What is the high pressure boiler seamless steel pipes?
High pressure boiler seamless steel pipe is a type of boiler pipe and belongs to the seamless steel pipe category. The manufacturing method is the same as that of seamless pipes, but there are strict requirements for the type of steel used in manufacturing steel pipes.
Seamless steel pipes for high-pressure boilers often have to withstand high temperatures and pressures during use. Pipes will be oxidized and corroded under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high resistance to oxidation and corrosion, and good structural stability.
High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers.
The main product introduction:
Low and medium pressure boiler pipes GB3087-1999 and high-pressure boiler seamless pipes GB5310-1999 are used to manufacture superheated steam pipes, boiling water pipes for low- and high-pressure boilers of various structures, and superheated steam pipes, large smoke pipes, small smoke pipes and arches for locomotive boilers. High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for brick pipes. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structures and mechanical structures.
Specifications and appearance quality:
GB5310-95 "Seamless Steel Pipe for High-Pressure Boilers" The outer diameter of hot-rolled pipes is 22 to 530mm, and the wall thickness ranges from 20 to 70mm. The outer diameter of cold drawn (cold rolled) pipe is 10~108mm, and the wall thickness ranges from 2.0~13.0mm.
Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes except round pipes.
According to the different cross-sectional shape and size of the steel pipe, it can be divided into special-shaped seamless steel pipes with equal wall thickness (code-named D), special-shaped seamless steel pipes with unequal wall thickness (code-named BD), and variable-diameter special-shaped seamless steel pipes (code-named BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the weight of the structure and save steel.
The production method
Boiler tube is a kind of seamless tube. The manufacturing method is the same as that of seamless pipes, but there are strict requirements for the type of steel used in manufacturing steel pipes. According to the operating temperature, it is divided into two types: general boiler tubes and high-pressure boiler tubes.
1. Overview
(1) Manufacturing method:
① Generally, the operating temperature of boiler pipes is below 450°C. Domestic pipes are mainly made of No. 10 and No. 20 carbon steel hot-rolled pipes or cold-drawn pipes.
② High-pressure boiler tubes are often exposed to high temperature and high pressure conditions when used. Under the action of high-temperature flue gas and water vapor, the tubes will oxidize and corrode.Steel pipes are required to have high lasting strength, high resistance to oxidation and corrosion, and good structural stability.
(2) Use
①General boiler tubes are mainly used to make water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc.
② High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers.
