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| Number | Title | Issue Date |
| 8177925 | High-tensile steel plate, welded steel pipe or tube, and methods of manufacturing thereof In a high-tensile steel plate according to the invention, the carbon equivalent Pcm represented in Expression (1) is from 0.180% to 0.220%, the surface hardness is a Vicker's hardness of 285 or less, the ratio of a Martensite Austenite constituent in the surface lay... | 05/15/2012 |
| 8168014 | Method for manufacturing martensitic stainless steel pipe or tube The method for manufacturing a martensitic stainless pipe includes heating the steel pipe until the external surface temperature thereof reaches a predetermined temperature not lower than A3 transformation point+20° C. and not higher than 980° C. The heated steel ... | 05/01/2012 |
| 8166789 | Pipe or tube reducing mill and roll for reducing mill A reducing mill includes a plurality of stands disposed along a rolling direction line. The stands each include n rolls (n≧3) disposed around the rolling direction line, the n rolls are shifted by 180°/n around the rolling direction line from n rolls included in ... | 05/01/2012 |
| 8163233 | Martensitic stainless steel for welded structures A martensitic stainless steel for welded structures including by mass %, C: 0.001 to 0.05%, Si: 0.05 to 1%, Mn: 0.05 to 2%, P: 0.03% or less, REM: 0.0005 to 0.1%, Cr: 8 to 16%, Ni: 0.1 to 9% and sol. Al: 0.001 to 0.1%; and further including one or more elements sele... | 04/24/2012 |
| 8158274 | Welding material and welded joint structure A welding material, to be used for welding a base metal made of an austenitic alloy comprising C≦2.0%, Si≦4.0%, Mn: 0.01 to 3.0%, P: more than 0.03% to not more 0.3%, S≦0.03%, Cr: 12 to 35%, Ni: 6 to 80%, sol. Al: 0.001 to 1% and N≦0.3%, with the balance bei... | 04/17/2012 |
| 8157930 | Martensitic stainless steel A martensitic stainless steel comprising C: 0.01-0.10%, Si: 0.05-1.0%, Mn: 0.05-1.5%, P: not more than 0.03%, S: not more than 0.01%, Cr: 9-15%, Ni: 0.1-4.5%, Al: not more than 0.05% and N: not more than 0.1% in mass %, and further comprising at least one of Cu: 0.0... | 04/17/2012 |
| 8157928 | Non-oriented electrical steel sheet and production process thereof A main object thereof is to provide a non-oriented electrical steel sheet being excellent in surface characteristics and having both excellent mechanical characteristics and magnetic characteristics necessary for a rotor of rotating machines such as motors and gener... | 04/17/2012 |
| 8152939 | Non-heat treated connecting rod and method of manufacturing the same A non-heat treated connecting rod which comprises, by mass %, C: 0.25-0.35%, Si: 0.50-0.70%, Mn: 0.60-0.90%, P: 0.040-0.070%, S: 0.040-0.130%, Cr: 0.10-0.20%, V: 0.15-0.20%, Ti: 0.15-0.20% and N: 0.002-0.020%, and the balance Fe and impurities, with chemical composi... | 04/10/2012 |
| 8151612 | Elongation rolling control method An elongation rolling control method is provided which can manufacture a hollow shell of high dimensional accuracy and can suppress rolling problems. It is an elongation rolling control method in which the groove bottom wall thickness of a hollow shell P in stand # | 04/10/2012 |
| 8141405 | Method for producing ultra thin wall metallic tube with cold working process An exemplary embodiment of the invention provides a method for producing an ultra thin wall metallic tube by cold working method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill according to the invention... | 03/27/2012 |
| 8137613 | Austenitic stainless steel welded joint and austenitic stainless steel welding material An austenitic stainless steel welded joint, whose base metal and weld metal each comprises, by mass percent, C: not more than 0.3%, Si: not more than 2%, Mn: 0.01 to 3.0%, P: more than 0.04% to not more than 0.3%, S: not more than 0.03%, Cr: 12 to 30%, Ni: 6 to 55%,... | 03/20/2012 |
| 8136871 | Strength member for an automobile body, front side member, and side structure for an automobile body A strength member for an automobile body such as a side member or a pillar which has a bent portion which is bent two-dimensionally or three-dimensionally and which has an ultrahigh strength with a tensile strength exceeding 1100 MPa is provided. The strength member... | 03/20/2012 |
| 8133431 | Austenitic stainless steel An austenitic stainless steel, which comprises by mass %, C | 03/13/2012 |
| 8122749 | Mandrel mill and process for manufacturing a seamless pipe A mandrel mill is provided which can perform elongation rolling with a markedly increased working ratio and dimensional accuracy on a material which is inherently difficult to roll such as a hollow shell made of stainless steel or a thin-walled material. A mandrel m... | 02/28/2012 |
