ASTM A387 grade 9 steel pipe (such as outer diameter or side length) and wall thickness show that its size range is very wide, from capillary with small diameter to large diameter pipe with several meters in diameter. ASTM A387 grade 9 steel pipe can be used for pipeline, thermal equipment, mechanical industry, petroleum geological exploration, container, chemical industry and special purpose.
ASTM A387 grade 9 steel pipe is divided into seamless steel pipe and welded steel pipe. ASTM A387 grade 9 steel pipe can be divided into round pipe and special-shaped pipe according to cross-section shape. Circular pipe is widely used, but there are also some special-shaped steel pipes such as square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal, etc.
For ASTM A387 grade 9 steel pipe under fluid pressure, hydraulic test shall be carried out to check its pressure resistance and quality. It is qualified if there is no leakage, wetting or expansion under the specified pressure. For ASTM A387 grade 9 steel pipe, crimping test, expanding test and flattening test shall be carried out according to the standard or the requirements of the demand.
