API 5CT N80
API 5CT N80
API 5CT N80 oilfield casing pipe is available in N80-1 and N80-Q varieties. The chemical composition and mechanical properties of these two materials are identical; the only difference is in the heat treatment.
API 5CT N80-1 steel is heat-treated by normalizing and tempering, whereas API 5CT N80Q steel is heat-treated by quenching and tempering. As a result, the collapse and internal pressure strengths of N80Q are greater than those of N80-1. When the N80 case is used, the designer should clearly display N80-1 or N80Q.
Because of the high capability of N80 material, API-5CT casing pipes are widely used in natural gas, coal bed methane extraction, and geothermal wells.
PRODUCT FEATURES
Product Description of API 5CT N80
Product Name | API-5CT N80     | |
Size | O. D | 26.67-508mm |
W. T | 2.87-16.13mm | |
Length | R1(5.49-6.71m),R2(8.23-9.14m),R3(11.58-13.72m) | |
Type of End Finish |
| |
Surface |
| |
Standard | API 5CT | |
Application | Tube for conveying gas, water, and oil in both and natural gas industries, etc. | |
Chemical Composition of API 5CT N80
Group | Grade | Type | C | Mn | Mo | Cr | Ni max. | Cu max. | P max. | S max. | Si max. | ||||
min. | max. | min. | max. | min. | max. | min. | max. | ||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
 | N80 | 1 | – | – | – | – | – | – | – | – | – | – | 0.03 | 0.03 | – |
 | N80 | Q | – | – | – | – | – | – | – | – | – | – | 0.03 | 0.03 | – |
Mechanical Analysis of API 5CT N80
API 5CT Casing Pipe Standard | API 5CT Casing Pipe Type | API 5CT Casing Pipe Tensile Strength | API 5CT Casing Pipe Yield Strength | API 5CT Casing Pipe Hardness |
API SPEC 5CT | 1/Q | ≥689 | 552 ~ 758 | —- |
Test of API 5CT N80 Steel Pipe
- Chemical Component Analysis.
- Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation).
- Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test, etc.
- Exterior Size Inspection.
- Nondestructive Test (Ultrasonic flaw detector, Eddy current flaw detector), Hydrostatic Test.
API 5CT N80 Casing and Tubing Specifications
Code a | Outer Diameter | Nominal Weight | Wall Thickness | End Processing Type | |
mm | kg/m | mm | N801 | ||
In | Lb/ft | N80Q | |||
1 | 2 | 3 | 4 | 5 | 10 |
4-1-2 | 9.5 | 114.3 | 14.14 | 5.21 | – |
4-1-2 | 10.5 | 114.3 | 15.63 | 5.69 | – |
4-1-2 | 11.6 | 114.3 | 17.26 | 6.35 | – |
4-1-2 | 13.5 | 114.3 | 20.09 | 7.37 | LB |
4-1-2 | 15.1 | 114.3 | 22.47 | 8.56 | – |
5 | 11.5 | 127 | 17.11 | 5.59 | – |
5 | 13 | 127 | 19.35 | 6.43 | – |
5 | 15 | 127 | 22.32 | 7.52 | – |
5 | 18 | 127 | 26.79 | 9.19 | LB |
5 | 21.4 | 127 | 31.85 | 11.1 | LB |
5 | 23.2 | 127 | 34.53 | 12.14 | – |
5 | 24.1 | 127 | 35.86 | 12.7 | – |
5-1-2 | 14 | 139.7 | 20.83 | 6.2 | – |
5-1-2 | 15.5 | 139.7 | 23.07 | 6.98 | – |
5-1-2 | 17 | 139.7 | 25.3 | 7.72 | LB |
