Non-magnetic drill collars

Materials of the Non-magnetic drill collars 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.

Magnetic permeability (when MPS=1105/4Nm) relative max μr: 1. 010. Magnetic field gradient (hot spots)

max: B 0. 05micro tesla/100mm.