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    • 88. 发明授权
    • Hot bend pipe and a process for its manufacture
    • 热弯管及其制造工艺
    • US07770428B2
    • 2010-08-10
    • US12318882
    • 2009-01-12
    • Nobuaki TakahashiAkio YamamotoMasahiko Hamada
    • Nobuaki TakahashiAkio YamamotoMasahiko Hamada
    • B21D9/00
    • B21C37/08B23K33/006B23K2101/06B23K2103/04C21D9/08C21D9/50C22C38/02C22C38/04C22C38/06
    • A high-strength hot bend pipe which has a balance between an excellent strength of at least X70 grade and toughness and which has excellent tensile properties and a weld metal with excellent low temperature toughness is manufactured. A UOE steel pipe having a base metal with a composition of C: 0.03-0.12%, Si: 0.05-0.50%, Mn: 1.4-2.2%, S: at most 0.01%, Al: at most 0.06%, N: at most 0.008%, and a remainder of Fe and impurities, with the carbon equivalent (Ceq) being at most 0.36% and the weld cracking parameter (Pcm) being at most 0.22%, and having a weld metal with a weld cracking parameter (Pcm) of at most 0.28%, a B content of at most 5 ppm, and an O content of at most 280 ppm is heated to a temperature range of 900-1100° C. and subjected to bending, and then is immediately cooled to a temperature range of 300° C. or lower at a cooling rate of at least 3° C./sec, and then is tempered in a temperature range of 300-500° C.
    • 制造具有至少X70等级的优异强度和具有优异的拉伸性能的优异强度与具有优异的低温韧性的焊接金属之间的平衡的高强度热弯管。 具有组成为C:0.03〜0.12%,Si:0.05〜0.50%,Mn:1.4〜2.2%,S:0.01%以下,Al:0.06%以下的贱金属的UOE钢管,N: 最多0.008%,余量为Fe和杂质,碳当量(Ceq)最大为0.36%,焊接裂纹参数(Pcm)为0.22%以下,具有焊缝裂纹参数(Pcm )为0.28%以下,B含量为5ppm以下,O含量为280ppm以下,加热到900〜1100℃的温度范围,进行弯曲,然后立即冷却至 温度范围为300℃以下,冷却速度为3℃/秒以上,然后在300-500℃的温度范围内回火。