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By certification 
If you are planning to wholesale high quality oil casing seamless steel pipe from one of the leading api 5l oil pipe, api 5ct oil pipe, api 5d oil pipe manufacturers and factory, please feel free to contact us.
Casing & Tubing
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or well bore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place. Steel Casing Pipes have smooth wall & minimum yield strength of 35,000 psi.
API 5CT PSL-1, PSL-2H-40, J-55, K-55, L-80, N-80, C-90, C-95, T-95, P-110, Q-125
For Standard and High Collapse Applications
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Tubing is pipe used for the transportation of crude oil and natural gas from an oil or gas layer to the surface after drilling is complete. It is made to withstand the pressure generated from the extraction process. Tubing is manufactured in the same way as casing, except that an additional process known as "upsetting" is applied to thicken the pipes.
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