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：US06866724B2

公开(公告)日：2005-03-15

申请号：US10168650

申请日：2000-12-22

申请人： Tatsuro Ochi ,  Hideo Kanisawa ,  Ken-ichiro Naito

发明人： Tatsuro Ochi ,  Hideo Kanisawa ,  Ken-ichiro Naito

IPC分类号： C21D8/06 ,  C21D1/32 ,  C21D9/52 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/60 ,  C22C38/02

CPC分类号： C21D9/525 ,  C21D1/32 ,  C21D8/06 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2211/009 ,  C22C38/002 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22

摘要： A bar or wire product for use in cold forging, characterized in that it comprises a steel having the chemical composition, in mass %: C: 0.1 to 0.6%, Si: 0.01 to 0.5%, Mn: 0.2 to 1.7%, S: 0.001 to 0.15%, Al: 0.015 to 0.05%, N: 0.003 to 0.025%, P: 0.035% or less, O: 0.003% or less and balance: Fe and inevitable impurities, and it has, in the region from the surface thereof to the depth of the radius thereof×0.15, a structure wherein ferrite accounts for 10 area % or less and the balance is substantially one or more of martensite, bainite and pearlite, and the average hardness in the region from the depth of the radius thereof×0.5 to the center thereof is less than that of the surface layer thereof by 20 or more of HV; and a method for producing the bar or wire product. The bar or wire product is excellent in the ductility after spheroidizing and thus allows the prevention of occurrence of cracks in a steel product during cold forging, which has conventionally been a problem in manufacturing structural parts for a machine by cold forging.

摘要翻译： 一种用于冷锻的棒材或线材制品，其特征在于它包括质量％：C：0.1至0.6％，Si：0.01至0.5％，Mn：0.2至1.7％的化学成分的钢，S： 0.001〜0.15％，Al：0.015〜0.05％，N：0.003〜0.025％，P：0.035％以下，O：0.003％以下，余量：Fe和不可避免的杂质， 其半径为x0.15的深度，其中铁素体占10面积％以下，余量基本上为马氏体，贝氏体和珠光体的一种以上，从半径方向的区域的平均硬度 其中心部分的中心部分的表面层的厚度小于HV的20以上; 以及用于制造棒材或线材制品的方法。 棒材或线材制品在球化后的延展性优异，因此能够防止在冷锻期间的钢制品中产生裂纹，这在制造冷锻机械的结构部件时一直存在问题。

公开(公告)号：US06602358B1

公开(公告)日：2003-08-05

申请号：US09442490

申请日：1999-11-18

申请人： Tatsuro Ochi ,  Hideo Kanisawa ,  Kenichiro Naito ,  Joji Tamura ,  Masayoshi Saga

发明人： Tatsuro Ochi ,  Hideo Kanisawa ,  Kenichiro Naito ,  Joji Tamura ,  Masayoshi Saga

IPC分类号： C22C3814

CPC分类号： F16D3/2237 ,  C21D1/10 ,  C21D9/0068 ,  C21D9/40 ,  C22C38/12 ,  C22C38/14 ,  C22C38/60 ,  F16D2250/00 ,  F16D2300/10 ,  Y02P10/253

摘要： Disclosed are an outer race for a constant velocity joint, having improved anti-flaking properties and shaft strength, and a process for producing the same. The outer race for a constant velocity joint includes a cup and a serration and comprises by weight carbon: 0.45 to 0.59%, silicon: 0.15 to 0.4%, manganese: 0.15 to 0.45%, sulfur: 0.005 to 0.15%, molybdenum: 0.1 to 0.35%, boron: 0.0005 to 0.005%, aluminum: 0.015 to 0.05%, and titanium: 0.015 to 0.03%, the proportion of the effective case depth in track grooves of the cup being 0.25 to 0.45 in terms of the ratio of the effective case depth t to the wall thickness of the cup w, t/w, the proportion of the effective case depth of the involute serration in its end being 0.20 to 0.50 in terms of the ratio of the effective case depth t to the radius r, t/r. The involute serration in its end preferably has a former austenite grain size of not less than 8 in terms of the grain size number specified in JIS (Japanese Industrial Standards).

