P750HS Non Magnetic Drill Collar

Introduction to P750HS Non Magnetic Drill Collar

The P750HS non magnetic drill collar represents a pinnacle of metallurgical engineering for the oil and gas sector. It is a high-pitting-corrosion-resistant, austenitic Cr-Ni-N stainless steel specifically developed to withstand the rigorous demands of modern directional drilling. As a premier manufacturer, ShunFu Metal employs an advanced chemical composition control system and a specialized full-length cold-working process. This guarantees exceptional mechanical properties, superior fatigue resistance, and a relative magnetic permeability of less than 1.001.

Designed primarily for MWD and directional drilling applications, this high strength non magnetic steel ensures absolutely zero magnetic interference with downhole surveying instruments. Its robust composition, enriched with high chromium, nickel, molybdenum, and nitrogen contents, delivers pitting corrosion resistance comparable to advanced corrosion resistant alloy piping. By preventing material sensitization through quenching after warm-forging and utilizing specialized surface treatments, the austenitic stainless steel non magnetic drill collar provides uncompromising reliability in extreme drilling environments, including arctic regions and high magnetic field areas.

Primary Applications

The P750HS non magnetic drill collar is purpose-built for critical downhole assemblies where magnetic neutrality and structural integrity are paramount. Its primary use cases span some of the most challenging drilling scenarios globally:

• MWD non magnetic drill collar for precise directional drilling trajectories
• LWD non magnetic collar and sensitive sensor housings
• Non magnetic stabilizers for BHA configuration
• Non magnetic drill string components for extended-reach and deepwater wells
• Heavy-weight drill pipes for deep mining and high-stress drilling engineering
• Custom length non magnetic drill collar for arctic drilling and high magnetic field environments

For operations requiring specialized dimensions beyond standard drill collar specifications, our custom forging capabilities ensure exact compatibility with your bottom hole assembly.

Specifications & Standards

All ShunFu Metal P750HS products strictly adhere to international oilfield standards, ensuring global compliance and operational safety. Our manufacturing and testing processes are governed by the following key specifications:

• API Specification 7.1 – Rotary Drill Stem Elements (covering Drill Collars and Solid Bars)
• ASTM E 114 – Ultrasonic Inspection (NDT Standard for 100% Volume Inspection)
• ASTM A 262, Practice A & E – Intergranular Corrosion Testing (Sensitization Verification)

Available Sizes, Processing & Delivery

ShunFu Metal provides a broad size range of P750HS materials, including hot-rolled and forged round bars, forged flat bars, and hollow bar stock tailored for drill collar manufacturing. We demonstrate comprehensive in-house processing capabilities, utilizing API-standard-calibrated heat treatment furnaces alongside advanced precision machining equipment. Our facility is equipped with BTA deep hole drilling machines, CNC lathes and milling centers, and long distance gunhole drilling systems, ensuring we deliver a precision machined non magnetic drill collar China clients and global operators can rely on.

Lead Times & Minimum Order Quantity

We offer flexible procurement options to accommodate both emergency replacements and large-scale project planning:

• Ready Stock: Standard high strength API 7-1 non magnetic drill collar P750HS available; single-piece MOQ, approx. 7-day delivery.
• Custom Forgings/Rolled Materials: MOQ typically 3 tons, approx. 30-day delivery.
• Small Batch Special Grades: Melted via our small induction furnaces, starting from 3-5 tons.
• Large Volume Orders: 30-60 tons via EAF, ensuring fast delivery cycles.

Chemical Composition

The carefully balanced chemistry of P750HS austenitic stainless steel provides the foundation for its exceptional non-magnetic and anti-corrosion properties:

Melting & Processing Routes

As a dedicated non magnetic drill collar manufacturer, ShunFu Metal offers flexible melting routes tailored to specific client requirements and operational severity. The standard route for P750HS non magnetic steel is EAF + AOD + LF + VD, ensuring high purity and consistently low magnetic permeability.

For more stringent applications requiring enhanced metallurgical cleanliness, Electroslag Remelting (ESR or PESR) can be integrated to further reduce non-metallic inclusions. For the ultimate performance in extreme environments, we provide the VIM + VAR route. Clients can consult with ShunFu Metal's engineering team to select the most cost-effective and performance-optimized melting solution for their project.

Mechanical Properties

The mechanical integrity of the P750HS non magnetic drill collar is achieved through our specialized full-length cold-working process, tested at room temperature (OD up to 6"):

Heat Treatment Process

Proper thermal processing is critical to preventing sensitization and achieving the target yield strength of 175 ksi in the P750HS non magnetic drill collar:

Surface Finish & Precision Machining

ShunFu Metal provides extensive surface finishing and precision machining for P750HS drill collars. Our capabilities include CNC turning, milling, and grinding to achieve tight dimensional tolerances. We specialize in BTA boring and long distance gunhole drilling for deep, precise internal holes required in drill pipe and collar assemblies.

For surface enhancement, we offer roller burnishing and shot peened non magnetic drill collar processing, which induces compressive stress to prevent transgranular SCC. Additionally, we provide laser clad non magnetic drill collar 6 axis machining for superior wear resistance on tool joint connections. These advanced processes achieve surface roughness down to Ra 0.8 µm and precise dimensional tolerances, ensuring flawless downhole performance and extended service life.

Quality Assurance & Inspection

ShunFu Metal enforces rigorous quality assurance across pre-production, in-process, and post-production stages. Each P750HS non magnetic drill collar undergoes 100% volumetric ultrasonic inspection per ASTM E 114. Magnetic permeability is verified using our proprietary Forster Magnetomat 1.782 "Hot-Spot" test, with results certified on a printout—essential for any non magnetic drill collar test report example.

Intergranular corrosion resistance is validated per ASTM A262 Practice A & E. We also conduct comprehensive chemical analysis, mechanical testing, dimensional checks, and metallographic inspections. ShunFu issues EN 10204 3.1 certificates as standard, with 3.2 available upon request, and facilitates third-party inspections by SGS or TÜV. All processes operate under our API Q1 and ISO 9001 certified management systems.

Packing & Shipping Protocols

ShunFu Metal ensures secure packaging tailored to the product finish. For black-skin or as-forged materials, heavy steel wire strapping secures the bundles, preventing any shifting or container damage during transit. For bright surface and precision machined P750HS drill collars, we utilize multiple layers of protective wrapping materials—such as VCI paper and custom wooden crates—to safeguard critical surface roughness and strict dimensional tolerances.

All products are coated with high-grade anti-rust oil, guaranteeing absolute protection against corrosion throughout long-distance sea transport to the Middle East, Europe, or Southeast Asia.

Frequently Asked Questions