1. CHEMICAL COMPOSITION
„P530“ is a special nonmagnetic, austenitic Mn-Cr-N-steel with a Nickel-content of ≤ 2%.
|max. 0,05||18,50 - 20,00||13,00 - 14,00||0,40 - 0,60||0,25 - 0,40||max. 2,00|
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:
|Yield Strength (min.) 0,2%-offset method:||OD less than 4“||120 ksi||830 N/mm²|
|OD 4“ to 91/4“||110 ksi||760 N/mm²|
|OD 91/2“ and larger||100 ksi||690 N/mm²|
|Tensile Strength||OD less than 4“||130 ksi||900 N/mm²|
|OD 4“ and larger||120 ksi||830 N/mm²|
|Reduction of area (min.):||50%||50%|
|Impact energy (min.):||90 ft.lb||122 J|
|Hardness Brinell: (min.):||260-350 HB||260-350 HB|
3. MAGNETIC PROPERTIES
Relative permeability: ≤ 1,001.
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.
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.
6. GALLING RESISTANCE
„P530“ is due to the chemical composition and the special coldworking process less susceptible to galling than Cr-Ni steels.
Non-Magnetic material optimized for MWD-collars and stabilizers (higher strength and endurance) is available on special request.
P530-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