Vanadium, Tantalum Or Niobium Containing Patents (Class 420/127)
-
Patent number: 7220325Abstract: A process for enhancing precipitation strengthening in steel and for making a high-strength micro-alloy steel, and a steel made from the process. The process includes the step of deforming the steel containing a suitable precipitate strengthening substance, at a temperature at which the microstructure of the steel is essentially stable and at which those precipitation strengthening particles that form are of a desirable particle size for precipitation strengthening. Deforming the steel introduces dislocations in the crystal structure of the steel, which increases the kinetics of precipitation by increasing the number of precipitation nucleation sites and accelerating the rate of diffusion of the precipitate material. The steel may be deformed by bending or rolling the steel. Preferably the process also includes the step of cooling the steel at a rapid rate so as to minimize the formation of precipitate particles of a larger-than-desired size.Type: GrantFiled: October 2, 2003Date of Patent: May 22, 2007Assignee: IPSCO Enterprises, Inc.Inventors: Dengqi Bai, Michael Ambrose Cooke, James Asante, Jonathan Dorricott
-
Patent number: 7014812Abstract: A sulfur-containing free-cutting steel for machine structural use, containing, in weight percent, 0.10 to 0.55% of C, 0.05 to 1.00% of Si, 0.30 to 2.50% of Mn, not more than 0.15% of P, 0.050 to 0.350% of S, more than 0.010% but not more than 0.020% of Al, 0.015 to 0.200% of Nb, 0.0015 to 0.0150% of O, and not more than 0.02% of N, and further containing, in weight percent, at least one selected from the group consisting of 0.03 to 0.50% of V, 0.02 to 0.20% of Ti and 0.01 to 0.20% of Zr, wherein the ratio S/O of the S content to the O content is 15 to 120, and at least one selected from the group consisting of an oxide, a carbide, a nitride and a carbonitride of Nb(see FIG. 1) acts as nuclei for precipitation of MnS type inclusions.Type: GrantFiled: October 25, 2002Date of Patent: March 21, 2006Assignees: Mitsubishi Steel Mfg. Co., Ltd., Yoshimura Technical Office Inc.Inventors: Tatsuo Fukuzumi, Motoki Watanabe, Tsuneo Yoshimura, Katsuyuki Uchibori
-
Patent number: 6946097Abstract: A high strength and creep resistant soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, at least 35% Co, and 2.5%?(V+Mo+Nb), wherein 0.4%?Mo and/or 0.4%?Nb. This alloy can further include B, C, W, Ni, Ti, Cr, Mn and/or Al. A vanadium-free high strength soft magnetic Fe—Co alloy includes, in weight %, Fe and Co such that the difference between the Fe and Co is at least 2%, and at least 15% Co, the alloy further satisfying (0.1%?Nb and 0.1%?W) or 0.25%?Mn. This alloy can further include B, C, Ni, Ti, Cr and/or Al.Type: GrantFiled: December 10, 2002Date of Patent: September 20, 2005Assignee: Philip Morris USA Inc.Inventors: Seetharama C. Deevi, Rangaraj S. Sundar
-
Patent number: 6942741Abstract: An iron alloy strip having a gage of 0.1 to 5 mm and a magnetic field strength variation within the strip of 0 to 10 Hz, made of an iron alloy consisting essentially of, in % by weight, 0.0001-0.02% of C, 0.0001-5% of Si, 0.001-0.2% of Mn, 0.0001-0.05% of P, 0.0001-0.05% of S, 0.0001-5% of Al, 0.001-0.1% of O, 0.0001-0.03% of N, 0-10% of Co, 0-10% of Cr, 0.01-5% in total of Ti, Zr, Nb, Mo, V, Ni, W, Ta and/or B, and the balance of Fe, and having a saturation magnetic flux density of 1.7-2.3 Tesla, a maximum relative permeability of 1,200-22,000 and a coercive force of 20-380 A/m is suited for use as yokes in voice coil motor magnetic circuits. The iron alloy strip is highly resistant to corrosion and eliminates a need for a corrosion resistant coating.Type: GrantFiled: August 7, 2002Date of Patent: September 13, 2005Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Masanobu Shimao, Masaaki Nishino, Takehisa Minowa
-
Patent number: 6921497Abstract: The present invention relates to new compositions of matter, particularly metals and alloys, and methods of making such compositions. The new compositions of matter exhibit long-range ordering and unique electronic character.Type: GrantFiled: April 12, 2002Date of Patent: July 26, 2005Assignee: Electromagnetics CorporationInventor: Christopher J. Nagel
-
Patent number: 6822831Abstract: An object of the present invention is to provide a recording head having a magnetic pole simultaneously possessing a high saturation magnetic flux density, a high permeability and a high electric resistivity, and the magnetic pole of the recording head is a polycrystalline film comprising Fe whose content is not less than 57.5 atomic % and not more than 94.5 atomic %; one or more kinds of elements selected from the element group of Al, B, Ga, Si, Ge, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Rh, whose whole content is not less than 1 atomic % and not more than 15 atomic %; N whose content is not less than 0.5 atomic % and not more than 10 atomic %; and O whose content is not less than 1.5 atomic % and not more than 22.5 atomic %.Type: GrantFiled: February 12, 2002Date of Patent: November 23, 2004Assignee: Fujitsu LimitedInventors: Shoji Ikeda, Yuji Uehara, Ikuya Tagawa, Naoki Takeguchi, Masahiro Kakehi
