Manufacturing process of high-pressure boiler tube

Abstract

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.

Description

technical field [0001] The invention belongs to the field of steel pipe manufacturing, and in particular relates to a manufacturing process of a high-pressure boiler steel pipe. Background technique [0002] According to the national plan, thermal power construction will mainly develop high-efficiency, low-pollution supercritical and ultra-supercritical units. However, the main key technology for the construction of the above-mentioned units is the new steel pipe for high-pressure boilers that must be used after the parameters such as boiler steam pressure and temperature are increased. As the steam pressure and steam temperature increase, the thermal efficiency of the power plant increases and the coal consumption for power supply decreases, so more high-pressure boiler tubes that can withstand the steam pressure and steam temperature are required. Stainless steel pipes for high-pressure boilers and heat exchangers require high high-temperature creep rupture strength and h...

AI Technical Summary

Problems solved by technology

However, the current manufacturing process of high-pressure boiler tubes and steel pipes is complex and inefficient, and it is urgent to study a new manufacturing process