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1. 发明授权

US4523072A Production of electrical resistance welded steel tubes with welds having improved toughness 失效
标题翻译：生产具有改善韧性的焊缝的电阻焊钢管
公开(公告)号：US4523072A
公开(公告)日：1985-06-11
申请号：US528782
申请日：1983-09-02
申请人： Hiroshi Nakate , Masatoshi Kondo , Nobuyuki Gosho
发明人： Hiroshi Nakate , Masatoshi Kondo , Nobuyuki Gosho
IPC分类号： B23K13/02 , B23K11/08
CPC分类号： B23K13/02
摘要： A process for producing an ERW tube having welds which have been improved in toughness without adversely affecting the toughness of the parent metal of the tube is disclosed. The process comprises forming a continuous low alloy steel strip into a tubular shape through a series of forming rolls, continuously carrying out electrical resistance welding of a seam which is formed from the opposite side edges of the hoop and which extends in the longitudinal direction to produce an electrical resistance welded tube, heating the welds of the thus obtained electrical seam welded tube to a temperature not lower than the A.sub.c3 point, then cooling the heated welds at cooling rate of 15.degree.-30.degree. C./sec for at least between 800.degree. C. and the A.sub.r1 point, and tempering the thus cooled welds of the tube at a temperature of 450.degree.-800.degree. C.
摘要翻译：公开了一种具有已经提高韧性而不会不利地影响管的母体金属韧性的焊缝的ERW管的制造方法。该方法包括通过一系列成形辊将连续的低合金钢带形成为管状，连续地进行由箍的相对侧边缘形成并沿纵向方向延伸的接缝的电阻焊接一个电阻焊管，将这样得到的电缝焊管的焊缝加热至不低于Ac3点的温度，然后以15°-30℃/秒的冷却速率冷却加热焊缝至少800 ℃和Ar1点，并在450-800℃的温度下回火管冷却的焊缝。

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