公开(公告)号：US06547890B2

公开(公告)日：2003-04-15

申请号：US09829768

申请日：2001-04-10

申请人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

发明人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

IPC分类号： C21D806

CPC分类号： C21D9/525 ,  C21D1/32 ,  C21D8/06 ,  C22C38/04 ,  C22C38/06

摘要： The present invention provides a steel wire rod for cold forging which can be spheroidizing-annealed in an as hot-rolled state without requiring preliminary drawing and can have high ductility after the spheroidizing annealing, and a method to produce the same: and is characterized in that; the steel contains, by weight, 0.1 to 0.5% of C, 0.01 to 0.5% of Si and 0.3 to 1.5% of Mn, with the balance consisting of Fe and unavoidable impurities, and further contains hardening elements as required; and the steel has a prior austenite grain size number, defined under Japanese Industrial Standard (JIS) G 0551, of 11 or higher, the amount of diffusible hydrogen in the steel measured by the programmed temperature gas chromatography being 0.2 ppm or less, and the hardness being Hv 250 to 700. The production method is characterized by: hot rolling the steel at a low temperature; rapidly cooling and tempering the wire rod thus rolled by holding it in a furnace atmosphere controlled in the temperature range of 300 to 600° C. for 15 min. or longer but shorter than 1 h.; and then applying spheroidizing annealing as required.

公开(公告)号：US06475306B1

公开(公告)日：2002-11-05

申请号：US09829741

申请日：2001-04-10

申请人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

发明人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

IPC分类号： C22C3804

CPC分类号： C21D8/065 ,  C21D8/06 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44

摘要： The present invention provides a hot rolled steel wire rod or bar for machine structural use having, even when a spheroidizing annealing time is reduced, cold workability equal to that of the wire rods or bars treated through conventional spheroidizing annealing of a long treatment time, as a result of controlling a metallographic structure, and a method to produce the same: and relates to a hot rolled steel wire rod or bar for machine structural use, characterized in that; the wire rod or bar is made from a steel consisting of, in weight, 0.1 to 0.5% of C, 0.01 to 0.5% of Si, 0.3 to 1.5% of Mn, and the balance comprising Fe and unavoidable impurities and containing hardening elements as required; its microstructure consists of ferrite and pearlite; its ferrite crystal grain size number defined under Japanese Industrial Standard (JIS) G 0552 is 11 or higher; the granular carbide 2 &mgr;m or less in circle-equivalent diameter and having an aspect ratio of 3 or less accounts for a percentage area of 3 to 15%; and its hardness (Hv) satisfies the expression below, 165 Ceq+73.5≦Hv≦195 Ceq+73.5 (where, Ceq=C%+1/7 Si%+1/5 Mn%+1/9 Cr%).

摘要翻译： 本发明提供一种用于机械结构用途的热轧钢线材棒，即使当球化退火时间降低时，与通过长处理时间的常规球化退火处理的线棒或棒的冷加工性等同于， 控制金相结构的结果及其制造方法：涉及一种用于机械结构用途的热轧钢线材或棒材，其特征在于： 线材或棒材由钢组成，其重量为C：0.1〜0.5％，Si：0.01〜0.5％，Mn：0.3〜1.5％，余量由Fe和不可避免的杂质构成，含有硬化元素 需要; 其微结构由铁素体和珠光体组成; 日本工业标准（JIS）G 0552规定的铁素体晶粒尺寸数为11以上; 圆当量直径为2μm或更小，纵横比为3或更小的颗粒状碳化物占3％至15％的百分比面积; 其硬度（Hv）满足下式（Ceq = C％+ 1 / 7Si％+ 1 / 5Mn％+ 1 / 9Cr％）。

公开(公告)号：US06551419B2

公开(公告)日：2003-04-22

申请号：US09829742

申请日：2001-07-06

申请人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

发明人： Hideo Kanisawa ,  Tatsuro Ochi ,  Manabu Kubota ,  Koji Tanabe ,  Kiichiro Tsuchida

IPC分类号： C22C3802

CPC分类号： C21D8/06 ,  C21D7/13 ,  C21D9/5732 ,  C21D2211/003 ,  C21D2211/005

摘要： The present invention provides a hot rolled steel wire rod or bar for machine structural use having, in the as-hot-rolled condition, cold workability equal to that of the conventional wire rods or bars softened through annealing after hot rolling, and a method to produce the same: and relates to a hot rolled steel wire rod or bar for machine structural use, characterized in that; the wire rod or bar is made from a steel consisting of, in weight, 0.1 to 0.5% of C, 0.01 to 0.5% of Si, 0.3 to 1.5% of Mn, and the balance comprising Fe and unavoidable impurities and containing strengthening elements as required; its microstructure consists of ferrite and pearlite; its ferrite crystal grain size number defined under Japanese Industrial Standard (JIS) G 0552 is 11 or higher; and a granular carbide 2 &mgr;m or less in circle-equivalent diameter and having an aspect ratio of 3 or less accounts for a percentage area of 3 to 15%.

