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Specification and appearance quality of steam boiler pipe

(1) Gb3087-82 seamless steel tubes for low and medium pressure steam boilers. There are 43 types of steel pipes for steam boiler, with an outer diameter of 10 ~ 426mm. The wall thickness is 1.5 ~ 26mm, with a total of 29 species. However, the outer diameter and wall thickness of superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe for locomotive steam boiler are still defined.


(2) Gb5310-95 seamless steel tubes for high pressure steam boilers hot rolled tubes have an outer diameter of 22 ~ 530mm and a wall thickness of 20 ~ 70mm. Cold drawn (cold rolled) pipe has an outer diameter of 10 ~ 108mm and a wall thickness of 2.0 ~ 13.0mm.


(3) Gb3087-82 seamless steel tubes for low and medium pressure steam boilers and gb5310-95 seamless steel tubes for high pressure steam boilers. Appearance quality: cracks, folds, rolling folds, scabs, delamination and hair lines are not allowed on the surface and inside of the steel pipe. These shortcomings should be thoroughly eliminated. The cleaning depth shall not exceed the negative error of the nominal wall thickness, and the actual wall thickness at the clearing place shall not be less than the very small value allowed by the wall thickness.