| 8114355 | Metal tube for pyrolysis reaction A metal tube in the present invention is a metal tube for pyrolysis reaction with superior characteristics of both the heat exchange and the pyrolysis reaction, which is suitable for use in a process in which hydrocarbons are pyrolytically decomposed. The tube is a ... | 02/14/2012 |
| 8113055 | Method for evaluating fastening state of threaded joint of pipes or tubes and method for fastening threaded joint of pipes or tubes using the method There is provided a method capable of evaluating a fastening state of a threaded joint that is used as a joint of pipes or tubes such as OCTG with a high degree of accuracy even after being fastened and a method for fastening a threaded joint of pipes or tubes using... | 02/14/2012 |
| 8104349 | Flaw detection tracking device for pipe or tube and automatic flaw detecting apparatus for pipe or tube using the same A tracking device is provided with a non-contact type displacement gauge, a positioner which moves a flaw detecting sensor within a plane perpendicular to an axial direction of a pipe or tube, and a positioning controller which controls the positioner. The positioni... | 01/31/2012 |
| 8104316 | Piercing mill A piercing mill includes a plurality of inclined rolls, a plug, a pusher, and an undriven guide roll. The pusher pushes a round billet from the rear end at least until the round billet advances for a prescribed distance after contacting the inclined rolls. The guide... | 01/31/2012 |
| 8100313 | Source blank for stainless steel three-ply clad sheet, production methods of clad steel plate and sheet for solid polymer type fuel cell separator, and solid polymer type fuel cell separator A method for producing a stainless steel three-ply clad sheet for a fuel cell separator comprises heating a source blank and then performing rough rolling, hot rolling and cold rolling thereto, whereby the clad steel sheet for the fuel cell separator or a solid poly... | 01/24/2012 |
| 8091425 | Ultrasonic testing method of threaded joint of pipes or tubes An ultrasonic testing method relates to a threaded joint of pipes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part ... | 01/10/2012 |
| 8091399 | Process for manufacturing a seamless tube A process for manufacturing a seamless tube which can effectively suppress thickness deviations which are apt to occur in thin-walled seamless tubes is provided. A billet which has been soaked in a heating furnace at a given temperature for a given length of time is... | 01/10/2012 |
| 8091394 | Foreign pipe or tube determining method There is provided a foreign pipe or tube determining method capable of accurately determining a foreign pipe or tube. The foreign pipe or tube determining method in accordance with the present invention includes a step for determining the presence of a foreign pipe ... | 01/10/2012 |
| 8079243 | Plug, method of expanding inside diameter of metal pipe or tube using such plug, method of manufacturing metal pipe or tube, and metal pipe or tube The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases... | 12/20/2011 |
| 8071020 | High strength Cr-Ni alloy material and seamless pipe for oil well A high strength Cr—Ni alloy material excellent in hot workability and stress corrosion cracking resistance, and seamless pipe for oil well application which consists of, by mass percent, C: 0.05% or less, Si: 0.05 to 1.0%, Mn: 0.01% or more and less than 3.0%, P: ... | 12/06/2011 |
| 8070191 | Threaded joint for steel pipes A threaded joint for steel pipes comprises a pin having male threads and a box having female threads which engage with the male threads. An incomplete thread is formed at the start of the male threads and the incomplete thread has a portion in which the angle θ for... | 12/06/2011 |
| 8038811 | Process for producing bent pipe for line pipe A steel pipe is prepared, which contains, by mass, at most 0.009% C, at most 1.0% Mn, at most 1.0% Si, at most 0.04% P, at most 0.005% S, 0.01 to 0.2% Ti, 0.01 to 0.10% V, 0.001 to 0.1% Al, at most 0.1% N, 4.0 to 8.0% Ni, 9.0 to 15.0% Cr, and 1.5 to 7.0% Mo, the bal... | 10/18/2011 |
| 8038179 | Threaded joint for steel pipes A threaded joint for steel pipes comprising a pin 1 having a tapered male thread 11, a tapered sealing surface 13, and an end shoulder surface 14 and a box 2 having correspondingly a tapered female thread 21, a tapered seali... | 10/18/2011 |