摘要翻译： 本发明提供一种用于机械结构用途的热轧钢线材或棒材，其在热轧条件下具有与通过热轧后退火软化的常规线材或棒材相当的冷加工性能，以及 制造相同的材料：涉及用于机械结构用途的热轧钢线材或棒材，其特征在于： 线材或棒材由重量为0.1〜0.5％的C，0.01〜0.5％的Si，0.3〜1.5％的Mn，余量由Fe和不可避免的杂质构成的钢制成，含有强化元素为 需要; 其微结构由铁素体和珠光体组成; 日本工业标准（JIS）G 0552规定的铁素体晶粒尺寸数为11以上; 圆周当量直径为2μm以下，长径比为3以下的粒状碳化物占3〜15％的面积的比例。

公开(公告)号：US06261388B1

公开(公告)日：2001-07-17

申请号：US09314733

申请日：1999-05-18

申请人： Manabu Kubota ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Atsushi Murakami ,  Masao Ishida

发明人： Manabu Kubota ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Atsushi Murakami ,  Masao Ishida

IPC分类号： C22C3832

CPC分类号： C22C38/32 ,  C21D8/06 ,  C21D2211/004 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

摘要： A cold forging steel excellent in grain coarsening prevention and delayed fracture resistance and method of producing the same are provided that enable omission of a step of annealing or spheroidization annealing before cold forging and improvement of delayed fracture resistance of a high-strength component used with a heat-treated surface. The cold forging steel is a steel of a specified composition having dispersed in the matrix thereof particles of not greater than 0.2 &mgr;m diameter of one or more of TiC, Ti(CN), NbC, Nb(CN) and (Nb, Ti)(CN) in a total number of not less than 20/100 &mgr;m2. The method of producing a cold forging steel includes the steps of heating this steel to not lower than 1050° C., hot-rolling the steel into steel wire or steel bar, and slowly cooling the steel at a cooling rate of not greater than 2 C./s during cooling to a temperature not higher than 600° C. to obtain a steel having dispersed in the matrix thereof particles of not greater than 0.2 &mgr;m diameter of one or more of TiC, Ti(CN), NbC, Nb(CN) and (Nb, Ti)(CN) in a total number of not less than 20/100 &mgr;m2.

摘要翻译： 提供了一种具有优异的晶粒粗化防止和延迟耐断裂性的冷锻钢及其制造方法，其能够在冷锻之前省略退火或球化退火步骤，并且提高使用的高强度组分的延迟耐断裂性 热处理表面。 冷锻钢是具有规定组成的钢，其分散在其基体中，TiC，Ti（CN），NbC，Nb（CN）和（Nb，Ti）（的一种或多种）的直径不大于0.2μm的颗粒 CN）总数不少于20/100 mum2。 制造冷锻钢的方法包括以下步骤：将钢加热至1050℃以上，将钢热轧成钢丝或钢棒，以不大于2的冷却速度缓慢冷却钢 在冷却至不高于600℃的温度下进行C./s，以获得分散在其基质中的钢，TiC，Ti（CN），NbC，Nb（的一种或多种）的直径不超过0.2μm的颗粒 CN）和（Nb，Ti）（CN），总数不小于20/100mum2。

公开(公告)号：US06488787B1

公开(公告)日：2002-12-03

申请号：US09763363

申请日：2001-02-15

申请人： Tatsuro Ochi ,  Hideo Kanisawa ,  Manabu Kubota ,  Koji Adachi ,  Ryuichi Seki

发明人： Tatsuro Ochi ,  Hideo Kanisawa ,  Manabu Kubota ,  Koji Adachi ,  Ryuichi Seki

IPC分类号： C21D806

CPC分类号： C22C38/32 ,  C21D1/32 ,  C21D8/06 ,  C21D2211/003 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/18 ,  C22C38/28

摘要： A machine structural steel bar or wire having a softening degree of at least that of the conventional spheroidization-annealed steel material, excellent hardenability, and improved cold workability, comprising 0.1 to 0.5 wt % of C, 0.01 to 0.15 wt % of Si, 0.2 to 1.7 wt % of Mn, 0.0005 to 0.05 wt % of Al, 0.005 to 0.07 wt % of Ti, 0.0003 to 0.007 wt % of B, 0.002 to 0.02 wt % of N and the balance of Fe and unavoidable impurities, the unavoidable impurities including up to 0.02 wt % of P and up to 0.003 wt % of O, and having a microstructure comprising ferrite and spheroidal carbides, the ferritic grain size number according to JIS G0522 of the ferrite being at least No. 8 and the number of the spheroidal carbides per unit area mm2 being up to 1.5×106×C wt %.

