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OCTG Casing and Tubing Pipe
2024-06-17

Standard and Grades: API 5CT J55 / K55, N80-1, N80Q, C90, T95, P110, Q125 and 13Cr

Casing Pipe Size range: 5 1/2” to 20” Length usually in R3.

Tubing Pipe dimensions range: 1.0”, 1.315”, 1.66”, 1.9”, 2.063”, 2 3/8”, 3 1/2”and 4 1 /2”, Length in R2.

Type of connections for Casing: BTC (thread coupling buttress), LTC (long round thread coupling), premium connection.

Types of connections for Tubing: BTC, NUE, EUE, Premium



Chemical compositions of casing pipe

StandardGradeChemical compositions（％）
API SPEC 5CTJ55CSiMnPSCrNiCuMoV
K550.34～0.390.20～0.351.25～1.50≤0.020≤0.015≤0.15≤0.20≤0.20//
N800.34～0.380.20～0.351.45～1.70≤0.020≤0.015≤0.15///0.11～0.16
L800.15～0.22≤1.000.25～1.00≤0.020≤0.01012.0～14.0≤0.20≤0.20//
P1100.26～0.3950.17～0.370.40～0.70≤0.020≤0.0100.80～1.10≤0.20≤0.200.15～0.25≤0.08



Mechanical properties of casing pipe

GradeTypeTotal elongation
under load
 (%)		Yield strength
 (min)Mpa		Yield strength
(max)Mpa		Tensile strength
min Mpa		Hardness
Max (HRC)		Hardness
Max (HBW)
J55-0.5379552517--
K55-0.5379552655--
N8010.5552758689--
N80Q0.5552758689--
L8010.555265565523241
L809Cr0.555265565523241
L8013Cr0.555265565523241
C90-0.562172468925.4255
C95-0.5655758724--
T95-0.565575872425.4255
P110-0.6758965862--
Q125All0.658621034931--
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