Surface pipes used for heating medium and low pressure boilers (working pressure generally does not exceed 5.88Mpa, working temperature is below 450℃); Used for heating surface pipelines, economizer, superheater, reheater, petrochemical industrial pipelines, etc. High pressure boiler (working pressure is generally above 9.8Mpa and working temperature is between 450℃ and 650℃).

Specification and appearance quality

(1)GB3087-2008 Seamless steel pipe for low and medium pressure boilers. Specification of steel pipes for boilers with various structures, with outer diameter 10 ~ 426 mm, 43 kinds of * * *. There are 29 kinds of wall thickness 1.5 ~ 26 mm * * *. However, the outer diameter and wall thickness of superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe of locomotive boiler are otherwise stipulated.

(2)GB53 10-2008 Seamless Steel Pipe for External Heat Pipe of High Pressure Boiler

High pressure boiler tube

The diameter is 22 ~ 530mm, the wall thickness is 20 ~ 70mm, the outer diameter of cold-drawn (cold-rolled) pipe is10 ~108mm, and the wall thickness is 2.0 ~13.0mm. ..

(3)GB3087-82 Seamless Steel Pipe for Medium and Low Pressure Boilers and GB53 10-95 Seamless Steel Pipe for High Pressure Boilers. Appearance quality: cracks, folding, rolling, scarring, delamination and hair are not allowed on the inner and outer surfaces of steel pipes. These defects should be completely eliminated. The removal depth shall not exceed the negative deviation of the nominal wall thickness, and the actual wall thickness at the removal place shall not be less than the minimum allowable wall thickness.