OCTG Casing and Tubing Pipe

Supplier info

Company name

Bestar Steel Co., Ltd.

Business type

Manufacturer

Year established

1993

Number of employees

500

Location

China

Exports to

Worldwide

Bestar Steel offers a complete range of API 5CT casing and tubing for all types of oil exploration and production demands. The material includes carbon steel (for the most common use), alloy, chrome and high alloy steels. API 5CT grades cover J55 / K55, N80 type 1 and N80Q, L80, C90, T95, P110, Q125, and with additional requirements of 13 Cr.

Supply Range

Bestar Steel supplies API 5CT casing pipes with the following sizes and specifications:
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

Standard Grade Chemical compositions （％）
API SPEC 5CT J55 C Si Mn P S Cr Ni Cu Mo V
API SPEC 5CT K55 0.34 ～ 0.39 0.20 ～ 0.35 1.25 ～ 1.50 ≤0.020 ≤0.015 ≤0.15 ≤0.20 ≤0.20 / /
API SPEC 5CT N80 0.34 ～ 0.38 0.20 ～ 0.35 1.45 ～ 1.70 ≤0.020 ≤0.015 ≤0.15 / / / 0.11 ～ 0.16
API SPEC 5CT L80 0.15 ～ 0.22 ≤1.00 0.25 ～ 1.00 ≤0.020 ≤0.010 12.0 ～ 14.0 ≤0.20 ≤0.20 / /
API SPEC 5CT P110 0.26 ～ 0.395 0.17 ～ 0.37 0.40 ～ 0.70 ≤0.020 ≤0.010 0.80 ～ 1.10 ≤0.20 ≤0.20 0.15 ～ 0.25 ≤0.08

Mechanical properties of casing pipe

Grade Type Total elongation under load (%) Yield strength (min)Mpa Yield strength (max)Mpa Tensile strength min Mpa Hardness Max (HRC) Hardness Max (HBW)
J55 - 0.5 379 552 517 - -
K55 - 0.5 379 552 655 - -
N80 1 0.5 552 758 689 - -
N80 Q 0.5 552 758 689 - -
L80 1 0.5 552 655 655 23 241
L80 9Cr 0.5 552 655 655 23 241
L80 13Cr 0.5 552 655 655 23 241
C90 - 0.5 621 724 689 25.4 255
C95 - 0.5 655 758 724 - -
T95 - 0.5 655 758 724 25.4 255
P110 - 0.6 758 965 862 - -
Q125 All 0.65 862 1034 931 - -