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1. 发明专利

JP2002356738A HIGH CONTACT PRESSURE RESISTANT MEMBER AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002356738A
公开(公告)日：2002-12-13
申请号：JP2001160694
申请日：2001-05-29
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： KUREBAYASHI YUTAKA , KIMURA TOSHIMITSU , YAMAGUCHI TAKUO , OTANI KEIZO , UCHIYAMA NORIKO
IPC分类号： C21D6/00 , C22C38/00 , C22C38/22 , C22C38/46
摘要： PROBLEM TO BE SOLVED: To provide a high contact pressure resistant member having excellent surface fatigue strength owing to finely and uniformly precipitated M23 C6 -type carbides, and also to provide a method for manufacturing the high contact pressure resistant member by which the M23 C6 -type carbides is precipitated finely and uniformly in an intermediate step and resultantly the surface fatigue strength of the member is greatly improved. SOLUTION: In raising the temperature of steel for machine structural use in which C content is made to 0.6-1.5% or surface C content is enriched to 0.6-1.5% by a carburizing treatment or a carbonitriding treatment to an intermediate temperature of 600-750 deg.C, the steel is heated through the temperature range of 500-650 deg.C at (0.2 to 30) deg.C/min temperature-rise rate, held successively within the intermediate temperature range, then held at a temperature not lower than the Ac1 transformation temperature and not higher than the A cm transformation temperature, and quenched for hardening.

2. 发明专利

JP2002339054A HIGH PRESSURE-RESISTANT MEMBER AND MANUFACTURING METHOD 失效
公开(公告)号：JP2002339054A
公开(公告)日：2002-11-27
申请号：JP2001148517
申请日：2001-05-17
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： KUREBAYASHI YUTAKA , KIMURA TOSHIMITSU , YAMAGUCHI TAKUO , OTANI KEIZO , UCHIYAMA NORIKO
IPC分类号： C23C8/22 , C21D1/06 , C21D1/18 , C22C38/00 , C22C38/22 , C23C8/32
摘要： PROBLEM TO BE SOLVED: To provide a high pressure-resistant member in which residual hydrogen can be reduced even when a carburizing or carbonitriding treatment using converted gas is applied and delayed fracture and reduction in bending fatigue strength and rolling fatigue strength due to hydrogen embitterment can be prevented, and also to provide a method for manufacturing the high pressure- resistant member. SOLUTION: Surface C quantity of the member is enriched to 0.6-1.5% by the gas carburizing or gas carbonitriding treatment, and then the member is kept at a temperature not higher than the Ac1 transformation temperature under a reduced pressure to reduce hydrogen. Successively, heating are continued at a temperature not lower than the Ac1 transformation temperature, followed by quenching to undergo hardening.

3. 发明专利

JPS62227558A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPS62227558A
公开(公告)日：1987-10-06
申请号：JP7129086
申请日：1986-03-31
申请人： DAIDO STEEL CO LTD
发明人： OTSUGA DENJIRO , SUZUKI KIYOSHI , YAMAGUCHI TAKUO
IPC分类号： B22D11/10 , B22D11/103 , B22D41/50
摘要： PURPOSE:To promote cooling solidification of the center part by stirring molten steel and to obtain a casting slab having good surface quality, by arranging a submerged nozzle as closing at the bottom end face and as boring at least one pouring hole at the side wall near the bottom end face and pouring the molten steel into a cooling mold as rotating the submerged nozzle arround the axis. CONSTITUTION:The molten steel 32 is poured and supplied into a tundish 10 and poured into the cooling mold 13 through a tundish nozzle 12 and the submerged nozzle 14. Then, a rotation of the driving motor 25 is transmitted to the submerged nozzle 14, which is rotated at the prescribed number of rotation. Therefore, the molten steel 32, too is poured as rotating and the molten steel in the cooling mold 13 is stirred, and the molten steel in the cooling mold 13 is stirred, and the heat radiation to the wall face of the cooing mold 13 is promoted to quicken formation of the solidifying phase. And, inclusions on the casting slab 15 surface are decreased by the centrifugal force. Further, casting powder 35 charged on the molten surface 15a is floated up as slaggy state to isolate the molten surface 15a from the air, slab 15 to lubricate, and so drawing is easily operated.

