No-magnetic sub
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The non-magnetic drill collar is made of a low-carbon high-chromium manganese alloy steel. It is refined after strict chemical composition ratio and achieved its mechanical properties through forging. It has good low magnetic permeability and high strength. Mechanical properties, excellent intergranular corrosion cracking resistance and excellent wear resistance. When the magnetic field strength is 1 × 105/4πA/m, the relative permeability μr of the non-magnetic drill collar is less than or equal to 1.010.
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