API 5CT
J55 PSL2and K55 PSL2 should be normalized or normalized and tempered. If thickened, normalizing or normalizing and tempering should be added after thickening. API 5CT K55 PSL2 is the same rolling delivery with API 5CT J55 PSL1;API 5CT K55/J55 Chemical Composition
Grade C≤ Si≤ Mn≤ P≤ S≤ Cr≤ Ni≤ Cu≤ Mo≤ V≤ API 5CT K55/J55 0.34-0.39 0.20-0.35 1.25-1.50 0.020 0.015 0.15 0.20 0.20 / /API 5CT K55/J55 Mechanical Property
Steel Grade Yield Strength (Mpa) Tensile Strength (Mpa) Total Elongation under load % API 5CT K55 379-552 ≥655 0.5 API 5CT J55 379-552 ≥517 0.5Heat treatment (PSL2 and PSL1 are different)
API 5CT J55 PSL1 and API 5CT K55 PSL2 is the same (Rolling delivery);
PSL2 :J55 and K55 should be normalized or normalized and tempered. If thickened, normalizing or normalizing and tempering should be added after thickening.
Impact test (PSL2 and PSL1 are different)
Tubing: PSL1, J55 and K55 have no requirement; PSL2 J55 and K55 require minimum impact work 20J of full size specimen, and minimum impact work 27J of full size specimen.
Coupling: J55 and K55 impact tests are necessary. The minimum impact energy of the specimen is 20J, and the minimum impact energy of the full size specimen is 27J.
Post time: Oct-19-2021With high quality products and considerate service, we will work together with you to enhance your business and improve the efficiency. Please don't hesitate to contact us to get more details of API 5CT K55 casing.