Process method: Cold drawn, cold pilgered Surface finish: Annealed / manual polished / mechanical polished Material: TP304/304L/304H/304LN/321/321H/317L/347/347H, TP310/S, Dual grade TP304/304L & TP316/316L, duplex s31803, 2205, alloy steel 904L and we also produce other specification according to the customers' re Standards: ASTM A269/M, ASTM A312/213, JISG 3459/, EN 10216/ ASTM A789/790, GB/T Size: O. D.: 6mm to 426mm, W. T.: 0.6mm to 40mm