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1. 发明申请

US20100291407A1 ALLOY TO BE SURFACE-COATED AND SLIDING MEMBERS 失效
标题翻译：合金是表面涂层和滑动成员
公开(公告)号：US20100291407A1
公开(公告)日：2010-11-18
申请号：US12863127
申请日：2009-01-16
申请人： Kenji Yokoyama , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
发明人： Kenji Yokoyama , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
IPC分类号： B32B15/18 , C22C38/22 , C22C38/20 , B32B15/01
CPC分类号： C23C14/0605 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/22 , Y10T428/12972 , Y10T428/12979 , Y10T428/30
摘要： An alloy to be surface-coated, which can keep excellent hardness of 58HRC or above even when the amount of an alloying element added is reduced or even when the alloy is heated to a temperature of as high as 400 to 500° C.; and sliding members produced by forming a hard film on the surface of the alloy. An alloy to be surface-coated, the surface of which is to be covered with a hard film, which alloy contains by mass C: 0.5 to 1.2%, Si: 2.0% or below, Mn: 1.0% or below, Cr: 5.0 to 14.0%, Mo+1/2 W: 0.5 to 5.0%, and N: more than 0.015 to 0.1% with the balance being Fe and impurities, preferably such an alloy which contains by mass C: 0.6 to 0.85%, Si: 0.1 to 1.5%, Mn: 0.2 to 0.8%, Cr: 7.0 to 11.0%, Mo+1/2 W: 1.0 to 4.0%, and N: 0.04 to 0.08%.
摘要翻译：即使在合金元素添加量减少甚至合金加热至400〜500℃的温度时，即使表面被覆的合金也能够保持58HRC以上的优异的硬度。以及通过在合金表面上形成硬质膜而制造的滑动构件。要表面涂覆的合金，其表面将被硬膜覆盖，该合金以C：0.5至1.2％，Si：2.0％或更低，Mn：1.0％或更低，Cr：5.0 至14.0％，Mo + 1 / 2W：0.5〜5.0％，N：大于0.015〜0.1％，余量为Fe和杂质，优选含有C：0.6〜0.85％的Si， 0.1〜1.5％，Mn：0.2〜0.8％，Cr：7.0〜11.0％，Mo + 1 / 2W：1.0〜4.0％，N：0.04〜0.08％。

2. 发明申请

US20120114964A1 COATED-SURFACE SLIDING PART HAVING EXCELLENT COATING ADHESION AND METHOD FOR PRODUCING THE SAME 审中-公开
标题翻译：具有优异涂层粘合性的涂层表面滑动部件及其制造方法
公开(公告)号：US20120114964A1
公开(公告)日：2012-05-10
申请号：US13384092
申请日：2010-07-13
申请人： Fumiaki Honda , Kenji Yokoyama , Kenichi Inoue , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
发明人： Fumiaki Honda , Kenji Yokoyama , Kenichi Inoue , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
IPC分类号： C22C38/22 , B32B15/18 , C23C16/26 , C22C38/60
CPC分类号： C23C14/022 , B32B15/013 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/22 , C23C14/025 , C23C14/0605 , C23C14/165 , Y10T428/12458 , Y10T428/12535
摘要： Provided is a coated-surface sliding part having excellent adhesion of a hard coating, and a method for producing the same part. The coated-surface sliding part is a sliding part wherein a hard coating is formed by physical deposition on the surface of a base material formed from, by mass percent, C 0.5 to 0.8%, Si 0.1 to 1.5%, Mn 0.2 to 1.0%, Cr 8.0 to 13.5%, Mo and/or W 0.5 to 4.0% in terms of (Mo+ 1/2 W), and N 0.01 to 0.1%, with the remainder being Fe and impurities. The physically deposited coating is a titanium metal coating further covered by a diamond-like carbon coating. The method for producing a coated-surface part involves sputtering in order to apply the physically deposited coating, which consists of the titanium metal coating and then the diamond-like carbon coating which forms the surface layer, to the surface of the base material having the aforementioned composition. The base material is preferably subjected to argon gas bombardment prior to application of the physically deposited coating.
摘要翻译：提供了具有优异的硬涂层粘附性的涂布表面滑动部件及其制造方法。涂覆表面滑动部分是滑动部分，其中通过物理沉积形成基体材料表面上的硬质涂层，质量百分比为C 0.5至0.8％，Si 0.1至1.5％，Mn为0.2至1.0％，Cr 8.0〜13.5％，Mo和/或W为0.5〜4.0％（Mo + 1 / 2W），N为0.01〜0.1％，余量为Fe和杂质。物理沉积的涂层是进一步被金刚石状碳涂层覆盖的钛金属涂层。涂覆表面部分的制造方法包括溅射，以将由钛金属涂层和形成表面层的类金刚石碳涂层组成的物理沉积涂层施加到具有表面层的基材的表面上上述组成。在施加物理沉积的涂层之前，优选对基材进行氩气轰击。

