| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 420042000 | Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability | 16 |
| 20090246065 | ALLOY, SHAFT MADE THEREFROM, AND MOTOR WITH SHAFT - A nonmagnetic austenitic stainless steel consists of, all by weight %, 1.5 to 3.5% of Cu, 8.5 to 9.5% of Mn, 0.18 to 0.22% of C, 0.5 to 1.0% of Si, 16.5 to 17.5% of Cr, 0.15 to 0.2% of N, 0.13 to 0.3% of S, and the balance of Fe and inevitable impurities. | 10-01-2009 |
| 20090252640 | STEEL ALLOY, A HOLDER OR A HOLDER DETAIL FOR A PLASTIC MOULDING TOOL, A TOUGH HARDENED BLANK FOR A HOLDER OR HOLDER DETAIL, A PROCESS FOR PRODUCING A STEEL ALLOY - A steel alloy is described that, in weight-%, includes 0.08-0.19 C, where 0.16≦C+N≦0.28, 0.1-1.5 Si, 0.1-2.0 Mn, 13.0-15.4 Cr, 0.01-1.8 Ni, 0.01-1.3 Mo, max. 0.7 V, max. 0.25 S, max. 0.01 Ca, max. 0.01 O, in order to improve the machinability of the steel, and balance iron and unavoidable impurities, wherein the steel alloy has a microstructure which, in a tough hardened condition, comprises a martensitic matrix with up to 30 vol-% ferrite. | 10-08-2009 |
| 20090263270 | Corrosion-Resistant, Free-Machining, Magnetic Stainless Steel - A corrosion-resistant, free-machining, magnetic stainless steel alloy is described. The alloy has the following weight percent composition: 0.025 max. C, 0.60 max. Mn, 1.0-2.0 Si, 0.035 max. P, 0.15-0.40 S, 12.0-14.0 Cr, 0.5 max. Ni, 0.5-1.3 Mo, 0.5-1.3 V, 0.5 max. Cu, 0.020 max. Al, 0.025 max. N, and the balance is iron and usual impurities. | 10-22-2009 |
| 20100158744 | High strength electrical steel sheet and method of production of same - The present invention has as its object the production of high strength electrical steel sheet, having a high strength of a tensile strength TS of for example 500 MPa or more, having wear resistance, and having superior magnetic properties of magnetic flux density and iron loss, that is, provides a method of production of high strength electrical steel sheet containing, by mass %, C: 0.060% or less, Si: 0.2 to 6.5%, Mn: 0.05 to 3.0%, P: 0.30% or less, S or Se: 0.040% or less, Al: 2.50% or less, N: 0.020% or less, and further one or more of Cu: 0.001 to 30.0% and Nb: 0.03 to 8.0% and having worked structures remaining inside the steel sheet, said method of production of high strength electrical steel sheet coarsening an average crystal grain size D (μm) of a sheet right before a step of forming the worked structures to finally remain inside the steel sheet to D≧20 μm, imparting strain in the final working step as a preferred process, then not performing any heat treatment causing the worked structures to disappear and high strength electrical steel sheet obtained by that method. | 06-24-2010 |
| 20110182764 | Heat-resistant steel for engine valve excellent high-temperature strength - To provide an inexpensive heat-resisting steel for engine valves by causing Fe-based heat-resisting steel to exhibit high temperature strength not inferior to that of Ni-based heat-resisting steel. A heat-resisting steel for engine valves excellent in high temperature strength containing, in % by mass, C: 0.20 to 0.50%, Si: 1.0% or less, Mn: 5.0% or less, P: 0.1 to 0.5%, Ni: 8.0 to 15.0%, Cr: 16.0 to 25.0%, Mo: 2.0% or less (including 0%), Cu: 0.5% or less, Nb: 1.0% or less (including 0%), W: 2.0% or less (including 0%), N: 0.02 to 0.30%, B: 0.01% or less, and remnants of Fe and impurities, wherein the heat-resisting steel for engine valves satisfies formulae below: | 07-28-2011 |
| 20110293464 | Stainless Steel, Cold Strip Produced from this Steel, and Method for Producing a Flat Steel Product from this Steel - A stainless steel and a flat cold product produced therefrom, which can be easily produced in an economical manner. A steel according to the invention, in the cold-rolled state, has a microstructure with 5-15% by volume δ-ferrite and austenite as the remainder. It contains (in % by weight): | 12-01-2011 |
