Standard case material grade is API grade K-55 (suitable
for H2S service at all temperatures). Additional material
grades readily available are L-80 and P-110 from 4-1/2 to
13-3/8 inch equipment Q-125 is available in certain sizes.
For other premium material grades, 4140 is heat treated
to match the strength of the desired material.
Float equipment supplied for large-diameter casing (20
in. and larger) can be supplied with X-52 or X-56 material
as specified in API 5L. Slip-joint equipment larger that 20
inches is made from rolled and welded A-36 flat plate.
Other material grades are available upon request.
