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1. 发明专利

JPH10212626A PRODUCTION OF PITCH-BASED CARBON FIBER 失效
公开(公告)号：JPH10212626A
公开(公告)日：1998-08-11
申请号：JP1609097
申请日：1997-01-30
申请人： NIPPON OIL CO LTD , NIPPON STEEL CORP , NIPPON STEEL CHEMICAL CO , NIPPON GRAPHITE IND LTD
发明人： KATO OSAMU , KIHARA TSUTOMU , ARAI YUTAKA , FURUYAMA MASATOSHI , KOBAYASHI TAKESHI , DOKEN KATSUYUKI
IPC分类号： C10C3/02 , C10C3/04 , C10C3/10 , D01F9/145
摘要： PROBLEM TO BE SOLVED: To provide a method for producing carbon fiber having a high tensile modulus and high compression strength. SOLUTION: In a method for producing a carbon fiber by melt-spinning mesophase pitch, subjecting the pitch to infusibilization treatment and baking treatment, mesophase pitch having 0.16-0.31 unoriented carbon ratio at 340 deg.C is melted and flow of the pitch is once narrowed in a nozzle inlet part and after passing through the nozzle inlet part, the flow of the pitch is enlarged to an inlet hole having a diameter larger than that of the nozzle inlet part and the flow of the pitch is again narrowed in a first approach part in which a shape of the nozzle from the inlet hole to a discharge hole is opened at an angle of 40-150 deg. and a second approach part opened at an angle of 170-185 deg. on the inlet hole side located between the first approach part and the discharge hole and passed through the discharge hole provided in collected part of the second approach part and spun.

2. 发明专利

JPH0317250A SURFACE REFORMING ROLL 失效
公开(公告)号：JPH0317250A
公开(公告)日：1991-01-25
申请号：JP15077889
申请日：1989-06-14
申请人： NIPPON STEEL CORP
发明人： INOUE TAKESHI , KATO OSAMU , YAMAMOTO HIROYASU , YAMAMOTO TOYOKI
IPC分类号： F16C13/00 , B21B27/00 , C23C4/06
摘要： PURPOSE:To improve the adhesive property of a hard film of a WC-Co system to the base material of the cold rolling roll on which a high load and high face pressure are applied by providing specific relations among the film thickness and Shore hardness of the above-mentioned hard film and the Shore hardness of the base metal of the roll at the time of forming the hard film having excellent wear resistance on the surface of the roll. CONSTITUTION:The hard film of the WC-Co system is formed on the surface of the roll for cold rolling of steel products, etc., in such a manner as to satisfy the relations expressed by equation among the thickness thetamum of the hard film of the WC-Co system, the Shore hardness HS1 of the film and the Shore hardness HS2 of the base material of the rolling roll in order to prevent the peeling of the hard film of the WC-Co system during the operation at the time of forming the hard film of the WC-Co system on the surface of the rolling roll by an explosive thermal spraying, etc., to improve the wear resistance of the roll. The adhesive property of the hard film to the base material of the roll is thereby improved and the service life of the cold rolling roll is prolonged.

3. 发明专利

JPH02213498A METHOD FOR REFORMING METALLIC MATERIAL SURFACE 失效
公开(公告)号：JPH02213498A
公开(公告)日：1990-08-24
申请号：JP3533789
申请日：1989-02-15
申请人： NIPPON STEEL CORP
发明人： INOUE TAKESHI , KATO OSAMU , YAMAMOTO HIROYASU , KIKUMA TOSHIO
IPC分类号： C25D15/02
摘要： PURPOSE:To reform the surface of a metallic material and to impart excellent wear resistance and lubricity to the material by dispersing hard powdery fine particles having specified hardness and the fine particles of BN, graphite, etc., in the metallic plating layer of Ni, Co, etc., in specified amts. CONSTITUTION:The composite plating film is formed on the surface of a metallic material as follows by dispersing powdery fine particles in the metallic plating film. Namely, the hard particles of SiC, etc., having 1-5mum grain size and >=900 Vickers hardness and the self-lubricating fine particles of >=1 kind among the BN, graphite and mica having 1-5mum grain size are dispersed in the metallic plating layer of Ni, Ni-P, hard chromium or Co. In this case, the weight ratio of the hard fine particles to the self-lubricating fine particles is controlled to (80:20)-(50:50), and the total content of both fine particles of the metallic plating layer is controlled to 10-25wt.%. The surface-reformed metallic material is specially utilized to improve the wear resistance of a work roll for cold rolling.

