Stainless steel railing materials are categorized into various types, including general carbon steel pipes, carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, and double metal composite pipes, coated pipes, and lined pipes, all designed to conserve valuable metals and meet special requirements.

Stainless steel pipes come in a wide variety, each with different uses and skill requirements, as well as distinct production methods. The outer diameter of the pipes produced at that time ranged from 0.1 to 4500mm, and the wall thickness ranged from 0.01 to 250mm. To differentiate their features, pipes are generally categorized as follows. Stainless steel pipes can be divided into round pipes and shaped pipes based on their cross-sectional shape.

Non-circular tubes include rectangular, rhombic, elliptical, hexagonal, octagonal, and various asymmetric cross-section tubes. Non-circular tubes are widely used in various structural components, tools, and mechanical parts. Compared to round tubes, non-circular tubes generally have larger inertia moments and section moduli, offering greater bending and torsional resistance, which can significantly reduce structural weight and save steel. Stainless steel tubes can be categorized into uniform cross-section tubes and variable cross-section tubes according to their longitudinal cross-sectional shapes.

Variable-section pipes include conical pipes, stepped pipes, and periodic-section pipes, etc. They can be categorized by use into oil well pipes (casing, tubing, and drill pipes, etc.), pipeline pipes, boiler pipes, mechanical structural pipes, hydraulic support pipes, gas cylinder pipes, geological pipes, chemical industry pipes (high-pressure fertilizer pipes, petroleum cracking pipes), and ship pipes, etc.