3. 发明授权

US08409712B2 Alloy to be surface-coated and sliding members 失效
标题翻译：合金为表面涂层和滑动构件
公开(公告)号：US08409712B2
公开(公告)日：2013-04-02
申请号：US12863127
申请日：2009-01-16
申请人： Kenji Yokoyama , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
发明人： Kenji Yokoyama , Kunichika Kubota , Toshihiro Uehara , Takehiro Ohno , Katsuhiko Ohishi
IPC分类号： B32B9/00
CPC分类号： C23C14/0605 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/22 , Y10T428/12972 , Y10T428/12979 , Y10T428/30
摘要： An alloy to be surface-coated, which can keep excellent hardness of 58HRC or above even when the amount of an alloying element added is reduced or even when the alloy is heated to a temperature of as high as 400 to 500° C.; and sliding members produced by forming a hard film on the surface of the alloy. An alloy to be surface-coated, the surface of which is to be covered with a hard film, which alloy contains by mass C: 0.5 to 1.2%, Si: 2.0% or below, Mn: 1.0% or below, Cr: 5.0 to 14.0%, Mo+1/2 W: 0.5 to 5.0%, and N: more than 0.015 to 0.1% with the balance being Fe and impurities, preferably such an alloy which contains by mass C: 0.6 to 0.85%, Si: 0.1 to 1.5%, Mn: 0.2 to 0.8%, Cr: 7.0 to 11.0%, Mo+1/2 W: 1.0 to 4.0%, and N: 0.04 to 0.08%.
摘要翻译：即使在合金元素添加量减少甚至合金加热至400〜500℃的温度时，即使表面被覆的合金也能够保持58HRC以上的优异的硬度。以及通过在合金表面上形成硬质膜而制造的滑动构件。要表面涂覆的合金，其表面将被硬膜覆盖，该合金以C：0.5至1.2％，Si：2.0％或更低，Mn：1.0％或更低，Cr：5.0 至14.0％，Mo + 1 / 2W：0.5〜5.0％，N：大于0.015〜0.1％，余量为Fe和杂质，优选含有C：0.6〜0.85％的Si， 0.1〜1.5％，Mn：0.2〜0.8％，Cr：7.0〜11.0％，Mo + 1 / 2W：1.0〜4.0％，N：0.04〜0.08％。

