API 5CT oil pipe OD:4 -1/2"-20" WT:1.7mm-16.3mm ... ,L80,N80,P110 Length:R1 R2.R3 API 5CT oil pipe Used in the oil casing, natural gas .fertilizer,boiler ,power ... pressure,medium and low pressure ,stainless steel pipes and oil pipe with different material standards for more than 15 professsional business experience ...