Welded joint made of an austenitic steel
一种焊接接头、奥氏体的技术，应用在焊接/焊接/切割物品、焊接介质、焊接设备等方向
Inactive Publication Date: 2006-08-09
NIPPON STEEL CORP
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Problems solved by technology
[0009] Here, it is necessary to consider both the base material and the weld metal in the design of the materials used for the equipment and equipment including the welded joint. point solution is explored
Method used
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Embodiment
[0091] The base metals coded M1~M4 with the chemical composition shown in Table 1 were dissolved in a 50kg vacuum high-frequency furnace, then formed into a 25mm thick plate by forging, and kept at 1000°C for 1 hour for water cooling and heat treatment to form a welding base material. test material.
[0092] In addition, the alloys W1-W5 and Y1-Y5 with the same chemical composition shown in Table 1 were dissolved in a 50kg vacuum high-frequency furnace and then processed into wire rods with an outer diameter of 2mm as welding materials.
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A weld joint having a base material and a weld metal both of an austenitic steel, wherein the weld metal has a chemical composition, in mass %, that C: 0.04% or less, Si: 1.0% or less, Mn: 3% or less, P: 0.02% or less, S: 0.005% or less, Cr: 15 to 25%, Ni: 30% or more, Mo: 10% or less, Nb: 2.5 to 5%, Al: 3.0% or less, Ti: 0.5% or less, and the balance: Fe and inevitable impurities, the contents of Al and Ti satisfying the following: (Ti+Al)>Nb / 8. The weld joint is a high strength austenitic steel weld joint which exhibits excellent toughness at a low temperature and excellent resistance to hydrogen embrittlement, which are required for a piping and a vessel for high pressure hydrogen, particularly also in a welded zone.
Description
technical field [0001] The present invention relates to a member of austenitic steel, which is used in a hydrogen atmosphere and has excellent weldability, low-temperature toughness, and resistance to hydrogen-catalyzed embrittlement, such as properties required for piping for high-pressure hydrogen, And high strength. More specifically, the present invention relates to an austenitic steel welded joint having low-temperature toughness, hydrogen embrittlement resistance, and weld metal excellent in strength. Background technique [0002] Today, expectations for the practical use of fuel cell vehicles are increasing, and the application is not limited to fuel cell vehicles. From the perspective of preparation for the use environment, it is used for high-pressure hydrogen storage containers, piping, etc. installed in hydrogen supply stations, etc. The development of materials such as valves is also being actively carried out. Such a high-pressure environment is said to be 50 ...
Claims
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IPC IPC(8): B23K35/30C22C38/00C22C38/58B23K9/173B23K35/02
CPCB23K2203/04B23K35/0261C22C38/44B23K2201/12B23K2201/10B23K35/3066B23K35/3033B23K9/173C22C38/50C22C38/48C22C38/02B23K2201/06C22C38/58C22C38/001B23K2101/06B23K2101/10B23K2101/12B23K2103/05Y10T428/12972Y10T428/12292Y10T428/12951Y10T428/12958Y10T428/12965
Inventor 小川和博五十岚正晃仙波润之大村朋彦宫原光雄
Owner NIPPON STEEL CORP
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