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Square Tube Stainless Steel 304 Stainless steel square tube 304 is a square-shaped tube made of 304 stainless steel. It's also known as stainless square hollow section (SHS). Strength: High strength and tensile strength Corrosion resistance: Resistant to many corrosive agents, including harsh chemicals, fresh water, and salt water Non-magnetic: Non-magnetic in the annealed condition Mechanical properties: Excellent mechanical properties