Directional Downhole Drilling Tools, Non-Magnetic Drill Collar,
P530, P110
Tiptop provides excellent Non-Magnetic Drill Collar for Directional
Drilling. Non magnetic material is high purity austenitic stainless
steel. Strict control of chemical composition and special forging
process guarantee the excellent mechanical properties of our non
magnetic drill collar.
Non Magnetic Properties:
Relative Permeability: Max. 1.005
Hot Spot/Field Gradient: Max ±0.05μT
Special Treatment on ID: Roller Burnishing. (after roller
burnishing, a comprehensive layer come into being)
Advantages:
Increase the corrosion resistance properties;
Increase the surface hardness of bore up to HB400;
Increase surface finish of bore to Ra≤3.2μm
Test and inspection carried out on each bar during production :
Chemical Composition;
Tensile Test;
Impact Test;
Hardness Test;
Metallographic Test (Grain Size);
Corrosion Test (According to ASTM A262 Practice E);
Ultrasonic Test over the whole length of the bar (according to ASTM
A388);
Relative magnetic permeability test;
Hot Spot Test;
Dimension Inspection, etc.
Please contact us for your non-magnetic drill collar inquiries.
Specification of non magnetic drill collars:
| Tool Joint | OD
in | Bore d
in
+ 1/16
-0 | Length
ft
+6
-0 | Bevel Diameter
in
±1/64 in | BSR |
| NC23-31 | 3 1/8 | 1 1/4 | 30 | 3 | 2.57:1 |
| NC26-35 | 3 1/2 | 1 1/2 | 30 | 3 17/64 | 2.42:1 |
| NC35-41 | 4 1/8 | 2 | 30 or 31 | 3 61/64 | 2.43:1 |
| NC35-47 | 4 3/4 | 2 | 30 or 31 | 4 33/64 | 2.58:1 |
| NC38-50 | 5 | 2 1/4 | 30 or 31 | 4 49/64 | 2.38:1 |
| NC44-60 | 6 | 2 1/4 | 30 or 31 | 5 11/16 | 2.49:1 |
| NC44-60 | 6 | 2 13/16 | 30 or 31 | 5 11/16 | 2.84:1 |
| NC44-62 | 6 1/4 | 2 1/4 | 30 or 31 | 5 7/8 | 2.91:1 |
| NC46-62 | 6 1/4 | 2 13/16 | 30 or 31 | 5 29/32 | 2.63:1 |
| NC46-65 | 6 1/2 | 2 1/4 | 30 or 31 | 6 3/32 | 2.76:1 |
| NC46-65 | 6 1/2 | 2 13/16 | 30 or 31 | 6 3/32 | 3.05:1 |
| NC46-67 | 6 3/4 | 2 1/4 | 30 or 31 | 6 9/32 | 3.18:1 |
| NC50-70 | 7 | 2 1/4 | 30 or 31 | 6 31/64 | 2.54:1 |
| NC50-70 | 7 | 2 13/16 | 30 or 31 | 6 31/64 | 2.27:1 |
| NC50-72 | 7 1/4 | 2 13/16 | 30 or 31 | 6 43/64 | 3.12:1 |
| NC56-77 | 7 3/4 | 2 13/16 | 30 or 31 | 7 19/64 | 2.70:1 |
| NC56-80 | 8 | 2 13/16 | 30 or 31 | 7 31/64 | 3.02:1 |
| 6 5/8 REG | 8 1/4 | 2 13/16 | 30 or 31 | 7 45/64 | 2.93:1 |
| NC61-90 | 9 | 2 13/16 | 30 or 31 | 8 3/8 | 3.17:1 |
| 7 5/8 REG | 9 1/2 | 3 | 30 or 31 | 8 13/16 | 2.81:1 |
| NC70-97 | 9 3/4 | 3 | 30 or 31 | 9 5/32 | 2.57:1 |
| NC70-100 | 10 | 3 | 30 or 31 | 9 11/32 | 2.81:1 |
| 8 5/8 REG | 11 | 3 | 30 or 31 | 10 1/2 | 2.84:1 |
Mechanical Properties:
| Steel Grade | OD Range
in | Yield Strength
Rt | Tensile Strength
Rm | Elongation
A
(%) | Impact Value
Akv | Hardness Brinell
(HB) |
| Mpa | ksi | Mpa | ksi |
| SLW-1 | 3 1/8 through 6 7/8 | ≥758 | ≥110 | ≥827 | ≥120 | ≥25 | ≥150 longitudinal | 285-360 |
| 7 through 11 | ≥689 | ≥100 |
| SLW-2 | 3 1/8 through 6 7/8 | ≥827 | ≥120 | ≥896 | ≥130 | ≥25 | ≥150 longitudinal | 285-360 |
| 7 through 11 | ≥758 | ≥110 |
| SLW-3 | 3 1/8 through 6 7/8 | ≥765 | ≥140 | ≥1034 | ≥150 | ≥20 | ≥90 longitudinal | 330-400 |
| 7 through 11 | ≥896 | ≥130 |
| SLW-4 | 3 1/8 through 6 7/8 | ≥827 | ≥120 | ≥896 | ≥130 | ≥20 | ≥75 longitudinal | 285-360 |
| 7 through 11 | ≥758 | ≥110 |
