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1. 发明专利

JPH06192791A WORKING ROLL FOR MULTISTAGE ROLLING AND ITS PRODUCTION 失效
公开(公告)号：JPH06192791A
公开(公告)日：1994-07-12
申请号：JP34689792
申请日：1992-12-25
申请人： HITACHI LTD , HITACHI MATERIAL ENG KK
发明人： ERA MASAYUKI , UCHIDA TETSUO , KONDO YASUO , YASUDA TAKESHI , SHIMOTAMURA OSAMU , KIKUHARA TAKASHI
IPC分类号： B21B27/00 , C21D9/38 , C22C38/00 , C22C38/52
摘要： PURPOSE:To provide a hardened roll for a multistage rolling mill having high hardness and high wear resistance and excellent in dimple resistance by means of high temp. tempering. CONSTITUTION:The working roll for multistage rolling mill is composed of a high alloy steel having a composition consisting of, by weight, 2.45-4% C, 1-2.5% Si, 0.6-2% Mn, 0.3-1.5% Ni, 6-8% Cr, >11-15% Mo, 10-20% W, 5-10% V, 12-16% Co, and the balance essentially Fe and is formed by performing hardening and tempering. By this method, the hardness of this roll is regulated to >=HRC68 and increased by >=HRC2 as compared with conventional high V-high speed tool steel and high Mo-high Co high speed tool steel, and further, wear resistance and dimple resistance can be improved by >=2 folds and i1.3 folde respectively.

2. 发明专利

JPH05311334A 失效
公开(公告)号：JPH05311334A
公开(公告)日：1993-11-22
申请号：JP11888992
申请日：1992-05-12
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KONDO YASUO , UCHIDA TETSUO , YASUDA TAKESHI , KODAMA HIDEYO , SHIMOTAMURA OSAMU , SAGAWA KUNINORI
IPC分类号： B21B27/00 , C21D6/00 , C21D8/00 , C21D9/38 , C22C38/00 , C22C38/52 , C22C38/58
摘要： PURPOSE:To provide a hardened roll for rolling having high hardness and excellent in toughness, wear resistance and dimple resistance. CONSTITUTION:The objective hardened roll for rolling is formed by subjecting allay steel (the material in this invention) contg. at least one kind among, by weight, 1.6 to 2.5% C, 2 to 3% Si, 0.8 to 3% Mn, 0.5 to 3% Ni, 13 to 18% Cr, 1 to 4% Mo, 0.5 to 2.5% W, 0.9 to 3.5% V, 2 to 5% Co, =64.5 HRC hardness, and in which the hardness is increased by 5 degrees in HRC, wear resistance by 1.2 times, deflective strength showing toughness by 1.5 times and dimple resistance by >=1.2 times as well compared with a one constituted of the conventional material SKD 11.

3. 发明专利

JPH02205656A QUENCHED ROLL FOR ROLLING 失效
公开(公告)号：JPH02205656A
公开(公告)日：1990-08-15
申请号：JP2071689
申请日：1989-02-01
申请人： HITACHI LTD
发明人： ERA MASAYUKI , KONDO TETSUO , UCHIDA TETSUO , KODAMA HIDEYO , FUKUSHIMA MASATAKE , SHIMIZU MASAMI , SHIMOTAMURA OSAMU
IPC分类号： B21B27/00 , C21D8/00 , C21D9/38 , C22C38/00 , C22C38/54
摘要： PURPOSE:To obtain the quenched roll for rolling in which even a thick roll can sufficiently be quenched by air cooling and furthermore having high hardness and excellent wear resistance and toughness by regulating the compositional critical value in the roll and particularly compositely adding Mn, Ni, Zr and B thereto in the specified range. CONSTITUTION:The quenched roll for rolling having the compsn. constituted of, by weight, 0.7 to 1.2% C, 1.1 to 2% Si, 3.5 to 5.5% Cr, 4.5 to 5.5% Mo, 1.5 to 5% W, 1.5 to 3% V, 4 to 6% Co, 1.1 to 5% Mn, 2.1 to 5% Ni, 0.1 to 0.5% Zr, 0.001 to 0.05% B and the balance Fe with inevitable impurities and furthermore compositely added with Mn, Ni, Zr and B so as to satisfy 3 =40mm diameter can sufficiently be quenched, cracks are not generated as well and the quenchability can drastically be improved.

