Non-mag Drill Collar P650
Schoeller Bleckmann Oilfield Technology has consistently led the way in developing Non-Mag materials, innovative manufacturing processes, and rigorous testing methods. Their P650, a cutting-edge non-magnetic, austenitic Mn-Cr-Mo-N steel, is engineered to offer exceptional resistance to pitting corrosion, making it particularly suited for demanding oilfield applications.
Chemical Composition
P650 is a special non-mag, austenitic Mn-Cr-Mo-N-steel with a high pitting corrosion resistance, specifically developed for oilfield applications.
Nondestructive Testing
Magnetic inspection: Drill collars are 100% tested by a proprietary probe-testing process using a Forster Magnetomat 1.782. (“Hot Spot”-test). Magnetic permeability of each collar is certified with the printout of probe-testing.
Ultrasonic inspection: Each collar is ultrasonically inspected over 100% of the volume according to ASTM E 114, last edition as a minimum level.
P650 Non-Mag Drill Collars meet all requirements of API Spec. 7.1, last edition. All tests are carried out according to ASTM-Standards, last editions.
Corrosion Resistance
Transgranular SCC: Prevented by special surface treatments (Hammer peening, roller burnishing, shot peening).
Intergranular SCC: The occurrence of material sensitization is prevented by quenching after warm-forging. Each collar is tested according to ASTM A 262, Pract. A and E, last edition.
Pitting Corrosion: Due to a high chromium-, molybdenum- and nitrogen contents a high resistance to pitting corrosion is given.
Magnetic Properties
Relative permeability: < 1,005
Mechanical Properties
Following mechanical properties (tested at room temperature) are achieved by a special cold-working process over the full length of the collar:
OD up to 9 1/4'
0.2%-offset method
OD 9/12" and larger
0.2%-offset method