-
Publication number: 20040168753Abstract: A steel sheet containing 0.004 to 0.02% C, 1.0% or less Si, 0.7 to 3.0% Mn, 0.02 to 0.15% P, 0.02% or less S, 0.01 to 0.1% Al, 0.004% or less N, 0.2% or less Nb, by mass %, optionally Ti, Bi or at least one element selected from the group consisting of Cr Mo, Ni and Cu, and the balance being Fe; the Nb content satisfying a formula of (12/93)×Nb*/C≧1.0, wherein Nb*=Nb−(93/14)×N, and wherein C, N and Nb designate the content in mass % of carbon, nitrogen and niobium, respectively; and a yield strength and an average grain size of the ferritic grains which satisfy a formula of YP≦−120×d+1280, wherein YP designates yield strength in MPa, and d designates an average size of ferritic grains in &mgr;m.Type: ApplicationFiled: March 2, 2004Publication date: September 2, 2004Applicant: NKK CORPORATIONInventors: Katsumi Nakajima, Takeshi Fujita, Toshiaki Urabe, Yuji Yamasaki, Fusato Kitano
-
Patent number: 6685882Abstract: A high strength soft magnetic Fe−Co−V alloy, comprising, in weight %, (Fe+Co)≧88%, (Fe−Co)≧2% or (Co−Fe)≧2%, at least 30% Co, and satisfying one of the following three conditions: (1) 0.05 to 4% Mo and 1.5 to 10% V, or (2) (Fe−Co) or (C0−Fe)≦13 and at least 4% V, or (3) at least 7% V. Additional alloying constituents, including B, C, Nb, Ti, W and Ni can be present.Type: GrantFiled: January 11, 2001Date of Patent: February 3, 2004Assignee: Chrysalis Technologies IncorporatedInventors: Seetharama C. Deevi, Rangaraj S. Sundar, Dwadasi H. Sastry
-
Patent number: 6669790Abstract: An iron-based casting alloy and a process for making the alloy are provided by combining an iron-carbon-chromium system with primary carbides of vanadium, niobium, titanium, or combinations thereof without any eutectic carbides of vanadium, niobium and titanium. Eutectic chromium carbides (M7C3) are also formed without any primary chromium carbides. Proeutectic austenite can also be formed in the alloy.Type: GrantFiled: May 16, 1997Date of Patent: December 30, 2003Assignee: Climax Research Services, Inc.Inventors: Richard B. Gundlach, Sumita Majumdar
-
Patent number: 6660105Abstract: A case hardening steel having good-grain coarsening prevention properties during carburization. The steel comprises, by weight, 0.1 to 0.4%. C, 0.02 to 1.3% Si, 0.3 to 1.8% Mn, 0.001 to 0.15% S, 0.015 to 0.04% Al, 0.005 to 0.04% Nb, 0.006 to 0.020% N, one, two or more selected from 0.4 to 1.8% Cr, 0.02 to 1.0% Mo, 0.1 to 3.5% Ni, 0.03 to 0.5% V, and in which P is limited to not more than 0.025%, Ti is limited to not more than 0.010%, and O is limited to not more than 0.0025%, with the balance being iron and unavoidable impurities, the steel being characterized in that, following hot rolling, the steel has a Nb(CN) precipitation amount of not less than 0.005% and an AlN precipitation amount that. is limited to not more than 0.005%.Type: GrantFiled: May 19, 1999Date of Patent: December 9, 2003Assignee: Nippon Steel CorporationInventors: Tatsuro Ochi, Manabu Kubota
-
Publication number: 20030190251Abstract: A process for enhancing precipitation strengthening in steel and for making a high-strength micro-alloy steel, and a steel made from the process. The process includes the step of deforming the steel containing a suitable precipitate strengthening substance, at a temperature at which the microstructure of the steel is essentially stable and at which those precipitation strengthening particles that form are of a desirable particle size for precipitation strengthening. Deforming the steel introduces dislocations in the crystal structure of the steel, which increases the kinetics of precipitation by increasing the number of precipitation nucleation sites and accelerating the rate of diffusion of the precipitate material. The steel may be deformed by bending or rolling the steel. Preferably the process also includes the step of cooling the steel at a rapid rate so as to minimize the formation of precipitate particles of a larger-than-desired size.Type: ApplicationFiled: April 3, 2002Publication date: October 9, 2003Applicant: IPSCO Enterprises Inc.Inventors: Dengqi Bai, Michael Ambrose Cooke, James Asante, Jonathan Dorricott
-
Patent number: 6623691Abstract: The present invention describes an ultra-low carbon bake hardenable galvanized or galvannealed steel product, having a higher yield strength at the temperature of the molten zinc bath while maintaining a low yield strength and excellent bake hardening properties in a skinpassed condition, BH0 being higher than 35 MPa and BH2 higher than 40 MPa (GI) and BH0>20 MPa and BH2>30 MPa (GA), as well as having a superior paint appearance after stamping and painting. The content in the steel composition of the Ti is comprised between 3.42 N and 3.42 N+60 ppm for a fixed nitrogen content (N), and the Nb-content, comprised between 50 ppm and 100 ppm, is fixed so that no substantial precipitation of niobium carbides will occur during the process.Type: GrantFiled: December 22, 2000Date of Patent: September 23, 2003Assignee: Sidmar N.V.Inventors: Sven Vandeputte, Serge Claessens