摘要翻译： 软化度至少为常规球化退火钢材料的机械结构钢棒或线材，淬火性优异，冷加工性提高，其中，C：0.1〜0.5重量％，Si：0.01〜0.15重量％，Si：0.2 至1.7重量％的Mn，0.0005至0.05重量％的Al，0.005至0.07重量％的Ti，0.0003至0.007重量％的B，0.002至0.02重量％的N，余量为Fe和不可避免的杂质，不可避免的杂质 包括至多0.02重量％的P和至多0.003重量％的O，并且具有包含铁素体和球形碳化物的微结构，根据JIS G0522的铁素体晶粒尺寸数目至少为8号，球形数 每单位面积mm2的碳化物达到1.5×10 6×C wt％。

公开(公告)号：US20110155290A1

公开(公告)日：2011-06-30

申请号：US13061023

申请日：2010-01-13

申请人： Kei Miyanishi ,  Masayuki Hashimura ,  Shuuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

发明人： Kei Miyanishi ,  Masayuki Hashimura ,  Shuuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

IPC分类号： C21D9/52 ,  C22C38/18 ,  C22C38/08 ,  C22C38/00 ,  C23C22/78

CPC分类号： C22C38/02 ,  B21J1/02 ,  C21D1/32 ,  C21D1/58 ,  C21D6/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0257 ,  C21D9/32 ,  C21D9/36 ,  C21D9/38 ,  C21D9/40 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  F16C33/62

摘要： This case hardening steel has a chemical composition including, by mass %: C: 0.1 to 0.6%; Si: 0.02 to 1.5%; Mn: 0.3 to 1.8%; P: 0.025% or less; S: 0.001 to 0.15%; Al: over 0.05 to 1.0%; Ti: 0.05 to 0.2%; N: 0.01% or less; and O: 0.0025% or less, and further including, by mass %, one or more of Cr: 0.4 to 2.0%, Mo: 0.02 to 1.5%, Ni: 0.1 to 3.5%, V: 0.02 to 0.5%, and B: 0.0002 to 0.005%, and the balance consisting of iron and unavoidable impurities.

摘要翻译： 该硬化钢的化学成分按质量％计含有：C：0.1〜0.6％ Si：0.02〜1.5％ Mn：0.3〜1.8％ P：0.025％以下; S：0.001〜0.15％ Al：0.05〜1.0％ Ti：0.05〜0.2％ N：0.01％以下 和O：0.0025％以下，进一步包括Cr：0.4〜2.0％，Mo：0.02〜1.5％，Ni：0.1〜3.5％，V：0.02〜0.5％中的一种或多种，​​B： ：0.0002〜0.005％，余量由铁和不可避免的杂质组成。

公开(公告)号：US08673094B2

公开(公告)日：2014-03-18

申请号：US13696714

申请日：2011-10-05

申请人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

发明人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

IPC分类号： C22C38/28

CPC分类号： C22C38/00 ,  C21D1/18 ,  C21D9/28 ,  C21D9/32 ,  C21D9/40 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2261/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28 ,  C23C8/22

摘要： A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 μm per 1 mm2 and a mass percentage [S] of S satisfy: d≦500×[S]+1.

摘要翻译： 表面硬化钢以质量％计含有C：0.1〜0.5％，Si：0.01〜1.5％，Mn：0.3〜1.8％，S：0.001〜0.15％，Cr：0.4〜2.0％，Ti ：0.05〜0.2％，Al：0.2％以下，N：0.0050％以下，P：0.025％以下，O：0.0025％以下，余量为Fe 杂质，其中当量圆直径大于5um / 1mm 2的硫化物的数量d和S的质量百分比[S]满足：d @ 500×[S] +1。

公开(公告)号：US20120018063A1

公开(公告)日：2012-01-26

申请号：US13138837

申请日：2009-10-14

申请人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

发明人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

IPC分类号： C21D8/00 ,  C22C38/38 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/32 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50 ,  C22C38/54 ,  C22C38/28 ,  C22C38/24

CPC分类号： C21D1/06 ,  C21D8/0226 ,  C22C1/002 ,  C22C1/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/46 ,  C22C38/48 ,  C23C8/32 ,  C23C8/80

摘要： Cold worked, machined, and carburized quenched case-hardened steel prevented from formation of coarse grains, that is, case-hardened steel superior in cold workability, machinability, and fatigue characteristics after carburized quenching characterized by limiting, by mass %, S: 0.001 to 0.15%, Ti: 0.05 to 0.2%, Al: 0.04% or less, and N: 0.0050% or less, containing other specific ingredients in specific ranges, furthermore containing one or more of Mg: 0.003% or less, Zr: 0.01% or less, and Ca: 0.005% or less, limiting the amount of precipitation of AlN to 0.01% or less, and having a density d (/mm2) of sulfides with a equivalent circle diameter of over 20 μm and an aspect ratio of over 3 and a content of S [S] (mass %) satisfying d≦1700[S]+20.