4. 发明专利

JPH01317606A CONJUGATED ROLL FOR ROLLING AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH01317606A
公开(公告)日：1989-12-22
申请号：JP14813588
申请日：1988-06-17
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , KODAMA HIDEYO , SHIMOTAMURA OSAMU
IPC分类号： B21B27/00
摘要： PURPOSE:To prevent the accident by intervention of an oxide system by thermally spraying powders having wear resistance and spalling resistance under a reduced pressure to the cylindrical part of an arbor, then coating said part with a canning material under the reduced pressure, subjecting this part to plastic working and finally removing the coating material. CONSTITUTION:The powders 11, 11' for forming a thermally sprayed layer 6 are housed in powder feeders 9, 9' and further, a coating material 14 for coating the roll stock is housed in a powder feeder 13. After the inside of the device is reduced in pressure, a thermally spraying torch 8 is moved upward and downward as shown by arrows (b) and the thermally sprayed layer 6 and the coating material layer part are formed by using gaseous Ar/H2 under the reduced pressure. The powder supply is thereafter stopped and the coating material surfaces is heated to melt by the flame of the thermally spraying torch; thereafter, the surface is subjected to swaging under heating and the scanning material part is removed by lathing. The material is then subjected to a prescribed heat treatment and the product is obtd.

5. 发明专利

JPS6450320A MANUFACTURE OF OXIDE SUPERCONDUCTIVE WIRE 失效
公开(公告)号：JPS6450320A
公开(公告)日：1989-02-27
申请号：JP20635087
申请日：1987-08-21
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , YOSHINARI AKIRA , MORIMOTO SHOGO
IPC分类号： H01B12/04 , B28B1/00 , H01B13/00
摘要： PURPOSE:To eliminate the dispersion of a superconductive characteristic by melting the row material of an oxide superconductor with oxygen blowing, making the raw material quenchably solidified, then applying a heat treatment in an oxygen atmosphere, and making wire drawing while filled into a metallic pipe. CONSTITUTION:An oxide system superconductive material is mixed so that, for instance, each oxide of Y2O3, BaO, and CuO has the ratio of Y:Ba:Cu=1:2:3 in the mole ratio, and melted and maintained at 1550 deg.C in a melting furnace having an oxygen blowing function. A sufficient oxygen is uniformly supplied with an excessive oxygen made to be enriched and quenched in the melted state (retragonal system). By the way, an oxygen quantity in melting and maintaining mentioned above is 1.0kg/cm and a flow rate is 5l/min., quenching produces a quenched powder by double belt method. Then the powder is heat treated in an oxygen atmosphere at 850-950 deg.C, filled into a silver pipe having an outer diameter of 1mm and an inner diameter of 0.6mm, and a wire drawing process is made.

6. 发明专利

JPS6443921A MANUFACTURE OF OXIDE SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS6443921A
公开(公告)日：1989-02-16
申请号：JP19980087
申请日：1987-08-12
申请人： HITACHI LTD
发明人： ARATO TOSHIAKI , UCHIDA TETSUO , YOSHINARI AKIRA
IPC分类号： C04B35/00 , C01G1/00 , C04B35/45 , C25D13/02 , H01B12/06 , H01B13/00 , H01L39/24
摘要： PURPOSE:To make it possible to effectively manufacture oxide superconductive materials in, for instance, a tape-state or a linear state by coating raw material powders of oxide superconductive materials on the surface of conductive substances having various shapes by the electrophoresis method. CONSTITUTION:A powder body in which prescribed quantity of raw material powders of oxide superconductive materials are uniformly mixed is made to be dispersed in a mixed solvent of alcohol and water, furthermore, at least one or more kinds of chloride, nitrate, sulphate, and acetate having at least one or more kinds of a positive ion component in components of oxide superconductive materials are melted in the mixed solvent, oxide superconductive materials are coated to conductive substances by the electrophoresis coating method, and then heat treated. This makes it possible to manufacture oxide superconductive materials having various shapes, and particularly long size coils and sheets etc., are continuously manufactured because the electrophoresis coating method is used.

