Drill Collar
Manufacturing Standard: API Spec. 7-1, NS-1, DS-1 or Customer requirements.
Materials: AISI4145H mod and Non-magnetic P530,P550.
AISI 4145H mod Drill Collar Mechanical Property:
OD Range
(in) | Yield Strength
(MPa) | Tensile Strength (MPa) | Elongation
(%) | Hardness
(HB) | Impact Test
(J) |
3 1/8 ~6 3/4 | ≥758 | ≥965 | ≥13 | 285～341 | ≥54 |
7～11 | ≥689 | ≥930 | ≥13 | 285～341 | ≥54 |
Non-Magnetic(P530) Drill Collar Mechanical Property:
1. Relative permeability: μ(Gauss/Oersted)＜1.010.
2. Magnetic field gradient: Max. Deviation of the Magnetic field in the inner hole to uniform magnetic field: ≤±0.05μT.
3. Intergranular corrosion (Anti corrosion): as per ASTM A262E for intergranular corrosion test.
OD Range
(in) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation
(%) | Reduction of Area (%) | Impact Test AKv (J) | Hardness HB |
3 1/2-6 7/8 | ≥758 | ≥827 | ≥20 | ≥50 | ≥81J | 285～350 |
7～11 | ≥689 | ≥758 | ≥18 | ≥50 | ≥81J | 285～350 |
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