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P690 Non Magnetic Drill Collar

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P690 Non Magnetic Drill Collar2026-04-21T06:58:10+00:00

Project Description

P690 Non Magnetic Drill Collar Overview

P690 non magnetic drill collar solid round bar
P690 non magnetic drill collar material ensuring accurate MWD data

P690 is a high pitting corrosion resistant non-magnetic, austenitic Cr-Ni-Mo-N steel, specifically developed for rigorous oilfield environments. As a premier grade among high strength non magnetic stainless steel collars, it leverages an advanced chemical composition control system combined with a specialized forging process. This metallurgical synergy guarantees excellent mechanical properties, superior corrosion resistant performance, and high fatigue resistance. For directional drilling operations where magnetic interference must be strictly eliminated, the P690 non magnetic drill collar serves as the foundational material for reliable downhole components.

Its low relative permeability (less than 1.001) ensures accurate Measurement While Drilling (MWD) data, making it an indispensable austenitic stainless steel drilling material for complex well trajectories. Whether you are sourcing standard drill collar products or specialized non-magnetic steel solutions, P690 provides the structural integrity required for demanding applications.

Equivalent Grades for P690 Austenitic Steel
Grade Name Standard / System Equivalent Designation
P690 Proprietary Oilfield Grade P690 Non-Magnetic Austenitic Steel

Note: P690 is a proprietary designation; no direct international equivalent grades are published within standard ASTM/DIN/EN catalogues for this exact Cr-Ni-Mo-N specification.

Applications of P690 Non Magnetic Drill Collar

The P690 non magnetic drill collar is engineered for precise downstream products in demanding drilling scenarios. Its reliable austenitic structure prevents magnetic distortion, safeguarding sensitive downhole electronics. Key applications include:

  • Slick non magnetic drill collar for MWD tools: Ensures zero magnetic distortion for downhole sensor housings.
  • MWD housing drill collar & LWD non magnetic components: Structural enclosures protecting sensitive directional and logging electronics.
  • Spiral non mag drill collar weight on bit: Reduces differential sticking while maintaining necessary bottomhole assembly weight.
  • Flex non magnetic drill collar directional drilling: Facilitates high-angle and extended-reach well trajectories.
  • Non magnetic drill pipe: Transition string components isolating magnetic interference from the upper drill pipe transition string.
  • Custom non mag drill collars order: Tailored lengths and diameters for specialized bottomhole assemblies (BHA).
  • Mining & Rock Drilling: Heavy-duty non-magnetic stabilizers and drilling jars for rigorous excavation environments.

Specifications & Available Sizes

Industry Standards

P690 Non-Mag Drill Collars meet all rigorous requirements of the following standard:

  • API Spec 7-1 (Latest edition): Governs the manufacturing, dimensioning, and quality of rotary drill stem elements, specifically covering drill collars and API drill collar connections.
  • Applicable Product Shapes: Solid round bars, hollow bars (for MWD/LWD housings), and finished machined drill collars.

Available Sizes & Delivery Terms

ShunFu Metal supplies P690 across a broad size spectrum to accommodate diverse downhole requirements, ensuring flexible procurement for global operators.

  • Forged Round Bars & Hollow Bars: OD from 3 inches to 12 inches (76mm to 305mm), accommodating various BHA configurations.
  • Rolled Round Bars: Available for standard collar dimensions.
  • Precision Machining Capabilities: Equipped with API-standard calibrated heat treatment furnaces, BTA deep hole boring machines, CNC lathes & milling centers, and long distance gunhole drilling equipment to deliver finished collars from raw forgings.

Delivery and minimum order quantity (MOQ) terms are structured for maximum convenience:

  • Ready Stock (Common Sizes): Single-piece MOQ available; delivery within approximately 7 days.
  • Custom Forgings/Rolled Material: MOQ of 3 tons; delivery within approximately 30 days.
  • Small Batch Special Grades: Induction furnace melting available with a 3–5 ton minimum per heat.
  • Large Volume Orders: 30–60 ton Electric Arc Furnace (EAF) capacity ensuring rapid mass delivery.