-
Patent number: 6615476Abstract: A method is required in which a plate-like flange member may be firmly secured at the front end of a hollow shaft member through a plastic working treatment by virtue of caulking combination, so as to manufacture a hollow shaft having a flange at one end thereof.Type: GrantFiled: June 26, 2000Date of Patent: September 9, 2003Assignees: Fuji Jukogyo Kabushiki Kaisha, Kubota Iron Works Co., LTDInventors: Shigeaki Yamanaka, Masami Oguri
-
Patent number: 6562207Abstract: Sputter target, method of manufacture of same and sputter coating process using the target as a sputtering source are disclosed. The sputter target comprises an Me/Si multi-phase, consolidated blend wherein the Si component is present in a very small amount of about trace—0.99 mole Si:1 mole Me. Preferably, Me comprises one or more of Ta, Ti, Mo, or W. The targets are made from the requisite powders via HIP consolidation to provide densities of greater than 98 % of the theoretical density. The targets are especially useful in reactive cathodic sputtering systems employing N2 as the reactive gas to form amorphous Me/Si/N layers.Type: GrantFiled: January 14, 2000Date of Patent: May 13, 2003Assignee: Tosoh SMD, Inc.Inventor: Eugene Y. Ivanov
-
Patent number: 6540846Abstract: Disclosed herein is a high-strength hot-rolled steel sheet superior in stretch-flanging properties and fatigue properties which comprises (in mass %) 0.01-0.10% C, less than 2% Si (including 0%), 0.5-2% Mn, less than 0.08% P (including 0%), less than 0.01% S (including 0%), less than 0.01% N (including 0%), 0.01-0.1% Al, and at least one of 0.1-0.5% Ti and less than 0.8% Nb (including 0%), with the granular bainitic structure accounting for more than 80% (by area) in its sectional metallographic structure. Disclosed also herein is a process for producing said steel sheet.Type: GrantFiled: February 27, 2001Date of Patent: April 1, 2003Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Takahiro Kashima, Shunichi Hashimoto
-
Patent number: 6521057Abstract: A high-strength and high-toughness steel product having at least about 0.001% and less than about 0.030% by weight C, not more than about 0.60% by weight Si, from about 0.8 to 3.0% by weight Mn, from about 0.005 to 0.20% by weight Nb, from about 0.0003 to 0.0050% by weight B, and not more than about 0.005% by weight Al, wherein at least 90% of the product has a bainite structure. A method of making this steel product is subject to less stringent production controls because of the nature of the composition.Type: GrantFiled: August 15, 2001Date of Patent: February 18, 2003Assignee: Kawasaki Steel CorporationInventors: Noritsugu Itakura, Mitsuhiro Okatsu, Fumimaru Kawabata, Keniti Amano
-
Publication number: 20020185201Abstract: The present invention provides a steel product which, while minimizing an increase in hardness after forging to ensure machinability and cold workability, is improved, for example, in fatigue strength in its non-hardened portion and is improved, in its hardened portion, in rolling resistance level, antipitting level, abrasion resistance, and fatigue strength. The high strength steel for induction hardening comprises, by mass, carbon (C): 0.5 to 0.7%, silicon (Si): 0.5 to 1.0%, manganese (Mn): 0.5 to 1.0%, chromium (Cr): not more than 0.4%, and sulfur (S): not more than 0.035% with the balance consisting of iron (Fe) and unavoidable impurities, the steel being forged to produce a component at least a part of which is then inductively hardened before use.Type: ApplicationFiled: February 1, 2002Publication date: December 12, 2002Applicant: SANYO SPECIAL STEEL CO., LTD.Inventor: Shuhei Kitano
-
Patent number: 6475642Abstract: An oxidation-resistant coating is described, formed of an alloy containing: about 40 to about 50 atom % aluminum and about 0.5 atom % to about 3 atom % tantalum; with a balance of nickel; cobalt, iron, or combinations thereof. The coating may also include chromium and a precious metal, as well as other components, such as zirconium or molybdenum. A method for applying the oxidation-resistant coating to a substrate is also described. The substrate can be formed of superalloy material, e.g., a turbine engine component. Related articles are also disclosed.Type: GrantFiled: August 31, 2000Date of Patent: November 5, 2002Assignee: General Electric CompanyInventors: Ji-Cheng Zhao, Melvin Robert Jackson, Ramgopal Darolia
-
Publication number: 20020127132Abstract: A high strength soft magnetic Fe−Co−V alloy is provided in which the weight percent of constituents are such that (Fe+Co)≧90, (Fe−Co)≧10, and 1.5 to 10% V. Additional alloying constituents, including B, C, Nb, Ti, W, Ni and Mo, can be present.Type: ApplicationFiled: January 11, 2001Publication date: September 12, 2002Inventors: Seetharama C. Deevi, Rangaraj S. Sundar, Dwadasi H. Sastry
-
