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1.前言内螺纹钢管的螺纹形状与梯形螺纹基本相似,只是螺纹深度(即齿高)比梯形螺纹小得多(≥0.5mm),螺纹头数为4～6头。内螺纹管有两种,一种外壁带鳍片,另一种外壁不带鳍片(即圆形外壁)。内螺纹管主要用于大型电站锅炉设备制造。用内螺纹管制造的锅炉具有热效率高、能耗低的功效。据资料介绍,在国外,内螺纹管已广泛用于锅炉制造业。由于内螺纹管的生产技术难度较大,工艺复杂,质量要求
1. Introduction The thread shape of the internally threaded pipe is basically similar to that of the trapezoidal thread, except that the thread depth (ie tooth height) is much smaller than the trapezoidal thread (≥0.5 mm) and the thread number is 4 to 6. There are two types of internally threaded tubes, one with fins on the outer wall and the other without fins (ie, a circular outer wall). The female pipe is mainly used for large-scale power station boiler equipment manufacturing. Boiler tubes made of internally threaded tubes have the advantages of high thermal efficiency and low energy consumption. According to information, in foreign countries, the internal thread pipe has been widely used in boiler manufacturing. Due to the technical difficulty of the production of the female pipe, the process is complicated and the quality is required