Well Casing & Tubing
Casing Pipe, Steel Casing Pipe, Well Casing, OCTG Casing
Sizes:
Out Diameter: 1.315"- 20"
Wall Thickness: 0.133"-0.500"
Length:R1(group1),R2(group2),R3(group3)
Materials & Grades:
Casing: API 5CT J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110
Application:
oil well extracting
borehole
borewell
Types:
Connections:
P (Plain end)
STC (short threads)
LTC (long threads)
BTC (buttress threads)
Premium gas-tight connectors
Non-upset ends (NUE)
External upset ends (EUE)
Premium gas-tight connectors
Others special connectors
Chemical compositions of casing pipe
Standard | Grade |
Chemical compositions(%) |
|||||||||
API SPEC 5CT |
J55 |
C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V |
K55 |
0.34~0.39 |
0.20~0.35 |
1.25~1.50 |
≤0.020 |
≤0.015 |
≤0.15 |
≤0.20 |
≤0.20 |
/ | / | |
N80 |
0.34~0.38 |
0.20~0.35 |
1.45~1.70 |
≤0.020 |
≤0.015 |
≤0.15 |
/ | / | / |
0.11~0.16 |
|
L80 |
0.15~0.22 |
≤1.00 |
0.25~1.00 |
≤0.020 |
≤0.010 |
12.0~14.0 |
≤0.20 |
≤0.20 |
/ | / | |
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 | - | - |
Casing Pipe Manufacturing Process:
Steel ingot heating → hydraulic punching → reheating → extension → periodic rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection
1. An annular heating furnace is required for ingot heating;
2. Punching and reheating with hydraulic press;
3. The oil casing plant uses a two-roller guide plate extension machine for extension;
4. Re-use a disc heating furnace for periodic rolling, and use a non-entry furnace for reheating, cooling, straightening, pipe cutting, and inspection.
Color Codes for API 5CT Casing and Tubing: