astm oil pipe 4 inch 1.OD 33mm - 406mm(1aa~16aa) 2.WT: 3~30mm ... 3.ISO Standard,API certificate astm oil pipe 4 inch SpecificationOD 33mm - 406mm(1”~16”) with thickness of 3~ ... -C) etc.Usage Appilcation boiler use,water transport, building, machinery, traffic, aviation, oil development etc. seamless pipe for low and medium ... precision high-quality finish high cleanliness astm oil pipe 4 inch