4. 发明申请

US20120107169A1 HEAT-RESISTING STEEL FOR ENGINE VALVES EXCELLENT IN HIGH TEMPERATURE STRENGTH 有权
标题翻译：发动机用耐热钢在高温强度下表现优异
公开(公告)号：US20120107169A1
公开(公告)日：2012-05-03
申请号：US13265086
申请日：2010-04-19
申请人： Katsuhiko Ohishi , Takehiro Ohno , Toshihiro Uehara
发明人： Katsuhiko Ohishi , Takehiro Ohno , Toshihiro Uehara
IPC分类号： C22C38/44 , C22C38/48 , C22C38/54 , C22C38/42
CPC分类号： C22C38/44 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/42 , C22C38/48 , C22C38/54 , F01L3/02 , F01L2101/00 , F01L2800/18 , F01L2820/01 , F01L2820/02
摘要： To provide an inexpensive heat-resisting steel for engine valves by causing Fe-based heat-resisting steel to exhibit high temperature strength not inferior to that of Ni-based heat-resisting steel. A heat-resisting steel for engine valves excellent in high temperature strength containing, in % by mass, C: 0.20 to 0.50%, Si: 1.0% or less, Mn: 5.0% or less, P: 0.1 to 0.5%, Ni: 8.0 to 15.0%, Cr: 16.0 to 25.0%, Mo: 2.0 to 5.0%, Cu: 0.5% or less, Nb: 1.0% or less (including 0%), W: 8.0% or less (including 0%), N: 0.02 to 0.2%, B: 0.01% or less, and remnants of Fe and impurities,wherein the heat-resisting steel for engine valves satisfies formulae below: 442P(%)+12Mo(%)+5W(%)+7Nb(%)+328N(%)+171≧300 Formula (1) −38.13P(%)+1.06Mo(%)+0.13W(%)+9.64Nb(%)+13.52N(%)+4.83≧0.12 Formula (2)
摘要翻译：通过使Fe系耐热钢呈现出不劣于Ni系耐热钢的高温强度，为发动机阀提供便宜的耐热钢。 1.一种耐高温发动机用耐热钢，以质量％计含有C：0.20〜0.50％，Si：1.0％以下，Mn：5.0％以下，P：0.1〜0.5％，Ni： 8.0〜15.0％，Cr：16.0〜25.0％，Mo：2.0〜5.0％，Cu：0.5％以下，Nb：1.0％以下（含0％），W：8.0％以下（含0％ N：0.02〜0.2％，B：0.01％以下，Fe和杂质的残留物，其中，发动机气门用耐热钢满足下式：442P（％）+ 12Mo（％）+ 5W（％）+ 7Nb （％）+ 328N（％）+ 171≧300式（1）-38.13P（％）+ 1.06Mo（％）+ 0.13W（％）+ 9.64Nb（％）+ 13.52N（％）+ 4.83≧0.12 公式（2）

5. 发明授权

US08741215B2 Heat-resisting steel for engine valves excellent in high temperature strength 有权
标题翻译：发动机气门用耐热钢，耐高温性能优良
公开(公告)号：US08741215B2
公开(公告)日：2014-06-03
申请号：US13265086
申请日：2010-04-19
申请人： Katsuhiko Ohishi , Takehiro Ohno , Toshihiro Uehara
发明人： Katsuhiko Ohishi , Takehiro Ohno , Toshihiro Uehara
IPC分类号： C22C38/42 , C22C38/44 , C22C38/48
CPC分类号： C22C38/44 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/42 , C22C38/48 , C22C38/54 , F01L3/02 , F01L2101/00 , F01L2800/18 , F01L2820/01 , F01L2820/02
摘要： To provide an inexpensive heat-resisting steel for engine valves by causing Fe-based heat-resisting steel to exhibit high temperature strength not inferior to that of Ni-based heat-resisting steel. A heat-resisting steel for engine valves excellent in high temperature strength containing, in % by mass, C: 0.20 to 0.50%, Si: 1.0% or less, Mn: 5.0% or less, P: 0.1 to 0.5%, Ni: 8.0 to 15.0%, Cr: 16.0 to 25.0%, Mo: 2.0 to 5.0%, Cu: 0.5% or less, Nb: 1.0% or less (including 0%), W: 8.0% or less (including 0%), N: 0.02 to 0.2%, B: 0.01% or less, and remnants of Fe and impurities,wherein the heat-resisting steel for engine valves satisfies formulae below: 442P(%)+12Mo(%)+5W(%)+7Nb(%)+328N(%)+171≧300 Formula (1) −38.13P(%)+1.06Mo(%)+0.13W(%)+9.64Nb(%)+13.52N(%)+4.83≧0.12 Formula (2).
摘要翻译：通过使Fe系耐热钢呈现出不劣于Ni系耐热钢的高温强度，为发动机阀提供便宜的耐热钢。 1.一种耐高温发动机用耐热钢，以质量％计含有C：0.20〜0.50％，Si：1.0％以下，Mn：5.0％以下，P：0.1〜0.5％，Ni： 8.0〜15.0％，Cr：16.0〜25.0％，Mo：2.0〜5.0％，Cu：0.5％以下，Nb：1.0％以下（含0％），W：8.0％以下（含0％ N：0.02〜0.2％，B：0.01％以下，Fe和杂质的残留物，其中，发动机气门用耐热钢满足下式：442P（％）+ 12Mo（％）+ 5W（％）+ 7Nb （％）+ 328N（％）+ 171≧300式（1）-38.13P（％）+ 1.06Mo（％）+ 0.13W（％）+ 9.64Nb（％）+ 13.52N（％）+ 4.83≧0.12 式（2）。

