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Patent Searching and Data


Matches 451 - 500 out of 2,058

Document Document Title
JP2000334505A
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...  
JP2000326002A
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...  
JP3129064B2
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...  
JP2000312907A
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...  
JP3127822B2
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...  
JP2000301214A
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...  
JP2000301212A
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...  
JP2000301213A
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 ...  
JP3120927B2
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...  
JP3119160B2
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...  
JP2000280008A
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...  
JP2000280007A
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...  
JP2000246354A
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 ...  
JP2000246311A
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...  
JP3106824B2
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...  
JP2000239807A
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...  
JP3085149B2  
JP3085256B2  
JP2000233209A
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 ...  
JP3082419B2  
JP3082665B2  
JP3082489B2  
JP3082678B2  
JP3082414B2  
JP3082415B2  
JP3080090B1  
JP2000225403A
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...  
JP3067649B2  
JP2000190006A
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...  
JP2000190007A
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...  
JP2000176512A
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...  
JP2000176511A
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...  
JP2000176514A
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...  
JP2000158017A
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...  
JP2000160280A
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...  
JP2000160247A
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...  
JP2000506071A  
JP2000140911A
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...  
JP3041068B2  
JP2000119749A
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, ≤...  
JP3058025B2
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...  
JP3046183B2
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...  
JP3021664B2  
JP3017593B2  
JP3036356B2
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...  
JP2000051904A
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...  
JP3033446B2
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...  
JP3006486B2  
JP3006942B2  
JP3004875B2  

Matches 451 - 500 out of 2,058