4. 发明专利

JPH0288747A WEAR-RESISTANT ROLL MATERIAL 失效
公开(公告)号：JPH0288747A
公开(公告)日：1990-03-28
申请号：JP24124888
申请日：1988-09-27
申请人： NIPPON STEEL CORP
发明人： HASHIMOTO MITSUO , IIBOSHI MUNETOSHI , AYAGAKI MASATOSHI , KATO OSAMU
IPC分类号： B21B27/00 , C22C29/00 , C22C29/02 , C22C29/06 , C22C29/08 , C22C29/10 , C22C29/16 , C22C32/00 , C22C33/02 , C22C38/00 , C22C38/18
摘要： PURPOSE:To obtain a roll material having excellent wear resistance and resistance to roughening of surface and furthermore effective for seizure resistance by subjecting ferrous alloy powder contg. specific amounts of C and Cr and contg, M7C3 carbide to hot isostatic pressure treatment. CONSTITUTION:The power of an ferrous alloy contg. 1 to 4% C and 5 to 25% Cr and contg. M7C3 carbide is subjected to hot isostatic pressure treatment to form a roll material. Or, one or more kinds among the carbide of W, V, Nb, Mo and Ti or Ti nitride are furthermore mixed to the ferrous powder, and the mixture is subjected to hot isostatic pressure treatment. The roll material has excellent wear resistance, and, owing to the grain refining of the structure, has improve resistance to roughening of surface and seizure resistance. In this way, the service life of a work roll in hot rolling can be improved. Furthermore, high-load rolling is attained and a rolled material of good quality can be obtd.

5. 发明专利

JPH01294858A SURFACE TREATMENT OF ROLL AND DEVICE THEREFOR 失效
公开(公告)号：JPH01294858A
公开(公告)日：1989-11-28
申请号：JP12184288
申请日：1988-05-20
申请人： NIPPON STEEL CORP
发明人： HAYASHI KAZUNORI , SUGIYAMA KENJI , KATO OSAMU , FUKUTANI KAZUHIKO
IPC分类号： C23C14/24 , C23C14/22 , C23C14/48
摘要： PURPOSE:To form a dense and uniform film having an excellent characteristic in follow-up to minute ruggednesses on the surface by surface-treating a roll by ion implantation and vacuum deposition, and further implanting ions on the same site on the roll surface in the different direction. CONSTITUTION:A vacuum vessel 1 is evacuated by a vacuum pump 30, a roll 2 to be treated is horizontally placed on a roller structure 16 and turned by a rotating device 10 through a gear 21, a torque transmitting device 8, etc. Ions are implanted in the roll 2 from an ion implantation device 5, a film forming material is vapor deposited from a vapor deposition device 3 to form a film, and the roll is surface-treated. In this treatment, the ions are implanted in the two or more different directions at optional angles to the roll surface. At the same time, the vapor deposition device 3 and the ion implantation device 5 are reciprocated in the axial direction of the roll by a moving mechanism consisting of a driving device 23, a gear 26, a belt 24, a sliding support 22, a rail 25, a limit switch 27, etc. By this method, the surface of the roll 2 is uniformly treated.

6. 发明专利

JPH06293952A THERMAL SPRAYING METHOD FOR IMPROVING FILM PROPERTY 失效
公开(公告)号：JPH06293952A
公开(公告)日：1994-10-21
申请号：JP8095493
申请日：1993-04-07
申请人： NIPPON STEEL CORP
发明人： KATO OSAMU , NAKAJIMA HIROE , YAMAMOTO HIROYASU , ADAKA MATSUO
IPC分类号： C23C4/12 , H05H1/42
摘要： PURPOSE:To improve the wear resistance and adhesion of a film at the time of applying thermal spraying on the curcumferential surface of a rotating cylindrical material by pressing a press roller on the material surface immediately after thermal spraying at a specified contact pressure. CONSTITUTION:A cylindrical material 1 to be sprayed is rotated, and thermal spraying is applied from a thermal spraying gun 3 to form a film. At this time, a press roller 2 having a rotating shaft parallel to the rotation axis of the material 1 is arranged directly behind the gun 3 with a partition plate 4 in-between, and a contact pressure at >=10MPa is applied on the material surface. Consequently, the pore is pressed at a high temp. immediately after spraying, the diffusion between a film and the substrate is promoted, and the wear resistance and adhesion of the film are improved.

