Sell Casing, Tubing& Linepipe

Casing, Tubing& Linepipe
Standard: API SPEC 5CT Standard of American Petroleum Institute
Steel Grade : J55, K55, N80, L80, P110 etc.

Dimensional tolerances:
Types of steel tubes Outer diameter Wall thickness
Cold-rolled tubes Tube sizes(mm) Tolerances(mm) Tolerances(mm)
<114.3 10.79 -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

Chemical Composition :
Standard codes Models of steel tubes Chemical compositions (%)
C Si Mn P S Cr Ni Cu Mo V Als
API SPEC 5CT J55K55(37Mn5) 0.34~0.39 0.20~0.35 1.25~1.50 <=0.020 <=0.015 <=0.15 <=0.20 <=0.20 0 0 <=0.020
N80(36 Mn2V) 0.34~0.38 0.20~0.35 1.45~1.70 <=0.020 <=0.015 <=0.15 0 0 0 0.11~0.16 <=0.020
L80(13Cr) 0.15~0.22 <=1.00 0.25~1.00 <=0.020 <=0.010 12.0~14.0 <=0.20 <=0.20 0 0 <=0.020
P110(30CrMo) 0.26~0.35 0.17~0.37 0.40~0.70 <=0.020 <=0.010 0.80~1.10 <=0.20 <=0.20 0.15~0.25 <=0.08 <=0.020