Product Overview：
Oil casing belongs to OCTG, manufactured to API 5CT standard. It is used for well cementing and borehole support in oil & gas wells, including surface, intermediate and production casing. Carbon steel grades like J55, N80 fit medium-depth wells; high-strength P110, Q125 suit deep and high-pressure wells. API 5CT casing covers OD 48.3–508mm, wall thickness 5.21–16.13mm. Main steel grades: J55, N80, L80, P110, Q125, available with STC, LTC, BTC threads.
| Product List |
| Product Name: | GB5312 Seamless carbon steel and carbon manganese steel pipes for ships |
| Product Name: | J55 Oil Casing |
| Product Name: | N80 Oil Casing |
| Product Name: | L80 Oil Casing |
| Product Name: | P110 Oil Casing |
| Product Name: | Q125 Oil Casing |
| Product Name: | Hot Rolled Oil Casing |
| Parameter range |
| Outer diameter | Φ48.3mm–Φ508mm (1.9″–20″) |
| Wall thickness | 5.21mm–16.13mm |
| Standard length | R1 8–10m, R2 10–12m, R3 12–13m; support customization of short and long scales |
| Outer diameter accuracy | Per API 5CT, maximum ±0.75% of OD |
| Executive Standards | API 5CT, ISO 11960, GB/T 19830, SY/T 6194 |
| Non-standard customization | Customization of special premium connections, coupling materials, anti-corrosion coating, heat treatment (quenched & tempered), and thread types (STC / LTC / BTC) can all be customized |
| Common specifications |
| Outer diameter (mm) | 60.3 | 73.0 | 88.9 | 114.3 | 139.7（5-1/2'，most commonly used） | 177.8（7'） |
| Wall Thickness (mm) | 4.83 | 5.51 | 6.45 | 6.88 /7.37 | 7.72 /9.17 | 8.05 /10.36 |
| Commonly used steel grades | J55,N80 | J55,N80 | J55,N80,L80 | J55,N80,P110 | J55,N80,L80,P110,Q125 | N80,L80,P110,Q125 |
| Outer diameter (mm) | 219.1 | 244.5（9-5/8'） | 273.1 | 339.7（13-3/8'） | 508.0 |
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| Wall Thickness (mm) | 8.94 | 8.94 /10.03 | 9.19 | 9.65 | 11.13 |
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| Commonly used steel grades | J55,N80,P110 | J55,N80,P110 | J55,N80 | J55,N80 | J55 |
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Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| OD tolerance ≤ ±0.75% OD | Hot rolling |
| OD tolerance ≤ ±1.0% OD | Hot rolling |
| Wall thickness tolerance -5% ~ +12.5% | Hot rolling |
| Length tolerance ≤ ±150mm | Hot rolling |
| High precision thread tolerance | Hot rolling + CNC threading |
| Oil Casing Tolerance Range |
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Item | Tolerance Range |
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Outer Diameter | ≤114.3mm: ±0.75%; >114.3mm: +1.0% / -0.5% |
Wall Thickness | ±12.5% |
Length | Max +1.0m (no short length) |
Straightness | ≤0.2% of total length |
End Squareness | ≤0.5° |
Optional delivery status
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| Oil removal from oil pipes | Annealing and straightening | Steel pipe corrosion prevention |
| Steel pipe threading | Length cut-to-length | Steel pipe coating |
| Steel pipe cap | Exquisite bundling | Beveling |
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Leon
Leon
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