Project Description
P650HS Non Magnetic Drill Collar for Extreme Drilling
The P650HS non magnetic drill collar represents the pinnacle of austenitic Mn-Cr-Mo-N stainless steel technology, specifically engineered for extreme subsurface environments. As a dedicated drill collar manufacturer, ShunFu Metal employs an advanced chemical composition control system coupled with a specialized forging process. This guarantees the material's exceptional mechanical integrity, superior pitting corrosion resistance, and high fatigue endurance.
The core characteristics of this non magnetic steel for drilling include a minimum yield strength of up to 1242 N/mm² (180 ksi) achieved through a proprietary full-length cold-working process, and extremely low magnetic permeability (μr < 1.005). This ensures zero magnetic interference with downhole measurement instruments, making it the definitive choice for precision non magnetic collars for oil and gas operations requiring absolute directional accuracy and structural reliability.
Downhole Applications and Usage
P650HS is purpose-built for the most demanding downhole directional drilling environments. Its non-magnetic properties and high mechanical strength make it the ideal material for specialized downstream products where magnetic interference would compromise survey data.
Oil and Gas Extraction
- MWD tool housing and non magnetic drill collar for directional drilling.
- Non magnetic LWD applications and stabilizer mandrels.
- Flex joints and non-magnetic heavyweight drill pipe components.
Drilling Engineering and Mining
- Non magnetic drill string components, including slick spiral and flex type collars.
- Custom length NM solid bars for specialized downhole assemblies.
- High-strength structural components for precision surveying tools in magnetically sensitive geological zones.
Specifications and Execution Standards
P650HS non magnetic drill collars and raw materials are manufactured and tested in strict accordance with international standards to ensure full downhole reliability and traceability.
- API Spec 7-1: Covers the design and manufacturing of drill collars (Latest Edition).
- ASTM A262 (Pract. A & E): Standard for detecting intergranular corrosion susceptibility in austenitic stainless steels.
- ASTM E114: Standard for ultrasonic inspection, ensuring 100% volumetric integrity.
Available product shapes include forged solid round bars, rolled round bars, hollow bars, and precision-machined drill collars.
Equivalent Grades and Designations
P650HS is a proprietary high-performance austenitic grade. It does not have direct equivalent tradenames in standard DIN, EN, or GB systems, as it is functionally positioned above standard P530/P550 series non-magnetic steels.
| Tradename / Standard | Designation | Country / System |
|---|---|---|
| Proprietary Grade | P650HS | ShunFu / Industry Standard |
| API Spec 7-1 | Non-Magnetic Drill Collar | International (API) |
Chemical Composition of P650HS
The carefully balanced austenitic composition of P650HS delivers its unique combination of high strength, non-magnetic permeability, and localized corrosion resistance.
| Element | P650HS (%) |
|---|---|
| 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 |
*Note: The Nitrogen range reflects the alloy's high-interstitial design for strength enhancement. Values are presented exactly as per proprietary technical data sheets.
Mechanical Properties
The following mechanical properties are achieved at room temperature through our specialized full-length cold-working process over the entire collar length.
| Property | OD up to 9 1/4" | OD 9 1/2" and larger |
|---|---|---|
| Yield Strength (min., 0.2% offset) | 1242 N/mm² (180 ksi) | 1173 N/mm² (170 ksi) |
| Tensile Strength (min.) | 1277 N/mm² (185 ksi) | 1277 N/mm² (185 ksi) |
| Elongation (min.) | 12% | 12% |
| Reduction of Area (min.) | 50% | 50% |
| Impact Energy (min.) | 110 J (80 ft.lb) | 110 J (80 ft.lb) |
| Endurance Strength / N=10⁵ (min.) | 550 N/mm² (80 ksi) | 550 N/mm² (80 ksi) |
| Hardness Brinell | 330 - 450 HB | 330 - 450 HB |
Melting and Processing Routes
Depending on the severity of the downhole application, ShunFu Metal offers flexible melting routes for P650HS to meet specific cleanliness and segregation requirements. Clients are encouraged to consult with our metallurgists to select the most cost-effective and technically appropriate melting solution.
