API 5CT 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. Process: Seamless Standard: API 5CT Out Diameter:Casing: OD 4 1/2"- 20" (114.3mm-508mm) Wall Thickness:0. 205"- 0.875" (5.21mm-22.22mm) Steel Grade: J55,K55,M65,N80-1,N80Q,L80-1,L80-9Cr, L80-13Cr,C90,C95,T95,P110,Q125 Surface:Corrosion proofing water based paint Type of End-Finish: PE,STC,LTC ,BTC Heat treatment:Normalized, Quencher+Temper