| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 420084000 | Lead, bismuth, selenium, tellurium or calcium containing | 57 |
| 20080240970 | Austenitic free-cutting stainless steel - The present invention relates to an austenitic free-cutting stainless steel, containing: by weight percent, 0.500% or less of C; 0.01 to 5.00% of Si; 0.01 to 10.00% of Mn; 5.00 to 25.00% of Ni; 7.50 to 30.00% of Cr; 0.300% or less of N; more than 0.0100% but not more than 0.1000% of 0; 0.0020 to 0.1000% of B; 0.300% or less of Al; and the remainder of Fe and inevitable impurities, the steel satisfying the following formula (1): | 10-02-2008 |
| 20080247900 | Component for Machine Structure, Method of Producing the Same and Material for Induction Hardening - There is provided a component for machine structure having a hardened layer through an induction hardening in at least a part thereof, and more improving fatigue strengths as compared with the conventional ones, in which the hardened layer has a hardness Hv of not less than 750 and an average grain size of prior austenite grains is not more than 7 μm over a full thickness of the hardened layer. | 10-09-2008 |
| 20090004041 | High Strength, High Toughness Rotating Shaft Material - An age hardenable, martensitic steel alloy that provides high strength, high toughness, and good low cycle fatigue life and a method of making same are disclosed. The alloy comprises a matrix having a weight percent composition consisting essentially of about | 01-01-2009 |
| 20090104069 | LINEPIPE STEEL - A method of producing coil plate on a hot strip mill is disclosed. The method includes coiling hot rolled coil plate strip at a temperature that is selected (a) to minimise precipitation of Cr/Mo carbides or (b) so that any Cr/Mo carbides that form are sufficiently fine that they go into solution in any subsequent heat treatment of coil plate made from the strip. | 04-23-2009 |
| 20090169414 | LOW-CARBON SULFUR-CONTAINING FREE-CUTTING STEEL WITH EXCELLENT CUTTABILITY - A low-carbon resulfurized free-machining steel is excellent in machinability and contains 0.02% to 0.15% by mass of C; 0.004% by mass or less (exclusive of 0%) of Si; 0.6% to 3% by mass of Mn; 0.02% to 0.2% by mass of P; 0.35% to 1% by mass of S; 0.005% by mass or less (exclusive of 0% by mass) of Al; 0.008% to 0.03% by mass of 0; and 0.007% to 0.03% by mass of N, with the remainder being iron and inevitable impurities, in which the ratio [Mn]/[S] of the manganese content [Mn] to the sulfur content [S] is within the range of 3 to 4, and the carbon content [C], the manganese content [Mn] and the nitrogen content [N] satisfy the following Expression (1): 10[C]×[Mn] | 07-02-2009 |
| 20090274572 | High-Strength Pearlitic Steel Rail Having Excellent Delayed Fracture Properties - The invention provides a high-strength pearlitic steel rail, which is inexpensive, and has a tensile strength of 1200 MPa or more, and is excellent in delayed fracture properties. Specifically, the rail contains, in mass percent, C of 0.6 to 1.0%, Si of 0.1 to 1.5%, Mn of 0.4 to 2.0%, P of 0.035% or less, S of 0.0005 to 0.010%, and the remainder is Fe and inevitable impurities, wherein tensile strength is 1200 MPa or more, and size of a long side of an A type inclusion is 250 mm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of A type inclusions, each having a size of a long side of 1 mm to 250 mm, is less than 25 per observed area of 1 mm | 11-05-2009 |
| 20090274573 | Machine Structural Steel Excellent in Machinability and Strength Properties - The invention provides a machine structural steel excellent in machinability and strength properties that has good machinability over a broad range of machining speeds and also has high impact properties and high yield ratio, which machine structural steel comprises, in mass %, C: 0.1 to 0.85%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.0%, P: 0.005 to 0.2%, S: 0.001 to 0.15%, total Al: greater than 0.05% and not greater than 0.3%, Sb: less than 0.0150% (including 0%), and total N: 0.0035 to 0.020%, solute N being limited to 0.0020% or less, and a balance of Fe and unavoidable impurities. | 11-05-2009 |
