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Quick Details Standard:API, ASTM, BS, DIN, GB, JIS Standard2:API 5CT, API 5L, ASTM A312M-2007, ASTM A53M-2007, BS EN10219, DIN 1626, DIN 17175, GB/T8162, GB/T8163, JIS G3452-2004, JIS G3456-2004, JIS ...