6. 发明授权

US06527879B2 Self-lubricating piston ring material for internal combustion engine and piston ring 有权
公开(公告)号：US06527879B2
公开(公告)日：2003-03-04
申请号：US09884072
申请日：2001-06-20
申请人： Kunichika Kubota , Takehiro Ohno , Yoshiki Masugata
发明人： Kunichika Kubota , Takehiro Ohno , Yoshiki Masugata
IPC分类号： C22C3820
CPC分类号： F16J9/26
摘要： There are disclosed a piston ring material and a piston ring both having such superior properties contradictory each other as the sliding property required in a piston ring and the mechanical properties of a steel wire material subjected to a manufacture process. The piston ring material or the piston ring consists essentially, by mass, of not less than 0.3% but less than 0.8% C, 0.1 to 3.0% Si, 0.1 to 3.0% Mn, 0.03 to 0.3% S, 0.3 to 6.0% Cr, preferably 3.0 to 6.0% or 0.3 to 1.0% Cr, 0 to 3.0% Cu, and the balance Fe, and the distribution state of sulfide inclusions with a maximum diameter/minimum size≧3 observed on structure parallel to the outer peripheral surface of the formed piston ring is such that an intersecting angle made between straight lines passing the maximum size of two of the sulfide inclusions is not more than 30 degrees. Further, the area ratio of nonmetallic inclusions occupying the structure is 2.0% or less, or in addition to the above-described composition, at least one selected from the group consisting of 0.01% or less of Ca, 0.5% or less in total of one or more of V, Nb, Ti, and 1.5% or less of Al is contained.

7. 发明授权

US08444778B2 Low-thermal-expansion Ni-based super-heat-resistant alloy for boiler and having excellent high-temperature strength, and boiler component and boiler component production method using the same 有权
标题翻译：用于锅炉的低热膨胀Ni基超耐热合金并具有优异的高温强度，以及使用其的锅炉部件和锅炉部件生产方法
公开(公告)号：US08444778B2
公开(公告)日：2013-05-21
申请号：US12675688
申请日：2008-08-29
申请人： Toshihiro Uehara , Takehiro Ohno , Akihiro Toji , Takashi Sato , Gang Bao , Shinya Imano , Hiroyuki Doi
发明人： Toshihiro Uehara , Takehiro Ohno , Akihiro Toji , Takashi Sato , Gang Bao , Shinya Imano , Hiroyuki Doi
IPC分类号： C22C19/05 , C22F1/10
CPC分类号： C22C19/055 , C22F1/10 , F28F21/083
摘要： Disclosed is a low-thermal-expansion Ni-based super-heat-resistant alloy for a boiler, which has excellent high-temperature strength. The alloy can be welded without the need of carrying out any aging treatment. The alloy has a Vickers hardness value of 240 or less. The alloy comprises (by mass) C in an amount of 0.2% or less, Si in an amount of 0.5% or less, Mn in an amount of 0.5% or less, Cr in an amount of 10 to 24%, one or both of Mo and W in such an amount satisfying the following formula: Mo+0.5 W=5 to 17%, Al in an amount of 0.5 to 2.0%, Ti in an amount of 1.0 to 3.0%, Fe in an amount of 10% or less, and one or both of B and Zr in an amount of 0.02% or less (excluding 0%) for B and in an amount of 0.2% or less (excluding 0%) for Zr, with the remainder being 48 to 78% of Ni and unavoidable impurities.
摘要翻译：公开了一种用于锅炉的低热膨胀Ni基超耐热合金，其具有优异的高温强度。可以焊接合金，而不需要进行任何时效处理。该合金的维氏硬度值为240以下。该合金含有0.2质量％以下的Si（以质量计），0.5％以下的Si，0.5％以下的Mn，10〜24％的Cr，1种或2种的Mo和W的量满足下式：Mo + 0.5W = 5〜17％，Al为0.5〜2.0％，Ti为1.0〜3.0％，Fe为10％以下的B和Zr中的一种或两种，B的含量为0.02％以下（不包括0％），Zr的含量为0.2％以下（不含0％），余量为48〜78 ％的Ni和不可避免的杂质。

