Stainless steel special-shaped tubes refer to a category of steel tube products whose cross-sectional shapes differ from standard round tubes. They are primarily used in fields such as architectural decoration and mechanical manufacturing. Based on production processes, they can be divided into two main categories: welded and seamless. The primary materials used are corrosion-resistant stainless steels such as 304 and 316L. The products feature high bending strength and lightweight construction, and can be processed into over 20 different cross-sectional shapes, such as triangular and hexagonal, using one-step forming technology. By 2025, typical products will have wall thicknesses ranging from 0.6 to 20 mm, standard lengths of 6 meters, and support for custom non-standard specifications.

Stainless steel special-shaped tubes refer to non-circular cross-section steel tubes made of stainless steel. Based on manufacturing processes, they can be divided into: welded special-shaped tubes: formed by bending and welding sheets, suitable for processing complex cross-sectional shapes; and seamless special-shaped tubes: formed using extrusion processes, primarily used in high-pressure applications.
By 2024, common materials include grades such as 304, 316L, and 309S, with 304 stainless steel accounting for over 60% of the market. The 316L grade offers improved corrosion resistance but at a higher cost.