| 20090285713 | LOW ALLOY STEEL FOR HIGH-PRESSURE HYDROGEN GAS ENVIRONMENT AND CONTAINER FOR HIGH-PRESSURE HYDROGEN - Provided is a low alloy steel for high-pressure hydrogen gas environments, which contains, by mass percent, C: 0.15 to 0.60%, Si: 0.05 to 0.5%, Mn: 0.05 to 3.0%, P: not more than 0.025%, S: not more than 0.010%, Al: 0.005 to 0.10%, Mo: 0.5 to 3.0%, V: 0.05 to 0.30%, O (oxygen): not more than 0.01%, N: not more than 0.03%, and the balance Fe and impurities, and has tensile strength of not less than 900 MPa. This low alloy steel desirably contains B of 0.0003 to 0.003%, but in this case, N is limited to not more than 0.010%. It is desirable to contain at least one among Cr, Nb, Ti, Zr, and Ca. The contents of Mo and V desirably satisfy the following formula (1): | 11-19-2009 |
| 20090304543 | Steel for nitrocarburizing use, steel product for nitrocarburizing use and crankshaft - A steel for nitrocarburizing use, which comprises by mass percent, C: more than 0.45% to not more than 0.60%, Si<0.50%, Mn: more than 1.30% to not more than 1.70%, P≦0.05%, S: 0.02 to 0.10%, Cr≦0.30% and N: more than 0.007% to not more than 0.030%, and which further contains one or two elements selected from Al: more than 0.010% to not more than 0.10% and Ti: more than 0.005% to not more than 0.035%, with Al+Ti being 0.015% or more, with the balance being Fe and impurities, wherein V among the impurities is not more than 0.010%, and further satisfies the following 2 formulas, has high fatigue strength and excellent straightenability after the nitrocarburizing treatment, without performing the expensive heat treatment of quenching and tempering. Consequently, they are suitable as raw materials for nitrocarburized components: | 12-10-2009 |
| 20100028196 | High Strength Spring Steel and High Strength Heat Treated Steel Wire for Spring - The present invention provides a high strength heat treated steel wire for spring having a tensile strength of 2000 MPa or more which is coiled in the cold state and can achieve both sufficient atmospheric strength and coilability and spring steel used for that steel wire, that is, a high strength heat treated steel wire for a spring characterized by comprising, by mass %, C: 0.5 to 0.9%, Si: 1.0 to 3.0%, Mn: 0.1 to 1.5%, Cr: 1.0 to 2.5%, V: over 0.15 to 1.0%, and Al: 0.005% or less, controlling N to 0.007% or less, further containing one or two of Nb: 0.001 to less than 0.01% and Ti: 0.001 to less 0.005%, and having a tensile strength of 2000 MPa or more, having cementite-based spheroidal carbides and alloy-based spheroidal carbides in a microscopic visual field satisfying an area percentage of carbides with a circle equivalent diameter of 0.2 μm or more of 7% or less and a density of carbides with a circle equivalent diameter of 1 grain/μm | 02-04-2010 |
| 20100054984 | MACHINING STEEL SUPERIOR IN MANUFACTURABILITY - The present invention provides machining steel superior in machinability, accompanied with little melt loss of plate refractories of continuous casting sliding nozzles, and superior in ductility in hot rolling and able to prevent deterioration of the surface properties due to hot rolling, containing, by mass %, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.3 to 3.0%, P: 0.001 to 0.2%, S: 0.30 to 0.60%, B: 0.0003 to 0.015%, O: 0.005 to 0.012%, Ca: 0.0001 to 0.0010%, and Al≦0.01%, having an N content satisfying N≧0.0020% and 1.3×B−0.0100≦N≦1.3×B+0.0034, and having a balance of Fe and unavoidable impurities, wherein, regarding the MnO in the steel, in a cross-section of the steel material perpendicular to the rolling direction, the area of MnO of a circle equivalent diameter of 0.5 μm or more being 15% or less of the area of the total Mn-based inclusions. | 03-04-2010 |
| 20100074794 | STEEL PLATE FOR LINEPIPE HAVING ULTRA-HIGH STRENGTH AND EXCELLENT LOW TEMPERATURE TOUGHNESS AND MANUFACTURING METHOD OF THE SAME - A steel plate for linepipes having ultra-high strength and excellent low temperature toughness, and a method for manufacturing the same are disclosed. The steel plate has a strength of 930 MPa or more and excellent toughness even with much smaller amounts of alloying elements than that of conventional steel plates, and a method for manufacturing the same. The steel includes by weight %: 0.03˜0.10% C; 0˜0.6% Si; 1.6-2.1% Mn; 0˜1.0% Cu; 0-1.0% Ni; 0.02-0.06% Nb; 0-0.1% V; 0.1-0.5% Mo; 0-1.0% Cr; 0.005-0.03% Ti; 0.01-0.06% Al; 0.0005-0.0025% B; 0.001-0.006% N; 0-0.006% Ca; 0.02% or less P; 0.005% or less S; and the balance Fe and unavoidable impurities. The microstructure includes at least about 75 area percent of a mixture of bainitic ferrite and acicular ferrite. | 03-25-2010 |