8. 发明申请

US20110171058A1 PROCESS FOR MANUFACTURING NI-BASE ALLOY AND NI-BASE ALLOY 有权
标题翻译：制造NI-BASE合金和NI-BASE合金的工艺
公开(公告)号：US20110171058A1
公开(公告)日：2011-07-14
申请号：US13063414
申请日：2009-09-25
申请人： Chuya Aoki , Toshihiro Uehara , Takehiro Ohno
发明人： Chuya Aoki , Toshihiro Uehara , Takehiro Ohno
IPC分类号： C22C19/05 , C21D11/00 , C22F1/10
CPC分类号： C22B9/04 , C22B9/18 , C22B9/20 , C22B23/06 , C22C19/055 , C22F1/02 , C22F1/10
摘要： Provided is an Ni-base alloy excellent in strength, ductility and other properties through the resolution of micro-segregation. Also provided is a process for manufacturing an Ni-base alloy containing by mass C: 0.15% or less, Si: 1% or less, Mn: 1% or less, Cr: 10 to 24%, Mo+(½)W (where Mo may be contained either alone or as an essential component): 5 to 17%, Al: 0.5 to 1.8%, Ti: 1 to 2.5%, Mg: 0.02% or less, and either B: 0.02% or less and/or Zr: 0.2% or less at an Al/(Al+0.56Ti) ratio of 0.45 to 0.70 with the balance consisting of Ni and impurities, which comprises subjecting, at least one time, an Ni-base alloy material which is prepared by vacuum melting and has the above composition to homogenization heat treatment at 1160 to 1220° C. for 1 to 100 hours. The Mo segregation ratio of the alloy is controlled to 1 to 1.17 by the homogenization heat treatment.
摘要翻译：提供了通过分离微分离而具有优异的强度，延展性等特性的Ni基合金。还提供了以质量计C：0.15％以下，Si：1％以下，Mn：1％以下，Cr：10〜24％，Mo +（1/2）W（其中， Mo可以单独或作为必要成分含有）：5〜17％，Al：0.5〜1.8％，Ti：1〜2.5％，Mg：0.02％以下，B：0.02％以下和/或 Zr：在Al /（Al + 0.56Ti）比为0.45〜0.70的情况下为0.2％以下，余量由Ni和杂质组成，其中包括至少一次将真空制备的Ni基合金材料熔化并具有上述组成以在1160至1220℃进行均化热处理1至100小时。通过均质化热处理将合金的Mo偏析比控制在1〜1.17。