- Conventional Route (EAF + AOD + LF + VD)
- Produces high-quality austenitic stainless steel suitable for standard directional drilling applications.
- Enhanced Route (ESR / PESR)
- Offers enhanced structural homogeneity required for critical applications and deeper well depths.
- Premium Route (VIM + VAR)
- Provides the highest purity and fatigue life for the most demanding subsurface environments.
Heat Treatment and Thermal Processing
To prevent material sensitization and optimize the austenitic structure, P650HS undergoes rigorously controlled thermal and mechanical processing. Specific temperature parameters are proprietary to ShunFu's API-calibrated process to ensure maximum performance.
| Process Type | Temperature Range | Holding Time | Cooling Method |
|---|---|---|---|
| Warm Forging | Controlled proprietary range | Per cross-section ratio | Controlled air cooling |
| Quenching (Post-Forging) | Controlled proprietary range | Calculated per OD | Rapid Water Quenching |
| Cold Working (Full Length) | Ambient / Room Temperature | N/A (Mechanical strain) | N/A |
Surface Finish and Precision Machining
ShunFu Metal transforms P650HS solid bars into finished precision machined non magnetic drill collar products through a comprehensive suite of in-house processing. We perform CNC turning and milling to establish precise outer profiles and connection threads.
Internal bores are refined via BTA deep hole boring and long-distance gunhole drilling, achieving strict dimensional tolerances. Surface integrity and fatigue life are maximized through shot peening, roller burnishing, and specialized hammer peening on critical connection stress zones. For extreme wear zones, we offer laser cladding on 6-axis applications. These combined techniques achieve internal surface roughness down to Ra ≤ 0.8 μm and ID tolerances compliant with strict API specifications.
Quality Assurance and Inspection
ShunFu Metal operates under an ISO 9001 and API Q1 certified Quality Assurance System, ensuring total control from raw material sourcing to final dispatch. 100% of P650HS non magnetic drill collar products undergo rigorous hot-spot testing using a Forster Magnetomat 1.782 to guarantee absolute non-magnetic permeability (μr < 1.005).
- Full volumetric UT inspection executed per ASTM E114.
- Material integrity verified via chemistry analysis, mechanical testing, dimensional checks, and metallographic examination.
- Intergranular and pitting corrosion resistance validated per ASTM A262.
- EN 10204 3.1 certificates issued as standard; 3.2 certification available upon request.
- Third-party inspections by SGS or TÜV seamlessly arranged.
Available Sizes and Delivery Terms
ShunFu Metal provides comprehensive size ranges for P650HS to accommodate diverse downhole requirements. We supply rolled and forged round bars (OD up to 9 1/4" for 180 ksi yield, and larger ODs up to 9 1/2" and above for 170 ksi yield), forged flat bars, and hollow bars.
- Common Sizes (Ready Stock): Available in single-piece orders with a ~7 day delivery.
- Custom Forging/Rolling: MOQ of 3 tons, delivery within ~30 days.
- Small Special Batches: Melted via small induction furnace (3-5 tons minimum).
- Large Volume Orders: Processed via 30-60 ton EAF furnaces for rapid, mass-scale delivery.
Packing and Shipping
For black or rough-machined P650HS bars, we utilize heavy-duty wire strapping to secure bundles, preventing any shifting or container damage during transit. For non magnetic drill collar API 7-1 compliant finished products with bright or precision-machined surfaces, we apply multi-layer protective wrapping—including plastic film, moisture barriers, and wooden crates—to preserve surface roughness and dimensional accuracy.
All products are coated with specialized anti-rust oil, ensuring complete protection against corrosion throughout long-distance ocean shipping.
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