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Patent Searching and Data


Matches 301 - 350 out of 1,206

Document Document Title
JP2000343106
To provide a speed-changing rolling method of an Assel mill to minimize hindrance of productivity during seamless steel pipe elongator rolling.In this speed-changing method of an Assel mill, when the number of revolutions of rolls is con...  
JP2000334507
To provide a roll slip inhibitor for hot rolling with which the improvement of biting property and prevention of choking in piercing are possible and piercing method by which stable operation is enabled and products excellent in internal...  
JP2000334506
To suppress the occurrence of flaws at the time of tube making when Mannesmann piercing is mainly applied to diffucult-to-work materials which is inferior in hot workability and taken as being unsuitable to the material for seamless stee...  
JP2000334505
To suppress the cost of material by using a cast billet consisting of a hard-to-work material or an as-cast material and to prevent flaws on the inside surface of a tube even when Mannesmann piercing is executed by confining the rotation...  
JP2000326002
To allow the section shape of a seamless steel tube to be completely round and to straighten the bend thereof by using a rotary sizer whose roll shape is deformed uneven as the rotary sizer in a process for improving the roundness. The r...  
JP3129064
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast bill...  
JP2000312907
To provide a steel pipe with isotropic and superior ductility and collision-impact resistance characteristics without requiring a large-scale process modification by combining stretch-rolling and skew-rolling at the rolling temperature f...  
JP3127822
To provide a method for manufacturing the seamless steel pipe made of a high W duplex stainless steel. After heating a billet made of a duplex stainless steel, containing W of 1.5wt.% or higher and 5wt.% or lower in a temperature range i...  
JP2000301214
To reduce rotational acceleration and to secure the accuracy of centering of a position of a piercing plug by being provided with a core bar shifter for restraining or releasing the end part of the core bar and a driving device for rotat...  
JP2000301212
To provide a rolling method of a tube stock for seamless tubes for not generating pleat-shaped stripping/bulging defects on the inside surface of the tube stock at the time of rolling and piercing the tube stock for seamless tubes with a...  
JP2000301213
To secure workability and to prevent the generation of internal flaws at the time of executing Mannesmann piercing of high carbon steel. A billet which is made by continuously casting the high-carbon steel containing, by weight, 0.60 to ...  
JP3120927
PURPOSE: To provide a manufacture method of a seamless steel tube having grain refining organization. CONSTITUTION: This seamless steel tube having grain refining organization is manufactured as below. After a steel heated to a high temp...  
JP3119160
To prevent defective bite, the contraction of a tube end, and the occurrence of an uneven thickness, and to improve quality and productivity even when piercing rolling a thick tube with high expansion ratio and low ratio of piercing by s...  
JP2000280008
To drill a hollow pipe whose thickness nonuniformity is suppressed by using specific values for the distance between an inclined roll center and a mandrel holding device adjacent to the inclined roll, distance between mutually adjacent m...  
JP2000280007
To supply lubricant to guide shoe at either non-rolling time or rolling time by spraying the lubricant toward the opposed guide shoe surface at non- rolling time and supplying the lubricant between the material to be rolled and the guide...  
JP2000246354
To build up a plastic processing tool for processing symmetrically rotate working material so as to reduce hertzian pressure. A plastic processing tool 1 has eccentrically arranged two rolling elements 2, 3 the eccentric rate e of which ...  
JP2000246311
To make a seamless pipe out of difficult-to-process steel or steel as it is cast without increasing the cost by giving back pressure to the steel by means of a pusher to push it until it is stably taken in and controlling the pusher movi...  
JP3106824
PURPOSE: To attain a forming condition free from the generation of a roll mark by finding the generation limit line of the roll mark according to the ovalities of three roll stands, and limiting the ovalities of two roll stands and a dra...  
JP2000239807
To produce a heat resistant austenitic stainless steel having sufficient structural stability as well as high strength at high temperature, excellent steam oxidation resistance, and excellent fire side corrosion resistance. This steel ha...  
JP2000233209
To economically produce a seamless steel tube while suppressing an inner face flaw in piercing by specifying the diameter of a billet containing a specified ratio of Cr and conducting Mannesman piercing at least at a specified temp. and ...  
JP2000225403
To provide an effective inexpensive method for preventing harmful burning to the working surface of a working tool. Relating to the two roll skew rolling type piercer provided with the working tool for rolled stocks whose plastic deforma...  
JP2000190006
To obtain a seamless steel pipe without inner surface defect by using a continuously cast billet. This invention relates to a method to drill continuously-cast billet of a seamless steel pipe material with a drilling roll having barrel t...  
JP2000190007
To obtain a hollow body or pipe with specified outside diameter and wall thickness while reducing reheating time and preventing the danger of the bottom being broken through by using a mandrel with a spherical end when the hollow materia...  
