Data sheet P 750 HS
Revision 2
1. CHEMICAL COMPOSITION
„P750 HS“ is a high pitting corrosion resistant nonmagnetic, austenitic Cr-Ni-N-steel, specifi- cally developed for oilfield applications.
C | Mn | Cr | Mo | N | Ni |
---|---|---|---|---|---|
max. 0,03 | 1,50 - 3,00 | 26,50 - 29,50 | 2,00 - 4,00 | min. 0,20 | 28,00 - 31,50 |
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:
text | od | ksi | N/mm |
---|---|---|---|
Yield Strength (min.) 0,2%-offset method: | OD max. 91/2“ | 160 ksi | 1104 N/mm² |
Tensile Strength (min.): | 165 ksi | 1139 N/mm² | |
Elongation (min.): | 10% | 10% | |
Reduction of area (min.): | 50% | 50% | |
Impact energy (min.): | 80 ft.lb | 110 J | |
Endurance Strength / N=10⁵ (min.): | ± 80 ksi | ± 550 N/mm² | |
Hardness Brinell: (min.): | 300-420 HB | 300-420 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.
• Pitting Corrosion: Due to a high chromium-, nickel- and nitrogen contents a excellent resistance to pitting corrosion comparable to nickelbase alloys 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.
P750 HS 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