| 20120107169 | HEAT-RESISTING STEEL FOR ENGINE VALVES EXCELLENT IN HIGH TEMPERATURE STRENGTH - To provide an inexpensive heat-resisting steel for engine valves by causing Fe-based heat-resisting steel to exhibit high temperature strength not inferior to that of Ni-based heat-resisting steel. A heat-resisting steel for engine valves excellent in high temperature strength containing, in % by mass, C: 0.20 to 0.50%, Si: 1.0% or less, Mn: 5.0% or less, P: 0.1 to 0.5%, Ni: 8.0 to 15.0%, Cr: 16.0 to 25.0%, Mo: 2.0 to 5.0%, Cu: 0.5% or less, Nb: 1.0% or less (including 0%), W: 8.0% or less (including 0%), N: 0.02 to 0.2%, B: 0.01% or less, and remnants of Fe and impurities, | 05-03-2012 |
| 20120315181 | STAINLESS MOLD STEEL WITH LOWER DELTA FERRITE CONTENT - STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT comprising a composition of alloying elements consisting essentially of, in percentage by mass, Carbon between 0.01 and 0.20; Nitrogen between 0.01 and 0.07; Manganese between 2.0 and 4.0; Nickel between 0.01 and 1.0; Chromium between 11.0 and 13.0; Molybdenum+Tungsten lower than 1.0; Copper between 0.01 and 1.5; Vanadium between 0.01 and 1.0; Sulfur between 0.01 and 0.20; Calcium at maximum 0.01; Aluminum lower than 0.05; Silicon lower than 1.0; the remainder consisting essentially of Fe and inevitable impurities to the preparation process. | 12-13-2012 |
| 20120321501 | High-Carbon Martensitic Stainless Steel and Production Method Therefor - The present invention relates to a production method for high-carbon martensitic stainless steel as used in razorblades, knives and the like, which contains, as percentages by weight, 0.40 to 0.80% carbon and 11 to 16% chromium as main components. Provided is a production method for high-carbon martensitic stainless steel in a strip-casting device, wherein a stainless-steel thin sheet is cast by supplying a stainless molten steel containing, as percentages by weight, 0.40 to 0.80% carbon and from 11 to 16% chromium to a molten steel pool from a tundish via a nozzle, and the cast stainless-steel thin sheet is made into a hot-rolled annealed strip using in-line rollers to a rolling reduction of 5 to 40% immediately just after the casting so that the size of primary carbides within the microstructure of the hot-rolled annealed strip is 10 μm or less, and also provided is martensitic stainless steel produced by means of the production method. By reducing the size of the primary carbides formed in the cast structure and the hot-rolled sheet to 10 μm or less, the present invention produces high-carbon martensitic stainless steel having outstanding blade-end quality for use in cutting implements. | 12-20-2012 |
| 20130022488 | AUSTENITIC HEAT-RESISTANT CAST STEEL - An iron (Fe)-based austenitic heat-resistant cast steel includes, based on a total of 100 mass % (indicated below simply as “%”): 0.4 to 0.8% of carbon (C), 3.0% or less of silicon (Si), 0.5 to 2.0% of manganese (Mn), 0.05% or less of phosphorus (P), 0.03 to 0.2% of sulfur (S), 18 to 23% of chromium (Cr), 3.0 to 8.0% of nickel (Ni) and 0.05 to 0.4% of nitrogen (N). A ratio of chromium (Cr) to carbon (C) is in a range of 22.5≦Cr/C≦57.5. The cast steel includes one or two or more of vanadium (V), molybdenum (Mo), tungsten (W) and niobium (Nb) in a total amount of less than 0.2%. | 01-24-2013 |
