢种，例如包括汽车的运输机械，工业用机械，工程机械等; 以及用于诸如曲轴，连杆，齿轮等的机械的各种加工结构钢部件。 本发明的钢制品具有优异的机械加工性，并且具有以重量％计的以下组成：C：0.05％至0.6％; S：0.002〜0.2％; Ti：0.04〜1.0％ N：0.008％以下; Nd：0〜0.1％ Se：0％〜0.5％; Te：0％〜0.05％; Ca：0〜0.01％ Pb：0〜0.5％ 和Bi：0％至0.4％; 其中包含在该钢中的碳硫化钛的最大直径不大于10μm，并且其以钢的清洁度表示的量等于或大于0.05％。 根据本发明的加工部件通过对本发明的钢制品进行加工而制造，并且可用作各种机械的结构钢部件，例如包括汽车的运输机械，工业用机械，结构 机械等。

    Method of producing silicon nitride ceramics having thermal high conductivity
    19.
    发明授权
    Method of producing silicon nitride ceramics having thermal high conductivity 失效
    具有导热性高的氮化硅陶瓷的制造方法

    公开(公告)号：US5902542A

    公开(公告)日：1999-05-11

    申请号：US766317

    申请日：1996-12-13

    Applicant: Kiyoshi Hirao ,  Koji Watari ,  Motohiro Toriyama ,  Syuzo Kanzaki ,  Masaaki Obata

    Inventor： Kiyoshi Hirao ,  Koji Watari ,  Motohiro Toriyama ,  Syuzo Kanzaki ,  Masaaki Obata

    IPC: C04B35/584 ,  C04B35/593 ,  C04B35/638 ,  C04B35/64 ,  C04B35/645

    CPC classification number: C04B35/5935

    Abstract: The present invention provides silicon nitride ceramics having high thermal conductivity and a method for production thereof. This invention relates to a method for producing a silicon nitride sintered body having a microstructure with silicon nitride crystals oriented uniaxially and exhibiting high thermal conductivity of 100 to 150 W/mK in the direction parallel to the orientation direction of the crystals, which comprises of preparing a slurry by mixing a mixed powder of a sintering auxiliary, beta-silicon nitride single crystals as seed crystals and a silicon nitride raw powder with a dispersing medium, forming the slurry by tape casting or extrusion forming, calcining the formed silicon nitride body with beta-silicon nitride single crystals oriented parallel to the casting plane to remove the organic components, densifying it by hot pressing and the like if required, and further annealing it at 1700 to 2000.degree. C. under the nitrogen pressure of 1 to 100 atmospheres.

    Abstract translation: 本发明提供了具有高导热性的氮化硅陶瓷及其制造方法。 本发明涉及一种具有氮化硅结构的氮化硅烧结体的制造方法，该氮化硅烧结体具有在与晶体取向方向平行的方向上单轴取向并具有100〜150W / mK的高导热率的微结构， 通过将烧结助剂，β-氮化硅单晶的混合粉末作为晶种和氮化硅原料粉末与分散介质混合来形成浆料，通过带状流延或挤出成型形成浆料，用β - 氮化硅单晶，其平行于铸造平面取向以去除有机组分，如果需要，通过热压等来致密化，并且在1〜100个大气压的氮气压力下，在1700〜2000℃进一步退火。

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