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Non Magnetic Drill Collar

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Non Magnetic Drill Collar2026-04-22T07:38:12+00:00

Project Description

Overview of Non Magnetic Drill Collar

Non Magnetic Drill Collar for MWD and LWD directional drilling applications
ShunFu Metal Non Magnetic Drill Collar

ShunFu Metal manufactures premium Non Magnetic Drill Collars engineered specifically for MWD, LWD, and FEWD applications. Constructed from high-purity austenitic stainless steel, these collars effectively neutralize electromagnetic interference from the drill string. This ensures highly accurate directional surveys in horizontal and directional drilling operations.

Our proprietary high-strength steel alloys—P530, P530 HS, P550, P580, and P750—deliver proven mechanical properties, exceptional fatigue resistance, and superior corrosion performance. The standard P530 grade is enhanced in our P550 and P580 materials through increased chromium and nitrogen content. This provides greater pitting corrosion resistance and endurance strength for demanding well paths.

Furthermore, our advanced P750 grade offers an extraordinary, competitive alternative to common nickel-based alloys. It maintains high yield strength without the premium cost typically associated with high-performance materials. All collars are manufactured to API Spec 7-1. They are fully compatible with standard drill collar string tools and stabilizers.

Equivalent Grades and Trademark Names

ShunFu proprietary grades align with general industry categories and typical equivalent trademark names. This ensures seamless integration into existing drilling programs and clear material specification tracking.

Equivalent Grades for ShunFu Non Magnetic Drill Collar Materials
ShunFu Grade General Industry Category Typical Equivalent Trademark Name
P530 / P530 HS Standard Austenitic Mn-Cr Steel NMS1 / P530 Equivalent
P550 Enhanced Cr-N Austenitic Steel NMS2 / P550 Equivalent
P580 High Cr-N Austenitic Steel NMS3 / P580 Equivalent
P750 High Ni-Cr-Mo Super Austenitic NMS4 / P750 Equivalent

Applications of Non Magnetic Drill Collars

Specific downstream products and application scenarios for ShunFu Non Magnetic Drill Collars cover a broad spectrum of directional drilling requirements. Our materials serve as critical components in modern wellbore navigation and evaluation systems.

  • MWD and LWD tool housings for directional drilling navigation.
  • FEWD sensor collars for real-time formation evaluation.
  • Slick non-mag drill collars for standard directional drilling string assemblies.
  • Spiral non-mag drill collars to reduce differential sticking and improve mud flow.
  • Flex and Pony non-mag drill collars for specialized directional control.
  • Non-magnetic drill pipes with hardbanding for abrasion resistance in extended-reach wells.
  • Stabilizer mandrels in directional and horizontal well drilling.
  • H2S sour gas environment drill string components requiring ID shot peening for stress corrosion prevention.

Specifications and Standards

All ShunFu proprietary grades are manufactured to meet the strict mechanical and dimensional requirements of international standards. Our commitment to compliance guarantees reliability in the field.

Applicable Specifications for ShunFu Drill String Components
Standard Designation Covered Product Shapes
API API Spec 7-1 Drill Collars, Drill Pipes, Stabilizers

Available Sizes and Delivery Options

ShunFu Metal supplies a comprehensive range of sizes for Non Magnetic Drill Collars, demonstrating our advanced hot working and deep-hole processing capabilities. We accommodate standard and custom dimensional requirements.

  • Forged Round Bar and Flat Bar: Outer Diameter from 3 1/2" (88.9mm) up to 11" (279.4mm) and beyond.
  • Hollow Bar / Drill Collar Blanks: Available with precision-machined inner diameters tailored to MWD/LWD tool specifications.

Processing Capabilities

All materials are treated in our API-standard, regularly calibrated heat treatment furnaces. We perform precision machining utilizing BTA deep hole drilling (boring), CNC lathes and milling machines, and long-distance gunhole drilling. This ensures strict concentricity and ID tolerances for every Non Magnetic Drill Collar.

Lead Time and Minimum Order Quantity

  • Common Grades (P530, P550): Ready Stock available; single-piece MOQ; approximately 7 days delivery.
  • Custom Forged/Rolled Collars: MOQ usually 3 tons; approximately 30 days delivery.
  • Small Batch Special Grades: Induction furnace melting available; 3-5 tons MOQ.
  • Large Volume Orders: 30-60 tons EAF melting; fast delivery turnaround.
View Non-Magnetic Steel Products

Chemical Composition

The carefully balanced chemical composition of our alloys ensures the non-magnetic properties, high strength, and corrosion resistance required for downhole environments. Significant compositional shifts from the base P530 grade achieve higher performance.

