Spiral steel pipe has excellent performance under high temperature conditions and can meet the requirements of super (super) critical boilers required to maintain high mechanical strength under high parameters. At the same temperature and pressure, spiral steel pipe and supercritical conditions used in the comparison of alloy materials, wall thickness is significantly reduced, the heating area of stainless steel tubes used with its improved performance and the amount of reduced. Wall thickness for spiral steel pipe and several steels used as heat receiving tubes. Assuming that the cost of manufacturing the same boiler is constant, TP347H stainless steel tube as the base equivalent, calculate the weight ratio of other materials, the cost ratio is inversely proportional to the weight ratio.
 
Analysis of the economic analysis of spiral steel pipe
 
        Spiral steel pipe under the cost ratio of 126%, its weight ratio is equivalent to 79%, the wall thickness of the pipe is only equivalent to 74%. The above shows that the cost performance of spiral steel pipe is superior to other steel and can be used in large quantities. The use of spiral steel pipe is not only economically advantageous, but also, due to the reduction in pipe wall thickness reduces the total weight of the pressure-bearing parts, reducing the structural load-bearing and stress, thermal stress, etc., also reduces the manufacturing costs (welding, heat treatment and process difficulties, etc.) and the difficulty of construction (lifting weight reduction, reduced amount of machinery, etc.). Therefore, even if the cost ratio is higher than the calculated value in Table 1.1, it will bring economic benefits to the manufacturer.