Patent number: 6428631Abstract: A high-strength steel sheet having excellent fatigue property, excellent formability and resistance to softening of the heat affected zone after welding, comprising: 0.01 to 0.15 mass % of C, 0.005 to 1.0 mass % of Si, 0.1 to 2.2 mass % of Mn, 0.001 to 0.06 mass % of P, 0.001 to 0.01 mass % of S, 0.0005 to 0.01 mass % of N, 0.001 to 0.1 mass % of Al, 0.005 to 0.05 mass % of Nb, 0.05 to 0.5 mass % of Mo, when necessary, 0.001 to 0.02 mass % of Ti, 0.2 to 2.0 mass % of Cu and 0.05 to 2.0 mass % of Ni, and the remainder of Fe, wherein the components satisfy the following expression (A). 0.Type: GrantFiled: March 16, 2000Date of Patent: August 6, 2002Assignee: Nippon Steel CorporationInventors: Toshimasa Tomokiyo, Hirokazu Taniguchi, Ryo Maruta
-
Patent number: 6383308Abstract: To provide a torsion bar for the use of a seat belt retractor which can be manufactured without a spheroidizing annealing process. A torsion bar to be used as a load limiter in a seat belt retractor is characterized in that the torsion bar is made of steel of which the carbon content is 0.04% or less.Type: GrantFiled: July 3, 2000Date of Patent: May 7, 2002Assignee: Takata CorporationInventors: Muneo Nishizawa, Yasushi Kanamori, Joji Mishina
-
Patent number: 6383662Abstract: A high-strength lightweight steel and its use for car parts and facade linings is a purely ferritic steel having, in mass %, more than 5 to 9% Al, less than 0.2% Si, and 0.03 to 0.2% Mn.Type: GrantFiled: May 12, 2000Date of Patent: May 7, 2002Inventor: Georg Frommeyer
-
Patent number: 6375763Abstract: A pearlitic steel railroad rail which comprises 0.75 to 0.84% C, 0.10 to 1.0% Si, 0.4 to 2.5% Mn, 0.035% or less P, 0.035% or less S, and 0.05 to 0.6% Nb, by weight. This rail has better wear resistance than the heretofore used pearlitic steel rail and sufficient ductility so cracks do not appear due to thermal dilation and contraction caused by a change of temperature. The rail is consequently very suitable for the use in a mine railroad.Type: GrantFiled: May 17, 2000Date of Patent: April 23, 2002Assignee: NKK CorporationInventors: Hiroyasu Yokoyama, Shinji Mitao
-
Patent number: 6361624Abstract: A method of producing a fully stabilized extra low carbon porcelain enameling steel having excellent formability and fish scaling resistance as well as superior enamel adherence. The method includes hot rolling a slab to strip, the slab having a composition consisting essentially of in weight percent: 0.005 max. C, 0.35 max. Mn, 0.015 max. P, 0.015 max. S, 0.015 max. Si, 0.025 to 0.055 Al, 0.006 to 0.015 N, 0.03 to 0.06 Ti, 0.02 to 0.05 Cb, up to 0.03 Sb, the balance Fe and inevitable impurities. The hot rolled strip is cold rolled at least 65% and box annealed until a cold spot temperature within the range of 610 to 705 degrees C. is reached. The invention includes the product made according to the process.Type: GrantFiled: September 11, 2000Date of Patent: March 26, 2002Assignee: USX CorporationInventor: George Franklin Altemus
-
Patent number: 6355212Abstract: The invention is directed to anti-corrosive alloys and relates in particular to an alloy containing cobalt, chromium, aluminum, yttrium, silicon, a metal from the second main group, together with the corresponding oxide, in the following proportions: chromium (Cr) 26.0-30%; aluminum (Al) 5.5-13.0%; yttrium (Y) 0.3-1.5%; silicon (Si) 1.5-4.5%; metal from the second main group (magnesium, calcium, barium, strontium) 0.1-2.0%; oxide of the corresponding metal from the second main group 0.1-2.0%; cobalt (Co) remaining percentage. Preferably, tantalum (Ta) is also added in a proportion of 0.5-4.0%, and the remaining percentage of cobalt is replaced by a remaining percentage of Me, Me being understood to mean a metal which may be nickel (Ni) or iron (Fe) or cobalt (Co) or a composition comprising Ni—Fe—Co, Ni—Fe, Ni—Co, Co—Fe.Type: GrantFiled: January 5, 2000Date of Patent: March 12, 2002Assignee: Turbocoating SpAInventor: Nelso Antolotti
-
Patent number: 6344093Abstract: A high tensile strength steel product for high heat input welding having excellent toughness in the heat-affected zone and having a tensile strength of at least 490 MPa contains, in terms of percent by weight, from about 0.05% to about 0.18% of C, 0.6% or less of Si, from about 0.80% to about 1.80% of Mn, 0.005% or less of Al, 0.030% or less of P, 0.004% or less of S, 0.005% or less of Nb, from about 0.04% to about 0.15% of V, from about 0.0050% to about 0.00150% of N, and from about 0.010% to about 0.050% of Ti, the ratio of the Ti content to the Al content, Ti/Al, satisfying 5.0 or more, and further contains at least one of from about 0.0010% to about 0.0100% of Ca and from about 0.0010% to about 0.0100% of REM, and the balance being Fe and incidental impurities.Type: GrantFiled: May 9, 2000Date of Patent: February 5, 2002Assignee: Kawasaki Steel CorporationInventors: Akio Ohmori, Fumimaru Kawabata, Keniti Amano
-
Publication number: 20020011284Abstract: The invention relates to a process for producing seamless line pipes within the quality grade range X 52 to X 90, with a stable yield strength up to a temperature of use of 200° C., and with an essentially constant stress-strain characteristic, by hot-rolling a pipe blank made from a steel which contains the following alloying elements (% by weight): 1 C 0.06-0.18% Si max. 0.40% Mn 0.80-1.40% P max. 0.025% S max. 0.010% Al 0.010-0.060% Mo max. 0.50% V max. 0.10% Nb max. 0.10% N max. 0.015% W >0.30-1.Type: ApplicationFiled: July 15, 1999Publication date: January 31, 2002Inventors: INGO VON HAGEN, MARKUS RING, GERD HEINZ, BERNHARD KOSCHLIG, KURT NIEDERHOFF
