NIPPON STEEL AND SUMITOMO METAL CORPORATION Patent applications |
Patent application number | Title | Published |
20140087320 | METHOD OF REHEATING RAIL WELD ZONE - A method of reheating a rail weld zone after rails were welded, a distance C between a reheating region P of a rail web portion | 03-27-2014 |
20130186529 | STEEL PART FOR MACHINE STRUCTURAL USE AND MANUFACTURING METHOD THEREOF - The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.20 to 0.25%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more. | 07-25-2013 |
20130167986 | STEEL PART FOR MACHINE STRUCTURAL USE AND MANUFACTURING METHOD THEREOF - The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.25 to 0.50%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more. | 07-04-2013 |
20130160647 | METHOD AND DEVICE FOR REMOVING METAL FUMES INSIDE SNOUT IN CONTINUOUS HOT-DIP PLATING PLANT - [Object] There are provided a method for removing metal fumes inside a snout and a device for removing metal fumes inside a snout in a continuous hot-dip plating plant, which are capable of reliably removing metal fumes causing unplating from the snout without heating an outer wall of the snout. | 06-27-2013 |