gas and oil line pipe Normal OD: 42.3-244.5mm Wall ... X42, L45StandardGB/T9711.1Length5m-12mUsageline pipe, casing and tubing, fluid pipe, water delivery, heating pipe, power pipe, structure pipe, scaffold, piling pipeManufacture processesRaw ... impact test,metallographic examinationFinal product testhydraulic test,on-line and off- line ultrasonic test, tensile test,yeild strength,elogation hardness ...