7. 发明专利

JPS6254165B2 失效
公开(公告)号：JPS6254165B2
公开(公告)日：1987-11-13
申请号：JP20166081
申请日：1981-12-16
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , AKAHORI KIMIHIKO
IPC分类号： C22B9/10 , C21C7/00 , C21C7/04 , C21C7/064

8. 发明专利

JPS62227550A PRODUCTION OF INGOT 失效
公开(公告)号：JPS62227550A
公开(公告)日：1987-10-06
申请号：JP6834886
申请日：1986-03-28
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , KODAMA HIDEYO , YAMAGUCHI TOSHIYUKI
IPC分类号： B22D7/00 , B22D7/06 , B22D27/04
摘要： PURPOSE:To form a sound ingot without any defect, such as V segregation and micro-porosity, etc., by arranging a bottom plate for mold set and the lower part of the mold as possible to cool and insulating heat of the upper part of the mold. CONSTITUTION:The mold set is laid on the water cooling bottom plate 1 having a water supplying hole 8 and a water exhausting hole 9, and consists of the water cooling lower part mold 2 having a water supplying hole 10 and a water exhausting hole 11, and the upper part mold fitting the heat insulating board 5. After pouring molten steel in this set, the heat insulating material 6 is covered. On the each size of the total mold height H, the height of the heat insulating board 5 part at the upper part of the mold is to be H/10, and the height of the lower part mold 2 is to be H/2-H/4, and is this example, it is H/3. In this way, the solidifying zone, which accelerates the development of defects at the position of 90-240cm from the ingot bottom conventionally is vanished and also the accelerating solidifying phenomenon, at the ingot top part is vanished, because of the heat insulation, and so the sound ingot without any defect, such as V segregation etc., is formed.

9. 发明专利

JPS62168642A PRODUCTION OF HOLLOW STEEL INGOT 失效
公开(公告)号：JPS62168642A
公开(公告)日：1987-07-24
申请号：JP17588285
申请日：1985-08-12
申请人： HITACHI LTD
发明人： UCHIDA TETSUO , KODAMA HIDEYO , KAJIWARA HIDEFUMI , WATANABE YASUO
IPC分类号： B22D27/04 , B22D7/04
摘要： PURPOSE:To obtain a hollow steel ingot having fine undirectionally solidified structure by forming a casting mold and core installed on a molding board into heat insulating structure and the molding board into water cooling structure and covering the surface of the molten steel in the casting mold with a heat retaining material. CONSTITUTION:A heat insulating material 3 is fixed to the inside of the casting mold 2 installed on the water cooled molding board 1 and the molten steel 4 is poured by a bottom pouring method through a core consisting of a pouring pipe 5 externally clad with the heat insulating material 3. The heat retaining material 6 is thrown onto the surface of the molten steel. The hollow steel ingot which has the fine undirectionally solidified structure from the bottom toward the top and is free from segregation and shrunk hole is thus obtd.

10. 发明专利

JPS61176464A PRODUCTION OF UNIDIRECTIONALLY SOLIDIFIED ANNULAR STEEL INGOTS 失效
公开(公告)号：JPS61176464A
公开(公告)日：1986-08-08
申请号：JP1656585
申请日：1985-02-01
申请人： HITACHI LTD
发明人： KAJIWARA HIDEFUMI , WATANABE YASUO , UCHIDA TETSUO , KODAMA HIDEYO
IPC分类号： B22D7/04 , B22D7/00 , B22D7/10 , B22D27/04
摘要： PURPOSE:To obtain simultaneously many annular steel ingots by disposing many cylindrical casting molds into a concentrical shape to form plural annular spaces then casting a molten steel at one time into the mold by a bottom pouring method. CONSTITUTION:The cylindrical casting mods 2, 4, 6 disposed with the heat insulting materials 3, 5, 6 on an ingot mold stool 1 are concentrically set. The molten steel 8 is then cast by bottom pouring through a pouring pipe 9 and a flow-off 10 into the two annular spaces formed of the stool 1 and the materials 3, 5, 6. A heat insulting material 11 is charged atop the molten steel after casting up to the prescribed height to complete the casting. The intermediate mold 4 contacts on both sides with the molten steel via the heat insulating material 5 and therefore the heat insulation is more intensified than the outer mold 3 and the increase in the casting height is made possible. The many annular steel ingots having different shapes are made obtainable at one time by the above-mentioned method.

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