Product Overview：
Seamless steel pipes for petroleum are mainly used for seamless steel pipes for furnace tubes, heat exchanger tubes, and pipelines in petroleum/refining plants. Hardness is generally measured by three indicators: Brinell, Rockwell, and Vickers. Brinell hardness is widely used and is often represented by the indentation diameter to indicate the hardness of steel pipes, but it is not suitable for harder or thinner steel pipes. Rockwell hardness has a wide range of applications and is suitable for measuring steel pipes ranging from extremely soft to extremely hard. However, due to its small indentation, the hardness value is not as accurate as the Brinell method. Vickers hardness can be used to determine the hardness of very thin steel pipes and surface layers. Execution standard: GB9948. Representative materials: 10 #, 20 #, 15CrMo, etc.
| Product List |
| Product Name: | GB9948 Seamless steel pipes for petroleum cracking |
| Product Name: | YB528 petroleum drilling pipe | seamless steel pipe |
| Product Name: | Hot-rolled seamless steel pipe for petroleum |
| Product Name: | 20 # Seamless Steel Pipe for Petroleum | Seamless Pipe |
| Product Name: | P11 seamless steel pipe for petroleum | seamless pipe |
| Product Name: | Seamless steel pipe for petroleum transportation | Seamless pipe |
| Product Name: | API drilling oil casing | seamless steel pipe |
| Product Name: | National standard seamless steel pipe for petroleum | Seamless pipe |
| Parameter range |
| Outer diameter | Φ6mm‑Φ219mm |
| Wall thickness | 0.5mm‑20mm |
| Standard length | 1‑12m， Support customization of short and long scales |
| Outer diameter accuracy | Maximum ± 0.03mm |
| Executive Standards | API SPEC 5CT, API 5L, ISO 3183, GB/T 9711 |
| Non-standard customization | Special wall thickness, inner hole processing, pressure tolerance, heat treatment, thread processing, and anti-corrosion treatment can all be customized |
| Petroleum Cracking Tube GB/T 9948-2025 (Refinery Unit Furnace Tube and Pipeline) |
| Outer diameter (mm) | 48
| 60 | 76 | 89 | 114 | 159 | 219 |
| Common wall thickness (mm) | 4、5、6 | 5、6、7 | 6、7、8 | 6、7、8、10 | 6、8、10、12 | 8、10、12、14 | 10、12、14、16 |
| Oil well tubing GB/T 19830-2023 (oil production tubing) |
| Steel grade: J55, N80, P110 |
| Nominal inch | 2‑3/8 | 2‑7/8 | 3‑1/2 | 4‑1/2 |
| Outer diameter (mm) | 60.32 | 73.02 | 88.90 | 114.30 |
| Common wall thickness (mm) | 4.83 | 5.51 | 6.45 | 6.88 |
| Oil well casing GB/T 19830-2023 (wellbore casing) |
| Steel grade: J55, N80, P110 |
| Nominal inch | 4‑1/2 | 5‑1/2 | 6‑5/8 | 7 | 9‑5/8 |
| Outer diameter (mm) | 114.306.35、7.37 | 139.70 | 168.28 | 177.80 | 244.48 |
| Common wall thickness (mm) | 6.35、7.37 | 7.72、9.17 | 8.94、10.59 | 9.19、10.36 | 8.94、11.05 |
| Pipeline Pipe (Oil and Gas Transportation) GB/T 9711-2023 |
| Steel grades: L245, L360, X52, X60 |
| Outer diameter (mm) | 60.3 | 88.9 | 114.3 | 168.3 | 219.1 | 273.1 | 323.9 |
| Common wall thickness (mm) | 4.0、4.8 | 4.0、5.5 | 4.5、6.0 | 6.0、7.1 | 6.0、7.1、8.0 | 6.3、7.1、8.0 | 7.1、8.0、10.0 |
Optional tolerance range |
| Tolerance control | Optional manufacturing process |
| Tolerance ≤ 0.05 mm | Cold rolling |
| Tolerance ≤ 0.10 mm | Cold rolling |
| Tolerance ≤ 0.30 mm | Cold drawing | Cold rolling |
| Tolerance ≤ 0.50 mm | Cold drawing | Hot rolling |
| Tolerance ≤ 1.00 mm | Hot rolling | Hot expanding |
| Hot rolled petroleum cracking pipe GB/T 9948-2025 |
| Outer diameter D (mm) | ≤50 | 50‑159 | ＞159 |
| Outer diameter deviation（mm） | ±0.50 | ±1.0%×D | ±1.25%×D+12.5%S /‑10%S |
| Wall thickness deviation | +15%S /‑10%S | +15%S /‑10%S | +12.5%S /‑10%S |
| Cold drawn petroleum cracking tube |
| Outer diameter D (mm) | ≤30 | 30‑50 | ＞50 |
| Outer diameter deviation（mm） | ±0.20 | ±0.30 | ±0.8%×D |
| Wall thickness deviation | +12%S /‑10%S | +12%S /‑10%S | ±10%S |
| Oil well tubing/casing GB/T 19830-2023 (J55/N80/P110) |
| Project | Outer diameter | Wall thickness |
| Tolerance | ± 0.75% × D | +15% S/-12.5% S |
| Oil and gas transmission pipeline pipes GB/T 9711-2023 |
| Project | Outer diameter (D ＜ 508mm) | Wall thickness |
| Tolerance | ± 0.75% × D | -12.5% S~+15% S |
| General tolerances for form and position |
| Project | Ovalness | Straightness (S ≤ 15mm) |
| Indicator | ≤ 80% outer diameter tolerance | ≤1.5 mm/m |
| S=nominal wall thickness, D=nominal outer diameter |
Optional delivery status
|
| 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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