9. 发明授权

US06447624B2 Manufacturing process of nickel-based alloy having improved hot sulfidation-corrosion resistance 有权
标题翻译：具有改善的耐热硫化 - 耐腐蚀性的镍基合金的制造方法
公开(公告)号：US06447624B2
公开(公告)日：2002-09-10
申请号：US09825948
申请日：2001-04-05
申请人： Toshiaki Nonomura , Takehiro Ohno , Toshihiro Uehara , Hiroshi Yakuwa , Matsuho Miyasaka , Shuhei Nakahama , Shigeru Sawada
发明人： Toshiaki Nonomura , Takehiro Ohno , Toshihiro Uehara , Hiroshi Yakuwa , Matsuho Miyasaka , Shuhei Nakahama , Shigeru Sawada
IPC分类号： C22F110
CPC分类号： C22C19/055 , C22C19/056 , C22F1/10
摘要： A manufacturing method, particularly a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C. and not higher than 760° C. for 4 to 48 hours.
摘要翻译：特别是具有耐腐蚀性高的设备的组件的耐硫化性的Ni基合金的热处理方法，即Waspaloy（United Technologies的商标）或其改进的Ni基合金，其中可以提高合金的高温耐硫化腐蚀性，同时保持热强度性能。用于该方法的Ni基合金主要由0.005至0.1％的C，18至21％的Cr，12至15％的Co，3.5至5.0％的Mo，不超过3.25％的Ti和1.2至4.0％的Al（表达以质量百分比表示），余量基本上包含Ni。在具有改善的耐硫化腐蚀性的Ni基合金的制造方法中，在固溶热处理之后，合金在不低于860℃且不高于920℃的温度下进行稳定处理1 至16小时，并在不低于680℃且不高于760℃的温度下老化处理4至48小时。

10. 发明授权

US06776956B2 Steel for separators of solid-oxide type fuel cells 有权
标题翻译：用于固体氧化物型燃料电池分离器的钢
公开(公告)号：US06776956B2
公开(公告)日：2004-08-17
申请号：US10132571
申请日：2002-04-26
申请人： Toshihiro Uehara , Akihiro Toji , Takehiro Ohno
发明人： Toshihiro Uehara , Akihiro Toji , Takehiro Ohno
IPC分类号： C22C3818
CPC分类号： H01M8/0204 , C22C38/004 , C22C38/005 , C22C38/06 , C22C38/50 , H01M8/021 , H01M8/0228 , H01M8/0232
摘要： Provided is a steel for separators of solid-oxide type fuel cells, which forms oxide films having good electrical conductivity at 700 to 950° C. or so, has good oxidation resistance and, in particular, resistance to exfoliation even in the case of long hours of use, is excellent in impact properties at room temperature, shows a small difference in thermal expansion from the electrolyte, and is inexpensive. This steel for separators of solid-oxide fuel cells includes, by mass %, not more than 0.2% C, not more than 1.0% Si, not more than 1.0% Mn, not more than 2% Ni, 15 to 30% Cr, not more than 1% Al, one or more elements selected from the group of not more than 0.5% Y, not more than 0.2% REM and not more than 1% Zr, and the balance of Fe and unavoidable impurities. In this steel, amounts of S, O, N and B in the unavoidable impurities are restricted to not more than 0.015%, not more than 0.010%, not more than 0.050% and not more than 0.0050%, respectively, the following equation is satisfied: (0+2S)/(0.27Y+0.035Zr+0.16REM)≦2.0, Furthermore, in this steel, the hardness is not more than 280 HV and the average ferrite grain size number is not less than ASTM No. 2, which provides fine grains.
摘要翻译：本发明提供一种固体氧化物型燃料电池用隔板的钢，其形成在700〜950℃左右的导电性良好的氧化膜，具有良好的抗氧化性，特别是长时间耐剥离性使用时间小，室温下的冲击性优异，与电解质的热膨胀差异小，成本低廉。用于固体氧化物型燃料电池用隔板的钢中，以质量％计不超过0.2％C，1.0％以下的Si，1.0％以下的Mn，2％以下的Ni，15〜30％的Cr，不大于1％的Al，选自不超过0.5％Y，不超过0.2％REM和不超过1％Zr的一种或多种元素，余量为Fe和不可避免的杂质。在这种钢中，不可避免的杂质中的S，O，N和B的量分别限制在不大于0.015％，不大于0.010％，不大于0.050％和不大于0.0050％，下面的等式是满意：此外，在该钢中，硬度为280HV以下，平均铁素体晶粒尺寸数不小于提供细晶粒的ASTM No.2。

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