Project Description
Magnadur 509 Non-Magnetic Steel Overview
Magnadur 509 non-magnetic steel is a premium austenitic specialty alloy originally developed by Deutsche Edelstahlwerke GmbH. It is engineered specifically for extreme downhole environments where both magnetic neutrality and structural integrity are paramount. To explore similar options, review our complete non-magnetic steel product catalog.
The core chemical composition of Magnadur 509 is strategically balanced with high manganese (18.0–20.0%), chromium (17.0–19.0%), and nickel (2.50–3.50%), alongside molybdenum and nitrogen additions. This precise formulation delivers exceptional non-magnetic stability with a permeability of μ < 1.01, ensuring zero magnetic interference for sensitive measurement instruments.
Furthermore, this alloy offers a superior PREN of 28–33 and enhanced resistance to intergranular corrosion. This provides reliable performance and extended service life in aggressive, corrosive petroleum operations. You can learn more about ShunFu Metal and our commitment to quality steel manufacturing on our about page.
Key Applications in Downhole Environments
Magnadur 509 non-magnetic steel is specifically designed for critical downstream products in the Oil & Gas, Mining, and Drilling sectors where magnetic interference must be strictly eliminated:
- MWD equipment housings
- Non-magnetic drill collars (NMDC) for directional drilling, compatible with our premium drill collar products
- Downhole measurement instruments and sensors
- Stabilizers and non-magnetic subs
- Rock drilling components subject to high mechanical stress
- Precision measurement tools operating in sour service conditions
- Mud motor rotors and stator shells in aggressive fluids
Specifications and Equivalent Grades
As a proprietary special steel, Magnadur 509 does not possess direct equivalents in standard ASTM, AMS, API, DIN, EN, ISO, JIS, GOST, or GB grade catalogs. Its optimized composition for MWD applications makes it a unique non-standard special steel. However, the material is manufactured and tested in strict compliance with applicable standards, such as ASTM A 262 Practice A and E for evaluating intergranular corrosion resistance.
| Trademark / Origin | Equivalent Standard Designation | Notes |
|---|---|---|
| Magnadur 509 (Deutsche Edelstahlwerke) | Proprietary Non-Standard Special Steel | No direct universal ASTM/EN equivalent exists due to its proprietary composition optimized for MWD applications. |
Product shapes include Round Bars (Hot-Rolled & Forged) and Hollow Bars. For related hollow stock, visit our hollow bar product category.
Available Sizes and Delivery Options
SHUNFU METAL provides Magnadur 509 non-magnetic steel across a versatile size range to accommodate demanding project specifications:
- Rolled & Forged Round Bars: Diameter 20 mm to 280 mm (0.8" to 11")
- Hollow Bars: Outer diameter 75 mm to 250 mm (3" to 10") with various customizable wall thicknesses
We emphasize our advanced processing capabilities, featuring API-standard regularly calibrated heat treatment furnaces alongside precision machining equipment. This includes BTA deep hole drilling, CNC lathes and milling machines, and long-distance gunhole drilling—ensuring tight tolerances for complex downhole geometries.
- Ready Stock
- Available for common sizes, single-piece MOQ, approximate 7-day delivery.
- Custom Forgings/Rolled Materials
- MOQ typically starts at 3 tons, approximate 30-day delivery.
- Small Batch Special Grades
- Utilizing our small induction furnaces, melting starts from 3–5 tons.
- Large Volume Orders
- Processed via 30–60 ton electric arc furnaces (EAF) for rapid, efficient delivery.
Chemical Composition of Magnadur 509
The carefully controlled chemistry of Magnadur 509 non-magnetic steel ensures both low permeability and high corrosion resistance. Notably, the extremely low maximum sulfur content of 0.005% represents a critical deviation from standard stainless steels, optimized for superior transverse ductility and fatigue resistance in downhole conditions.
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| Min. | – | – | 18.0 | – | – | 17.0 | 2.50 | 0.90 | 0.50 |
| Max. | 0.05 | 0.30 | 20.0 | 0.03 | 0.005 | 19.0 | 3.50 | 1.20 | 0.60 |
Melting and Processing Routes
SHUNFU METAL offers flexible melting routes for Magnadur 509 non-magnetic steel to align with your specific quality requirements. The conventional route utilizes EAF + AOD + LF + VD, ensuring baseline purity for stainless alloys. For stricter inclusion control, we recommend ESR or PESR. For the highest demands in ultra-clean microstructures, VIM + VAR is available. Customers can consult with our technical team to negotiate and select the optimal melting solution for their application.
