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Patent Searching and Data


Matches 651 - 700 out of 2,190

Document Document Title
JPH11310823A
To provide a method of manufacturing a martensitic stainless steel tube having high strength of which the yield stress exceeds 650 MPa and also having excellent toughness at a low temperature. After martensitic stainless steel which has ...  
JPH11310822A
To provide a method for producing a martensitic stainless steel tube having high strength of >650 MPa yield stress and having excellent low temp. toughness. Martensitic stainless steel having a compsn. contg., by weight, 0.15 to 0.22% C,...  
JP2972966B2  
JP2998605B2
To obtain a piercing device in which the tip of a plug is prevented from eroding by using an analysis model in a piercing method of a seamless metallic tube. In a piercing device, the temp., which is measured with a temp. measuring devic...  
JP2998395B2
PURPOSE: To prevent the bottom of a tube from being cut off without generating inside scratches and blocking the bottom, improve the rolling efficiency and carry out high quality of rolling. CONSTITUTION: The terminal of a tube material ...  
JP2994159B2
PURPOSE: To improve the roundness without changing rolls at an arbitrary external diameter by rotating and revolving plural recessed rolls having a radius larger than a pipe radius each. CONSTITUTION: Plural inclinable recessed rolls hav...  
JP2994202B2
PURPOSE: To manufacture a steel tube having high roundness over the entire length by dividing sizer rolls of the final stand into four in the circumferential direction of pipe and executing drawing by changing the ratio of the base diame...  
JPH11285708A
To provide a method and apparatus by which tensile stress in a core of a material to be worked is minimized or burst of the material to be worked is avoided. A 3-roll rotary piercer for forming hollow billets is provided with a mandrel 4...  
JPH11277110A
To manufacture various kinds of square pipes with the same forming rolls by canceling rotational force in the circumferential direction which is the cause of twist which is liable to generate on pipe stocks by the inclination of forming ...  
JPH11244913A
To provide a piercer capable of improving the service life of a plug and the quality of the inside surface of a material to be pierced in the piercing stage of a metallic long colume body. In this device, the plug 1 is made into the shap...  
JP2973885B2
To obtain a method for drawing, reducing and sizing a seamless metallic tube by which defective bar stripping is not generated even when drawing, reducing and sizing are executed, by using a size capable of interstand tension imparting r...  
JP2932958B2  
JPH11197715A
To enlarge the possible manufactural length of a seamless steel tube. In the boring method of the seamless steel tube by an inclined roll, a boring plug 2 is arranged so that the maximum diameter part 2a is positioned in a gorge part 1b ...  
JP2921783B2  
JPH11188408A
To stably manufacture electric-resistance-welded steel pipes with superior roundness without reducing the manufacturing efficiency with necessary minimum rolls by reducing the weld zone with horizontal rolls immediately after heating/sof...  
JPH11169914A
To prevent the generation of internal carbunization and also to improve the quality of the inside surface by regulating the temp. of the inside of a material to be pierced just before rolling with the 2nd piercer (elongator) within a ran...  
JP2913115B2  
JP2900795B2  
JP2898775B2  
JP2900804B2  
JPH11123420A
To absorb the fluctuation of a rolling load at the time of an abnormal rolling in manufacturing a seamless steel tube, and to simply repair the equipment of the rolling mill. On the rolling down device of this rolling mill, hydraulic cyl...  
JPH11114609A
To obtain a rolling mill to cope with the production of small quantities in many kinds of seamless steel tubes sized from a small diameter to a large diameter by providing a means of turning a cannon holder and making it travel along a p...  
JP2884321B2  
JP2880991B1
[Summary] Subject The punch unit which makes possible improvement in plug life and punching material inside quality improvement in the punching process of a metal long column object is offered. Solution means While considering it as the ...  
JPH1190511A
To provide the method and device for manufacturing a seamless steel tube made of an Fe-base alloy whose Cr content is <15 wt.%, which are immediately applicable to existing manufacturing equipment by which a product steel tube reduced in...  
