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May 09, 2016 · ERW ROUND STEEL PIPE. Production Range cover 1/2 10, thickness from S06 mm to 10.0 mm. Standard:GB/T 6728, GB/T 3091, ASTM A36, ASTM A53, ASTM A500, BS 7, BS EN 39, JIS G 3444, API 5L, API 5CT.