Alleviated Steel Drill Papes with welded connectors are used for geophysical surveys in prospecting and exploration of solid minerals.
Technical characteristics of Alleviated Steel Drill Pipes
| Standard size | Pipe | Connector | Length L, m | Weight, kg | Thread | Torque, Nm (±5%) | |||
|---|---|---|---|---|---|---|---|---|---|
| External diameter D, mm | Wall thickness t, mm | External diameter D1, mm | Internal diameter d, mm | OD of tong recess S, mm | |||||
| ASDP-24 | 24.0 | 2.5 | 24.5 | 9 | 19 | 0.83 | 1.42 | SPK-18 | 100 |
| ASDP-34 | 34.0 | 3.5 | 34.5 | 16 | 27 | 1.00 | 3.29 | SPK-27 | 500 |
| ASDP-43 | 43.0 | 3.5 | 43.5 | 22 | 32 | 1.00 | 4.18 | SPK-34 | 1000 |
| ASDP-43 | 43.0 | 3.5 | 43.5 | 22 | 32 | 1.50 | 5.88 | SPK-34 | 1000 |
| ASDP-43 | 43.0 | 3.5 | 43.5 | 22 | 32 | 3.00 | 11.0 | SPK-34 | 1000 |
| ASDP-55 | 55.0 | 3.5 | 55.5 | 32 | 46 | 1.00 | 5.95 | SPK-45 | 1800 |
| ASDP-55 | 55.0 | 3.5 | 55.5 | 32 | 46 | 1.50 | 8.17 | SPK-45 | 1800 |
| ASDP-55 | 55.0 | 3.5 | 55.5 | 32 | 46 | 3.00 | 14.83 | SPK-45 | 1800 |
| ASDP-55 | 55.0 | 4.5 | 55.5 | 32 | 46 | 4.70 | 27.6 | SPK-45 | 1800 |
Mechanical properties of pipes (at least)
| Parameters | Pipe (steel strength K) | Pipe (steel 45) | Connector (special steel) |
|---|---|---|---|
| Tensile strength, MPa | 686 | 539 | 882 |
| Yield strength, MPa | 490 | 323 | 686 |
| Elongation, % | 12 | 16 | 15 |
| Hardness HRC | – | – | 26 |
Note:
- Mechanical properties of the drill pipe as well as for the weld seam.
- Mechanical properties of connectors indicated after the volumetric heat treatment.
- Surface hardness after heat treatment: pipe – not less 40 HRC, heat treated connector – not less 55 HRC.