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 Petrol boring tool >> non_magnetic drill collars >> Non-magnetic drill collars  

Materials of the Non-magnetic drill collars are from chrome manganese, low carbon alloy 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.

magnetic permeability (when MPS=1 105/4Nm)
relative max:1.010 average: Ur >=1.005

magnetic field gradient (hot spots)
max: B 0.05micro tesla/100mm

The non-magnetic drill collars exhibit the mechanical properties indicated below along their entire length. The table is derived from test samples of steel taken from a point 1± below the surface.

 

Mechanical Property

OD

Yield strength Ò0.2

Tensile strength Òb

Elongation4 (%)

mm

in

79.4--171.4

3 1/8--6 3/4

758

827

18

177.8--279.4

7--11

689

758

20

 

Count:626  AddDate:2008-5-4 【Print】 【Back  
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