Our 304 and 316 SS Welded Rectangular/Square Pipe Tubes, with lengths from 1 - 12m, are top - tier products.
304 grade, with 18% chromium and 8% nickel, offers good corrosion resistance, making it ideal for general applications like food and construction. 316 grade, containing molybdenum, has enhanced resistance to pitting and crevice corrosion, perfect for harsh environments such as marine and chemical industries.
The welded construction ensures seamless connection, providing high strength and stability. They are available in various sizes, with precise dimensions for easy installation. Whether for structural frameworks, decorative elements, or fluid - carrying systems, these pipes are reliable choices.
Composition & Corrosion Resistance: Contains 18-20% chromium (Cr), 8-10.5% nickel (Ni), and no molybdenum (Mo). It can resist corrosion from the atmosphere, fresh water, and weak acids/alkalis (e.g., rainwater, civil cleaning agents), making it suitable for dry or slightly humid environments. However, it is prone to pitting corrosion in high-salt (e.g., coastal areas) and high-chloride (e.g., swimming pool water) environments.
Mechanical Properties: Tensile strength ≥ 515MPa, elongation ≥ 40%. It has good weldability and cold workability (can be bent and cut), meeting the structural strength requirements of most non-extreme scenarios.
Typical Applications: Indoor decoration, furniture frames, non-corrosive fluid transportation (e.g., tap water pipelines), building handrails, etc.
2. 316 Stainless Steel Pipes – Corrosion-Resistant Upgraded Version
Composition & Corrosion Resistance: Based on 304, it is added with 2-3% molybdenum (Mo), and the nickel content is increased to 10-14%. It significantly enhances resistance to chloride ions (Cl⁻) and can withstand seawater, salt spray, and chlorine-containing chemical media (e.g., bleaching agents, pickling solutions), making it a representative of "marine-grade" stainless steel.
Mechanical Properties: Tensile strength ≥ 480MPa, elongation ≥ 40%. It has excellent weldability and better high-temperature stability than 304 (the upper limit of long-term service temperature is approximately 870℃).
Typical Applications: Coastal buildings, shipbuilding, chemical pipelines, seawater desalination equipment, structural components in high-humidity and high-salt environments.
3. Common Advantages
Both are austenitic stainless steels, non-magnetic (may have weak magnetism after cold working), and have excellent low-temperature toughness (no brittleness at -196℃).
The surface is smooth and easy to clean. Its appearance and hygiene can be improved through polishing (e.g., No.4 wire drawing, mirror polishing), making it suitable for food contact or decorative scenarios.
II. Rectangular/Square Structure: Functional Advantages Beyond Circular Pipes
Compared with circular pipes, the cross-sectional design of rectangular (flat) and square pipes offers unique values:
Stronger Structural Stability: The flat sides of square/rectangular pipes ensure more uniform force bearing. Their bending and torsion resistance is better than that of circular pipes of the same material and wall thickness, making them suitable for load-bearing scenarios (e.g., building supports, equipment frames).
High Space Utilization: The flat or square shape allows for tight arrangement (e.g., curtain wall keels, shelf columns), reducing installation gaps. It is especially suitable for compact spaces (e.g., indoor partitions, internal pipelines of equipment).
Good Installation & Adaptability: The flat surface is easy to fit and fix with plates and connectors (e.g., flanges, brackets), without the need for additional special-shaped accessories, reducing installation complexity.
Outstanding Decorativeness: The regular geometric shape has a more modern sense than the circular shape, and it is often used in scenarios with aesthetic requirements such as building facades, handrails, and furniture.