-
Publication number: 20020007871Abstract: An object is to provide a heat-resistant steel which can be produced at a low cost but possesses an excellent high-temperature strength. A high-strength heat-resistant steel is provided which comprises C in an amount of 0.06 to 0.15% by weight, Si in an amount of 1.5% by weight or less, Mn in an amount of 0.5 to 1.5% by weight, V in an amount of 0.05 to 0.3% by weight, and at least one of Nb, Ti, Ta, Hf, and Zr, in an amount of 0.01 to 0.1% by weight, the balance being Fe and unavoidable impurities, wherein the high-strength heat-resistant steel has a structure consisting mainly of a bainite structure.Type: ApplicationFiled: August 3, 2001Publication date: January 24, 2002Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Nobuhiko Nishimura, Masahiro Umata, Masashi Ozaki
-
Patent number: 6333001Abstract: A micro-alloyed steel for rolling bearings and especially for HBU/THU forgings with improved yield strength in “as forged condition. The steel has the following composition 0.5-0.7% C, 0-0.6% Si, 0.4-1.2% Mn, 0-0.035% S, 0.05-2.0% V, 80-160 ppm N, the remainder iron and ordinary impurities.Type: GrantFiled: April 29, 1998Date of Patent: December 25, 2001Assignee: Ovaka SteelInventors: Rainer R. Leppänen, John Beswick
-
Patent number: 6312529Abstract: Steel compositions and processes are described that provide optimum resistance to austenite grain coarsening in cold-formed and carburized components for automotive and machine structural applications. The steel compositions include, in weight percent, 0.1-0.3% C 150-220 ppm N and a grain refining addition selected from the group consisting of Al, V plus Al and Nb plus Al, the balance comprising iron and other alloying elements typically found in carburizing grades of steel. The steels are processed by reheating to a temperature in the vicinity of solution temperature of the least soluble species of grain refining precipitate and then hot worked. The hot-worked steel is cooled at an accelerated rate to 500° C. and then subcritically annealed, cold formed in at least one operation with intermediate anneals subcritically annealed after the last cold-forming operation, and carburized quenched and tempered (6).Type: GrantFiled: October 7, 1999Date of Patent: November 6, 2001Assignee: The Timken CompanyInventors: Michael J. Leap, James C. Wingert
-
Patent number: 6258184Abstract: A BCC type hydrogen-absorbing alloy, which uses a ferroalloy, is advantageous from the aspect of the production cost and exhibits excellent hydrogen absorption and desorption characteristics due to a fine structure constituted by spinodal decomposition even when the iron component is increased. The hydrogen-absorbing alloy is expressed by the general formula AxVayBz, where A is at least one of Ti and Zr, Va is at least one member of the Group Va elements of the Periodic Table consisting of V, Nb and Ta, and B contains at least Fe and is at least one member selected from the group consisting of Cr, Mn, Co, Ni, Cu, Al, Mo and W, each of x, y and z satisfies the relation, in terms of of the atomic number ratio, 0≦x≦70, 0≦y≦50, x+y+z=100, and x/z=0.25 to 2.0, the phase of the body-centered cubic structure is at least 50% in terms of the phase fraction and its lattice constant is at least 0.2950 nm but not greater than 0.3100 nm.Type: GrantFiled: April 13, 1999Date of Patent: July 10, 2001Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hideki Iba, Toshihiro Mori, Yasuhide Kurimoto
-
Patent number: 6217675Abstract: Cold rolled steel sheets having improved bake hardenability is provided. Specifically, the present invention relates to a cold rolled steel sheet, with improved bake hardenability, comprising an ultra low carbon steel containing titanium and/or niobium, wherein the relationship between the contents of carbon and molybdenum in solid solution being regulated in a specified range, and a cold rolled steel sheet, with improved bake hardenability, which further contains a specified amount of boron in addition to the above constituents.Type: GrantFiled: February 28, 2000Date of Patent: April 17, 2001Assignee: Nippon Steel CorporationInventors: Hirokazu Taniguchi, Kazumasa Yamazaki, Koichi Goto
-
Patent number: 6187117Abstract: A method of making a weathering grade steel plate includes the steps of establishing a minimum yield strength:plate thickness target from one of 50 KSI:up to 4″, 65 KSI:up to 1.5″, and 70 KSI:up to 1.25″. A modified weathering grade alloy composition is cast into a slab employing effective levels of manganese, carbon, niobium, vanadium, nitrogen, and titanium. The cast slab is heated and rough rolled to an intermediate gauge plate. The intermediate gauge plate is controlled rolled and subjected to one of air cooling or accelerated cooling depending on the minimum yield strength and thickness target. With the controlled alloy chemistry, rolling and cooling, the final gauge plate exhibits discontinuous yielding and can be used for applications requiring a 70 KSI minimum yield strength in plate thicknesses up to 1.25″, a 65 KSI minimum yield strength in plate thickness up to 1.50″ and a 50 KSI minimum yield strength for plates as thick as 4″.Type: GrantFiled: January 20, 1999Date of Patent: February 13, 2001Assignees: Bethlehem Steel Corporation, Pohang Iron & Steel Co., Ltd.Inventors: Yulin Shen, Richard L. Bodnar, Jang-Yong Yoo, Wung-Yong Choo
