Oil casing is applied in oil‑gas well exploration and hydrocarbon transportation.

Due to complex underground geological conditions, the pipe body is subjected to combined loads of tension,

compression, bending and torsion, which imposes strict quality requirements on casing.

Once the casing gets damaged, it may lead to production reduction or even abandonment of the entire well.

Steel Grade：H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc

SIZE：OD: 114.3MM—508MM(4 1/2"—20")；WT: 5.21MM-16.13MM(9.5PPF—133PPF)

Standard：API 5CT, GB, ISO11960, GOST

Thread Type：STC, LTC, BTC, XC and Premium connection

Length：R1, R2, R3

Service：NDT etc related rules of API 5CT and 5B