China SS304L Stainless Steel Pipe Supplier: ASTM A312 Stainless Seamless Steel Pipe, Schedule 40, 4 1/2 Inches, 20 Feet, Cold Drawn Annealed Pickled. Type: ASTM A312 304L Stainless Steel Pipes. Keywords: ASME A312 Stainless Steel Pipe, 4 1/2 Inches, Schedule 40, 20 Feet. O.D Size: 4 1/2 Inches. Supply Ability: 5000 Mertic Ton/Metric Tons Per Month. Payment Terms: L/C, D/A, D/P, T/T. Standard: Schedule 40. Wall Thickness: 0.237 Inches. Condition: Cold Drawn Annealed Pickled. Length: 20 Feet.