| 20100080728 | HIGH-STRENGTH THIN STEEL SHEET - The present invention is the thin steel sheet containing C, Si, Mn, P, S, Al, Mo, Ti, B, and N wherein a value Z calculated by the equation described below is 2.0-6.0, an area ratio against all the structure is 1% or above for retained austenite and 80% or above for total of bainitic ferrite and martensite, a mean axis ratio of the retained austenite crystal grain is 5 or above, and tensile strength is 980 MPa or above. | 04-01-2010 |
| 20100111749 | High-strength steel sheets excellent in hole-expandability and ductility - High-strength steel sheet excellent in hole-expandability and ductility, characterized by; comprising, in mass %, C: not less than 0.01% and not more than 0.20%, Si: not more than 1.5%, Al: not more than 1.5%, Mn: not less than 0.5% and not more than 3.5%, P: not more than 0.2%, S: not less than 0.0005% and not more than 0.009%, N: not more than 0.009%, Mg: not less than 0.0006% and not more than 0.01%, O: not more than 0.005% and Ti: not less than 0.01% and not more than 0.20% and/or Nb: not less than 0.01% and not more than 0.10%, with the balance consisting iron and unavoidable impurities, having Mn %, Mg %, S % and O % satisfying equations (1) to (3), and having the structure primarily comprising one or more of ferrite, bainite and martensite. | 05-06-2010 |
| 20100124515 | Machine structural steel excellent in machinability and strength properties - The invention provides a machine structural steel excellent in machinability and strength properties that has good machinability over a broad range of machining speeds and also has high impact properties and high yield ratio, which machine structural steel comprises, in mass %, C: 0.1 to 0.85%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.0%, P: 0.005 to 0.2%, S: 0.001 to 0.15%, total Al: greater than 0.05% and not greater than 0.3%, Sb: less than 0.0150% (including 0%), and total N: 0.0035 to 0.020%, solute N being limited to 0.0020% or less, and a balance of Fe and unavoidable impurities. | 05-20-2010 |
| 20100143179 | LEAD FREE FREE-CUTTING STEEL AND ITS USE - A lead free free-cutting steel is described having the following composition in percent by weight: C 0.85-1.2 Si 0.1-0.6 Mn 0.4-1.2 P max 0.05 S 0.04-0.3 Cr max 2 Ni max 1 Mo max 0.5 Cu max 2 Al max 0.1 B max 0.008 Bi+Se+Te max 0.005 Ti+Nb+Zr+V max 0.2 balance Fe and normally occurring impurities. The steel is mainly intended for small/thin dimensions and/or low cutting speeds during manufacture of a product formed of the steel. | 06-10-2010 |
| 20100143180 | HOT-FORGING MICRO-ALLOYED STEEL AND HOT-ROLLED STEEL EXCELLENT IN FRACTURE-SPLITABILITY AND MECHINABILITY, AND COMPONENT MADE OF HOT-FORGED MICROALLOYED STEEL - The invention provides a hot-forging micro-alloyed steel and a hot-rolled steel which achieve excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. | 06-10-2010 |
| 20100150772 | HOT-FORMING STEEL ALLOY - A hot-forming steel alloy comprising, in addition to iron and impurity elements, carbon, silicon, manganese, chromium, molybdenum, vanadium and nitrogen within the concentration ranges set forth in the claims. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way. | 06-17-2010 |
| 20100172786 | HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT ELONGATION, STRETCH FLANGEABILITY AND WELDABILITY - The present invention provides a high-strength steel sheet which has a 980 MPa class tensile strength as well as has excellent elongation, stretch flangeability and weldability, and also has excellent anti-delayed fraction property. The high-strength steel sheet comprises steel satisfying: C: 0.12 to 0.25%, Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities, wherein a ratio of the contents of Si and C (Si/C) is within the range from 7 to 14 in terms of a mass ratio, and a microstructure in a longitudinal section comprises, by an occupancy ratio based on the entire structure, 1) bainitic ferrite: 50% or more, 2) lath-type residual austenite: 3% or more, and 3) block-type residual austenite: 1% or more to ½×occupancy ratio of lath-type residual austenite, and 4) average size of block-type second phase is 10 μm or less. | 07-08-2010 |
