The P650 grade is a special non-mag, austenitic Mn-Cr-Mo-N steel with high pitting corrosion resistance, specifically developed for oilfield applications. The high manganese, chromium, molybdenum, and nitrogen contents are critical for austenitic stability, ensuring the material remains fully non-magnetic even after severe cold working. The low carbon content (max 0.06%) minimizes carbide precipitation, directly enhancing intergranular corrosion resistance. For applications requiring similar austenitic stability across different well conditions, visit our non magnetic steel product section.
As a specialized single-source manufacturer, ShunFu Metal excels in producing the P650 Non Magnetic Drill Collar tailored for demanding directional drilling applications. Only products that successfully pass our rigorous inspection controls are allowed to leave our facility. From the sourcing of raw materials to final quality control, all ShunFu manufactured products undergo precision machining production steps. These steps include BTA boring, CNC lathe and milling, roller burnishing, shot peening, long-distance gunhole-drilling, and laser cladding at a 6-axis machine.
Our reputation in manufacturing and supplying non magnetic drill string components is built upon extensive in-house experience in both metallurgy and precision manufacturing. ShunFu has consistently led the development of non magnetic materials, special manufacturing processes, and testing procedures, such as hammer peening and hot-spot testing. This comprehensive capability ensures full traceability and stringent control over every production stage of the P650 Non Magnetic Drill Collar, reducing supply chain risks and guaranteeing field reliability.
By focusing specifically on the manufacturing of nonmagnetic drill string components, ShunFu has become an industry leader in complex precision machining and service at the highest of standards. Explore our full range of solutions for the drill collar category to find the right fit for your bottom hole assembly.
Material Advantages and Chemical Composition
ShunFu drill collars are made from high purity austenitic stainless steel. Low and high yield material options are available to match diverse operational requirements. An advanced chemical composition control system combined with a special forging process guarantees the excellent mechanical properties, corrosion resistant performance, and high fatigue resistance of our non magnetic material. Shot peening is standard on all connections to enhance fatigue life.
| Element | P650 Composition |
|---|---|
| Carbon | max. 0.06 |
| Manganese | 19.50-20.50 |
| Chromium | 18.00-19.00 |
| Molybdenum | 1.70-2.00 |
| Nitrogen | 3.00-4.50 |
| Nickel | 0.55-0.65 |
Mechanical and Magnetic Properties
The following mechanical properties, tested at room temperature, are achieved by a special cold-working process over the full length of the collar. This process ensures uniform properties across the cross-section, which is vital for withstanding the immense torsional and bending stresses encountered during drilling operations. The P650 Non Magnetic Drill Collar maintains a relative magnetic permeability of less than 1.005, eliminating magnetic interference with MWD tools. To see how these components integrate with other drill string elements, visit our drill pipe offerings.
| Property | Specification / OD Range | ksi Value | N/mm² Value |
|---|---|---|---|
| Yield Strength (min.) | OD up to 9 1/4″ (0.2% offset) | 140 ksi | 965 N/mm² |
| Yield Strength (min.) | OD 9 1/2″ and larger (0.2% offset) | 130 ksi | 900 N/mm² |
| Tensile Strength (min.) | All ODs | 150 ksi | 1035 N/mm² |
| Elongation (min.) | All ODs | 20% | 20% |
| Reduction of Area (min.) | All ODs | 50% | 50% |
| Impact Energy (min.) | All ODs | 60 ft.lb | 82 J |
| Endurance Strength (min.) | N=10⁵ | 60 ksi | 414 N/mm² |
| Hardness Brinell | All ODs | 330-430 HB | 330-430 HB |
| Property | Value |
|---|---|
| Relative Permeability | < 1.005 |
Corrosion Resistance and Non-Destructive Testing
Transgranular SCC is actively prevented by specialized surface treatments, including hammer peening, roller burnishing, and shot peening. These processes induce a deep compressive residual stress layer on the connections, inhibiting crack initiation. Intergranular SCC is mitigated by preventing material sensitization; this is achieved through a strict quenching procedure immediately after warm-forging. Each P650 Non Magnetic Drill Collar is tested according to ASTM A 262, Practice A and E (latest edition), to verify intergranular corrosion resistance.
