N850 Nonmagnetic Steel
N850 Nonmagnetic Steel
We produce N850, Hastelloy C-22HS, non-mag material Steel Bars and Non Magnetic Hollow Bars.
1. CHEMICAL COMPOSITION
N850 is a special nonmagnetic, nickel chromium molybdenum alloy.
| C | Cr | Mo | Fe | Co | Ni |
| max. 0,01 | 20,00 – 22,00 | 15,00 – 18,00 | max. 2,0 | max. 1,0 | remainder |
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 10“ | 150 ksi | 1035 N/mm² |
| Tensile Strength (min.): | 160 ksi | 1104 N/mm² | |
| Elongation (min.): | 15% | 15% | |
| Reduction of area (min.): | 50% | 50% | |
| Impact energy (min.): | 100 ft.lb | 135 J | |
| Endurance Strength / N=10⁵ (min.): | ± 90 ksi | ± 620 N/mm² | |
| Hardness Brinell: (min.): | 300-430 HB | 300-430 HB |
3. MAGNETIC PROPERTIES
Relative permeability: ≤ 1,005.
4. CORROSION RESISTANCE
Superior corrosion properties compared to other Ni-based alloys are given.
The material specified conforms to ANSI/NACE MR0175 / ISO 15156.
This alloy can be used in environments containing 1000 psia (7000 kPa) H2S at a chloride concentration of 180000 mg/L and any in situ pH up to 550°F (288°C). It can be used also in environments containing 500 psia (3500 kPa) H2S at a chloride concentration of 180000 mg/L, at any situ pH and in the presence of elemental sulfur up to 400°F (204° C)
5. NON-DESTRUCTIVE TESTING
- Magnetic inspection:Drill collars are 100% tested by a proprietary probe-testing process.
- Ultrasonic inspection: Each collar is ultrasonically inspected over 100% of the volume according to ASTM E 114, last edition as a minimum level.