摘要翻译： 公开了一种用于等速万向节的外圈，具有改进的抗剥离性能和轴强度，以及制造该等离子体的方法。 用于等速万向节的外圈包括一个杯子和一个锯齿，并且包括重量百分比：0.45至0.59％，硅：0.15至0.4％，锰：0.15至0.45％，硫：0.005至0.15％，钼：0.1至 0.35％，硼：0.0005〜0.005％，铝：0.015〜0.05％，钛：0.015〜0.03％，杯的轨道槽的有效壳深度的比例为0.25〜0.45 表壳深度t相对于杯的壁厚w t / w，渐开线锯齿的有效壳体深度的比例在有效壳深度t与半径r之比为0.20至0.50时， t / r。 其渐开线锯齿末优选以JIS（日本工业标准）规定的粒径数以前的奥氏体晶粒尺寸不小于8。

公开(公告)号：US06383311B1

公开(公告)日：2002-05-07

申请号：US09442506

申请日：1999-11-18

申请人： Tatsuro Ochi ,  Hideo Kanisawa ,  Kenichiro Naito ,  Joji Tamura ,  Masayoshi Saga

发明人： Tatsuro Ochi ,  Hideo Kanisawa ,  Kenichiro Naito ,  Joji Tamura ,  Masayoshi Saga

IPC分类号： C22C3814

CPC分类号： C21D9/28 ,  C21D1/10 ,  C22C38/22 ,  C22C38/28 ,  C22C38/60 ,  Y02P10/253

摘要： Disclosed are a high strength drive shaft and a process for producing the same. The high strength drive shaft comprises as a steel material, by weight, carbon: 0.48 to 0.58%, silicon: 0.01 to 0.15%, manganese: 0.35 to 0.75%, sulfur: 0.005 to 0.15%, molybdenum: 0.1 to 0.35%, boron 0.0005 to 0.005%, aluminum: 0.015 to 0.05%, and titanium: 0.02 to 0.08%, the proportion of the effective case depth of an involute serration in its end of the drive shaft being 0.3 to 0.7 in terms of the ratio of the effective case depth t to the radius r, t/r. The involute serration in its end preferably has a former austenite grain size of not less than 8 in terms of the grain size number specified in JIS (Japanese Industrial Standards). A steel comprising the above constituents and having a hardness of 85 to 95 HRB is machined and form rolled into a shaft, and the shaft is induction hardened and then tempered at 120 to 200° C. to produce the high strength drive shaft.

摘要翻译： 公开了一种高强度驱动轴及其制造方法。 高强度驱动轴包括碳钢，重量比为0.48〜0.58％，硅：0.01〜0.15％，锰：0.35〜0.75％，硫：0.005〜0.15％，钼：0.1〜0.35％，硼 0.0005〜0.005％，铝：0.015〜0.05％，钛：0.02〜0.08％，驱动轴端部的渐开线锯齿的有效壳深度的比例为0.3〜0.7 情况深度t到半径r，t / r。 其渐开线锯齿末优选以JIS（日本工业标准）规定的粒径数以前的奥氏体晶粒尺寸不小于8。 将包含上述成分并且具有85至95HRC的硬度的钢加工并卷成轴，并将该轴进行感应淬火，然后在120至200℃下回火以产生高强度驱动轴。

公开(公告)号：US20060137766A1

公开(公告)日：2006-06-29

申请号：US11319871

申请日：2005-12-27

申请人： Shuji Kozawa ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Tomoko Serikawa ,  Koki Mizuno

发明人： Shuji Kozawa ,  Tatsuro Ochi ,  Hideo Kanisawa ,  Tomoko Serikawa ,  Koki Mizuno

IPC分类号： C22C38/22 ,  C22C38/24 ,  C23C8/22 ,  C23C8/32

CPC分类号： C23C8/22 ,  C23C8/32

摘要： The present invention provides case-hardening steel superior in tooth surface fatigue strength and a gear using the same used for parts of automobiles, construction machines, industrial machines, etc., that is case-hardening steel superior in tooth surface fatigue strength containing, by wt %, C: 0.1 to 0.3%, Si: 1.0 to 2.0%, Mn: 0.3 to 2.0%, S: 0.005 to 0.05%, Cr: 1.0 to 2.6%, Mo: 0.8 to 4.0%, V: 0.1 to 0.3%, Al: 0.001 to 0.2%, and N: 0.003 to 0.03%, limiting P to 0.03% or less, and having as a balance iron and unavoidable impurities, and satisfies the following expression, 31Si (%)+15Mn (%)+23Cr (%)+26Mo (%)+100V (%) is 100 or more, and a gear comprised of case-hardening steel and having an X-ray diffraction half width at a depth of 50 mm from the surface of the gear of 6.4 degrees or more.