| 8037732 | Method of producing seamless metal tube and punch for use therein A hole 30 is formed in the center of the rear end face 20 of a round billet 10. The hole 30 has a predetermined depth from the rear end face 20 and a plurality of grooves 31 are provided in the side surface thereof. Each gro... | 10/18/2011 |
| 8033319 | Method for continuous casting of steel and electromagnetic stirrer to be used therefor Disclosed is a continuous casting in which an electromagnetic stirrer is installed upstream, in the casting direction, of the reduction rolling position of a slab, and in which a slab with a liquid core is reduced in thickness, wherein by imparting a collision flow ... | 10/11/2011 |
| 8027796 | S/N ratio measuring method in eddy current testing on internal surface of pipe or tube A method in accordance with the present invention includes the steps of: separating an eddy current signal into an X-axis component and a Y-axis component to obtain signal waveform data of the respective components; excluding predetermined low-frequency components r... | 09/27/2011 |
| 8021502 | Method for producing martensitic stainless steel pipe A martensitic stainless steel pipe, which comprises specified quantities of C, Si, Mn, P, S, Cr, Ni, Al, N, Cu, Ti, V, Mo, Nb, B and Ca, and the balance being Fe and impurities, has satisfactory toughness at a high strength of 650 MPa or more by yield strength and a... | 09/20/2011 |
| 8020421 | Pusher device for piercing and rolling and method of manufacturing seamless pipe or tube using the same A pusher device 4 includes a cylinder device 30 and a pusher mandrel 34. The cylinder device 30 includes a cylinder shaft 32. The pusher mandrel 34 is attached to the tip end of the cylinder shaft 32. The tip end of t... | 09/20/2011 |
| 8016642 | Blasting device for steel pipe inner surface, blasting method for steel pipe inner surface, and method for producing steel pipe with excellent inner surface texture A blasting device for blasting steel pipe inner surface includes a tubular carrier fluid inflow unit connected to one end of a horizontal steel pipe, and a negative pressure suction unit connected to the other end of the steel pipe. A polishing material or a wiping ... | 09/13/2011 |
| 8006528 | Method for producing duplex stainless steel pipe, method for straightening, method for regulating strength, and method for operating straightener In straightening a duplex stainless steel pipe on a multi-roll pipe straightener, the value of A defined by the formula (1) is set to not more than 2.0% when it is not necessary to improve the mechanical strength of the pipe, and the value of A is set to more than 2... | 08/30/2011 |
| 7997627 | Threaded joint for steel pipes A threaded joint for steel pipes comprises a pin (1) and a box (2). The pin has male thread (11), a sealing surface (13), and a shoulder surface (14) located on the end face of the pin. Correspondingly, the box has female thread ( | 08/16/2011 |
| 7975619 | Two-axle truck for a railway car and a railway car Lateral pressure which develops in the front wheelset when traveling along a curved track is decreased while suppressing an increase in costs as much as possible. A two-axle truck for a railway car has a front wheelset having wheels with a first tread gradient and a... | 07/12/2011 |
| 7959709 | Method of producing steel for steel pipe excellent in sour-resistance performance A method of producing steel pipe excellent in sour-resistance performance, uses comprises controlling the amount of Ca addition charged into molten steel in a ladle according to a N content in the molten steel prior to Ca addition. As a result of the controlling ste... | 06/14/2011 |
| 7951469 | Welding material and welded joint structure A welding material, to be used for welding a base metal made of an austenitic alloy comprising C≦2.0%, Si≦4.0%, Mn: 0.01 to 3.0%, P: more than 0.03% to not more 0.3%, S≦0.03%, Cr: 12 to 35%, Ni: 6 to 80%, sol. Al: 0.001 to 1% and N≦0.3%, with the balance bei... | 05/31/2011 |
| 7937978 | Elongation rolling control method An elongation rolling control method is provided which can manufacture a hollow shell of high dimensional accuracy and can suppress rolling problems. It is an elongation rolling control method in which the groove bottom wall thickness of a hollow shell P in stand # | 05/10/2011 |
| 7935303 | Low alloy steel According to a low alloy steel of the present invention, compositional elements thereof are limited, and a metal structure thereof comprises bainite or martensite. Further, proper amounts of Nd inclusions are formed by appropriately selecting timings of deoxidation ... | 05/03/2011 |
