Seamless API Steel Pipe1,Website:http://www.sinosteelpipes.com,Specification: Material: 1, ASTM A53, A106, ... Order QuantityUnitAdditional Description4 1/2" oil casingCasing and Tubing Standard: API 5CT,Carbon Steel4 1/2"CM300MeterLength: R2, R3.Application: ... N80, L80, T95, ,5" oil casing pipeCasing and Tubing Standard: API 5CT,Carbon Steel5"CM300MeterLength: R2, R3.Application: serves as walls ...