J55 and K55 Oil Casing in API 5CT

1. Heat treatment 
PSL1 requirements: J55 and K55 same way (can be rolled-state delivery); 
PSL2 requirements: J55, K55 product should be normalized or normalized and tempered overall, if thick, should be normalized or normalized and tempered after thickened. 

2. Tensile test 
J55: yield strength of 379MPa ~ 552MPa; tensile ≥517MPa; minimum elongation of J55 is 19%. 
K55: yield strength of 379MPa ~ 552MPa; tensile ≥655MPa; minimum elongation of K55 is 15%. 

3. Impact test 
J55 and K55 impact test must be done, the minimum size of the sample lateral impact energy 20J, the smallest full-size sample longitudinal impact energy 27J. 

4. Wall thickness detection 
PSL1: J55 and K55 for measuring the wall thickness of no coverage requirements; 
PSL2: J55 and K55 for wall thickness measurement and recording deal with the entire length of the best coverage of the surface area of automatic detection system should reach 25%. 

5. NDT 
PSL1: J55 and K55 on the tube did not do destructive testing mandatory requirements; 
PSL2: J55 and K55 for all pipe shall be one or more of the criteria specified in 10.15.5 tested to find the inner surface of the outer surface of the pipe and can receive the level of L4 longitudinal imperfections.