4. 发明专利

JP2004027305A Case hardening member for rolling part 审中-公开
公开(公告)号：JP2004027305A
公开(公告)日：2004-01-29
申请号：JP2002186668
申请日：2002-06-26
申请人： Daido Steel Co Ltd , Nissan Motor Co Ltd , 大同特殊鋼株式会社 , 日産自動車株式会社
发明人： KIMURA TOSHIMITSU , OTANI KEIZO , UCHIYAMA NORIKO , YAMAGUCHI TAKUO , KINO NOBUO
IPC分类号： F16H55/06 , C22C38/00 , C22C38/48 , C22C38/54 , F16H15/38
摘要： PROBLEM TO BE SOLVED: To provide a case hardening member for a rolling part with which variation in the rolling fatigue strength of the part can be reduced without promoting the formation of network coarse carbides on the surface of the part in the process of carburizing, or the formation of a film blocking the carburizing can be prevented, and the concentration of the carbon on the surface thereof can be set to an objective value.
SOLUTION: The case hardening member for a rolling part consists of steel having a composition comprising, by mass, 0.15 to 0.40% C, 0 to 1.50% Si, 0 to 4.50% Ni, 0.85 to 3.0% Cr and 0.15 to 2.0% Mo, and in which the condition of Cr+Mo:2.5 to 4.0% or Si+Ni:1.50 to 5.0% is satisfied, and the balance Fe with inevitable impurities, and the content of Nb is controlled to

5. 发明专利

JPH04270038A METHOD AND JIG FOR CLEANING LONG NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH04270038A
公开(公告)日：1992-09-25
申请号：JP3098191
申请日：1991-02-26
申请人： DAIDO STEEL CO LTD
发明人： YAMAGUCHI TAKUO , KODAMA KATSUSUKE
IPC分类号： B22D11/10 , B22D43/00
摘要： PURPOSE:To remotely, efficiently and safely remove a deposited metal on the inner wall of a long nozzle used between a ladle and a tundish. CONSTITUTION:At the time of cleaning the long nozzle 13 for continuous casting flowing out molten metal in the ladle into the tundish from a molten metal flowing-out hole 130 after flowing from the molten metal flowing-in hole 13b in the long nozzle 13, an oxygen flowing-out hole 25e is provided on the upper end of long nozzle 13 and also a jig 25 for cleaning providing a hose connecting hole 25d for connecting a hose 26 for supplying the oxygen, is set, and the oxygen supplied from the hose 26 for supplying the oxygen is made flow out into the long nozzle 13 from the oxygen flowing-out hole 25e and metal deposited on the inner wall in the long nozzle 13 is removed.

6. 发明专利

JPH01215445A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH01215445A
公开(公告)日：1989-08-29
申请号：JP3908688
申请日：1988-02-22
申请人： DAIDO STEEL CO LTD
发明人： YAMAGUCHI TAKUO , MATSUURA KURAZO
IPC分类号： B22D11/10 , B22D11/108 , B22D11/11 , B22D11/111 , B22D11/112 , B22D11/116
摘要： PURPOSE:To restrain sticking or growth of solidified metal and to obtain a cast slab having high quality by covering molten metal surface in a mold with exothermic agent at the time of continuously casting. CONSTITUTION:The exothermic agent 41 is added on the molten metal surface in the mold 31, to cover the molten metal surface with it. By this method, the exothermic agent 41 itself has heat insulating effect and inconvenient temp. lowering of the molten metal surface can be prevented. Therefore, the sticking or the growth of solidified metal on outer circumferential part of a submerged nozzle 22 can be restrained. By this method, the cast slab having high quality can be produced.

7. 发明专利

JP2002348615A HIGH BEARING PRESSURE RESISTANT MEMBER AND MANUFACTURING METHOD THEREFOR 失效
公开(公告)号：JP2002348615A
公开(公告)日：2002-12-04
申请号：JP2001149844
申请日：2001-05-18
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： KUREBAYASHI YUTAKA , KIMURA TOSHIMITSU , YAMAGUCHI TAKUO , OTANI KEIZO , UCHIYAMA NORIKO
IPC分类号： C23C8/22 , C21D1/06 , C21D6/00 , C21D9/32 , C21D9/40 , C22C38/00 , C22C38/22
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a high bearing pressure resistant member, which carburizes a low C material into high concentration, further prevents the growth of carbide by controlling its generation, and prevents degradation of the surface fatigue strength, and to provide a high bearing pressure resistance member, having finely and uniformly precipitated carbide on the surface layer and excellent in the rolling fatigue life. SOLUTION: This method comprises vacuum carburizing a steel for a machine structure (the first carburization), which includes, for instance, 0.15-0.40% C, 1.2-3.2% Cr, and 0.25-2.0% Mo, vacuum diffusing the surface C at a solid solution temperature of carbide, for instance, at 900-1050 deg.C, to make the surface C quantity after the treatment to be 0.5-0.7%, and lowering the temperature from the above vacuum diffusion temperature to a quenching temperature of 870-920 deg.C, for instance, at a cooling rate of 1-10 deg.C/min, for instance, to increase the C concentration on the material surface to 0.7-1.0%, for instance, by diffusing carbon during holding it at the above quenching temperature.

