With a recent increase in deep well drilling, there is a growing need for high collapse casing in a minimum yield strength of 95 ksi (655 MPa) grade. Collapse resistance is affected by yield strength, deviation of wall thick-ness, roundness, residual stress and D/t (D for outside diameter and t for wall thickness). Reducing the deviation of wall thickness at hot rolling, controlling yield strength by closely regulating heat treatment conditions, and minimizing the deterioration of roundness and straightness during cooling are performed. This process is governed by our special techniques and knowhow. By using the same material as that for JFE-95T, JFE Steel manufactures JFE-110T which has higher collapse resistance properties than JFE-95T.