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1. 发明专利

JPH06264112A ROLL FOR STRAIGHTENING STEEL TUBE 失效
公开(公告)号：JPH06264112A
公开(公告)日：1994-09-20
申请号：JP5206193
申请日：1993-03-12
申请人： HITACHI METALS LTD , NIPPON STEEL CORP
发明人： OOSUE TAKUYA , FUKUZAWA HIROSHI , ONO KEIICHIRO
IPC分类号： B21B27/00 , B21D3/02 , B22F7/08 , B30B11/00 , C22C33/02 , C22C38/00
摘要： PURPOSE:To provide a roll having a sintered alloy layer excellent in resistance to wear at the time of straightening a steel tube, to attain the stabilization of the quality of the steel tube and the reduction in the man-hour for maintaining the roll by the stabilization of the profile on the surface of the roll over a long period and to improve its productivity. CONSTITUTION:The sintered alloy layer of alloy powder having chemical component constituted of, by weight, 1.5 to 3.0% C, 0.1 to 1.0% Si, 0.1 to 1.0% Mn, 2.0 to 6.0% Cr, 5.0 to 15.0% W, 5.0 to 10.0% Mo, 3.0 to 9.0% V and 5.0 to 15.0% Co, and the balance substantially Fe with impurity element is formed on the surface of a roll core material by HIP treatment. Furthermore, the shape of the roll core material is formed into a hourglass one.

2. 发明专利

JP2004237315A Mold for continuous casting 有权
公开(公告)号：JP2004237315A
公开(公告)日：2004-08-26
申请号：JP2003029108
申请日：2003-02-06
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： HAYASHI KAZUNORI , SATO SHINJI , ONO KEIICHIRO
IPC分类号： B22D11/059
摘要： PROBLEM TO BE SOLVED: To prevent the damage to a meniscus part in a mold for casting molten steel including zinc as impurities.
SOLUTION: The mold for continuous casting comprises copper or a copper alloy, and two or more chromium plating layers having a Vickers hardness of 600HV, of ≤0.01 are provided at least in the range from the upper end of the mold to a height of 300 mm including the meniscus part at the surface on the inner face side of the mold. The crack density as the number of cracks per unit length in the optional cross-section vertical to the casting direction of each chromium plating layer is preferably controlled to ≤5 pieces/cm. It is also possible that a plating layer of cobalt or an alloy consisting of ≤20% nickel, and the balance cobalt is formed on the whole inner surface of copper or a copper alloy, and a chromium plating layer is formed on a part or the whole part above the surface.
COPYRIGHT: (C)2004,JPO&NCIPI

3. 发明专利

JPH11314144A CONTINUOUS CASTING ROLL EXCELLENT IN COOLING CAPACITY 失效
公开(公告)号：JPH11314144A
公开(公告)日：1999-11-16
申请号：JP11973998
申请日：1998-04-28
申请人： NIPPON STEEL CORP
发明人： ONO KEIICHIRO , ISHIMORI YUICHI , ICHIKI MASAO
IPC分类号： B22D11/128
摘要： PROBLEM TO BE SOLVED: To prevent the lowering of cooling capacity by inserting a rectangular corrosion-resistant metallic plate having specific dimensions so as to be shiftable, into a cooling hole in the axial center of a roll so as to scrape away the stuck and grown scale on the center hole surface at the time of using the roll. SOLUTION: In the cooling hole 2, the metallic plate 3 of any one of an austenitic stainless steel, copper or copper alloy and lead or lead alloy, is inserted. At the time of substituting (t) for the thickness, (w) for the width of the metallic plate 3 and D for the diameter of the cooling hole 2, the dimensions of the metallic plate are made be in the range of w=(0.17-0.92)D, t=(0.05-0.15)D and the metallic plate has the width smaller than the diameter of the cooling hole 2 and larger than the hole diameter of rotary joint adapters 5 on both sides of the roll 1 and the length suitably shorter than the distance between both surfaces of the rotary joint adapters. In this way, the metallic plate 3 is turned over accompanied with the slow rotation of the roll 1 to scrape away the scale stuck on the surface of the cooling hole 2 and tending to grow with the collision and the slippage to the surface of the cooling hole 2.

