Casing Pipe (for Oil and Gas Extraction)
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Carbon steel made seamless casing pipe is used for extraction of petroleum and natural gas from oil wells.
Tolerance| Item | Tolerance | |
| Outer Diameter | Pipe Body | D≤101.6mm -0.79mm |
| D≥114.3mm 1.0%D-5%D | ||
| Coupling | -1%D | |
| Thickness | 0-12.5%t | |
| Weight | Single Size | 6.5%-3.5% |
| Batch Size | 0-1.75% | |
Mechanical Properties
| Steel Grade | Yield Strength | Tensile Strength | Hardness | Hardness Range | |||||
| Min | Max | Min | Max | ||||||
| Psi | Mpa | Psi | Mpa | Psi | Mpa | Hrc | Bhn | Hrc | |
| J55 | 55,000 | 379 | 80,000 | 552 | 75,000 | 517 | - | - | - |
| K55 | 55,000 | 379 | 80,000 | 552 | 95,000 | 655 | - | - | - |
| N80 | 80,000 | 552 | 80,000 | 758 | 100,000 | 689 | - | - | - |
Chemical Composition
| Steel Grade | Chemical Composition (%) | |||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | V | Als | |
| J55/K55 (37Mn5) | 0.34-0.39 | 0.20- 0.35 | 1.25- 1.50 | ≤ 0.02 | ≤ 0.015 | ≤ 0.15 | ≤ 0.20 | ≤ 0.20 | ≤ 0.02 | |
| N80 (36Mn2V) | 0.34- 0.38 | 0.25- 0.40 | 1.45- 1.70 | ≤ 0.02 | ≤ 0.015 | ≤ 0.15 | ≤ 0.20 | ≤ 0.20 | 0.11- 0.16 | ≤ 0.02 |
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