| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 420120000 | 1.5 percent or more manganese containing, but less than 8 percent | 6 |
| 20080199347 | Method of Producing High-Strength Steel Plates with Excellent Ductility and Plates Thus Produced - Steel sheet, the composition of the steel of which comprises, the contents being expressed by weight: 0.08%≦C≦0.23%, 1%≦Mn≦2%, 1≦Si≦2%, Al≦0.030%, 0.1%≦V≦0.25%, Ti≦0.010%, S≦0.015%, P≦0.1%, 0.004%≦N≦0.012%, and, optionally, one or more elements chosen from: Nb≦0.1%, Mo≦0.5%, Cr≦0.3%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting. | 08-21-2008 |
| 20090214377 | Method for Producing Hot Rolled Strip with a Multiphase Microstructure - For the production of hot strip referred to as TRIP steel (transformation induced plasticity), with a multiphase structure and with outstandingly good deformation properties along with high strengths, from the hot-rolled state, the invention proposes a method which is carried out with a predetermined chemical composition of the steel grade used within the limits 0.12-0.25% C; 0.05-1.8% Si; 1.0-2.0% Mn; the remainder Fe and customary accompanying elements and with a combined rolling and cooling strategy in such a way that a structure comprising 40-70% ferrite, 15-45% bainite and 5-20% residual austenite is obtained, wherein the finish rolling of the hot strip ( | 08-27-2009 |
| 20100092332 | HIGH-STRENGTH COLD ROLLED STEEL SHEET HAVING EXCELLENT FORMABILITY, AND PLATED STEEL SHEET - To provide a high-strength cold rolled steel sheet that has well-balanced tensile strength and elongation as well as well-balanced tensile strength and stretch-flangeability, and a plated steel sheet manufactured by plating the steel sheet. | 04-15-2010 |
| 20110305595 | HYDROGEN FATIGUE RESISTANT FERRITIC STEEL AND MANUFACTURING METHOD THEREOF - A ferritic steel having tensile properties and fatigue properties capable of withstanding use in a hydrogen environment and a method of manufacture thereof are provided. By adding one or more element selected from among vanadium (V), titanium (Ti) and niobium (Nb) so that the steel includes, together with at least ferrite grains in the structure, a carbide or carbides of one or more element selected from among V, Ti and Nb, the reduction of area and the fatigue crack propagation rate of the ferritic steel in a hydrogen environment are improved. The advantages of the invention were confirmed in cases where the ferrite grains are small grains of 1 μm or less in size, and in cases where the ferrite grains are coarse grains from several micrometers to 20 μm in size, and moreover in cases where the ferrite grains are coarse grains from several micrometers to 60 μm in size. | 12-15-2011 |
| 20140086787 | METHOD FOR MANUFACTURING HOT-ROLLED SHEET HAVING FINE-GRAINED FERRITE, AND HOT-ROLLED SHEET - A method for manufacturing a hot-rolled sheet attains grain refinement of the steel sheet whose grain size is extremely fine. In particular, a ferrite grain size of less than average 2 μm is obtained, which is not laminar but has ferrite grains with equiaxed morphology and exhibits high formability in forming. The method comprises the steps of rolling and cooling, wherein the rolling reductions, cooling steps, and temperature are closely regulated. A hot rolled sheet made from the method of manufacturing has a controlled ferrite grain in different regions of sheet thickness. | 03-27-2014 |
| 20150023835 | MARTENSITIC STEELS WITH 1700 TO 2200 MPA TENSILE STRENGTH - Martensitic steel compositions and methods of production thereof are provided. More specifically, a martensitic steel having tensile strengths ranging from 1700 to 2200 MPa are provided. Most specifically, the present invention provides thin gage (thickness of ≦1 mm) ultra high strength steel with an ultimate tensile strength of 1700 to 2200 MPa and methods of production thereof. | 01-22-2015 |