-
Patent number: 6149862Abstract: An alloy and alloy product has about 1.3% to 1.7% by weight concentration of silicon, along with iron, alloying elements, and inevitable impurities and exhibits improved resistance to hydrogen embrittlement and sulfide stress cracking in an intensive hydrogen-charged medium wherein H from the medium acts as an alloying element. The alloy is characterized by an Fe--Si--H system wherein Fe is a donor element with respect to Si and Si is an acceptor element with respect to Fe. Further, the alloying elements are Fe--Si noninteractive elements with respect to Fe and Si, such that the presence of the alloying elements are not donor or acceptor elements with respect to Fe or Si. In several alloy compositions, the alloy has between about 1.38% to 1.63% weight Si. The alloy may further include between about 0.10% to 0.25% weight of C. In one particular alloy, the alloy composition includes about 0.18% of C; although, in one alloy product, an alloy is used having about 0.16% to 0.24% weight of C.Type: GrantFiled: May 18, 1999Date of Patent: November 21, 2000Assignee: The Atri Group Ltd.Inventors: Naum I. Gliklad, Avgust B. Kuslitskiy, Leonid A. Kuslitskiy
-
Patent number: 6143242Abstract: A steel for machine structural use which realizes excellent fracture splitability and fatigue strength in its as-hot forged formed articles, and which comprises, based on weight, 0.2 to less than 0.35% of C, 0.1 to 1.1% of Si, 0.1 to less than 0.3% of Mn, 0.01 to 0.2% of P, 0.01 to 0.2% of S, greater than 0.2 to 0.5% of V, 0.01 to 0.1% of Ti, 0.005 to 0.02% of N and the balance of Fe and unavoidable impurities. The steel further comprises, if necessary, one or at least two of the following elements in the following amount or amounts: 0.005 to 0.05% of Al and/or 0.05 to 0.5% of Nb, 0.1 to 0.5% of Cr and 0.1 to 0.5% of Mo.Type: GrantFiled: April 30, 1999Date of Patent: November 7, 2000Assignees: Nippon Steel Corporation, Toyoda Jidosha Kabushiki KaishaInventors: Hiromasa Takada, Masayuki Shibata, Motohide Mori, Atsuo Tanaka
-
Patent number: 6036790Abstract: The medium carbon, microalloyed forging steel for machine structural use has a small deformation upon fracture in a hot-rolled, hot-forged, or any other hot-worked state, has an inexpensive ferrite-pearlitic microstructure and consists of C: 0.3 to 0.6 wt %, Si: 0.1 to 2.0 wt %, Mn: 0.1 wt % or more and less than 0.4 wt %, P: 0.01 to 0.1 wt %, S: 0.01 to 0.2 wt %, V: more than 0.15 wt % and up to 0.4 wt %, and the balance: Fe and unavoidable impurities, in which the unavoidable impurities include less than 0.005 wt % N. The microalloyed forging steel for machine structural use may further contain Al: 0.005 to 0.05 wt %, one or both of Ti: 0.005 to 0.05 wt % and Nb: 0.05 to 0.2 wt %, and/or one or both of Cr: 0.1 to 0.5 wt % and Mo: 0.1 to 0.5 wt %.Type: GrantFiled: January 25, 1999Date of Patent: March 14, 2000Assignee: Nippon Steel CorporationInventors: Hiromasa Takada, Tetsuro Hashiguchi, Hideo Kanisawa
-
Patent number: 6033792Abstract: A recording head for recording data onto a recording medium is provided with a thin film formed of the following compound Fe.sub.100-a-b-c X.sub.a Y.sub.b Z.sub.c, wherein X is at least one element selected from the group consisting of Nb, Ta, Hf and Zr, Y is one or two elements selected from the group consisting of Cr, Ru, Al, Si, Ti and Rh, and Z is at least one element selected from the group consisting of C and N, and wherein 5.ltoreq.a.ltoreq.20, 0.5.ltoreq.b.ltoreq.15, 1.ltoreq.c.ltoreq.20, and 0.5.ltoreq.a/c.ltoreq.0.7, the carbide or the nitride of the element X having an average grain size of not larger than 3 nm. This way, increased corrosion resistance is provided without substantially reducing magnetic characteristics such as saturation and coercive force. A recording apparatus, such as a VTR, including such a recording head is disclosed as well as a recording medium formed using this thin film.Type: GrantFiled: October 19, 1998Date of Patent: March 7, 2000Assignee: Hitachi, Ltd.Inventors: Fumiyoshi Kirino, Shigekazu Otomo, Nagatugu Koiso, Noriyuki Kumasaka, Takeshi Miura
-
Patent number: 5993570Abstract: A high strength, high toughness, low carbon/low manganese steel is provided that is further resistant to stepwise cracking and sulfide stress cracking. The steel can be produced by conventional or thin slab casting techniques using normal speeds, with low manganese segregation levels. The steels are excellent candidates for linepipe applications in severe sour gas service.Type: GrantFiled: June 20, 1997Date of Patent: November 30, 1999Assignee: American Cast Iron Pipe CompanyInventor: John Malcolm Gray