| 20100172787 | NOVEL ADDITIVE COMPRISING LEAD AND/OR A LEAD ALLOY INTENDED TO TREAT BATHS OF LIQUID STEEL - The present invention relates to an additive in the form of flux-cored wire for treating baths of liquid steel with a view to obtaining steels having a high lead content. The additive comprising metallic lead and/or one or more lead alloys according to the invention for treating baths of liquid steel, and is in the form of flex-cored wire composed of a metal sheath and a finely divided filling material, the latter being composed of a powder of metallic lead and/or of lead alloy and of a powder containing a material capable of releasing a gas, which is inert with respect to the liquid steel, at the temperature of the liquid steel bath. Characteristically, the powder of metallic lead and/or of lead alloy includes a particle size fraction G | 07-08-2010 |
| 20100183472 | HIGH STRENGTH STEEL SHEET EXCELLENT IN BENDING WORKABILITY AND FATIGUE STRENGTH - The present invention provides a high strength steel sheet with 780 MPa class tensile strength excellent in bending workability and fatigue strength. The high strength steel sheet is (1) a steel sheet whose steel composition contains: C: 0.05-0.20%; Si: 0.6-2.0%; Mn: 1.6-3.0%; P: 0.05% or below; S: 0.01% or below; Al: 0.1% or below; and N: 0.01% or below, the balance comprising iron and inevitable impurities, in which (2) a microstructure comprises a polygonal ferrite structure and a structure formed by low-temperature transformation, in which, when a sheet plane located at a depth of 0.1 mm from a surface of the steel sheet is in the observation under a scanning electron microscope with respect to twenty sights in total in different positions in the sheet-width direction, the maximum value of the areal proportion of the polygonal ferrite (Fmax) and the minimum value of the areal proportion of the ferrite (Fmin) in a 50 μm×50 μm area in each sight satisfy Fmax≦80%, Fmin≧10%, and Fmax−Fmin≦40%. | 07-22-2010 |
| 20100189590 | MARAGING STEEL AND MARAGING STEEL FOR METALLIC BELT - A maraging steel for metallic belts which has a composition capable of being reduced in the content of TiN serving as a starting point for fatigue fracture in a high-cycle-rate region. The composition facilitates nitriding to heighten the surface hardness. The steel has a nitrided surface layer having increased compressive residual stress and hence improved flexural fatigue strength. In the steel, former austenite crystal grains have been reduced in size in order to secure higher strength and higher ductility. The maraging steel consists of, by mass %, up to 0.01% C, up to 0.1% Si, up to 0.1% Mn, up to 0.01% P, up to 0.005% S, 17.0-22.0% Ni, 0.1-4.0% Cr, 3.0-7.0% Mo, from more than 7.0 to 20.0% Co, up to 0.1% Ti, up to 2.5% Al, up to 0.03% N, up to 0.005% 0, up to 0.01% B (exclusive zero), and the balance of Fe and unavoidable impurities, wherein Co/3+Mo+4Al is 8.0-15.0%. | 07-29-2010 |
| 20100209283 | HOT-ROLLED STEEL SHEET AND COLD-ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREOF - A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof are provided. The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D (μm) satisfy the relation defined by the formula (3) given below: | 08-19-2010 |
| 20100221138 | HIGH-STRENGTH COMPOSITE STEEL SHEET HAVING EXCELLENT MOLDABILITY AND DELAYED FRACTURE RESISTANCE - The present invention provides a high-strength composite steel sheet which has a tensile strength of 980 MPa class as well as excellent and excellent anti-delayed fraction property, and also has excellent spot-weldability. The high-strength composite steel sheet comprises a steel satisfying: C: 0.10 to 0.25% (% by mass in case of a chemical component, the same shall apply hereinafter), Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities; the contents of Si, Al, Mn and Cr satisfy the relationship of “(Si+Al)/Mn or (Si+Al)/(Mn+Cr)=0.74 to 1.26”; and microstructure is specified. | 09-02-2010 |
| 20100322814 | HIGH-STRENGTH STEEL SHEET EXCELLENT IN RESISTANCE TO STRESS-RELIEF ANNEALING AND LOW TEMPERATURE JOINT TOUGHNESS - A high-strength steel sheet is provided which, even when subjected to long-term stress-relief annealing after welding, decreases little in strength and which has satisfactory low-temperature HAZ toughness. The high-strength steel sheet has a chemical composition adequately regulated and has a CP value defined by the following equation (1) of 5.40% or higher and a carbon equivalent (Ceq) defined by the following equation (2) of 0.45% or lower. CP value=125[Ti]+111[Nb]+60[V]+15[Mo] (1) ([Ti], [Nb], [V], and [Mo] indicate the contents (mass %) of Ti, Nb, V, and Mo, respectively.) Ceq=[C]+[Mn]/6+([Cr]+[Mo]+[V])/5+([Cu]+[Ni])/15 (2) ([C], [Mn], [Cr], [Mo], [V], [Cu], and [Ni] indicate the contents (mass %) of C, Mn, Cr, Mo, V, Cu, and Ni, respectively.) | 12-23-2010 |
