P650 Nonmagnetic Steel
P650 Nonmagnetic Steel
We produce P650 non-mag material Steel Bars and Non Magnetic Hollow Bars.
1. CHEMICAL COMPOSITION
P650 is a special nonmagnetic, austenitic Mn-Cr-Mo-N-steel with a high pitting corrosion resistance, specifically developed for oilfield applications.
| C | Mn | Cr | Mo | N | Ni |
| max. 0,06 | 19,50 – 20,50 | 18,00 – 19,00 | 1,70 – 2,00 | 0,55 – 0,65 | 3,00 – 4,50 |
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 up to 9 1/4“ | 140 ksi | 965 N/mm² |
| OD 9 1/2“ and larger | 130 ksi | 900 N/mm² | |
| Tensile Strength (min.): | 150 ksi | 1035 N/mm² | |
| Elongation (min.): | 20% | 20% | |
| Reduction of area (min.): | 50% | 50% | |
| Impact energy (min.): | 60 ft.lb | 82 J | |
| Endurance Strength / N=10⁵ (min.): | 60 ksi | 414 N/mm² | |
| Hardness Brinell: (min.): | 330-430 HB | 330-430 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-, molybdenum- and nitrogen contents 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. 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.