摘要翻译： 本发明提供了表面疲劳强度优异的表面硬化钢和使用其用于汽车，工程机械，工业机械等部件的齿轮，其是表面硬化钢，其表面疲劳强度优异，包括由 重量％，C：0.1〜0.3％，Si：1.0〜2.0％，Mn：0.3〜2.0％，S：0.005〜0.05％，Cr：1.0〜2.6％，Mo：0.8〜4.0％，V：0.1〜 ％，Al：0.001〜0.2％，N：0.003〜0.03％，将P限制在0.03％以下，余量为铁和不可避免的杂质，满足下式：31Si（％）+ 15Mn（％） + 23Cr（％）+ 26Mo（％）+ 100V（％）为100以上，由外壳硬化钢构成的齿轮与齿轮表面的距离为50mm的X射线衍射半值宽度 为6.4度以上。

公开(公告)号：US06602359B1

公开(公告)日：2003-08-05

申请号：US09914128

申请日：2001-08-22

申请人： Tatsuro Ochi ,  Hideo Kanisawa ,  Ken-ichiro Naito

发明人： Tatsuro Ochi ,  Hideo Kanisawa ,  Ken-ichiro Naito

IPC分类号： C22C3802

CPC分类号： C22C38/28 ,  C21D1/32 ,  C21D8/06 ,  C21D9/525 ,  C21D2221/10 ,  C22C38/04 ,  C22C38/06 ,  C22C38/32

摘要： The present invention provides a steel bar or wire rod for cold forging excellent in ductility after spheroidizing annealing and capable of preventing the occurrence of cracking in the steel material during cold forging, which cracking has so far been a problem when manufacturing machine structural components by cold forging, and a method to produce the same. Specifically, a steel bar or wire rod for cold forging according to the present invention has a chemical composition comprising, in mass, 0.1 to 0.65% of C, 0.01 to 0.5% of Si, 0.2 to 1.7% of Mn, 0.001 to 0.15% of S, 0.015 to 0.1% of Al, 0.0005 to 0.007% of B, and the restricted elements of 0.035% or less of P, 0.01% or less of N and 0.003% or less of O, with the balance consisting of Fe and unavoidable impurities, and is characterized in that: the area percentage of ferrite structure is 10% or less at the portion from the surface to the depth of 0.15 time the radius of the steel bar or wire rod; the other portion consists substantially of one or more of martensite, bainite and pearlite; and further the average hardness of the portion from the depth of 0.5 time its radius to its center is less than the hardness of its surface layer (the portion from the surface to the depth of 0.15 times the radius) by HV 20 or more.

摘要翻译： 本发明提供一种用于在球化退火后具有优异的延展性的冷锻钢筋或线材，并且能够防止在冷锻期间钢材中发生裂纹，但是当制冷机构结构部件被冷却时，这是迄今为止的一个问题 锻造及其制造方法。 具体地说，根据本发明的用于冷锻的钢筋或线材具有以下组成的化学成分：质量分数为C：C：0.01〜0.5％，Si：0.01〜0.5％，Mn：0.2〜1.7％，0.001〜0.15％ 的S，0.015〜0.1％的Al，0.0005〜0.007％的B，限制元素为0.035％以下的P，0.01％以下的N和0.003％以下的O，余量由Fe和 不可避免的杂质，其特征在于，在钢筋或线材的半径的表面到深度的0.15倍的部分，铁素体组织的面积百分比为10％以下; 另一部分基本上由马氏体，贝氏体和珠光体中的一种或多种组成; 并且从半径的0.5倍的深度到其中心的部分的平均硬度小于其表面层（表面到半径的0.15倍的部分）的硬度为HV20以上。