4. 发明专利

JPH07138722A UNIVERSAL SHAFT JOINT IN MOLTEN METAL 失效
公开(公告)号：JPH07138722A
公开(公告)日：1995-05-30
申请号：JP29045893
申请日：1993-11-19
申请人： NIPPON STEEL CORP , NTN TOYO BEARING CO LTD
发明人： ONO KEIICHIRO , TSUYUKI AKIRA
IPC分类号： F16D3/16 , C23C2/00 , C23C2/40
摘要： PURPOSE:To greatly prolong the service life of the universal shaft joint of a clutch type by forming only the meshed parts, etc., for transmitting torque of the pawls and grooves formed on the joint body from a corrosion resistant and wear resistant alloy. CONSTITUTION:The in-bath universal shaft joint for driving the support roll of a continuous galvanizing device is composed of a pawl side shaft 8 having plural pieces of joint pawls 9 radially overhanging at equal intervals at the shaft end and a joint outside cylinder 10 having grooves to be meshed with these pawls 9 at the shaft end. At this time, the pawl side shaft 8 and the joint outside cylinder 10 are formed from an alloy consisting of SUS 410. High- hardness liners 12, 13, 14, 15 consisting of any of ceramics, cermet or corrosion resistant and wear resistant alloy having a required thickness are mounted only at the meshing parts A-1, A-2 for transmitting the torque of the pawls 9 and the grooves and the central joint side end face contact parts B-1, B-2 of the pawl side shaft 8 and the joint outside cylinder. As a result, the life of the universal shaft joint is greatly prolonged and the chatter marks of the steel sheet surface are drastically decreased.

5. 发明专利

JPH0775833A METHOD FOR CORRECTING BENT AND ROUNDNESS OF STEEL TUBE 失效
公开(公告)号：JPH0775833A
公开(公告)日：1995-03-20
申请号：JP22031093
申请日：1993-09-03
申请人： NIPPON STEEL CORP
发明人： ITSUBO GENI , TAKAMOTO TERUHISA , YAMASHITA HIDEKAZU , ONO KEIICHIRO
IPC分类号： B21D3/14 , B21D3/00 , B21D39/20
摘要： PURPOSE:To provide a method by which bent and roundness of a steel tube are accurately and simultaneously corrected at the time of expanding the steel tube of UO steel tube, etc. CONSTITUTION:In a method for correcting bent and roundness of a steel tube, expansion and bent correction are executed by uniformly projecting segments of an expansion machine in an initial process of expansion, then the bent and the roundness are measured, and based on the measured value, the expansion and the bent correction are executed again.

6. 发明专利

JPH03146234A PRODUCTION OF SQUARE PIPE MADE FROM LARGE-DIAMETER STEEL PIPE 失效
公开(公告)号：JPH03146234A
公开(公告)日：1991-06-21
申请号：JP28286889
申请日：1989-11-01
申请人： NIPPON STEEL CORP
发明人： ISHII YOSHIO , ONO KEIICHIRO , AOKI HIROMICHI
IPC分类号： B21C37/15 , B21D51/02
摘要： PURPOSE:To produce the square pipe from a large-diameter steel pipe by substituting the O die of an O press for producing a UO steel pipe with a square die and pressing the steel pipe. CONSTITUTION:The 2nd base die 4 to be exclusively used for forming the square pipe is provided between the base die 2 and the liner die 1 by modifying the conventional O die which constitutes the liner die 1 of the base die 2 and works a work (UO steel pipe stock 3). The material of the 2nd base die 4 is approximately the same as the material of the base die 2 and is worked with a hole to the extent at which the square pipe of the largest bore can be produced. Several sheets of the liner dies 1 are laminated to a prescribed caliber for the square pipes of smaller bores. The square pipe is easily produced in large amt. from the large-diameter steel pipe in this way after the longitudinal weld beads on the outside surface are cut away.

7. 发明专利

JPH01284426A STRAIGHTENING METHOD FOR OUT OF ROUNDNESS/BEND OF STEEL PIPE AND PIPE EXPANDING MACHINE USED THEREFOR 失效
公开(公告)号：JPH01284426A
公开(公告)日：1989-11-15
申请号：JP11238288
申请日：1988-05-11
申请人： NIPPON STEEL CORP
发明人： KAKITA KAZUTOSHI , AOKI HIROMICHI , ONO KEIICHIRO , SEKIZAKA TOMOJI
IPC分类号： B21D3/14
摘要： PURPOSE:To improve the accuracy in straightening and to reduce the cost by arranging an expansion shoe in plural pieces on the boom of the vicinity of a pipe expansion head, fixing the shoe in a specified direction by its elongation and performing streightening by making other shoes in a contracted state. CONSTITUTION:Plural shoes B1-B8 and lift devices E1-E8 are arranged in correspondence on the outer periphery of a boom 2 at the vicinity of a pipe expansion head 3. A pipe expansion is performed from the pipe end of a steel pipe 1 and the pipe 1 is stopped in the state of the pipe expansion head 3 and shoe coming into the pipe end, the corresponding shoes B4-B6 are elongated to the radius of the pipe 1 by actuating the lift devices E4-E6 in the necessary direction and a pipe expansion operation is executed. In this case, a bending moment is acted on the pipe 1 whose bending remains by the pressure of the shoes B4-B6, the bending is straightened and the out of roundness is simultaneously straightened as well. The straightening accuracy is improved because the straightening is executed over the whole length with simple mechanism and operation and its cost is reduced.

