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    • 5. 发明申请
    • Heat treatment method and device for piping
    • 管道热处理方法及装置
    • US20060113010A1
    • 2006-06-01
    • US11290468
    • 2005-12-01
    • Noboru SaitouNobuyoshi YanagidaShoji HayashiSatoshi KannoKunio Enomoto
    • Noboru SaitouNobuyoshi YanagidaShoji HayashiSatoshi KannoKunio Enomoto
    • C21D9/08
    • C21D9/50C21D1/42C21D9/08Y02P10/253
    • In a method for heat treatment of an existing pipe constituting a piping system, for converting the residual stress at a welded metallic portion and a welding heat influenced portion of the inside surface of the pipe, into a compressive stress and thereby generate the compressive stress in the inside surface of the existing pipe, a coolant is retained in the pipe; an arbitrary portion of the outside surface of the pipe is heated; thereby a temperature distribution little in temperature difference is produced in the wall surface of the pipe at the heated portion; and then the coolant is allowed to flow. By converting the residual stress at the welded metallic portion and the welding heat influenced portion of the inside surface of the pipe, into the compressive stress, stress corrosion cracking generated from the welded metallic portion and the welding heat influenced portion can be suppressed.
    • 在构成管道系统的现有管道的热处理方法中,用于将焊接金属部分的残余应力和管内表面的焊接热影响部分变形为压缩应力,从而产生压缩应力 现有管道的内表面,冷却剂被保留在管道中; 管道的外表面的任意部分被加热; 从而在加热部分的管的壁表面产生温差很小的温差; 然后允许冷却剂流动。 通过将焊接金属部分的残余应力和管内表面的焊接热影响部分转化为压缩应力,可以抑制从焊接金属部分和焊接热影响部分产生的应力腐蚀裂纹。