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Materials of TianHe Non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has following characteristic:
The chemical composition should be controlled strictly during the refining and forging process.
With excellent lower Magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking and no tendency to galling.
Mechanical Properties
OD
Size |
Yield Strength
σ0.2
Mpa(psi)
|
Tensile Strength σb
Mpa(psi)
|
Elongation
δ4%
|
Reduction of are
%
|
Impact
Ft.1b
|
|
3 1/8~6 3/4
|
≥758
(110，000)
|
≥827
(120，000)
|
≥18
|
50
|
≥50
|
|
7~10
|
≥689
(100，000)
|
≥758
(110，000)
|
≥20
|
Mechanical properties
TianHe non-magnetic has the listed mechanical properties along its overall length.
Non-magnetic properties
Magnetic permeability (when MPS=1×105/4πNm)
* Relative Max: 1.010
* Average: μr≤1.005
Magnetic Field Gradient (hot spots)
* Max: B ≤ 0.05 micro Tesla/100mm
Types of TianHe Non-magnetic products
Drill Collars
Short Drill Collars
Heavy Wall Drill Pipe
Crossover Subs
Integral spiral Stabilizers
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