here are many steel grades and specifications of steel pipe products, and their performance requirements are also various. All these should be distinguished according to user requirements or changes in working conditions. Generally, steel pipe products are classified according to cross-sectional shape, production method, pipe material, connection method, plating characteristics and use.
Steel pipes can be divided into round steel pipes and special-shaped steel pipes according to their cross-sectional shape.
Special-shaped steel pipes refer to steel pipes with various non-circular cross-sections. Among them are: square tube, rectangular tube, oval tube, flat oval tube, semicircular tube, hexagonal tube, hexagonal inner round tube, unequal hexagonal tube, equilateral triangle tube, pentagonal plum tube, octagonal tube, convex Glyph tube, double convex tube. Double-concave tube, multi-concave tube, melon seed tube, flat tube, rhombus tube, star tube, parallelogram tube, ribbed tube, drop tube, inner fin tube, twisted tube, B-shaped tube, D Type tube and multilayer tube, etc.
Steel pipes are divided into equal-section steel pipes and variable-section steel pipes according to the shape of the longitudinal section. Variable section (or variable section) steel pipe refers to a steel pipe whose cross-sectional shape, inner and outer diameter and wall thickness along the length of the pipe change periodically or non-periodically. It mainly includes: outer tapered tube, inner tapered tube, outer stepped tube, inner stepped tube, periodic section tube, corrugated tube, spiral tube, steel pipe with fins, and gun barrel with double wire.
