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API Oil and Gas Non-magnetic/Drill Rod/Spiral Drill Collar in Oil Pipe Drilling Equipment/Trade assurance
Drill collar is basic component which provides weight on the bit for drilling and keeps the drill sting in tension. Drill collar is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.
Material AISI 4145H, 4145HMod, Non-Magnetic Drill Collar
OD+4mm |
Connection |
ID+1.59mm |
Length±152.4mm |
Chamfering Diameter ±0.4mm |
Length of one spiral ±25.4mm |
79.4 |
NC23 |
31.8 |
9140 or 9450 |
76.2 |
679 |
88.9 |
NC26 |
38.1 |
9140 or 9450 |
82.9 |
679 |
104.8 |
NC31 |
50.8 |
9140 or 9450 |
100.4 |
914 |
114.3 |
NC31 |
50.8 |
9140 or 9450 |
100.4 |
914 |
120.6 |
NC35 |
50.8 |
9140 or 9450 |
114.7 |
965 |
127 |
NC38 |
57.2 |
9140 or 9450 |
121 |
965 |
139.7 |
NC40 |
57.2 |
9140 or 9450 |
132.2 |
1067 |
158.8 |
NC46 |
71.4 |
9140 or 9450 |
144.5 |
1067 |
168.3 |
NC50 |
71.4 |
9140 or 9450 |
154.8 |
1168 |
177.8 |
NC50 |
71.4 |
9140 or 9450 |
164.7 |
1168 |
196.8 |
NC50/NC56 |
71.4 |
9140 or 9450 |
185.3 |
1626 |
203.2 |
NC56/6 5/8REG |
71.4 |
9140 or 9450 |
190.1 |
1727 |
209.6 |
6 5/8REG |
71.4 |
9140 or 9450 |
195.6 |
1727 |
215.9 |
6 5/8REG |
71.4 |
9140 or 9450 |
195.6 |
1727 |
228.6 |
6 5/8REG |
71.4 |
9140 or 9450 |
212.7 |
1829 |
241.3 |
7 5/8REG |
76.2 |
9140 or 9450 |
223.8 |
1829 |
254 |
7 5/8REG/8 5/8REG |
76.2 |
9140 or 9450 |
237.3 |
1930 |
279.4 |
8 5/8REG |
76.2 |
9140v9450 |
266.7 |
2032 |
Non-Magnetic Drill Collar Mechanical Property
Fishing Neck OD |
Yield Strength Rf(MPa) |
Tensile Strength Rm(MPa) |
Elongation Ali(%) |
Reduction of Area (%) |
Impact Value (Joule) |
Hardness HB |
3 1/2”-6 7/8” |
≥758 |
≥827 |
≥18 |
≥45 |
≥81J(RT) |
285~341 |
7”-11” |
≥689 |
≥758 |
≥20 |
≥45 |
≥81J(RT) |
285~341 |
* relative permeability: μ(Gauss/Oersted)<1.010
* magnetic fieldgradient: Max. Deviation of the Magnetic field in the inner hole to uniform magnetic field: ≤±0.05μT
* intergranular corrosion(Anti corrosion): as per ASTM A262E for intergranular corrosion test.
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