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钢管按横断面形状可分为:圆钢管和异形钢管。
According to the cross-section shape, steel pipes can be divided into round steel pipes and special-shaped steel pipes.
异形钢管是指各种非圆环形断面的钢管。其中主要有:方形管、矩形管、椭圆管、平椭管、半圆管、六角形管、六角内圆管、不等边六角形管、等边三角形管、五角梅花管、八角形管，凸字形管、双凸形管。双凹形管、多凹形管、瓜子形管、扁形管、菱形管、星形管、平行四边形管、带肋管、滴状管、内翅片管、扭异管、B型管、D型管以及多层管等。
Special shaped steel pipe refers to all kinds of steel pipes with non-circular circular cross-section. Among them, there are: square tube, rectangular tube, elliptical tube, flat elliptical tube, semicircle tube, hexagon tube, hexagon inner circle tube, unequal hexagon tube, equilateral triangle tube, pentagonal plum tube, octagonal tube, convex tube, double convex tube. Double concave tube, multiple concave tube, melon seed tube, flat tube, rhombus tube, star tube, parallelogram tube, ribbed tube, drop tube, inner fin tube, twisted tube, B-TUBE, d-tube and multilayer tube, etc.
钢管按纵断面形状又分为:等断面钢管和变断面钢管。变断面(或变截面)钢管是指沿管长方向上的断面形状、内外直径及壁厚等发生周期性或非周期性变化的钢管。其主要有:外锥形管、内锥形管、外阶梯管、内阶梯管、周期断面管、波纹管、螺旋管、带散热片的钢管以及带复线的枪管等。
According to the shape of vertical section, steel pipes are divided into equal section steel pipes and variable section steel pipes. Variable cross-section (or variable cross-section) steel pipe refers to the steel pipe with periodic or non periodic changes in cross-section shape, internal and external diameter and wall thickness along the pipe. It mainly includes: outer tapered pipe, inner tapered pipe, outer stepped pipe, inner stepped pipe, periodic section pipe, corrugated pipe, spiral pipe, steel pipe with heat sink and gun pipe with double line, etc.