8. 发明专利

JP2000107843A CONTINUOUS CASTING ROLL EXCELLENT IN COOLING POWER 失效
公开(公告)号：JP2000107843A
公开(公告)日：2000-04-18
申请号：JP28228698
申请日：1998-10-05
申请人： NIPPON STEEL CORP
发明人： ONO KEIICHIRO , ISHIMORI YUICHI , MIYAMOTO YASUNORI , ICHIKI MASAO
IPC分类号： B22D11/128
摘要： PROBLEM TO BE SOLVED: To prevent the sticking of scale on a cooling hole by arranging a clamper to a pipe for cooling water, fitting stainless steel-made rings to the clamper, sizing the diameter of the ring to the intermediate size between the outer diameter of the pipe and the diameter of the cooling hole and disposing stainless steel round bars in a space formed with the adjacent rings, the outer diameter of the pipe and the inner wall of the cooling hole. SOLUTION: The clamper 4 projecting to the diameter direction is arranged to the pipe 3 in the inner part of the cooling hole 2 in the continuous casting roll. To the clamper 4, the rings 7-1, 7-2, 7-3 are welded and fixed. The stainless steel round bars 8 are disposed in the spaces between the adjacent rings 7-1 and 7-2 and between the adjacent rings 7-2 and 7-3. The diameter of the stainless steel round bar 8 is sized to >1/2 of the gap size between the outer surface of the pipe 3 and the inner wall of the cooling hole 2 in the continuous casting roll. Applying of knurling or rough shot blasting on the outer cylindrical surface of the stainless steel round bar 8, is desirable because of the improvement of the effect for peeling out the scale.

9. 发明专利

JPH11267807A CONTINUOUS CASTING ROLL 失效
公开(公告)号：JPH11267807A
公开(公告)日：1999-10-05
申请号：JP7100198
申请日：1998-03-19
申请人： NIPPON STEEL CORP
发明人： ISHIMORI YUICHI , ONO KEIICHIRO
IPC分类号： B22D11/128
摘要： PROBLEM TO BE SOLVED: To prevent the development of a crack which arises from the continuos casting roll surface, in almost parallel to the perimeter direction, and progresses from the surface to the inside. SOLUTION: The particle with the curvature in the crack progress direction for preventing the progress of the crack is placed in concentric circular state in the roll cross section at a certain depth from a roll surface where breakage does not happen even if the crack develops and also placed so that crack progress from any position may reach the particle. Further, the combination of the particle and the peripheral material should be the combination of the particle and the peripheral material, in which the crack does not develop continuously from the peripheral material to the particle. By this, breakage trouble of the continuous casting roll by the progress of the crack is solved, and an exchange period for the crack repair is drastically improved, and the productivity of the continuous casting equipment can be improved.

10. 发明专利

JPH04285113A HEARTH ROLL FOR THICK STEEL PLATE HEAT TREATMENT FURNACE 失效
公开(公告)号：JPH04285113A
公开(公告)日：1992-10-09
申请号：JP4641591
申请日：1991-03-12
申请人： NIPPON STEEL CORP
发明人： ONO KEIICHIRO , MURAI YOSHIO
IPC分类号： C21D1/00 , C22C1/05 , F27B9/24
摘要： PURPOSE:To prevent the occurrence of pickup in a hearth roll for thick steel plate heat treatment furnace. CONSTITUTION:A sprayed deposit which is composed of cermet containing alumina and chromina and in which surface Shore hardness Hs at ordinary temp. is regulated to a value between 45 and 70 and not lower than 70-(5/2)XRa(surface roughness) and also Ra is regulated to >=4 microns is formed on the surface of a hearth roll.

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