THEORETIC CALCULATION OF CROSS-SECTIONAL AREA OF INTERNAL-THREAD SHAPED STEEL TUBE

The method for theoretic calculation of the cross-sectional area of the internalthread shaped tube on the basis of the tube’s longitudinal-section non-oclar parameters can significantly simplify the operation procedures of sampling, machining of reference specimen and weighing, etc., while the calculation result is close to that of the reference specimen-weighing method. The said method is very practical.