JP2880385B2  
JPH1181903A
To prevent the generation of secondary flow between cascade while reducing thickness of a boundary layer by providing a center part in a blade body, providing a suction hole in the back surface of the blade body so as to suck the steam o...  
JP2864397B2  
JPH1157705A
To conduct volume filtration by making it difficult for a clad to intrude into a filter, to efficiently filter off the iron clad without precoating it and to remove the iron clad with a large throughput for a long time. A cylindrical fil...  
JP11057842A
To obtain a method of manufacturing a steel pipe; wherein a special adjustment of measurements of the pipe is substantially not required for a final cold finishing working, and compressive strength in the direction of the pipe's length i...  
JP2857312B2  
JP2844924B2  
JP2831865B2  
JPH10314812A
To provide a manufacturing method of a seamless tube that is excellent in the durability of piercing plug. In this manufacturing method, a billet is arranged on the pass line of roll which are arranged obliquely to the advancing directio...  
JP2827129B2  
JPH10286620A
To provide a manufacturing method for a welded steel pipe by which yield ratio in the axial direction of the tube that is only raised in the manufacturing process in a conventional method is lowered. In the manufacturing method of the we...  
JP2815749B2  
JPH10249409A
To manufacture plural kinds of metallic tube with spiral projections having different wall-thickness without changing rolling rolls. In this manufacturing method, a solid metallic bar or metallic tube of hot pierced or stretched with a s...  
JPH10249412A
To obtain a piercing plug for a seamless metallic tube which restricts an adopted fault generating on the inside surface of a product tube and which does not reduce the life of the plug by making the thickness of scale skin film of a ree...  
JP2580519Y2  
JPH10235413A
To provide a method and device for manufacturing a seamless steel tube by which the life of a plug used for piercing is drastically prolonged. In the manufacturing method of the seamless steel tube including hot piercing stage, at the ti...  
JPH10237604A
To prevent cracking at the time of blooming and to provide excellent sulfide stress cracking resistance by specifying respective contents of C, Si, Mn, P, S, Cr, Ni, Al, N, Mo, and Cu and also specifying cast bloom temp. in the course of...  
JPH10235422A
To effectively improve the bar-stripping property even when the coefficient of friction between a mandrel bar and a shell is varied by changing the properties of the surface of the mandrel bar. Tension which acts on the shell A between m...  
JPH10224090A
To suppress incorrect follow-up of a cam follower with respect to a tubular cam while enhancing durability through a simple structure by constructing means for urging one cam follower toward the tubular cam side of a leaf spring. Under a...  
JPH10180310A
To prevent generation of inside surface scratch of steel tube and to manufacture seamless tube with excellent inside surface skin by manufacturing a rolling stock for seamless tube of specified shape and then piercing rolling the rolling...  
JPH10180315A
To obtain a plug with much more improved life time than in the conventional are under a severe condition of being constantly exposed to high temperature and high load by changing a part of plug located at the outermost surface of plug wi...  
JPH10180312A
To prevent generation of defects such as crack in the end part of a tube stock and the like due to δ ferrite at the time of piercing rolling of cast billet for seamless tube with a piercer by rolling billet under satisfying specified co...  
JPH10180314A
To roll a hard-to-work tube stock such as a Ni-base alloy tube without generating cracks on the inside surface. This rolling method is composed so that the tube stock is drawn while imparting tensile force to the tube stock H from the fr...  
JPH10180313A
To roll a hard-to-work tube stock such as Ni-base alloy without generating plastic deformation on a mandrel. This rolling method is composed so that the tube stock H is drawn while imparting tensile force to the tube stock H from the fro...  
JPH10180311A
To provide a method for preventing the slip of piercer rolls by jetting a slip preventing agent to a round bar and the piercer rolls in piercing with a piercer. In the method for preventing the slip of the piercer rolls 1, the current va...  

Matches 651 - 700 out of 2,190