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| Number | Title | Issue Date |
| 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 |
| 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 |
| 7399372 | Method for manufacturing metallic bellows A metallic bellows, composed of precipitation hardening stainless steel, includes ridge portions and valley portions formed alternately and continuously, an average grain size of 10 to 15 μm, and compressive residual stress of not less than 500 MPa provided to at l... | 07/15/2008 |
| 7238434 | Welded structure having improved resistance to stress corrosion cracking This invention relates to a welded line pipe structure for transporting corrosive petroleum or natural gas. It is constituted by martensitic stainless steel pipes containing 8–16% Cr and at most 0.05% C. By suitably controlling the welding conditions at the time o... | 07/03/2007 |
| 7232053 | Seam-welded air hardenable steel constructions The present invention provides seam-welded, air hardenable steel tubes, methods of manufacturing seam-welded air hardenable steel tubes, tube mills for practicing such methods and applications for using seam-welded, air hardenable steel tubing of the present inventi... | 06/19/2007 |
| 7201812 | Method for manufacturing seamless steel tube A method for manufacturing a seamless steel tube, wherein a tubing material for the seamless steel tube is produced by a hot working process from a material having less workability, such as a high Cr—high Ni—high C alloy steel including Cr at a content not less ... | 04/10/2007 |
| 7174769 | Monitoring contents of fluid containers Apparatus for remote inspection of fluid containers, e.g., portable tanks or fluid pipelines, includes an electronic circuit in communication between each container (or at various locations along a pipeline) and a remote central station. The electronic circuit is ad... | 02/13/2007 |
| 7138069 | Method of surface-finishing stainless steel after descaling A new surface finishing process for stainless steel where beautiful, bright and milky white coloured surface is obtainable even for such grades as high carbon containing 13 chromium steel and high sulfur containing free cutting stainless steel is disclosed. After re... | 11/21/2006 |
| 7094295 | Ferritic stainless steel sheet having good workability and manufacturing method thereof A method of manufacturing a ferritic stainless steel sheet having good workability with less anisotropy. The steps include providing a ferritic stainless steel comprising C up to about 0.03 mass %, N up to about 0.03 mass %, Si up to about 2.0 mass %, Mn up to about... | 08/22/2006 |
| 6899773 | Fine-grained martensitic stainless steel and method thereof An iron based, fine-grained, martensitic stainless steel essentially free of delta ferrite has a nominal composition of (wt. %): 0.05 | 05/31/2005 |
| 6890665 | Martensitic stainless steel and method for manufacturing the same Martensitic stainless steel whose steel composition is restricted within a specific range for each element is provided. The scale layer formed on the surface of the base material consists of an inner layer scale mainly including FeCr2O4 and an ... | 05/10/2005 |
| 6890393 | Fine-grained martensitic stainless steel and method thereof An iron based, fine-grained, alloy. ... | 05/10/2005 |
| 6887322 | High pressure cylinders including backing steel with tool steel lining High pressure cylinders comprising backing steel cylinders and tool steel liners are disclosed. An annealed tool steel liner is inserted into the backing steel cylinder, followed by heat treating to harden the tool steel liner. The tool steel liner may be provided a... | 05/03/2005 |
| 6780261 | Method of manufacturing an implantable stent having improved mechanical properties A metallurgical process for producing a metallic implantable medical device, such as a stent, in a condition wherein the metallic alloy of the device has improved mechanical properties. The starting material is formed into an oversized tube which is drawn to finishe... | 08/24/2004 |
| 6692592 | Method for manufacturing high chromium system seamless steel pipe A method for manufacturing a high Cr system seamless steel pipe having a high inside surface quality with a high efficiency and at a reduced production cost is provided. An initial material including Cr at a content of 10 to 20%, and impurities S and P at... | 02/17/2004 |
