API 5CT L80-1 Oil Country Tubular Goods
API 5CT L80-1 Oil Country Tubular Goods (OCTG) is a medium strength petroleum specific pipe material that complies with the American Petroleum Institute (API) 5CT standard. It is mainly used for the production of casing and tubing in oil and gas wells and is suitable for low corrosive environments.
L80-1 is a foundation type under the L80 steel grade, with "L80" indicating a minimum yield strength of 80 ksi (approximately 552 MPa), which has good mechanical properties and economy. L80-1 is made of carbon manganese steel, which does not contain significant alloying elements and has no special corrosion resistance. It is usually protected against corrosion by an external coating (such as epoxy resin).
It is widely used in onshore conventional oil and gas wells, shallow gas reservoirs, and shale gas horizontal wells with low corrosion risks. It is the lowest cost and highest market share model in the L80 series. According to the API 5CT standard, L80-1 can be made into casing, tubing, and drill pipe, with a common outer diameter range of Φ 114.3-508mm and a wall thickness of 5.21-16.13mm. The length is divided into three categories: R1, R2, and R3.
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Chemical Composition Table
| Element | Content Requirement (%) | Notes |
|---|---|---|
| Carbon (C) | ≤0.45 | Controls hardenability, prevents welding cracks |
| Manganese (Mn) | 0.60–1.35 | Enhances strength and toughness |
| Phosphorus (P) | ≤0.030 | Strictly limited to prevent cold brittleness |
| Sulfur (S) | ≤0.025 | Reduces hot cracking and corrosion initiation |
| Silicon (Si) | 0.10–0.45 | Deoxidizer, improves strength |
| Chromium (Cr), Nickel (Ni), Molybdenum (Mo) | No specific requirement | No significant alloy content, distinguishing it from L80-9Cr/L80-13Cr |
Mechanical Properties Table
| Property | Standard Value (API 5CT) | Typical Measured Value |
|---|---|---|
| Yield Strength (YS) | ≥552 MPa | 580–650 MPa |
| Tensile Strength (TS) | 655–827 MPa | 700–780 MPa |
| Elongation (A) | ≥18% | 20–25% |
| Hardness (HB) | ≤255 | 220–240 |
| Impact Toughness (-20℃) | ≥40 J | 50–60 J |
Color Band Identification
Per API 5CT standards, the color band marking for L80-1 is as follows:
Primary Band: Red
Secondary Band: None
Marking Method: A 25mm wide red circumferential band is painted on both ends of the pipe body for rapid field identification of the grade.
Production Casing Size Table
| Nominal Casing Size (inches) | Outside Diameter (mm) | Common Wall Thickness (mm) | Application Segment |
|---|---|---|---|
| 4½ | 114.3 | 6.35, 7.37, 8.56 | Intermediate-depth production zones |
| 5 | 127.0 | 7.52, 9.19 | Conventional oil & gas wells |
| 5½ | 139.7 | 7.72, 9.17, 11.51 | Main production casing |
| 7 | 177.8 | 8.05, 10.36, 12.65 | Deep well completion sections |
| 9⅝ | 244.5 | 9.53, 11.05, 13.84 | Surface/intermediate casing |
API 5CT L80 Type 1 Casing Tolerance Table
| Item | Tolerance Requirement |
|---|---|
| Outside Diameter (OD) | ±0.75% (for wall thickness ≥5.21mm) |
| Wall Thickness (WT) | +12.5% / -10.0% |
| Length | R1: +100mm / -200mm; R2/R3: +100mm / -150mm |
| Ovality | ≤0.75% OD |
| Straightness | ≤3mm/m, total ≤12mm |
| Thread Parameters | Must comply with API 5B standard, with strict tolerances on pitch, taper, and thread height |
API 5CT L80-1 OCTG Factory
API 5CT L80-1 Casing pipe test and inspection
FAQ
What is the chemical composition of API 5CT L80 Type 1
The chemical composition of API 5CT L80 Type 1 is based on carbon manganese steel, without significant alloying elements. The carbon content does not exceed 0.45%, the manganese content is between 0.60% and 1.35%, the phosphorus and sulfur are controlled below 0.030% and 0.025% respectively, the silicon content is between 0.10% and 0.45%, and there are no special requirements for chromium, nickel, molybdenum, etc. It belongs to the category of low-alloy steel and is suitable for low corrosive oil and gas well environments.
Is L80 a low alloy steel
L80 steel grade belongs to the medium strength oil well pipe material under the API 5CT standard, with a minimum yield strength of 80 ksi (approximately 552 MPa). Although its main component is carbon manganese steel (C-Mn), in order to stabilize the structure, improve hardenability and strength, small amounts of alloying elements such as chromium (Cr), molybdenum (Mo), nickel (Ni) are usually added. As long as the total content of these elements is controlled at a low level (generally less than 5%), it meets the definition of low-alloy steel.
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