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Data sheet P 670
Revision 1
1. CHEMICAL COMPOSITION
„P670“ is a special nonmagnetic, austenitic Cr-Ni-Mn -steel with a high nitrogen content.
| C | Mn | Cr | Mo | N | Ni |
|---|---|---|---|---|---|
| max. 0,06 | 19,50 - 22,00 | 19,50 - 22,00 | min. 2,20 | min. 0,60 | 8,50 - 10,00 |
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:
| text | od | ksi | N/mm |
|---|---|---|---|
| Yield Strength (min.) 0,2%-offset method: | OD up to 9 1/4“ | 160 ksi | 1103 N/mm² |
| OD 9 1/2“ and larger | 150 ksi | 1034 N/mm² | |
| Tensile Strength (min.): | 170 ksi | 1172 N/mm² | |
| Elongation (min.): | 20% | 20% | |
| Reduction of area (min.): | 50% | 50% | |
| Impact energy (min.): | 80 ft.lb | 108 J | |
| Endurance Strength / N=10⁵ (min.): | ± 80 ksi | ± 550 N/mm² | |
| Hardness Brinell: (min.): | 350-450 HB | 350-450 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- and nitrogen content a resistance to pitting corrosion 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.
Prepared / released:
Date: June, 2013