| 20130195713 | HEAT-RESISTANT, FERRITIC CAST STEEL HAVING EXCELLENT MELT FLOWABILITY, GAS DEFECT RESISTANCE, TOUGHNESS AND MACHINABILITY, AND EXHAUST MEMBER MADE THEREOF - A heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, which has a composition comprising by mass, C: 0.32-0.45%, Si: 0.85% or less, Mn: 0.15-2%, Ni: 1.5% or less, Cr: 16-23%, Nb: 3.2-4.5%, Nb/C: 9-11.5, N: 0.15% or less, S: (Nb/20-0.1) to 0.2%, W and/or Mo: 3.2% or less in total (W+Mo), the balance being Fe and inevitable impurities, and a structure in which the area ratio of a eutectic (δ+NbC) phase of δ ferrite and Nb carbide (NbC) is 60-80%, and the area ratio of manganese chromium sulfide (MnCr)S is 0.2-1.2%, and an exhaust member made thereof. | 08-01-2013 |
| 20140023550 | FERRITIC STAINLESS STEEL SHEET EXCELLENT IN HEAT RESISTANCE AND WORKABILITY AND METHOD OF PRODUCTION OF SAME - The present invention provides ferritic stainless steel sheet which is excellent in heat resistance at 950° C. and workability at ordinary temperature, that is, ferritic stainless steel sheet excellent in heat resistance and workability which is characterized by containing, by mass %, C: 0.02% or less, N: 0.02% or less, Si: over 0.1 to 1.0%, Mn: 0.5% or less, P: 0.020 to 0.10%, Cr: 13.0 to 20.0%, Nb: 0.5 to 1.0%, Cu: 1.0 to 3.0%, Mo: 1.5 to 3.5%, W: 2.0% or less, B: 0.0001 to 0.0010%, and Al: 0.01 to 1.0% and having a balance of Fe and unavoidable impurities, where Mo+W is made 2.0 to 3.5%. | 01-23-2014 |
| 20140065005 | Ferritic Stainless Steel with Excellent Oxidation Resistance, Good High Temperature Strength, and Good Formability - Ferritic stainless steels with good oxidation resistance, and good high temperature strength and good formability are produced with Ti addition and low Al content for room temperature formability resulting from equiaxed as-cast grain structures. Columbium (niobium) and copper are added for high temperature strength. Silicon and manganese are added for oxidation resistance. The ferritic stainless steels provide better oxidation resistance than ferritic stainless steels of 18Cr-2Mo and 15Cr—Cb—Ti—Si—Mn. In addition, they are generally less costly to produce than 18Cr-2Mo. | 03-06-2014 |
| 20140065006 | Ferritic Stainless Steel with Excellent Oxidation Resistance, Good High Temperature Strength, and Good Formability - Ferritic stainless steels with good oxidation resistance, good high temperature strength, and good formability are produced with Ti addition and low Al content for room temperature formability resulting from equiaxed as-cast grain structures. Columbium (niobium) and copper are added for high temperature strength. Silicon and manganese are added for oxidation resistance. The ferritic stainless steels provide better oxidation resistance than ferritic stainless steels of 18Cr—2Mo and 15Cr-Cb-Ti—Si—Mn. In addition, they are generally less costly to produce than 18Cr—2Mo. | 03-06-2014 |
| 20150086411 | HEAT-RESISTANT BEARING MATERIAL MADE OF AN AUSTENITIC IRON MATRIX ALLOY - A heat-resistant bearing material may include an austenitic iron matrix alloy having a proportion of sulphur sufficient to achieve a solid lubricating action on bearing surfaces of the heat-resistant bearing material. The iron matrix alloy may have a proportion of carbides to achieve a reduction of wear on bearing surfaces of the heat-resistant bearing material and a proportion of 1 to 6 percentage by weight of at least one alloying element including cobalt, niobium, rhenium, tantalum, vanadium, tungsten, hafnium, yttrium and zirconium. The iron matrix alloy may also include the following alloying elements: carbon, chromium, manganese, silicon, nickel, molybdenum, niobium, tungsten, sulphur, copper, nitrogen and iron. | 03-26-2015 |
| 20150086412 | HEAT-RESISTANT, AUSTENITIC CAST STEEL HAVING EXCELLENT MACHINABILITY AND EXHAUST MEMBER MADE THEREOF - A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn−10×C−2×Nb−0.25×Cr−0.15×Ni−1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of −3.0≦I≦+14.0, and an exhaust member made thereof. | 03-26-2015 |
