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P650 Non Magnetic Drill Collar

Home/Non Magnetic Drill Collar, Product/P650 Non Magnetic Drill Collar
P650 Non Magnetic Drill Collar2026-04-21T07:03:13+00:00

Project Description

Overview of the P650 Non Magnetic Drill Collar

P650 Non Magnetic Drill Collar made of austenitic stainless steel for directional drilling
P650 Non Magnetic Drill Collar for precise MWD directional drilling operations

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.

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.

Chemical Composition of P650 Austenitic Steel (Weight Percent)
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.

Mechanical Properties of P650 Non Magnetic Drill Collar (Room Temperature)
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
Magnetic Permeability Specification
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.

Request a Quote Download Datasheet
ShunFu Metal Co., Ltd. is one of the largest high quality oilfields product manufacturers in China, and its products cover various oilfields such as gas pipe, oil casing, tubing, anti-corrosion line pipe, corrosion resistance alloy pipe, etc. …
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