7. 发明专利

JPH05138202A METHOD FOR ROLLING STEEL MATERIAL 失效
公开(公告)号：JPH05138202A
公开(公告)日：1993-06-01
申请号：JP31039591
申请日：1991-11-26
申请人： NIPPON STEEL CORP
发明人： KATO OSAMU , NITTA NOBUAKI , ADAKA MATSUO
IPC分类号： B21B1/22 , B21B27/10 , B21B28/04 , C10M125/10 , C10M125/24 , C10M125/26 , C10N10/02 , C10N10/04 , C10N10/08 , C10N10/14 , C10N10/16
摘要： PURPOSE:To improve wear resistance and seizing resistance of roll for rolling steel material. CONSTITUTION:The composition of a oxidized film on the surfaces of a rolled stock and roll in rolling is controlled. That is, the oxidized film of the rolled stock is preliminarily made in basicity of >=1 and the oxidized film of the roll is made in basicity of

8. 发明专利

JPH03293540A IMPACT FATIGUE BREAKING TEST FOR HARD/BRITTLE MATERIAL 失效
公开(公告)号：JPH03293540A
公开(公告)日：1991-12-25
申请号：JP9404290
申请日：1990-04-11
申请人： NIPPON STEEL CORP
发明人： KATO OSAMU , INOUE TAKESHI , YAMAMOTO HIROYASU , TAJIMA KAZUICHI
IPC分类号： G01N3/32 , G01N33/38
摘要： PURPOSE:To evaluate breaking characteristic when an impact force is received repeatedly by striking a ball with a fixed radius to a flat test piece with fixed dimensions (with thickness thereof exceeding a half of the ball). CONSTITUTION:A testing machine with an force of impact and a speed variable is used and a fixed stress is applied to various ceramic materials repeatedly to measure a frequency until the materials break. Here, the shape of a striking element which is optimum is spherical because of limited deformation or destruction and limited variations in contact condition. Secondarily, a test piece with a thickness thereof less than radius of a ball is caused to break with early penetration of cracking, resulting in larger scattering of data. To prevent this the thickness necessary of the test piece exceeds a half of the radius of the ball. A microscopic cracking develops depending on material with the repetition of a fixed impact force exceeding a certain frequency and when the impact force is increased, the frequency is reduced. This phenomenon is the same as fatigue and can be considered as impact fatigue breaking characteristic.

9. 发明专利

JPH02127499A HOT ROLLING OIL 失效
公开(公告)号：JPH02127499A
公开(公告)日：1990-05-16
申请号：JP27932388
申请日：1988-11-07
申请人： NIPPON STEEL CORP
发明人： KURAHASHI TAKAO , KOGA TAKAHIKO , TANIGAWA KEIICHI , KATO OSAMU
IPC分类号： C10M109/02 , C10M169/04 , C10N10/02 , C10N10/08 , C10N20/02 , C10N30/06 , C10N40/24
摘要： PURPOSE:To provide the title oil capable of improving the surface characteristics of steel plates and the wear resistance of rolls, containing a solid lubricant and a high-viscosity esterification product from reaction between N-contg. alcohol and fatty acid, etc. CONSTITUTION:The objective hot rolling oil containing (A) a high-viscosity esterification product >=600cps/50 deg.C in viscosity prepared by reaction between (1) N-contg. alcohol of formula I and/or II (x is H or CH3; n is 1-10; R is 2-6C alkyl, phenyl or cyclohexyl) and (2) a blend of >=6C fatty acid and rosin including disproportionated rosin hydrogenated rosin or polymerized rosin at the weight ratio (90:10)-(25:75), and (B) a solid lubricant such as mica, graphite, potassium titanate and melamine cyanurate.

10. 发明专利

JPH01266906A MANUFACTURE OF SURFACE MODIFIED ROLL FOR HOT ROLLING 失效
公开(公告)号：JPH01266906A
公开(公告)日：1989-10-24
申请号：JP9355988
申请日：1988-04-18
申请人： NIPPON STEEL CORP
发明人： KATO OSAMU , INOUE TAKESHI
IPC分类号： B21B27/00
摘要： PURPOSE:To obtain a film not peeling off during hot rolling by preheating a hot rolling roll to a prescribed temp. in a manufacturing stage for the roll. CONSTITUTION:A base stock of a hot rolling roll is preheated to a temp. not less than a max. temp. to which temps. of parts near the boundary between the base stock and a film reach during hot rolling. Thus, a film not peeling off during hot rolling is formed on the roll surface and the hot rolling roll having excellent characteristics is made. Further, reduction of consumption amounts of the roll, improvement of product surface quality, and improvement of the production efficiency are achieved.

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