The steel products of steel pipe are of various kinds and specifications, and their performance requirements are various. All of these should be distinguished by changes in user requirements or working conditions. In general, the steel pipe products are classified according to section shape, production method, pipe material, connection mode, coating characteristics and use.
The steel pipe can be divided into round steel pipe and special-shaped steel tube according to the cross sectional shape.
Special-shaped steel pipe refers to all kinds of non-circular round section steel pipe. Including: square tube, rectangular tube, oval tube, flat elliptical tube, tube, pipe, six angle hexagonal tubes, equilateral hexagonal tube, equilateral triangle tubes, five angle octagonal plum tube, pipe, tube, double tube shaped convex shape. Biconcave tube, concave tube, oval shaped tube, flat tube, pipe, tube, diamond shaped parallelogram ribbed tube, pipe, tube, droplet inner fin tube, twisted tube, ISO B pipe, D pipe and multilayer pipe etc..
The steel pipe is divided into equal section steel pipe and variable cross section steel pipe according to the vertical section shape. Variable cross-section (or variable cross section) steel pipe refers to the steel pipe along the tube rectangular shape, internal and external diameter and wall thickness, cyclical or non periodic changes in the steel pipe. The utility model mainly comprises an outer conical tube, an inner conical tube, an outer ladder pipe, an inner ladder pipe, a periodic section tube, a corrugated pipe, a spiral tube, a steel tube with a radiating fin, and a gun barrel with double tracks, etc..