JP2000176512
To improve biting property at the time of piercing a billet.In a method for piercing the billet 1 of a base stock for seamless steel tubes with piercing rolls 3 having a barrel-shaped roll body, after forming a tapered surface 2 whose ta...  
JP2000176511
To pierce a billet without generating internal lapping marks and biting failure.In a method for piercing the billet 1 of a base stock for seamless steel tubes with piercing rolls 2 having a barrel-shaped roll body, after heating the bill...  
JP2000176514
To obtain a steel tube on the inside surface of which lap-ping marks are not generated even when the draft at the tip of a billet is reduced by forming the inlet face angle of a roll having a barrel-shaped body part in two steps and maki...  
JP2000158017
To eliminate the adjustment or the changing work of the drawing device of a pierced shell with setup change in tube making by automating the drawing device of the pierced shell and making it size-free.(1) In a piercing mill provided with...  
JP2000160280
To obtain a heat resistant steel excellent in strength at high temperature at a low cost by providing a composition containing specific percentages of C, Si, Mn, V, and one or ≥2 elements among Nb, Ti, Ta, Hf, and Zr and also providing...  
JP2000160247
To prevent the occurrence of scalelike eruption flaw at the external surface by carrying out soaking treatment under the condition that the soaking temperature and soaking time of a billet satisfy a specific relation.Billet is composed o...  
JP2000140911
To provide a method for piercing a round billet by which hot only the generation of inside surface flaws is suppressed but productivity is raised than that by conventinal methods. In a method for piercing the round billet in which the ro...  
JP2000119749
To produce a Cr-Mo seamless steel pipe free from the dispersion of strength and excellent in toughness by a simplified producing process.In the case of heating a billet contg. 0.10 to 0.25% C, ≤1.0% Si, 0.2 to 2.0% Mn, ≤0.020% P, ≤...  
JP3058025
PURPOSE: To provide the easy, safe and precise aligning method. CONSTITUTION: In the aligning method of rolling mill which executes measurement from the reference face of a housing 1 by use of a jig 14, while the jig 14 is placed between...  
JP3046183
PURPOSE: To produce a seamless steel tube excellent in SSC resistance by specifying chemical components and also limiting hot rolling conditions and cooling conditions, respectively. CONSTITUTION: A steel having specific chemical compone...  
JP3036356
PURPOSE: To manufacture a seamless tube without the occurrence of a defect even in the case of a high expansion ratio. CONSTITUTION: A billet B is fed in the axial length direction, is rotated helically and is moved by the rotations of b...  
JP2000051904
To provide a size-free rolling method of metallic materials in which the finished cross-sectional shape in the outer peripheral part is approximately complete roundness, the uneven diameter difference is extremely small and the cross-sec...  
JP3033446
PURPOSE: To provide a continuously cast billet for seamless stainless steel pipe base stock, by which an inner surface flaw of the pipe does not develop at the time of pierce-rolling, by shifting the internal gap developed at the last so...  
JP2000024704
To prevent the generation of flaws on an outer peripheral surface of a tube body even in cold-rolling the tube body made of not limited to ordinary steel but high alloy steel by replacing lower shoes of guide shoes for a reeler in the pr...  
JP2000024705
To provide a manufacturing method of a seamless steel tube by a plug mill tube-making line by which the generation of a carburized layer on the inside surface is suppressible and seamless alloy steel tube excellent in corrosion resistanc...  
JP2000024706
To provide a manufacturing method of a seamless steel tube by a mandrel mill tube-making line by which the generation of carburized layer on the inside surface is prevented even when a mandrel bar to which graphite is stuck is used and s...  
JP2000024703
To prevent the generation of flaws on outer peripheral surface of a tube body even in case of cold-rolling the tube body made of not limited to ordinary steel but high alloy steel by executing the grinding of the tube body and shape corr...  
JP2000000605
To manufacture a pipe without causing cost increase even for a hardly workable material or the like and without remaining a flaw on the pipe inner face by obliquely piercing and rolling a round cast metal as casting by using a plug and p...  
JP11347605
To prevent the inner face of a tube to be rolled from generating a crack by making a Q value and T. Red a specific value so that tensile stress generated at a Pilger rolling time is crossed to metal fibers by using a base tube is which t...  
JP3003553
To provide a high expansion ratio piercing method without generating inside grazing caused by a plug. After setting setup so that the inner peripheral length of a hollow tube stock is larger than the outer peripheral length in the max. d...  
JP11314106
To automatically remove iron pieces stuck after burning to the outer peripheral surface of a roll without dismounting inclined rolls from the main body of the mill in the inclined roll mill provided with the inclined rolls which are arra...  
JP11310822
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,...  
JP11310823
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 ...  
JP2998605
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...  
JP2998395
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 ...  
JP2994159
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...  
JP2994202
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...  

Matches 301 - 350 out of 1,206