Steel pipes with non-standard shapes include: elliptical steel pipes, triangular steel pipes, hexagonal steel pipes, diamond-shaped steel pipes, octagonal steel pipes, semi-circular steel pipes, uneven hexagonal steel pipes, five-petal plum blossom-shaped steel pipes, double convex steel pipes, double concave steel pipes, melon-shaped steel pipes, conical steel pipes, and corrugated steel pipes.

Alloy tube sections include: rectangular alloy tubes, square alloy tubes, rectangular alloy tubes, and spiral-welded alloy tubes. Specifications: 20*20mm-500mm, wall thickness: 0.6mm-20mm, spiral steel pipes. Spiral steel pipe specifications: 219mm-2020mm, wall thickness: 5mm-20mm. Seamless pipe specifications include: 1/4", 3/8", 1", 1.2", 1.5", 2", 2.5", 3", 4", 5", 6", 8", 102, 108, 127, 133, 139, 159, 168, 177, 194, 219, 273, 325, etc. Alloy tubes generally refer to square and rectangular steel pipes.

Alloy tubes can be categorized into three main types according to their cross-sectional features: equal-wall alloy tubes, non-uniform-wall alloy tubes, and variable-section alloy tubes.