Mechanical Properties
The mechanical properties of Magnadur 509 are achieved through a specialized work-hardening process, yielding high strength and toughness necessary for directional drilling tools. Note that Yield and Tensile Strength differences for the larger diameter range are bolded to highlight size-dependent mechanical variations.
| Property | 75–216 mm (3–8½”) | 217–250 mm (8¾–9¾”) |
|---|---|---|
| Hardness (HB) | ≥ 290 | ≥ 290 |
| Min. Yield Strength (Rp0.2) | 900 MPa (130 ksi) | 830 MPa (120 ksi) |
| Min. Tensile Strength (Rm) | 965 MPa (140 ksi) | 900 MPa (130 ksi) |
| Min. Elongation (A5) | 20% | 20% |
| Min. Reduction of Area (Z) | 50% | 50% |
| Min. Impact Energy (AV) | 135 J (100 ft-lbs) | 135 J (100 ft-lbs) |
| Min. Fatigue Strength | 445 MPa (65 ksi) | 445 MPa (65 ksi) |
Heat Treatment Parameters
Specific solution annealing temperatures are adjusted based on the target mechanical properties and diameter; standard parameters are proprietary to the mill’s strain-hardening methodology.
| Process Type | Condition | Temperature Range | Holding Time | Cooling Method |
|---|---|---|---|---|
| Solution Annealing | Forged condition prior to work hardening | Customized per required final hardness | Calculated by cross-section | Water / Rapid Air |
| Work Hardening (Strain Hardening) | Final delivery condition | Ambient / Room Temperature | N/A (Mechanical process) | N/A |
Surface Finish and Machining Capabilities
For Magnadur 509 hollow bars and drill collars, SHUNFU METAL provides comprehensive surface and precision machining solutions. We offer rough turning (Ra ≤ 3.2 µm) and precision grinding (Ra ≤ 0.8 µm) for outer diameter control. For internal bores, we utilize BTA deep hole boring and long-distance gunhole drilling, achieving Ra ≤ 1.6 µm and dimensional tolerances of ±0.05 mm.
Roller burnishing is available to enhance surface fatigue strength, and shot peening can be applied to optimize stress distribution. CNC milling ensures complex feature accuracy, delivering fully machined components ready for downhole assembly.
Quality Assurance and Inspection
SHUNFU METAL enforces rigorous pre-production, in-process, and post-production QC protocols. Ultrasonic testing (UT) is executed per applicable standards to verify internal soundness. We conduct comprehensive chemical composition analysis, mechanical property testing, dimensional verification, and metallographic examinations.
For Magnadur 509 non-magnetic steel, intergranular and pitting corrosion tests are systematically performed according to ASTM A 262 Practice A & E. We issue EN 10204 3.1 certificates by default, with 3.2 certification available upon request. Third-party inspections by SGS or TÜV can be arranged. All processes operate under our API Q1 and ISO 9001 certified quality management systems.
Packing and Shipping Protocols
Black-skin Magnadur 509 bars are securely fastened with steel wire tying to prevent movement and container damage during transit. For bright-surface and precision-machined components, we utilize multi-layer protective packaging materials to safeguard surface roughness and dimensional integrity. All products are coated with specialized anti-rust oil, ensuring complete protection against corrosion throughout maritime shipping.
Frequently Asked Questions
Can you supply Magnadur 509 to API specification?
While Magnadur 509 is a proprietary non-standard grade, SHUNFU METAL manufactures and tests it in full compliance with API Q1 quality system requirements and ASTM A 262 corrosion standards, ensuring it meets the stringent performance demands of directional drilling operations.
What is the minimum order quantity for Magnadur 509?
We maintain ready stock for common sizes with a single-piece MOQ and 7-day delivery. For custom-forged or rolled specifications, the MOQ is typically 3 tons with a 30-day lead time. Small-batch melting via our induction furnaces starts at 3–5 tons.
How does Magnadur 509 compare to standard non-magnetic steels?
Magnadur 509 features a higher PREN value (28–33) and significantly better pitting corrosion resistance than conventional non-magnetic alloys. Its ultra-low sulfur content (≤ 0.005%) also provides superior transverse toughness and fatigue life for MWD tools.
What machining capabilities do you offer for Magnadur 509 hollow bars?
We provide end-to-end machining using BTA deep hole drilling and long-distance gunhole drilling for internal bores, alongside CNC turning, milling, and grinding. We can deliver fully finished MWD housings and drill collars ready for final assembly.