Project Description
P550 Nonmagnetic Steel
We produce P550 non-mag material Steel Bars and Non Magnetic Hollow Bars.
1. CHEMICAL COMPOSITION
P550 is a special nonmagnetic, austenitic Mn-Cr-steel with a high nitrogen content.
| C | Mn | Cr | Mo | N | Ni |
| max. 0,06 | 20,50 – 21,60 | 18,30 – 20,00 | min. 0,50 | min. 0,60 | min. 1,40 |
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.): | ± 80 ksi | ± 550 N/mm² | |
| Hardness Brinell: (min.): | 335-450 HB | 335-450 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, Prat.A and E, last edition.
- Pitting Corrosion:Due to a high chromium- and nitrogen content 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.
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
