API N80 Casing
Data verifiedN80 is the mid-strength API 5CT casing and tubing grade for deeper wells beyond J55/K55 capability. Type Q (Q&T) is preferred where collapse resistance and uniform properties matter.
Chemical composition
| Element | Content (%) |
|---|---|
| P | ≤0.030 |
| S | ≤0.030 |
| Note | Type Q is quenched & tempered; Type 1 normalized — chemistry is mill practice |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | 552–758 MPa (80–110 ksi) |
| Tensile strength | ≥689 MPa (100 ksi) |
| Density | 7.85 g/cm³ |
Heat treatment
Type 1: normalized or normalized and tempered. Type Q: quenched and tempered for better collapse and consistency.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | API 5CT N80 (Type 1 / Q) |
| gb | N80 (GB/T 19830) |
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Production casing and tubing, deeper intermediate strings.
Processing: Not for sour service — H2S environments require controlled-hardness grades such as L80/C90 per NACE MR0175.
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Ask for a quotationVisit NasteelSource: API 5CT published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.