The invention relates to a manufacturing process of a high-pressure boiler
pipe. The manufacturing process comprises two aspects of
smelting a stainless steel blank and manufacturing a steel
pipe. When a stainless steel blank is smelted, the carbon content in the corresponding steel grade is increased, and the contents of Ti and Nb in the steel grade containing Ti and Nb are strictly controlled. In the steel
pipe manufacturing process, the respective hot tapping temperature of different steel types is controlled; the cold deformation is controlled to be 55% or below; and carrying out heat treatment at a proper
softening temperature of the product and a proper
solid solution temperature of the finished product. The high-pressure boiler steel pipe manufactured according to the manufacturing process provided by the invention has the advantages of high
creep rupture strength, high high-temperature steam
corrosion resistance, sufficient
toughness,
machinability and
weldability. And the requirements of higher and higher boiler
steam pressure and temperature parameters on the steel pipe can be met. The problem that an existing high-pressure boiler pipe is tedious and inconvenient to manufacture is solved, the
manufacturing quality of the steel pipe is improved, and the high-pressure boiler pipe has the advantages of being simple in manufacturing process, few in used equipment and low in cost and is quite convenient to popularize and use on a large scale.