API Casing and tubing Standard: API 5CT, Grade: J55.N80.L80.K55,P110 Length: R1.R2.R3 API Casing and tubing1.) Standard: GB,DIN,EN,ASTM2 ... .) Length: 5.8m-12m5.) Condition: Cold-drawn and hot rolled6.) Inspection: Chemical composition, Mechanical properties (Tensile ... strength, Elongation, Flaring, Flattening, Hardness, impact) , OD and WT ,No-destructive,Hydralic7.) Surface treatment: Oil, varnish, ...