5-1-2 | 20 | 139.7 | 29.76 | 9.17 | – |
5-1-2 | 23 | 139.7 | 34.23 | 10.54 | LB |
6-5-8 | 20 | 168.28 | 29.76 | 7.32 | – |
6-5-8 | 24 | 168.28 | 35.72 | 8.94 | – |
6-5-8 | 28 | 168.28 | 41.67 | 10.59 | LB |
6-5-8 | 32 | 168.28 | 47.62 | 12.06 | – |
7 | 17 | 177.8 | 25.3 | 5.87 | – |
7 | 20 | 177.8 | 29.76 | 6.91 | – |
7 | 23 | 177.8 | 34.23 | 8.05 | – |
7 | 26 | 177.8 | 38.69 | 9.19 | LB |
7 | 29 | 177.8 | 43.16 | 10.36 | – |
7 | 32 | 177.8 | 47.62 | 11.51 | – |
7 | 35 | 177.8 | 52.09 | 12.65 | LB |
7-5-8 | 24 | 193.68 | 35.72 | 7.62 | – |
7-5-8 | 26.4 | 193.68 | 39.29 | 8.33 | – |
7-5-8 | 29.7 | 193.68 | 44.2 | 9.52 | – |
7-5-8 | 33.7 | 193.68 | 50.15 | 10.92 | – |
7-5-8 | 39 | 193.68 | 58.04 | 12.7 | LB |
7-5-8 | 42.8 | 193.68 | 63.69 | 14.27 | – |
7-5-8 | 45.3 | 193.68 | 67.41 | 15.11 | – |
7-5-8 | 47.1 | 193.68 | 70.09 | 15.88 | – |
8-5-8 | 24 | 219.08 | 35.72 | 6.71 | – |
8-5-8 | 28 | 219.08 | 41.67 | 7.72 | – |
8-5-8 | 32 | 219.08 | 47.62 | 8.94 | – |
8-5-8 | 36 | 219.08 | 53.57 | 10.16 | LB |
8-5-8 | 40 | 219.08 | 59.53 | 11.43 | LB |
8-5-8 | 44 | 219.08 | 65.48 | 12.7 | – |
8-5-8 | 49 | 219.08 | 72.92 | 14.15 | – |
Code a | Outer Diameter | Nominal Weight | Wall Thickness | End Processing Type | |
mm | kg/m | mm | J55 | ||
In | Lb/ft | K55 | |||
1 | 2 | 3 | 4 | 5 | 7 |
9-5-8 | 32.3 | 244.48 | 48.07 | 7.92 | – |
9-5-8 | 36 | 244.48 | 53.57 | 8.94 | – |
9-5-8 | 40 | 244.48 | 59.53 | 10.03 | LB |
9-5-8 | 43.5 | 244.48 | 64.73 | 11.05 | LB |
9-5-8 | 47 | 244.48 | 69.94 | 11.99 | – |
9-5-8 | 53.5 | 244.48 | 79.62 | 13.84 | – |
9-5-8 | 58.4 | 244.48 | 86.91 | 15.11 | – |
10-3-4 | 32.75 | 273.05 | 48.74 | 7.09 | – |
10-3-4 | 40.5 | 273.05 | 60.27 | 8.89 | – |
10-3-4 | 45.5 | 273.05 | 67.71 | 10.16 | – |
10-3-4 | 51 | 273.05 | 75.9 | 11.43 | SB |
10-3-4 | 55.5 | 273.05 | 82.59 | 12.57 | SB |
10-3-4 | 60.7 | 273.05 | 90.33 | 13.84 | – |
10-3-4 | 65.7 | 273.05 | 97.77 | 15.11 | – |
11-3-4 | 42 | 298.45 | 62.5 | 8.46 | – |
11-3-4 | 47 | 298.45 | 69.94 | 9.53 | – |
11-3-4 | 54 | 298.45 | 80.36 | 11.05 | – |
11-3-4 | 60 | 298.45 | 89.29 | 12.42 | SB |
13-3-8 | 48 | 339.72 | 71.43 | 8.38 | – |
13-3-8 | 54.5 | 339.72 | 81.1 | 9.65 | – |
13-3-8 | 61 | 339.72 | 90.78 | 10.92 | – |
13-3-8 | 68 | 339.72 | 101.19 | 12.19 | SB |
13-3-8 | 72 | 339.72 | 107.15 | 13.06 | SB |
16 | 65 | 406.4 | 96.73 | 9.53 | – |
16 | 75 | 406.4 | 111.61 | 11.13 | – |
16 | 84 | 406.4 | 125.01 | 12.57 | – |
18-5-8 | 87.5 | 473.08 | 130.21 | 11.05 | – |
20 | 94 | 508 | 139.89 | 11.13 | – |
20 | 106.5 | 508 | 158.49 | 12.7 | – |
20 | 133 | 508 | 197.93 | 16.13 | – |
S-Short round thread, L-Long round thread, B-Buttress thread | |||||
a. Code is used for ordering reference. | |||||
b. The nominal weight of threaded and coupled casing (column 2) is shown for reference only. | |||||
