P750 Nonmagnetic Steel
P750 Nonmagnetic Steel 2
We produce P750 non-mag material Steel Bars and Non Magnetic Hollow Bars.
1. CHEMICAL COMPOSITION
P750 is a high pitting corrosion resistant nonmagnetic, austenitic Cr-Ni-N-steel, specifically 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 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.): | 17% | 17% | |
| Reduction of area (min.): | 50% | 50% | |
| Impact energy (min.): | 100 ft.lb | 135 J | |
| Endurance Strength / N=10⁵ (min.): | ± 80 ksi | ± 550 N/mm² | |
| Hardness Brinell: (min.): | 300-400 HB | 300-400 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 warm forging. Each collar is tested according to ASTM A 262, Prat.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. 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.
