Data sheet P 550

Revision 8

1. CHEMICAL COMPOSITION

„P550“ is a special nonmagnetic, austenitic Mn-Cr-steel with a high nitrogen content.

CMnCrMoNNi
max. 0,0620,50 - 21,6018,30 - 20,00min. 0,50min. 0,60min. 1,40

2. MECHANICAL PROPERTIES

Following mechanical properties (tested at room temperature) are achieved by a special cold-working process over the full length of the collar:

textodksiN/mm
Yield Strength (min.) 0,2%-offset method:OD up to 9 1/4“140 ksi965 N/mm²
OD 9 1/2“ and larger130 ksi900 N/mm²
Tensile Strength (min.):150 ksi1035 N/mm²
Elongation (min.):20%20%
Reduction of area (min.):50%50%
Impact energy (min.):60 ft.lb82 J
Endurance Strength / N=10⁵ (min.):± 80 ksi± 550 N/mm²
Hardness Brinell: (min.):350-430 HB350-430 HB

3. MAGNETIC PROPERTIES

Relative permeability: ≤ 1,005.

4. 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 warmforging. Each collar is tested according to ASTM A 262, Pract.A and E, last edition.

Pitting Corrosion: Due to a high chromium- and nitrogen content a high resistance to pitting corrosion is given.

5. NON-DESTRUCTIVE TESTING

Magnetic inspection: Drill collars are 100% tested by a proprietary probe-testing process using a Förster 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.

P550 Non-Magnetic Drill Collars meet all requirements of API Spec. 7.1, last edition. All tests are carried out according to ASTM-Standards, last editions.
Prepared / released: B. Holper
Date: June, 2013