Chemical Composition & Melting Process

P690 Chemical Composition

Chemical Composition Limits for P690 Non-Magnetic Steel
Element P690 Content Range
Carbon max. 0.05
Manganese 3.00 - 8.00
Chromium 22.00 - 28.00
Molybdenum 3.00 - 5.00
Nitrogen 14.00 - 18.00
Nickel MIN. 0.40

Melting & Processing Routes

ShunFu Metal offers flexible melting routes for the non magnetic drill collar manufacturing process, allowing clients to negotiate the optimal route based on application severity. Standard production utilizes EAF + AOD + LF + VD to achieve high-purity austenitic stainless steel. For elevated requirements, ESR or PESR (Electro-Slag Remelting) further refines structural homogeneity. For the most demanding downhole conditions, the ultimate VIM + VAR (Vacuum Induction Melting + Vacuum Arc Remelting) route is available, guaranteeing ultra-low inclusion content and maximized fatigue life.

Mechanical & Physical Properties

When evaluating the P690 non magnetic drill collar for high-stress downhole applications, its mechanical integrity is paramount. The following properties are tested at room temperature, achieved by a special cold-working process over the full length of the collar.

Mechanical Properties of P690 Non-Magnetic Drill Collar
Property OD up to 9 1/4" OD 9 1/2" and larger General Minimum
Yield Strength (0.2% offset) 150 ksi (1035 N/mm²) 140 ksi (965 N/mm²) -
Tensile Strength - - 160 ksi (1104 N/mm²)
Elongation - - 20%
Reduction of Area - - 50%
Impact Energy - - 120 ft.lb (162 J)
Endurance Strength (N=10⁵) - - ± 90 ksi (± 550 N/mm²)
Hardness (Brinell) - - 350 - 450 HB
Relative Permeability - - < 1.001

Mandatory Heat Treatment Requirements

To prevent material sensitization and intergranular stress corrosion cracking, a mandatory thermal process is applied immediately after warm-forging. This prevents carbide precipitation and ensures long-term downhole reliability.

Heat Treatment Process for P690 Collars
Process Temperature Range Hold Time Cooling Method Purpose
Quenching after Warm-Forging Solution annealing range Per section thickness Rapid Water Quench Prevent carbide precipitation / sensitization

Surface Finish, Machining & Quality Assurance

Precision Machining for Non Mag Drill Collars

ShunFu provides comprehensive surface treatments to enhance the fatigue life and dimensional accuracy of P690 collars. Precision machining for non mag drill collars includes CNC turning and milling for connection threads, achieving strict API tolerances. Internal bores are processed via BTA deep hole boring and long-distance gunhole drilling, followed by roller burnishing drill collars to achieve an internal surface roughness of Ra ≤ 0.8 µm. External surfaces undergo shot peening or hammer peening to induce compressive residual stress, preventing transgranular SCC. For extreme wear zones, laser cladding non magnetic drill collars at a 6-axis station is available. Final outer surface tolerances can be held within ±0.05mm via precision grinding.

Quality Assurance & Inspection

Under our API Q1 and ISO 9001 certified systems, ShunFu executes rigorous pre-, mid-, and post-production QA. Each collar undergoes 100% volumetric ultrasonic inspection per ASTM E 114. Magnetic validation is executed via proprietary hot-spot testing non mag procedures using a Forster Magnetomat 1.782, certifying permeability printouts. Intergranular corrosion resistance is verified per ASTM A262 (Practice A & E). Standard documentation includes EN 10204 3.1 certificates; 3.2 certifications are available upon request. Third-party inspection by SGS or TÜV can be seamlessly coordinated. To learn about ShunFu Metal's manufacturing capabilities and quality commitments, visit our official site.

Packing & Shipping

Black skin (as-forged) products are securely fixed with steel wire bundling to prevent container shifting during transit. For bright surfaces and precision CNC machined collars, multiple protective wrapping materials—including VCI anti-corrosion paper and custom wooden crating—are utilized to safeguard surface roughness and dimensional tolerances. All shipments receive a comprehensive anti-rust oil coating, ensuring absolute protection against oxidation throughout international sea freight.

Request a Quote for P690 Non Magnetic Drill Collar

Enhance your directional drilling accuracy with our premium P690 non magnetic drill collar. Available from ready stock or custom-forged to your exact BHA specifications, our products guarantee <1.001 permeability and uncompromising fatigue resistance. Contact our engineering team today to discuss your specific downhole requirements.

Request a Quote
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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