Where it fits
Higher-strength casing or tubing service where the well design specifies N80 and the heat-treatment condition and connection are approved.
API 5CT · OCTG grade reference
API 5CT N80 casing and tubing reference
API 5CT N80 / N80-1 / N80Q is a grade-specific reference for engineering selection and RFQ preparation. HONGFENG verifies grade suffix, dimensions, connection, test requirements and documents for each order.
Updated 13 November 2026 · HEBEI HONGFENG IMPORT & EXPORT CO.,LTD
Grade scope
How to read API 5CT N80 / N80-1 / N80Q
N80-1 and N80Q differ in heat treatment; the exact grade suffix, casing/tubing form, weight, length and connection must be stated.
What not to assume
N80 is not automatically a sour-service grade. H2S service requires a separate materials review; L80 or another project-approved grade may be required.
Mechanical snapshotReference values; project and MTC govern
| Property | Reference |
|---|---|
| Yield strength | 552–758 MPa |
| Minimum tensile strength | 689 MPa |
| Product form | Casing / tubing |
| Delivery condition | N80-1 and N80Q differ in heat treatment; the exact grade suffix, casing/tubing form, weight, length and connection must be stated. |
RFQ data
What to send for N80
- Standard edition, grade and delivery suffix
- Product form and outside diameter
- Wall thickness or weight and length range
- Connection, coupling, thread or end preparation
- CVN temperature, energy or project testing
- Quantity, inspection scope, destination and date
Send the grade, dimensions and test requirements
Availability, delivery condition, test regime and documents are confirmed for the exact order. The signed contract and final MTC govern acceptance.
Related grade pages
Grade-specific technical pages
FAQ
API 5CT N80 / N80-1 / N80Q
What are API 5CT N80 mechanical requirements?
The reference range is 552–758 MPa yield and minimum 689 MPa tensile. N80-1 and N80Q have different heat-treatment routes and must be quoted by suffix.
Is N80 suitable for H2S service?
N80 should not be assumed suitable for sour service. H2S partial pressure, hardness, temperature, stress and the applicable project standard require engineering review.
What data is required for an N80 casing quote?
Send the suffix, casing or tubing, OD, wall or weight, R1/R2/R3 length, coupling and thread, inspection scope, well-service conditions and destination.