Various wall thickness custom processing of non-standard pipes includes oval-shaped non-standard steel pipes, triangular non-standard steel pipes, hexagonal non-standard steel pipes, rhombic non-standard steel pipes, octagonal non-standard steel pipes, half-circular non-standard steel pipes, uneven hexagonal non-standard steel pipes, five-petal plum blossom-shaped non-standard steel pipes, double convex non-standard steel pipes, double concave non-standard steel pipes, melon-shaped non-standard steel pipes, conical non-standard steel pipes, and wavy non-standard steel pipes.