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Products description
drill collar are made of AISI 4145H or 4145H modified alloy steel. Its
bores are trepanned from one direction with no mismatch. Drill collars
are available in lengths from 10 to 32 feet and outside diameter from
3-1/8" to 9-1/2".
No-magnetic drill collar 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. |