摘要翻译： 冷加工，机加工和渗碳淬火的硬化钢防止形成粗晶粒，即在渗碳淬火后的冷加工性，机械加工性和疲劳特性优异的表面硬化钢，其特征在于以质量％S：0.001 至0.15％，Ti：0.05〜0.2％，Al：0.04％以下，N：0.0050％以下，含有特定范围的其他特定成分，进一步含有Mg：0.003％以下，Zr：0.01 ％以下，Ca：0.005％以下，将AlN的析出量限制在0.01％以下，并且具有当量圆直径大于20μm的硫化物的密度d（/ mm2），纵横比 3以上，S [S]（质量％）的含量满足d＆nlE; 1700 [S] +20。

公开(公告)号：US08980022B2

公开(公告)日：2015-03-17

申请号：US13061023

申请日：2010-01-13

申请人： Kei Miyanishi ,  Masayuki Hashimura ,  Shuuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

发明人： Kei Miyanishi ,  Masayuki Hashimura ,  Shuuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

IPC分类号： C21D9/52 ,  C21D8/02 ,  C21D9/00 ,  C22C38/08 ,  C22C38/44 ,  C22C38/22 ,  C22C38/00 ,  C23C8/32 ,  C23C8/26 ,  C23C8/30 ,  C23C8/24 ,  C23C8/20 ,  C22C38/02 ,  B21J1/02 ,  C21D6/00 ,  C21D9/32 ,  C21D9/36 ,  C21D9/38 ,  C21D9/40 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  F16C33/62 ,  C21D1/32 ,  C21D1/58

CPC分类号： C22C38/02 ,  B21J1/02 ,  C21D1/32 ,  C21D1/58 ,  C21D6/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0257 ,  C21D9/32 ,  C21D9/36 ,  C21D9/38 ,  C21D9/40 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  F16C33/62

摘要： This case hardening steel has a chemical composition including, by mass %: C: 0.1 to 0.6%; Si: 0.02 to 1.5%; Mn: 0.3 to 1.8%; P: 0.025% or less; S: 0.001 to 0.15%; Al: over 0.05 to 1.0%; Ti: 0.05 to 0.2%; N: 0.01% or less; and O: 0.0025% or less, and further including, by mass %, one or more of Cr: 0.4 to 2.0%, Mo: 0.02 to 1.5%, Ni: 0.1 to 3.5%, V: 0.02 to 0.5%, and B: 0.0002 to 0.005%, and the balance consisting of iron and unavoidable impurities.

摘要翻译： 该硬化钢的化学成分按质量％计含有：C：0.1〜0.6％ Si：0.02〜1.5％ Mn：0.3〜1.8％ P：0.025％以下; S：0.001〜0.15％ Al：0.05〜1.0％ Ti：0.05〜0.2％ N：0.01％以下 和O：0.0025％以下，进一步包括Cr：0.4〜2.0％，Mo：0.02〜1.5％，Ni：0.1〜3.5％，V：0.02〜0.5％中的一种或多种，​​B： ：0.0002〜0.005％，余量由铁和不可避免的杂质组成。

公开(公告)号：US20130048156A1

公开(公告)日：2013-02-28

申请号：US13696714

申请日：2011-10-05

申请人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

发明人： Masayuki Hashimura ,  Kei Miyanishi ,  Shuji Kozawa ,  Manabu Kubota ,  Tatsuro Ochi

IPC分类号： C22C38/28 ,  C22C38/58 ,  C22C38/38 ,  C22C38/50 ,  C21D8/00 ,  C22C38/32

CPC分类号： C22C38/00 ,  C21D1/18 ,  C21D9/28 ,  C21D9/32 ,  C21D9/40 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2261/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/28 ,  C23C8/22

摘要： A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 μm per 1 mm2 and a mass percentage [S] of S satisfy: d 500×[S]+1.

摘要翻译： 表面硬化钢以质量％计含有C：0.1〜0.5％，Si：0.01〜1.5％，Mn：0.3〜1.8％，S：0.001〜0.15％，Cr：0.4〜2.0％，Ti ：0.05〜0.2％，Al：0.2％以下，N：0.0050％以下，P：0.025％以下，O：0.0025％以下，余量为Fe 杂质，其中当量圆直径大于5μm/ 1mm 2的硫化物的数量d和S的质量百分比[S]满足：d 500×[S] +1。