API 5CT Grade L80 Type 1 Casing And Tubing
API 5CT Grade L80-1 casing and tubing is a high-strength, moderately corrosion-resistant petroleum specific pipe widely used in the cementing and production processes of onshore and offshore oil and gas wells. Its steel grade "L80-1" is represented as a basic type (Type 1) in the L80 grade under the API 5CT standard, with uniform chemical composition and mechanical performance requirements, suitable for conventional deep well drilling in non sulfur service environments.
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API 5CT L80-1 Oilfield Tubing Chemical Composition Table
| Element | Requirement (%) | Notes |
|---|---|---|
| C (Carbon) | ≤ 0.45 | Controls strength and weldability |
| Mn (Manganese) | 0.50 - 1.65 | Enhances strength and toughness |
| P (Phosphorus) | ≤ 0.030 | Strictly limited to reduce cold brittleness |
| S (Sulfur) | ≤ 0.030 | Limits segregation and hot cracking tendency |
| Si (Silicon) | 0.15 - 0.35 | Deoxidizer, improves strength |
| Cr (Chromium) | ≤ 1.00 | Not a primary alloying element; distinguishes from L80-13Cr |
| Mo (Molybdenum) | ≤ 0.20 | May be added in trace amounts to improve hardenability |
| Ni (Nickel) | ≤ 1.00 | Enhances low-temperature toughness |
API 5CT L80-1 Oil Well Drilling Tube Mechanical Properties Table
| Property | Requirement | Test Standard |
|---|---|---|
| Minimum Yield Strength | 552 MPa (80 ksi) | API 5CT / SY/T 6194 |
| Maximum Yield Strength | 758 MPa | Prevents excessive brittleness |
| Tensile Strength | ≥ 655 MPa | GB/T 228.1 |
| Elongation | ≥ 18% (50mm gauge) or ≥ 20% (200mm gauge) | GB/T 228.1 |
| Brinell Hardness (HB) | ≤ 230 HB | No NACE sour service certification required |
| Charpy V-Notch Impact Energy | As per agreement | Typically tested for low-temperature applications |
API 5CT L80-1 Oilfield Casing Pipes Specification
| Item | Parameter |
|---|---|
| Standard | API 5CT (Latest 11th Edition) |
| Grade | L80-1 (Type 1) |
| Application | Casing and tubing for oil & gas wells in non-sour environments |
| Delivery Condition | Hot-rolled or normalized heat treatment |
| Thread Types | BTC (Short Round), LTC (Long Round), STC (Buttress), XC (Premium Connection) |
| End Finishing | Threaded with coupling, plain end, external upset, etc. |
| Surface Treatment | Painted for rust protection, thread ends protected with caps |
| Inspection Items | Hydrostatic test, tensile test, flattening test, chemical analysis, NDT |
API 5CT Grade L80-1 Casing Tubing Color Codes Table
| Grade | Color Marking (on coupling or pipe body) | Marking Method |
|---|---|---|
| L80-1 | One green band | ~25 mm wide, located on coupling or pipe end |
API 5CT L80-1 Oilfield Tubing Production Casing Size Table
| Casing OD (in) | Casing OD (mm) | Typical Wall Thickness (mm) | Common Grade | Application |
|---|---|---|---|---|
| 4½ | 114.3 | 6.35 – 9.17 | L80-1 | Production zone in medium-depth wells |
| 5 | 127.0 | 6.43 – 9.19 | L80-1 | Main production casing |
| 5½ | 139.7 | 7.72 – 11.05 | L80-1 | Cementing support |
| 7 | 177.8 | 8.05 – 11.51 | L80-1 | Surface/intermediate casing |
| 9⅝ | 244.5 | 8.94 – 11.05 | L80-1 | Large-diameter cementing |
| 13⅜ | 339.7 | 9.65 – 12.70 | L80-1 | Surface casing |
API 5CT L80-1 Petroleum Casing Pipe Tolerance Table
| Item | Allowable Deviation | |
|---|---|---|
| Outside Diameter Tolerance | ||
| ≤ 101.60 mm | ±0.79 mm | |
| ≥ 114.30 mm | +1.0% / -0.5% | |
| Wall Thickness Tolerance | 0 to -12.5% | |
| Length Tolerance (R-2) | +100 mm / -200 mm | |
| Ovality | ≤ 80% of OD tolerance | |
| Straightness (Bending) | ≤ 3 mm per meter |
API 5CT Gr. L80-1 Pipes Inspection Methods Table
| Inspection Item | Method | Applicable Standard |
|---|---|---|
| Chemical Analysis | Spectrometry, wet chemical analysis | ASTM E350 / E1086 |
| Mechanical Testing | Tensile, hardness, impact tests | GB/T 228.1 / ASTM E18 / E23 |
| Hydrostatic Test | Apply water pressure on each pipe, hold ≥5 seconds | API 5CT / SY/T 6194 |
| Non-Destructive Testing (NDT) | Eddy current, ultrasonic testing | API 5CT / ISO 9329 |
| Flattening Test | Verify plastic deformation capability | GB/T 246 |
| Thread Inspection | Use go/no-go gauges to check thread accuracy | API 5B |
| Surface Quality Check | Visual + magnetic particle inspection; cracks/folds prohibited | API 5CT |
API 5CT L80-1 OCTG Test and inspection
API 5CT L80-1 Oil casing pipe Factory
FAQ
What is the difference between L80 and L80 Type 1?
API 5CT Grade L80 is a general term referring to casing and tubing steel grades that comply with the API 5CT standard and have a minimum yield strength of 80 ksi (552 MPa); And L80 Type 1 is a specific type (Type 1) under the L80 level, with clear and unified chemical composition and mechanical performance requirements, belonging to a subset of L80.
What is the difference between API 5CT L80-1, L80-9Cr and L80-13Cr?
Although API 5CT L80-1, L80-9Cr, and L80-13Cr belong to the L80 steel grade (with a minimum yield strength of 552 MPa), they have significant differences in chemical composition, corrosion resistance, and application scenarios.
L80-1: It is a common low-alloy steel with a chromium content of ≤ 1.0% and no special corrosion resistance. It is suitable for non sulfur conventional oil and gas wells.
L80-9Cr: containing about 8.5-9.5% chromium, it has good resistance to CO ₂ corrosion and is suitable for medium corrosive environments, such as deep wells containing carbon dioxide.
L80-13Cr: Contains 12-13.5% chromium and adds elements such as molybdenum and nickel to form a "chromium based passivation film". It has excellent resistance to CO ₂, H ₂ S, and chloride ion corrosion, and is specifically designed for deep wells or marine oil fields with high sulfur and high acidity conditions.
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