Chemical Composition of ShunFu Non Magnetic Drill Collar Grades (%)
Element P530 / P530 HS P550 P580 P750 P750I
Carbon max. 0.05 max. 0.06 max. 0.06 max. 0.03 max. 0.03
Manganese 18.50-20.00 20.00-21.60 22.00-24.50 1.50-3.00 1.50-3.00
Chromium 13.00-14.00 18.30-20.00 22.00-24.50 26.50-29.50 26.50-29.50
Molybdenum 0.40-0.60 / min. 0.50 max. 1.50 1.50-3.00 2.00-4.00 2.00-4.00
Nitrogen 0.25-0.40 / min. 0.60 max. 0.75 0.20-0.75 min. 0.20 min. 0.20
Nickel max. 1.50 / min. 2.00 max. 2.50 max. 2.50 28.00-31.50 28.00-31.50

Melting and Processing Routes

ShunFu Metal offers flexible melting routes tailored to customer specifications. Metallurgical purity directly impacts downhole reliability, and we provide multiple avenues to achieve the required material integrity.

  • EAF + AOD + LF + VD: Utilized for standard requirements to ensure high purity for austenitic stainless grades.
  • ESR or PESR: Available for stricter micro-cleanliness and mechanical demands.
  • VIM + VAR (Double Vacuum): Provided for the ultimate performance in critical applications.

Clients can negotiate with our metallurgists to learn about ShunFu Metal and select the optimal cost-performance melting route for their specific project.

Mechanical Properties

Our Non Magnetic Drill Collar grades provide a progressive range of mechanical strengths to match varying downhole stress conditions. From standard directional wells to extreme dogleg severity, ShunFu alloys deliver dependable performance.

Mechanical Properties of ShunFu Non Magnetic Drill Collar Alloys
Property P530 P530 HS P550 P580 P750 P750I*
Yield Min (KSI) 3.5"-6.875" OD 110 120 140 140 140 min. 155
Yield Min (KSI) 7"-11" OD 100 110 130 130 130 min. 155
Tensile (KSI) 3.5"-6.875" OD 120 130 150 150 150 min. 160
Tensile (KSI) 7"-11" OD 120 130 150 150 150 min. 160
Elongation Min % 25 25 20 20 15 10
Reduction of Area Min % 50 50 50 50 50 50
Impact Energy Min (ft-lb) 90 90 60 60 100 80
Hardness (Brinell) 260-350 285-365 300-430 350-450 300-400 300-410
Endurance Min KSI (N=10⁷) - +/-50 +/-60 +/-60 +/-60 -

*P750I applicable only for dimensions up to OD max. 5.5 inches. Sampling: 1" below surface.

Heat Treatment

Proper heat treatment is essential to achieve the target mechanical ranges and microstructure stability for downhole conditions. ShunFu applies industry-standard thermal processes optimized for each proprietary grade.

Heat Treatment Parameters for ShunFu Drill Collars
Heat Treatment Type Temperature Range Holding Time Cooling Method
Solution Annealing Customized per grade Per API Spec 7-1 Water Quench
Stress Relief (Post-Machining) Customized per grade Per specification Air Cool

Exact temperature parameters are optimized per ShunFu proprietary grade to achieve the target mechanical ranges listed above.

Surface Finish and Machining

ShunFu executes comprehensive precision machining for non-magnetic drill string components. External surfaces undergo CNC turning and milling to strict dimensional tolerances. This is followed by roller burnishing and shot peening on connections to enhance fatigue life.

Internally, we utilize BTA boring and long-distance gunhole drilling to achieve precise ID concentricity. We finish with internal shot peening to induce compressive stress and prevent stress corrosion in H2S environments. Laser cladding on 6-axis machines is available for wear pads.

Surface roughness achieves tight Ra values, ensuring compatibility with MWD/LWD tools. This meticulous attention to surface integrity extends the operational lifespan of every Non Magnetic Drill Collar.

Quality Assurance and Inspection

ShunFu operates under an ISO 9001 and API Q1 certified Quality Assurance System. Pre-production involves rigorous chemical composition analysis. During processing, we conduct dimensional checks, metallographic inspections, and in-process UT.

Post-production includes final mechanical testing (yield, tensile, impact, hardness) and full-length Ultrasonic Testing per API standards. We perform specialized hot-spot testing and hammer peening inspections. Material certificates EN 10204 3.1 are standard; 3.2 certificates can be arranged with third-party inspection by SGS or TÜV.

Packing and Shipping

Black-skin and forged collars are securely fastened with steel wire bundling to prevent container damage during transit. For bright-finish and precision-machined drill collars, we apply multiple layers of protective wrapping to preserve surface roughness and dimensional integrity.

All materials are coated with anti-rust oil. This guarantees complete protection against corrosion during maritime shipping, ensuring the Non Magnetic Drill Collar arrives at the rig site in optimal condition.

Request a Quote for Non Magnetic Drill Collars

Ready to source high-performance non-magnetic materials for your next directional drilling project? Our metallurgists and sales engineers are standing by to assist with grade selection, custom sizing, and melting route specifications.

Request a Quote Today
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