... we have API certificate Type:API 5CT J55 petroleum casing pipeOD:20mm-2900mmWall thickness6-60mmStandardASTM A53, API 5L, ... customers’ requirement.ApplicationPetroleum ,power, gas, chemical and medical equipment, foodstuff, papermaking ,aviation, smelting, boiler heat ,shipbuilding ... process is made under the ISO9001:2000strictly. API certificate1/2"SCH40SCH803/4"SCH40SCH801"SCH40SCH802"SCH40SCH803" ...