| 20110020167 | HIGH-STRENGTH THICK STEEL PLATE FOR STORAGE CONTAINER EXCELLENT IN LOW-TEMPERATURE TOUGHNESS OF MULTI-LAYER WELDED JOINT - The high-strength thick steel plate for storage container contains: C: 0.12-0.16% (means mass %, hereinafter the same), Si: 0.05-0.5%, Mn: 1-1.5%, Al: 0.01-0.05%, Nb: 0.003-0.02%, Mo: 0.03-0.3%, V: 0.025-0.04%, Cr: 0.05-0.3%, Cu: 0.05-0.5%, Ni: 0.15-0.55%, Ca: 0.0005-0.006% respectively, and the RP value as defined by an equation (1) below satisfies the relation of RP≧4.5×10 | 01-27-2011 |
| 20110229363 | STEEL FOR MACHINE AND STRUCTURAL USE HAVING EXCELLENT MACHINABILITY - The present invention provides a steel for machine and structural use which sustains mechanical properties such as strength by reducing S content, and exerts excellent machinability (in particular, tool life) in both of intermittent cutting with HSS tools and continuous cutting with carbide tools. The invention relates to a steel for machine and structural use which contains an oxide inclusion containing, wherein a total mass of an average composition of the oxide inclusions is 100%: CaO: 10 to 55 mass %; SiO | 09-22-2011 |
| 20110274578 | STEEL FOR SURFACE HARDENING FOR MACHINE STRUCTURAL USE AND PART FOR MACHINE STRUCTURAL USE - The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300° C. of 650 or more. | 11-10-2011 |
| 20110311391 | STEEL MATERIAL COMPOSITION FOR PRODUCING PISTON RINGS AND CYLINDER SLEEVES - The invention relates to a steel material composition, in particular for producing piston rings and cylinder sleeves, containing the following elements in the given fractions in relation to 100% by weight of the steel material: 0.5-1.2% by weight C, 2.0-20.0% by weight Cr, 49.0-97.1% by weight Fe, 0.1-3.0% by weight Mn, 0.1-3.0% by weight Mo, 0.-7.0% by weight Nb, 2.0-10.0% by weight Si, 0-7.0% by weight Ti, 0.-7.0% by weight V and 0.-0.5% by weight W, the sum of the fractions of Nb, Ti, V and W being 2.0-7.0% by weight. Said composition can be produced by melting the starting materials and casting the melt in a pre-fabricated mould. | 12-22-2011 |
| 20120027637 | STEEL FOR WELDED STRUCTURE AND PRODUCING METHOD THEREOF - A steel for a welded structure includes the following composition: by mass %, C at a C content [C] of 0.010 to 0.065%; Si at a Si content [Si] of 0.05 to 0.20%; Mn at a Mn content [Mn] of 1.52 to 2.70%; Ni at a Ni content [Ni] of 0.10% to 1.50%; Ti at a Ti content [Ti] of 0.005 to 0.015%; 0 at an O content [O] of 0.0010 to 0.0045%; N at a N content [N] of 0.002 to 0.006%; Mg at a Mg content [Mg] of 0.0003 to 0.003%; Ca at a Ca content [Ca] of 0.0003 to 0.003%; and the balance composed of Fe and unavoidable impurities. A steel component parameter P | 02-02-2012 |
| 20120063944 | BEARING COMPONENT - Bearing component ( | 03-15-2012 |
| 20120076685 | HIGH-STRENGTH PEARLITIC STEEL RAIL HAVING EXCELLENT DELAYED FRACTURE PROPERTIES - A steel rail including a composition of, in mass percent, C of 0.6% to 1.0%, Si of 0.1% to 1.5%, Mn of 0.4% to 2.0%, P of 0.035% or less, S of 0.010% or less, Ca of 0.0010% to 0.010%, and the remainder being Fe and inevitable impurities, wherein the tensile strength is 1200 MPa or more, and the size of a long side of a C type inclusion is 50 μm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of Ca type inclusions, each having a size of a long side of 1 μm to 50 μm, is 0.2 to 10 per observed area of 1 mm | 03-29-2012 |
| 20120093678 | STEEL MATERIAL FOR AUTOMOBILE CHASSIS PARTS SUPERIOR IN FATIGUE CHARACTERISTICS AND METHOD OF PRODUCTION OF AUTOMOBILE CHASSIS PARTS USING THE SAME - The present invention provides a steel material for automobile chassis parts, having high fatigue characteristics, without a heat treatment, and superior shapeability, and a method of production of such automobile chassis parts. The surface of the steel has a high hardness and the center has a low hardness, providing the superior characteristics. With an annealing step of the invention, it is possible to relieve internal stress and further improve fatigue characteristics. | 04-19-2012 |