Pitting corrosion resistance is inherently high due to the substantial chromium, molybdenum, and nitrogen contents. For highly corrosive sour gas environments that require additional alloying safeguards, review our dedicated CRA piping solutions.
Non-Destructive Testing Protocols
Ensuring structural integrity and magnetic uniformity is paramount. ShunFu enforces strict non-destructive testing on every collar:
- Magnetic Inspection: Drill collars are 100% tested using a proprietary probe-testing process with a Forster Magnetomat 1.782 (the “Hot Spot” test). The magnetic permeability of each collar is certified with a printout from this probe-testing, ensuring no local magnetic anomalies exist.
- Ultrasonic Inspection: Each collar undergoes ultrasonic inspection over 100% of its volume according to ASTM E 114 (latest edition) as a minimum standard, guaranteeing internal soundness.
P650 Non-Mag Drill Collars meet all requirements of API Spec. 7.1 (latest edition). All structural and material tests are carried out according to ASTM Standards (latest editions).
Comprehensive Services and Quality Assurance
Our exclusive focus on nonmagnetic drill string components makes ShunFu a leader in complex precision machining and high-standard service delivery. We provide multiple service tiers to support operational efficiency:
Technical Assistance
Expert technical assistance in the manufacturability and design of complex machined collars, ensuring your specific bottom hole assembly requirements are met.
Warehousing
Stocking and immediate sales of standard high-strength API Spec 7 nonmagnetic drill collars, reducing wait times for urgent operational needs.
Custom Cutting
Stocking and sales of solid P530, P550, P580, and P750 NM material cut to exact length at customer request, providing flexibility for bespoke drilling configurations.
Quality Assurance System
All ShunFu products are manufactured under the full control of a Quality Assurance System that is continually audited and complies with ISO 9001 standards. ShunFu operates a state-of-the-art laboratory where all materials testing is rigorously executed. Our extensive additional facilities guarantee that products deliver the highest quality and performance consistency. To learn more about our corporate standards and manufacturing pedigree, please visit the about ShunFu Metal page.
Request a Quote for the P650 Non Magnetic Drill Collar
Ready to enhance your directional drilling performance with industry-leading metallurgy and certified non-magnetic properties? Contact ShunFu Metal today for custom pricing, technical specifications, and lead times on the P650 Non Magnetic Drill Collar. Our engineering team is prepared to assist you with selection and custom machining requirements.
Frequently Asked Questions
How does the P650 Non Magnetic Drill Collar prevent magnetic interference?
The P650 collar is manufactured from austenitic Mn-Cr-Mo-N steel with a relative magnetic permeability of less than 1.005. Each collar undergoes 100% magnetic inspection using a Forster Magnetomat to certify its non-magnetic properties, ensuring zero interference with MWD tools.
What standards does the P650 Non Magnetic Drill Collar comply with?
P650 collars meet all requirements of API Spec 7.1. They undergo intergranular corrosion testing per ASTM A262, ultrasonic volume inspection per ASTM E114, and magnetic ‘Hot Spot’ testing, all under an ISO 9001 Quality Assurance System.
What are the yield strength specifications for the P650 collar?
Achieved through a special cold-working process, the minimum yield strength is 140 ksi (965 N/mm²) for outer diameters up to 9 1/4 inches, and 130 ksi (900 N/mm²) for outer diameters of 9 1/2 inches and larger. Minimum tensile strength is 150 ksi (1035 N/mm²).
What custom manufacturing services are available for P650 collars?
ShunFu provides in-house precision machining including BTA boring, CNC turning, roller burnishing, and laser cladding. We also offer custom cutting services for solid P530, P550, P580, and P750 NM materials cut to specific customer lengths.
Need P650 Non Magnetic Drill Collar to the specification above?
Send the size, condition, quantity and any NACE or PMI requirements — we reply with mill availability, lead time and a priced offer, usually within one working day.