N80Q is a high-strength carbon steel grade defined under the API 5CT standard for oil and gas casing and tubing. The “Q” denotes a quenched-and-tempered manufacturing process, which distinguishes it from the normalized N80 (N80-1) grade and gives the material a more refined, uniform microstructure.
- Casing, Tubing & Casing Pipe
Grade N80Q Quenched and Tempered Casing Steel
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Product Detail
Chemical Component
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Quick Details
Standard:
API 5CT
Grade:
N80Q
Thickness:
2.9-60mm
Thread Type:
STC BTC LTC
Outer Diameter:
Ф114.3-406
Place of Origin:
Baotou, China(Mainland)
Function:
Structural Support; Wellbore Protection
Technique:
Hot Rolled; Seamless
Certification:
API 5CT
Surface Treatmen:
According to customers request
Alloy Or Not:
No
length:
R1 R2 R3
Supply Ability:
( 180.0000 )Ton/Tons per year
Installation location:
Close to the open hole wall
Collapse Resistance:
≥2,000 psi
Brand:
Baotou steel
Application:
Medium and high pressure oil and gas wells
Risk of failure:
Blowouts; Formation Contamination; Borehole Deformation
Chemistry Component
| Grade | Type | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | ||||
| Min | Max | Min | Max | Min | Max | Min | Max | Max | Max | Max | Max | Max | ||
| H40 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| J55 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| K55 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| N80 | 1 | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – | |
| N80 | Q | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| R95 | – | – | 0.45 | – | 1.90 | – | – | – | – | – | – | 0.030 | 0.030 | 0.45 |
| L80 | 1 | – | 0.43 | – | 1.90 | – | – | – | – | 0.25 | 0.35 | 0.030 | 0.030 | 0.45 |
| L80 | – | – | 0.15 | 0.30 | 0.60 | 0.90 | 1.10 | 8.00 | 10.0 | 0.50 | 0.25 | 0.020 | 0.010 | 1.00 |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1.00 | – | – | 12.0 | 14.0 | 0.50 | 0.25 | 0.020 | 0.010 | 1.00 |
| C90 | 1 | – | 0.35 | – | 1.20 | 0.25 | 0.85 | – | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
| T95 | 1 | – | 0.35 | – | 1.20 | 025 | 0.85 | 0.40 | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
| C110 | – | – | 0.35 | – | 1.20 | 0.25 | 1.00 | 0.40 | 1.50 | 0.99 | – | 0.020 | 0.005 | – |
| P110 | – | – | – | – | – | – | – | – | – | – | – | 0.030 | 0.030 | – |
| Q125 | 1 | – | 0.35 | – | 1.35 | – | 0.85 | – | 1.50 | 0.99 | – | 0.020 | 0.010 | – |
Mechanical Propert
| Grade | Type | Total under load Elongation % | Yield strength megapascal | Tensile strength megapascal | Hardness a, C Maximum | Specified OD mm | Allowable hardness Variation | ||
| Min | Max | Min | HRC | HBW | HRC | ||||
| H40 | – | 0.5 | 276 | 552 | 414 | – | – | – | – |
| 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 | – | – | – | – |
| R95 | – | 0.5 | 655 | 758 | 724 | – | – | – | – |
| L80 | 1 | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 3Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 9Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
| L80 | 13Cr | 0.5 | 552 | 655 | 655 | 23.0 | 241 | – | – |
|
C90 |
– |
0.5 |
621 |
724 |
689 |
25.4 |
255 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05 to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
|
T95 |
– |
0.5 |
655 |
758 |
724 |
25.4 |
255 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05 to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
|
C110 |
– |
0.7 |
758 |
828 |
793 |
29 |
279 | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| 19.05o to 25.39 | 5.0 | ||||||||
| ≥25.40 | 6.0 | ||||||||
| P110 | – | 0.6 | 758 | 965 | 862 | – | – | – | – |
| Q125 | – | 0.65 | 862 | 1034 | 931 | b | – | ≤12.70 | 3.0 |
| 12.71 to 19.04 | 4.0 | ||||||||
| ≥19.05 | 5.0 | ||||||||
Color Discrimination
| Grade | Type | Straps for products longer than 1.8 meters Quantity and color | Coupling color | |
| The whole coupling | Brand | |||
| H40 | No belt or black belt, to be selected by the manufacturer | not have | Same as for the pipeline | |
| J55 | A sea of green | Bright green | One white | |
| K55 | Two emerald green | Bright green | not have | |
| N80 | 1 | One red | red | not have |
| N80 | Q | One is red, the other emerald green | red | green |
| R95 | One brown | brown | not have | |
| L80 | 1 | One red, one brown | red | One brown |
| L80 | 3Cr | One red and one white | red | One white |
| L80 | 9Cr | One red, one brown, two yellow | not have | Two yellows |
| L80 | 13Cr | One red, one brown and one yellow | not have | One yellow |
| C90 | A purple one | purple | not have | |
| T95 | One silver | silvery | not have | |
| C110 | One white, two brown | white | Two brown | |
| P110 | One white | white | not have | |
| Q125 | One orange | orange | not have | |
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