Stainless steel special-shaped tubes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, stainless steel special-shaped pipes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel. Stainless steel special-shaped pipes are generally distinguished according to their cross-section and overall shape. Generally, they can be divided into: oval shaped steel pipe, triangular shaped steel pipe, hexagonal shaped steel pipe, diamond shaped steel pipe, stainless steel patterned pipe, stainless steel U-shaped steel pipe, D-shaped pipe , Stainless steel elbow, S-shaped pipe elbow, octagonal shaped steel pipe, semi-circular shaped steel round, unequal side hexagonal shaped steel pipe, five-petal plum shaped shaped steel pipe, double convex shaped steel pipe, double concave shaped steel pipe, Melon-shaped special-shaped steel pipe, conical special-shaped steel pipe, corrugated special-shaped steel pipe, etc.