Drill pipes
are manufactured from upset pipe body ends and friction welded on tool joints. Tool joints are forged from chromium molybdenum alloy steel and uniformly quenched and tempered to obtain API Spec.7-1 properties. Pipe body standard grades, covered by API Spec. 5DP/ISO 11961 are: Grade E and High-strength grades X, G and S The type of upset are: EU, IU,IEU Tool Joint s are weld to the pipe body by friction welding. After welding, an area wider than the weld zone to tempering temperature. Each weld is 100% inspected according to API Spec. 5DP. Drill pipes are also provided with internal coating and the different types of box tool joint hardbanding.
Mechanical Properties of Tool JointYield Strength psi | Tensile Strength Psi | Elongation % | Charpy V Impact ft-lb | Brinell Hardness | |
Min. | Max. | Min. | Min. | Min. (700F) | Min. |
120,000 | 165,000 | 140,000 | 13 | 40 average | 285 HB |
Mechanical properties of pipe body
Grade | Yield Strength psi | Tensile Strength Psi | Elongation % | Charpy V Impact ft-lb | |
| Min. | Max. | Min. | Min. | Min. (700F) |
Grade E | 75 000 | 105 000 | 100 000 | a | 40 average |
Grade X | 95 000 | 125 000 | 105 000 | a | 40 average |
Grade G | 105 000 | 135 000 | 115 000 | a | 40 average |
Grade S | 135 000 | 165 000 | 145 000 | a | 40 average |