| 20120121453 | HIC-RESISTANT THICK STEEL PLATE AND UOE STEEL PIPE - A thick steel plate and a UOE steel pipe having a high strength of at least X60 grade and improved resistance to HIC have a chemical composition consisting essentially of, in mass percent, C: 0.02-0.07%, Si: 0.05-0.50%, Mn: 1.1-1.6%, P: at most 0.015%, S: at most 0.002%, Nb: 0.005-0.060%, Ti: 0.005-0.030%, Al: 0.005-0.06%, Ca: 0.0005-0.0060%, N: 0.0015-0.007%, at least one of Cu, Ni, Cr, and Mo in a total amount of greater than 0.1% and less than 1.5%, and a remainder of Fe and impurities, wherein the degrees of segregation of Nb and Ti are both at most 2.0, and the ratio of (the degree of Nb segregation)/(the degree of Mn segregation) and the ratio of (the degree of Ti segregation)/(the degree of Mn segregation) are both at least 1.0 and at most 1.5. | 05-17-2012 |
| 20130084205 | STEEL FOR STEEL TUBE WITH EXCELLENT SULFIDE STRESS CRACKING RESISTANCE - The present invention provides a steel which simultaneously satisfies a plurality of characteristics, specifically, a steel for tubes with excellent sulfide stress cracking resistance, including, C: 0.2 to 0.7%; Si: 0.01 to 0.8%; Mn: 0.1 to 1.5%; S: not more than 0.005%; P: not more than 0.03%; Al: 0.0005 to 0.1%; Ti: 0.005 to 0.05%; Ca: 0.0004 to 0.005%; N: not more than 0.007%; Cr: 0. 1 to 1.5%; and Mo: 0.2 to 1.0%; the balance being Fe, Mg and impurities, being characterized in that: the content of Mg is not less than 1.0 ppm and not more than 5.0 ppm; and inclusions of not less than 50% of the total number of those in steel have such a morphology that Mg—Al—O-based oxides exist at the central part of the inclusion, Ca—Al-based oxides enclose the Mg—Al—O-based oxides, and Ti-containing-carbonitrides further exist on a periphery of the Ca—Al-based oxides. | 04-04-2013 |
| 20130224063 | STEEL PLATE FOR PIPELINE, HAVING EXCELLENT HYDROGEN INDUCED CRACK RESISTANCE, AND PREPARATION METHOD THEREOF - Disclosed are a steel plate for a line pipe having excellent hydrogen induced crack resistance with a tensile strength of 450 MPa or more, and a preparation method thereof. According to the present invention, the steel plate for a line pipe, having excellent hydrogen induced crack resistance comprises: 0.03-0.05 wt % of carbon (C); 0.2-0.3 wt % of silicon (Si); 0.5-1.3 wt % of manganese (Mn); 0.010 wt % or less of phosphorus (P); 0.005 wt % or less of sulfur (S); 0.02-0.05 wt % of aluminum (Al); 0.2-0.5 wt % of nickel (Ni); 0.2-0.3 wt % of chromium (Cr); 0.03-0.05 wt % of niobium (Nb); 0.02-0.05 wt % of vanadium (V); 0.01-0.02 wt % of titanium (Ti); 0.001-0.004 wt % of calcium (Ca); and a balance of iron (Fe) and inevitable impurities, and has a tensile strength of 450 MPa or more. | 08-29-2013 |
| 20130236350 | HIGHLY FORMABLE HIGH-STRENGTH STEEL SHEET, WARM WORKING METHOD, AND WARM-WORKED AUTOMOBILE PART - A high-strength steel sheet has a chemical composition including 0.05% to 0.3% of C, 1% to 3% of Si, 0.5% to 3% of Mn, 0% to 0.1% of P, 0.001% to 0.1% of Al, and 0.002% to 0.03% of N, in mass percent; further includes iron and impurities; and has a structure including 50% to 90% of bainitic ferrite, 5% to 20% of retained austenite (γ | 09-12-2013 |
| 20130259734 | HIGHLY FORMABLE HIGH-STRENGTH STEEL SHEET, WARM WORKING METHOD, AND WARM-WORKED AUTOMOBILE PART - A high-strength steel sheet has a chemical composition including 0.05% to 0.3% of C, 1% to 3% of Si, 0.5% to 3% of Mn, 0% to 0.1% of P, 0% to 0.01% of S, 0.001% to 0.1% of Al, and 0.002% to 0.03% of N in mass percent; further includes iron and impurities; and has a structure including 50% to 90% of bainitic ferrite, 3% or more of retained austenite (γ | 10-03-2013 |
| 20130272913 | STEEL WIRE MATERIAL AND METHOD FOR MANUFACTURING SAME - This steel wire material contains 0.05%-1.2% C (“%” means “% by mass,” same hereinafter for chemical components.), 0.01%-0.7% Si, 0.1%-1.5% Mn, 0.02% max. P (not including 0%), 0.02% max. S (not including 0%), and 0.005% max. N (not including 0%), with the remainder being iron and unavoidable impurities. The steel wire material has a scale 6.0-20 μm thick and holes of an equivalent circle diameter of 1 μm max. in said scale that occupy 10% by area max. Said scale does not detach in the cooling process after hot rolling or during storage or transportation but can readily detach during mechanical descaling. | 10-17-2013 |