8. 发明专利

JPH10168540A PRODUCTION OF NON-HEAT TREATED STEEL FOR CONNECTING ROD AND CONNECTING ROD 失效
公开(公告)号：JPH10168540A
公开(公告)日：1998-06-23
申请号：JP33127396
申请日：1996-12-11
申请人： DAIDO STEEL CO LTD , NISSAN MOTOR
发明人： INOUE KOICHIRO , NAKAMURA SADAYUKI , YAMAGUCHI TAKUO , ITAKURA KOJI , USUKI HIDEKI
IPC分类号： F16C7/00 , C22C38/00 , C22C38/24 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To recover the proportional limit (proof stress) and fatigue strength, deteriorated by cold coining after hot forging, by means of artificial aging and natural aging under a service environment and to provide a connecting rod having proportional limit (proof stress) and fatigue strength both higher than those before coining. SOLUTION: A non-heat treated steel, having a composition consisting of 0.20-0.50% C, 0.05-1.00% Si, 0.10-1.50% Mn, 0.10-1.00% Cr, 0.10-0..50% V, 0.010-0.025% N, further one or >=2 kinds among

9. 发明专利

JPH07164133A SLIDING NOZZLE FOR MOLTEN STEEL VESSEL 失效
公开(公告)号：JPH07164133A
公开(公告)日：1995-06-27
申请号：JP31529693
申请日：1993-12-15
申请人： DAIDO STEEL CO LTD
发明人： YAMAGUCHI TAKUO
IPC分类号： B22D41/28 , B22D11/10 , B22D41/32
摘要： PURPOSE:To prevent the entrapment of the air into molten steel caused by sucking the air from gap between nozzle plates, in a sliding nozzle arranged at the bottom part of a molten metal vessel. CONSTITUTION:At the bottom part of the molten steel vessel 1, an upper side fixing nozzle plate 21, an intermediate side sliding nozzle plate 22 and a lower side fixing nozzle plate 23 having a penetrating hole for forming a molten steel passage in each nozzle plate, are arranged by piling up to form the sliding nozzle 2 enabling the formation of the molten steel flowing passage 24. Then seal material for sealing the inner part of the molten steel flowing passage 24 from the outside is interposed between the fixing nozzle plates 21, 23 and the sliding nozzle plate 22 so as to surround the penetrating hole for forming the molten steel flowing passage at least at the time of flowing down the molten steel. By this constitution, the air contamination in the molten steel can be reduced.

10. 发明专利

JP2002348636A STEEL FOR CARBURIZATION 审中-公开
公开(公告)号：JP2002348636A
公开(公告)日：2002-12-04
申请号：JP2002051519
申请日：2002-02-27
申请人： NISSAN MOTOR , DAIDO STEEL CO LTD
发明人： UCHIYAMA NORIKO , YAMAGUCHI TAKUO , KINO NOBUO , OTANI KEIZO , KIMURA TOSHIMITSU
IPC分类号： C22C38/00 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a steel for carburization suitable for such uses as a power transmission component, which can keep a high surface fatigue strength even when used in temperatures between semi-high and high temperature (in the order of 100-300 deg.C), and under hydrogen-generating environment. SOLUTION: The steel for carburization suitable for such uses as the power transmission component includes, by wt.%, 0.15-0.40% C, 0.50-1.50% Si, 0.20-1.50% Mn, 0.40-4.50% Ni, 1.50-3.0% Cr, and 0.50-2.0% Mo, and one or more from 0.05-0.40% V; 0.03-0.20% Ti, 0.03-0.15% Nb, 0.01-0.10% Al, and 0.0005-0.0030% B, and the balance Fe with unavoidable impurities.

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