API Standard Non-magnetic Drill Collar
Non-magnetic drill collar
Materials of the Non-magnetic drill collar are from chrome manganese, low carbon obtained by combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling.
Mechanical Property | |||||
O.D. |
Yield strength Rt |
Tensile strength Rm |
Elongation 4(%) |
HB |
|
mm |
In |
||||
79.4~171.4 |
3 1/8--6 3/4 |
≥758 |
≥827 |
≥18 |
285~360 |
177.8~279.4 |
7--11 |
≥689 |
≥758 |
≥20 |
|
ok
required
ok
ok
ok
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