Dumb Irons
Our Drill collars
are manufactured from AISI 4145H Mod. chromium molybdenum alloy steel, drill collar bars are full-length uniformly quenched and tempered to obtain API Spec.7-1, NS-1 and DS-1 properties. Mill test certificates including mechanical properties, chemical analysis and nondestructive inspections are supplied with all drill collars. Mill test certificates guarantee conformance to API Spec. 7-1, NS-1, DS-1 and customer requirements. Drill collar bars are trepanned and inside diameters are gauged to API Spec. 7-1 specification with a 10ft drift mandrel. Bar surface finish is hot-rolled and mill-finish for diameter below or equal to 8 ½ and forged and peeled for diameter above 8 ½. Spiral drill collars are grooved to avoid differential pressure sticking in the hole. Slip and elevators recesses are machined in accordance with API Spec.7-1 to improve handling efficiency and safety. Stabilizers
are manufactured from forging single piece of AISI 4145H modified alloy steel, full length quenched and tempered to obtain API Spec. 7-1, NS-1 and DS-1 properties. Ultrasonic inspection and MPI inspections are performed on each forging over its full length and section, after rough machining according to API Spec 7-1, NS-1 and DS-1. Mill test certificates including mechanical properties, chemical analysis and inspections are supplied with all stabilizers.
And Our Non-Magnetic Stabilizers are manufactured from chromium manganese austenitic low carbon alloy obtained by VOD process and high-speed press warm forging process combining chemical analysis and temperature /time cycle to get API Spec. 7-1 properties. Ultrasonic inspection and MPI inspections are performed on each forging over its full length and section, after rough machining according to API Spec 7-1. Mill test certificates including mechanical properties, chemical analysis, magnetic properties and inspections are supplied with all stabilizers. Non-Magnetic Drill Collars Non-Magnetic Flex Collars, Pony Collars and Stabilizers
are produced from Amagnit 501 and Amagnit 601. Amagnit 501 and 601 are chromium manganese austenitic low carbon alloy steels obtained by VOD process, and rotary hammer warm forging process combining chemical analysis and temperature / time cycle. Amagnit 501 and 601 are resistant to stress corrosion cracking with high mechanical properties, low magnetic permeability and no tendency to galling. Ultrasonic inspection and MPI inspections are performed on each forging over its full length and section, after rough machining according to API Spec 7-1. A compressive layer is applied to the bore of the collars to increase the resistance to stress corrosion cracking.