| 6610154 | Surface treatment of austenitic Ni-Fe-Cr based alloys for improved resistance to intergranular corrosion and intergranular cracking A surface treatment process for enhancing the resistance to intergranular corrosion and intergranular cracking of components fabricated from austenitic Ni--Fe--Cr based alloys comprising the application of surface deformation to the component, to a depth ... | 08/26/2003 |
| 6475307 | Method for fabricating vehicle components and new use of a precipitation hardenable martensitic stainless steel A composition and method for the manufacture of products of a precipitation hardenable martensitic stainless steel, the composition of which comprises at least 0.5% by weight of Cr and at least 0.5% by weight of Mo wherein the sum of Cr, Ni and Fe exceeds... | 11/05/2002 |
| 6436202 | Process of treating a stainless steel matrix Heat resistant stainless steel may be treated in a low oxidizing atmosphere in a heat/soak-heat/soak sequence to deplete its surface of Ni and Cr which tend to catalyze coking of hydrocarbons in contact with the surface of the stainless steel, and enrich ... | 08/20/2002 |
| 6344097 | Surface treatment of austenitic Ni-Fe-Cr-based alloys for improved resistance to intergranular-corrosion and-cracking A surface treatment process for enhancing the intergranular corrosion and intergranular cracking resistance of components fabricated from austenitic Ni--Fe--Cr based alloys comprised of the application of surface cold work to a depth in the range of 0.01 ... | 02/05/2002 |
| 6303237 | Ferritic alloy for constructions A compound tube including a layer of a Fe--Cr alloy and a layer of load-carrying component, with the optional addition of further layers. The Fe--Cr alloy preferably has a composition including, in weight-%: less than 0.3% carbon, 15-60% chromium, less th... | 10/16/2001 |
| 6302974 | Method and apparatus for straightening turbine casings An austenitic rounding fixture is inserted into the horizontal joint of a turbine casing. The casing is then assembled and stress relief cycle is carried out, resulting in rerounding of the casing and relief of residual stresses. Since an austenitic mater... | 10/16/2001 |
| 6231690 | Method of oxidizing inner surface of ferritic stainless pipe A method of oxidation treatment of the inner surface of a ferritic stainless steel pipe comprising feeding an oxidizing gas into steel pipe from one end thereof while moving the steel pipe in a pipe-length direction, and heating the pipe in a heating furn... | 05/15/2001 |
| 6159311 | Martensitic stainless steel pipe and method for manufacturing the same A martensitic stainless steel pipe comprises, on the weight basis, C: 0.005 to 0.2%, Si: 1% or below, Mn: 0.1 to 5%, Cr: 7 to 15%, and Ni: 0 to 8%, wherein a wall thickness t (mm) and contents of C and Cr satisfy the relationship represented by the follow... | 12/12/2000 |
| 6136109 | Method of manufacturing high chromium martensite steel pipe having excellent pitting resistance A high-Cr martensite steel pipe having excellent pitting resistance and method for manufacturing the same, which involves forming a pipe of steel including C: about 0.03 wt % or less, Si: about 0.5 wt % or less, Mn: about 0.5-3.0 wt %, Cr: about 10.0-14.0... | 10/24/2000 |
| 6103027 | Method of making seam free welded pipe A process for forming a cylindrical pipe from a welded metal pipe stock by roll extruding and annealing whereby the weldment microstructure forming the seam is essentially reformed to provide a recrystallized grain structure which is substantially homogen... | 08/15/2000 |
| 6090230 | Method of cooling a steel pipe A method of cooling a martensitic steel pipe by cooling the inner and outer surface substantially equally while rotating the pipe around the axis, wherein the cooling rate is 8° C./s or higher. The inner surface is preferably cooled by passing water with... | 07/18/2000 |
| 6060180 | Alloy having high corrosion resistance in environment of high corrosiveness, steel pipe of the same alloy and method of manufacturing the same steel pipe The present invention provides a highly corrosion-resistant alloy used as a boiler tube in equipment the energy source of which is obtained by burning fossil fuel or waste, a steel tube for which the alloy is used, and a process for producing the steel tu... | 05/09/2000 |
