.

Casing & Tubing

Standard: API SPEC 5CT Standard of American Petroleum Institute Steel Grade: J55, K55, N80, L80, N80-1, N80Q P110 etc. Diamensional tolerances: Types of steel tubes Outer diameter Wall thickness Cold-rolled tubes Tube sizes (mm) Tolerances(mm) Tolerances(mm) <114.3 ±0.79 -12.5% ≥114.3 -0.5%,+1% Mechanical properties: Standard codes Models of steel tubes Tensite strength(MPa) Yield strength(MPa) Elongation(%) Hardness API SPEC 5CT J55 ≥517 379~552 check the table K55 ≥517 ≥655 N80 ≥689 552~758 L80(13Cr) ≥655 552~655 ≤241HB P110 ≥862 758~965


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