| 20130272914 | STEEL WIRE MATERIAL AND METHOD FOR MANUFACTURING SAME - The steel wire material of the present invention contains 0.05 to 1.2% of C (mass %; same for the chemical components hereafter), 0.01 to 0.5% of Si, 0.1 to 1.5% of Mn, 0.02% or less (but not 0%) of P, 0.02% or less (but not 0%) of S, and 0.005% or less (but not 0%) of N, with the balance being iron and inevitable impurities. The wire material has a scale layer that is no thicker than 7.0 μm or less. The scale layer has an FeO percentage of 30 to 80 vol % and an Fe | 10-17-2013 |
| 20130302204 | HIGH CARBON STEEL WIRE ROD EXCELLENT IN DRAWABILITY AND FATIGUE CHARACTERISTICS AFTER WIRE DRAWING - High performance high carbon wire with refined inclusions after wire rolling, extremely low wire breakage rates at the time of drawing even in tough applications, and excellent in fatigue characteristics after wire drawing, characterized by having a predetermined composition of ingredients and in that the number ratio of inclusions satisfying (% SiO | 11-14-2013 |
| 20140017112 | BEARING STEEL MATERIAL WITH EXCELLENT ROLLING CONTACT FATIGUE PROPERTIES AND A BEARING PART - Bearing steel material according to the present invention has: a properly adjusted chemical composition; an average chemical composition of oxide-inclusions which comprises 10 to 45% of CaO, 20 to 45% of Al | 01-16-2014 |
| 20140193288 | SPRING STEEL AND SPRING - The present invention provides a spring steel, which is finally formed into a spring, by making use of, at a maximum, the temper softening resistance effect due to alloying elements while suppressing the formation of hard inclusions of SiO | 07-10-2014 |
| 20140205487 | OIL-WELL STEEL PIPE HAVING EXCELLENT SULFIDE STRESS CRACKING RESISTANCE - To provide an oil-well steel pipe having excellent SSC resistance. The oil-well steel pipe according to the present invention contains, by mass percent, C: 0.15 to 0.35%, Si: 0.1 to 0.75%, Mn: 0.1 to 1.0%, Cr: 0.1 to 1.7%, Mo: 0.1 to 1.2%, Ti: 0.01 to 0.05%, Nb: 0.010 to 0.030%, Al: 0.01 to 0.1%, P: at most 0.03%, S: at most 0.01%, N: at most 0.007%, and O: at most 0.01%, the balance being Fe and impurities. The Ti content and the Nb content in a residue obtained by bromine-methanol extraction satisfy equation (1): | 07-24-2014 |
| 20140219858 | HOT-FORGING MICRO-ALLOYED STEEL AND HOT-ROLLED STEEL EXCELLENT IN FRACTURE-SPLITABILITY AND MACHINABILITY, AND COMPONENT MADE OF HOT-FORGED MICROALLOYED STEEL - The invention provides a hot-forging micro-alloyed steel and a hot-rolled steel which achieve excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. | 08-07-2014 |
| 20140271331 | HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT ROOM-TEMPERATURE FORMABILITY AND WARM FORMABILITY, AND WARM FORMING METHOD THEREOF - This high-strength steel plate has a component composition including, by mass %, C: 0.02-0.3%, Si: 1-3%, Mn: 1.8-3%, P: 0.1% or less, S: 0.01% or less, Al: 0.001-0.1%, N: 0.002-0.03%, the rest consisting of iron and impurities. Said steel plate has a microstructure including, in terms of area ratio relative to the entire microstructure, each of the following phases: bainitic ferrite: 50-85%; retained γ; 3% or greater; martensite+the aforementioned retained γ; 10-45%; and ferrite: 5-40%. The C concentration (CγR) in the aforementioned retained austenite is 0.3-1.2 mass %, part or all of the N in the aforementioned component composition is solid solution N, and the amount of said solid solution N is 30-100 ppm. | 09-18-2014 |
| 20140328716 | STEEL FOR WELDING - A steel for welding includes steel components in which P | 11-06-2014 |
| 20140348695 | LOW ALLOY STEEL - A low alloy steel, containing, by mass percent, C: 0.01 to 0.15%, Si: 3% or less, Mn: 3% or less, B: 0.005 to 0.050%, and Al: 0.08% or less, and the balance being Fe and impurities, wherein in the impurities, N: 0.01% or less, P: 0.05% or less, S: 0.03% or less, and O: 0.03% or less. In the alloy steel, a HAZ has excellent resistance to embrittlement attributable to hydrogen such as stress corrosion cracking in wet hydrogen sulfide environments. | 11-27-2014 |
| 20150056093 | MARAGING STEEL EXCELLENT IN FATIGUE CHARACTERISTICS - Provided is a maraging steel excellent in fatigue characteristics, including, in terms of % by mass: C: ≦0.015%, Ni: from 12.0 to 20.0%, Mo: from 3.0 to 6.0%, Co: from 5.0 to 13.0%, Al: from 0.01 to 0.3%, Ti: from 0.2 to 2.0%, O: ≦0.0020%, N: ≦0.0020%, and Zr: from 0.001 to 0.02%, with the balance being Fe and unavoidable impurities. | 02-26-2015 |