| 5849116 | Production method for steel material and steel pipe having excellent corrosion resistance and weldability A steel material and a steel pipe each exhibiting an excellent corrosion resistance in an environment containing a wet carbon dioxide and a small amount of hydrogen sulfide are produced at low cost and with high productivity, a steel slab which contains, ... | 12/15/1998 |
| 5817193 | Metal alloys having improved resistance to intergranular stress corrosion cracking In the fabrication of components from a face centered cubic alloy, wherein the alloy is cold worked and annealed, the cold working is carried out in a number of separate steps, each step being followed by an annealing step. The resultant product has a gra... | 10/06/1998 |
| 5783000 | Method for heat treatment of steel, and products of steel A method for heat-treating steel, primarily strip-like or rod-like steel material, such as steel strip, steel sheet, steel rod or steel wire which have been rolled and heated in an oven or furnace to a surface temperature above about 900 degrees C. and th... | 07/21/1998 |
| 5702543 | Thermomechanical processing of metallic materials In the fabrication of components from a face centred cubic alloy, wherein the alloy is cold worked and annealed, the cold working is carried out in a number of separate steps, each step being followed by an annealing step. The resultant product has a grai... | 12/30/1997 |
| 5605587 | Apparatus for magnetic conditioning of liquids and methods of making same Martensitic steel components of apparatus for magnetic conditioning of liquids which are subjected to cathodic reaction and degradation are treated prior to use to form a barrier of iron-chromium oxide and a uniform level of hardness throughout by heating... | 02/25/1997 |
| 5462615 | Weldable high-strength structural steel with 13% chromium Disclosed is a process for producing seamless steel pipes or flat products (strip or sheet) for pipes or vessels which are intended for the conveyance, transport or processing of gaseous or liquid hydrocarbons containing CO2 and water and possi... | 10/31/1995 |
| 5352406 | Highly mechanical and corrosion resistant stainless steel and relevant treatment process A properly balanced chemical composition and the choice of a heat treatment (annealing and quenching) under controlled conditions allow to obtain uperduplex stainless steel manufactures which, in the hot-worked form, are excellent in resistance to corrosi... | 10/04/1994 |
| 5049210 | Oil Country Tubular Goods or a line pipe formed of a high-strength martensitic stainless steel A high-strength martensitic stainless steel excellent in corrosion resistance and stress corrosion cracking resistance, the composition of which comprises: 0.1% or less carbon, 1% or less silicon, 2% or less manganese, 8-14% chromium, 1.2-4.5% copper, 0.0... | 09/17/1991 |
| 5026436 | Process for the production of tubular bodies In a process for the production of tubular bodies that are resistant to stress corrosion cracking, in particular non-magnetizable drill stems and rod sections of austenitic steels, after solution treatment, quenching, and after deformation at a temperatur... | 06/25/1991 |
| 4948435 | Method for inhibiting stress corrosion cracking Method and apparatus for inhibiting stress corrosion cracking adjacent weldments in steel workpieces such as stainless steel pipe through generation of a controllable throughwall temperature differential by exposure of one workpiece surface to externally ... | 08/14/1990 |
| 4842655 | Process for improving resistance of metal bodies to stress corrosion cracking A process for improving resistance of pressure vessel shells, tubesheets, tubes, pipes, pipe fittings and machine parts to stress corrosion cracking comprising heating at least those portions of such bodies subject to danger by stress corrosion cracking t... | 06/27/1989 |
| 4596282 | Heat treated high strength bimetallic cylinder A high strength bimetallic cylinder having a wear-resistant ferrous liner or inlay and capable of withstanding high stresses is provided by a heat treatment process wherein the cylinder steel is transformed into the austenitic phase, followed by rapidly c... | 06/24/1986 |
| 4432811 | Method of making seamless tubing A process for producing seamless tubes of austenitic steels is disclosed. A metallic melt is continuously poured into a cooled mold having a round molding cavity. The as yet fully unsolidified extracted billet is electromagnetically agitated in a directio... | 02/21/1984 |