-
Patent number: 5954896Abstract: According to the present invention, an ultra low carbon steel with Nb, Ti, or Nb-Ti added thereto is used as a material, and (% S as MnS)/(total S content) is regulated to not more than 0.2 with (% C as carbosulfide)/(total C content) being regulating to not more than 0.7, thereby efficiently precipitating carbosulfide in a .gamma. temperature region during hot rolling and thus reducing the amount of C in solid solution to ensure the homogeneity of the material over the whole length of a coil and to markedly improve the workability.Type: GrantFiled: October 18, 1996Date of Patent: September 21, 1999Assignee: Nippon Steel CorporationInventors: Kazuo Koyama, Masayoshi Suehiro, Naoki Yoshinaga, Natsuko Hashimoto
-
Patent number: 5897967Abstract: A galvannealed steel sheet suited for use in automobiles, and a manufacturing method thereof. The steel sheet has tensile strength of 340 MPa or higher and paint bake hardenability of 10 MPa or higher, and excellent resistance to powdering when press formed, and excellent resistance to chipping in cold regions. The base metal of the galvannealed steel sheet consists essentially of C: 0.004-0.008%, Si: 2.5.times.P (%)-0.20%, Mn: 0.10-0.40%, P: 0.017-0.045%, sol. Al: 0.003-0.08%, Ti: 0.002-0.015%, Nb: 0.010-0.030 %, wherein Ti (%)+Nb (%): 0.012-0.035%. A steel sheet of the chemical composition described above is hot-dip galvanized, heated up to a Fe--Zn alloying temperature at a heating velocity of 20.degree. C./sec or higher, and upon completion of the Fe--Zn alloying process, cooled down from the Fe--Zn alloying temperature at a cooling velocity of 10.degree. C./sec or higher.Type: GrantFiled: July 16, 1997Date of Patent: April 27, 1999Assignee: Sumitomo Metal Industries, Ltd.Inventors: Masahiko Hori, Toshio Nakamori, Yoshiaki Nakazawa, Yasuyuki Tanno
-
Patent number: 5873955Abstract: A recording head for recording data onto a recording medium is provided with a thin film formed of the following compound Fe.sub.100-a-b-c X.sub.a Y.sub.b Z.sub.c, wherein X is at least one element selected from the group consisting of Nb, Ta, Hf and Zr, Y is one or two elements selected from the group consisting of Cr, Ru, Al, Si, Ti and Rh, and Z is at least one element selected from the group consisting of C and N, and wherein 5.ltoreq.a.ltoreq.20, 0.5.ltoreq.b.ltoreq.15, 1.ltoreq.c.ltoreq.20, and 0.5.ltoreq.a/c.ltoreq.0.7, the carbide or the nitride of the element X having an average grain size of not larger than 3 nm. This way, increased corrosion resistance is provided without substantially reducing magnetic characteristics such as saturation and coercive force. A recording apparatus, such as a VTR, including such a recording head is disclosed as well as a recording medium formed using this thin film.Type: GrantFiled: February 1, 1996Date of Patent: February 23, 1999Assignee: Hitachi, Ltd.Inventors: Fumiyoshi Kirino, Shigekazu Otomo, Nagatugu Koiso, Noriyuki Kumasaka, Takeshi Miura
-
Patent number: 5853903Abstract: A cold-rolled steel sheet or a zinc or zinc alloy layer coated steel sheet containing 0.0010 to 0.01 wt % of C and having a steel composition containing one or two kinds of 0.005 to 0.08 wt % of Nb and 0.01 to 0.07 wt % of Ti in the ranges given by {(12/93)Nb+(12/48)Ti*} .gtoreq.0.0005, 0.ltoreq.C-{(12/93)Nb+(12/48)Ti*}.ltoreq.0.0015, and Ti*=Ti-{(48/32)S+(48/14)N } , in which a bake hardenability BH f the steel sheet at 170.degree. C..times.20 min after 2% tensile prestrain is 10 to 35 MPa and the BH (MPa) and a yield strength YP (MPa) of the steel sheet satisfy the ranges given by BH.gtoreq.exp(-0.115.multidot.YP+23.0) and 0.67.multidot.BH+160.ltoreq.YP.ltoreq.-0.8.multidot.BH+280.Type: GrantFiled: April 28, 1997Date of Patent: December 29, 1998Assignee: NKK CorporationInventors: Yoshihiro Hosoya, Fusato Kitano, Yasunobu Nagataki
-
Patent number: 5851481Abstract: A steel alloy having 0.44-0.52 wt. % C, 1.1-1.6 wt. % Mn, 0.15-0.35 wt. % Si, a maximum of 0.04 wt. % P, a maximum of 0.05 wt. % S, a maximum of 0.45 wt. % Cu and 0.06-0.09 wt. % V. A No. 5 mine roof bolt formed from the steel alloy has a minimum yield strength of 90,000 psi. A mine roof bolt having a cross-sectional diameter of 7/8 inch or 1 inch and formed from the steel alloy has a minimum yield strength of 100,000 psi.Type: GrantFiled: May 27, 1997Date of Patent: December 22, 1998Assignee: Jennmar CorporationInventors: John C. Stankus, Frank Calandra, Jr., Michael Cokus, Ray W. Goetz
-
Patent number: 5830287Abstract: A hot-worked, fully dense, wear resistant, vanadium-rich, powder metallurgy cold work tool steel article having improved impact toughness. This is achieved by controlling the amount, composition and size of the primary carbides and by insuring that substantially all the primary carbides remaining after hardening and tempering are MC-type vanadium-rich carbides. The article is produced by hot isostatic compacting of nitrogen atomized powder particles.Type: GrantFiled: April 9, 1997Date of Patent: November 3, 1998Assignee: Crucible Materials CorporationInventors: Kenneth E. Pinnow, William Stasko
-
