Non-mag Drill Collar P650
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.
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
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.