Material: Stainless Steel; S/S; Type: Circular Tube, Flat / rectangular Tube, Square Tube and Perforated Tube; Size: 0.5 Inch to 8.75 inch Dia. with the thickness form 0.4mm to 4mm Classification of stainless steel: 1. By microstructure in room temperature, there are martensitic, austenitic, ferritic and duples stainless steel; 2. By the chemical composition, there are two classes- Chromium and Chromium-nickel stainless steel; 3. By the purpose, there are nitric-acid resistant s/s, sulfuric-acid resistant s/s, seawater resistant s/s 4. By the corrosion resisting property, there are pitting-corrosion resistant s/s, , stress-corrosion resistant s/s 5. By the function, there are non-magnetic s/s, free-cutting s/s, low-temperature s/s, high-strength s/s