Patent number: 5817191Abstract: An iron-based, cobalt-containing soft magnetic alloy suitable for use as a core in a magnetic switch or other exciting circuits has a cobalt content of 6 through 30 weight percent, at least one of the elements chromium, molybdenum, vanadium and tungsten in range of 3 through 8 weight percent, and a remainder iron, possibly including inconsequential contaminants. The alloy has a coercive field strength of lower than or equal to 3.2 A/cm, and a saturation flux density of greater than 1.9 Tesla.Type: GrantFiled: August 26, 1997Date of Patent: October 6, 1998Assignee: Vacuumschmelze GmbHInventors: Kurt Emmerich, Hartwin Weber, Hermann Wegerle
-
Patent number: 5743972Abstract: A heavy-wall steel having a flange thickness of about 40 mm or more and possessing excellent strength, toughness, weldability, and seismic resistance capable of being used for structure members such as columns and beams of high-rise buildings. The heavy-wall steel has a tensile strength of about 490-690 MPa, a yield ratio of about 80% or less, and Charpy absorbed energy at 0.degree. C. of about 27 J or more at the center in terms of thickness of the flange portion in each of the rolling direction, the direction perpendicular to the rolling direction, and the plate-thickness direction.Type: GrantFiled: August 27, 1996Date of Patent: April 28, 1998Assignee: Kawasaki Steel CorporationInventors: Tatsumi Kimura, Kiyoshi Uchida, Fumimaru Kawabata, Keniti Amano, Takanori Okui
-
Patent number: 5718776Abstract: In the present invention, a steel product having a specified composition comprising by weight C: 0.02 to 0.25%, Si: 0.01 to 2.0%, Mn: 0.30 to 1.5%, Al: 0.003 to 0.10%, Nb: 0.005 to 0.10%, and Mo: 0.05 to 1.00% with the balance consisting of Fe and unavoidable impurities is used to prepare a steel plate having a thickness of 3 to 100 mm (the upper limits of the Nb and Mo contents each being 0.025% particularly for a plate thickness of 3 to 25 mm), and the ratio of the yield stress of the steel plate at a temperature T, .sigma..sub.yT, to the yield stress of the steel plate at room temperature, .sigma..sub.y, over the temperature range of room temperature to 600.degree. C. is brought to a value falling within the following range:1.00-1.083.times.10.sup.-3 T<(.sigma..sub.yT /.sigma..sub.y)<1.16-5.101.times.10.sup.-4 T.Further, the constituents of a welding material are specified to bring the .gamma..sub.3 transformation temperature to below 620.degree. C.Type: GrantFiled: March 20, 1996Date of Patent: February 17, 1998Assignee: Nippon Steel CorporationInventors: Atsuhiko Yoshie, Takashi Fujita, Yokimi Kawashima, Masaaki Nagahara, Kazuhiro Kojima, Tadashi Kasuya, Yukihiko Horii, Tsukasa Yoshimura
-
Patent number: 5686194Abstract: A laminated steel sheet for dry forming drawn and ironed cans wherein the steel sheet comprises a steel containing iron, carbon, manganese, aluminum, silicon, phosphorus, sulfur and optionally titanium and/or niobium and wherein the steel sheet is electrolytically chromium-coated and covered on both sides with a 10-50 .mu.m thick thermoplastic resin layer. The sheet sheet has a crystal grain size of 8-30 .mu.m, a surface roughness of 0.05-0.6 .mu.m and a thickness of 0.15-0.3 mm.Type: GrantFiled: September 7, 1994Date of Patent: November 11, 1997Assignee: Toyo Kohan Co., Ltd.Inventors: Keiichi Shimizu, Humio Kunishige, Junichi Tanabe, Atsuo Tanaka
-
Patent number: 5651938Abstract: An iron composition and method for processing the composition that produces a steel alloy having enhanced low temperature toughness, without compromising other desirable mechanical properties, is described. The composition can be used to produce devices, such as saw chain, particularly useful for low temperature applications. In general, the steel composition comprises from about 0.2 weight percent to about 0.4 weight percent nickel, from about 0.2 to about 0.4 weight percent chromium, from about 0.5 weight percent to less than about 1.0 weight percent carbon, from about 0.3 to about 0.5 weight percent manganese, and from about 0.08 weight percent to about 0.20 weight percent molybdenum. After heat treating, the steel composition has an average fracture toughness of greater than about 42 ksi in.sup.1/2, and an average modified Charpy energy-to-failure of greater than about 2 ft.lbs at temperatures greater than about -20.degree. F.Type: GrantFiled: May 1, 1995Date of Patent: July 29, 1997Assignee: Blount, Inc.Inventors: Iain A. Thomson, Larry G. Ward, James Peck, Dwayne E. Lewis
-
Patent number: 5435827Abstract: A high speed steel which has been manufactured power metallurgically and has the following chemical composition in weight-%: 0.6-0.9 C, from traces to max 1.0 Si, from traces to max 1.0 Mn, 3-5 Cr, 0-5 Mo, 0-10 W, where (Mo+W/2) shall be at least 4, 0.7-2 V, max 14 Co, 0.7-1.5 Nb, with the balance being substantially iron, incidental impurities and accessory elements in normal amounts. The steel is suited for tools the use of which require a high toughness, a suitable hardness and strength.Type: GrantFiled: February 4, 1994Date of Patent: July 25, 1995Assignee: Erasteel Kloster AktiebolagInventor: Henry Wisell