| 20150093286 | STAINLESS STEEL ALLOY FOR GOLF CLUB HEAD - A stainless steel alloy adapted for a golf club head includes 0.03 wt % of carbon, 0.01 wt % of phosphorus, 0.1 wt % of silicon, 0.05 wt % of calcium, 0.03 wt % of zirconium, 0.1 wt % of manganese, 0.01 wt % of sulfur, 4 wt % to 5.1 wt % of molybdenum, 18 wt % to 19 wt % of nickel, 7 wt % to 12 wt % of cobalt, 0.05 wt % to 0.15 wt % of aluminum, 0.1 wt % to 0.8 wt % of titanium, and a balance of iron based on 100 wt % of the stainless steel alloy, wherein the content of iron is more than 0 wt %. | 04-02-2015 |
| 20150147223 | BEARING STEEL MATERIAL WITH EXCELLENT ROLLING FATIGUE PROPERTY AND BEARING PART - A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al | 05-28-2015 |
| 20150307974 | STEEL MATERIAL HAVING EXCELLENT ALCOHOL-INDUCED PITTING CORROSION RESISTANCE AND ALCOHOL-INDUCED SCC RESISTANCE - A steel material excellent in alcohol-induced pitting corrosion resistance and alcohol-induced SCC resistance enables application in large structures without the need of alloy treatment or addition of inhibitors, by improving the pitting corrosion resistance and the SCC resistance of the steel material itself, by having a chemical composition containing, by mass % C: 0.03% to 0.3%, Si: 0.01% to 1.0%, Mn: 0.1% to 2.0%, P: 0.03% or less, S: 0.01% or less and Al: 0.1% or less, and one or both of Mo: 0.03% to 1.0% and W: 0.03% to 1.0%, and at least two of Sb: 0.005% to 0.5%, Sn: 0.01% to 0.3% and Nb: 0.005% to 0.1%, and the balance including Fe and incidental impurities. | 10-29-2015 |
| 20150361533 | HYPOEUTECTOID BEARING STEEL - A steel alloy comprising from: (a) 0.6 to 0.9 wt. % carbon, (b) 0.1 to 0.5 wt. % silicon, (c) 0.1 to 1.5 wt. % manganese, (d) 1.5 to 2.0 wt. % chromium, (e) 0.2 to 0.6 wt. % molybdenum, and up to: (f) 0.25 wt. % nickel, (g) 0.3 wt. % copper, (h) 0.2 wt. % vanadium, (i) 0.2 wt. % cobalt, (j) 0.2 wt. % aluminium, (k) 0.1 wt. % niobium, (l) 0.2 wt. % tantalum, (m) 0.05 wt. % phosphorous, (n) 0.03 wt. % sulphur, (o) 0.075 wt. % tin, (p) 0.075 wt. % antimony, (q) 0.075 wt. % arsenic, (r) 0.01 wt. % lead, (s) 350 ppm nitrogen, (t) 100 ppm oxygen, (u) 50 ppm calcium, (v) 50 ppm boron, (w) 50 ppm titanium, the balance iron, including any other unavoidable impurities, wherein the alloy comprises molybdenum and silicon in a weight ratio of 0.4≦Mo/Si≦6.0 and comprises molybdenum and chromium in a weight ratio of 0.1≦Mo/Cr≦0.4. | 12-17-2015 |
| 20160020007 | NON-ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT HIGH-FREQUENCY IRON LOSS PROPERTY - A non-oriented electrical steel sheet has a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.001 mass % and the remainder being Fe and inevitable impurities or a chemical composition including C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Pb: not more than 0.0020 mass % and further one or two of Ca: 0.0005-0.007 mass % and Mg: 0.0002-0.005 mass %, and has a stable and excellent high-frequency iron loss property even when Mn content is high. | 01-21-2016 |
| 20160076125 | NON-ORIENTED ELECTRICAL STEEL SHEET HAVING AN EXCELLENT HIGH-FREQUENCY IRON LOSS PROPERTY - A non-oriented electrical steel sheet has a chemical composition that includes C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% as mass % and the remainder being Fe and inevitable impurities or a chemical composition containing C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% and further one or two of Ca: 0.0005-0.005% and Mg: 0.0002-0.005%, and is stably excellent in the high-frequency iron loss property even if a great amount of Mn is included. | 03-17-2016 |
| 20160201173 | BEARING STEEL MATERIAL WITH EXCELLENT ROLLING FATIGUE PROPERTY AND BEARING PART | 07-14-2016 |
| 420085000 | Processes | 1 |
| 20090047167 | Iron-Nickel Alloy - Disclosed is a creep-resistant low-expansion iron-nickel alloy that is provided with increased mechanical resistance and contains 40 to 43 wt. % of Ni, a maximum of 0.1 wt. % of C, 2.0 to 3.5 wt. % of Ti, 0.1 to 1.5 wt. % of Al, 0.1 to 1.0 wt. % of Nb, 0.005 to 0.8 wt. % of Mn, 0.005 to 0.6 wt. % of Si, a maximum of 0.5 wt. % of Co, the remainder being composed of Fe and production-related impurities. Said alloy has a mean coefficient of thermal expansion <5×10<−6>/K in the temperature range of 20 to 200 DEG C. | 02-19-2009 |
