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 reg- ulating 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.
Seamless, quenched and tempered
|Grade||C, max.||Si, max.||Mn, max.||P, max.||S, max.|
min. ksi (MPa)
|110 (758)|| As Per
|Please ask JFE representative|