Peotroleum and natureal gas industies - Steel pipes for use as casing or tubing for wells. 
Standard: 

API SPEC 5CT
Size (mm):

Outer Dimensions: 6.0mm ~ 219.0mm
Wall Thickness: 1.0mm ~ 30 mm
Length: max 12000mm 

ASTM A106 Seamless Steel Pipe

ASTM A53 Black and Hot Dip Galvanized Steel Pipe

ASTM A179 Heat Exchanger and Condenser Tube

ASTM A192 High Pressure Boiler Tube

ASTM A213 Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tube

We could also arrange the production according to other standard, such as ASTM A333, DIN 1629, DIN 2391, DIN 17175, EN10305, EN10216, etc.
 

Packing:

Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements .

Painting:

As requested.

Application:

Gas, water and oil transportation in both oil and natural gas .

Steel grade:

J55, K55, N80, L80, P110.

API 5CT oil casing used in oil well drilling, which is mainly used for drilling and completion of the right wall of the support, to ensure that the conduct and completion of the drilling process after the normal operation of the wells. Casing is to maintain the wells run lifeline. 

As different geological conditions, underground complex stress state, pulling, pressing, bending, torsional stress acting on the combined effect of the tube, which the casing itself, the quality of the higher requirements. Once the casing itself is damaged for some reason, could lead to the whole production wells, or even scrapped.