LOW-MAGNETIC TUNGSTEN–NICKEL–COPPER MATERIALS
WNiCu Tungsten Heavy Alloy
Composition- and permeability-controlled sourcing for WNiCu semi-finished products and custom parts.
MNK-G.S.A sources tungsten–nickel–copper heavy alloy by exact composition, ASTM class where applicable, density, permeability requirement, product form, dimensions, drawing, inspection documents and destination.
Non-Magnetic Performance Must Be Specified and Tested
WNiCu uses a nickel–copper binder and is selected when low magnetic response is important. A commercial WNiCu name does not guarantee one composition, ASTM class or permeability value; the complete requirement and manufacturer certificate govern acceptance.
Material Definition and Supply Scope
Class 1 WNiCu
MOLYTUN lists DensM 170 P as 90 % W with a Ni–Cu binder, associated with ASTM B777 Class 1. Confirm the offered chemistry and test certificate. MOLYTUN - W-heavy metals grade overview (Web page; no edition date stated; DensM 170 P / 175 P rows checked 2026-10-19, p. Grades & data sheets: DensM 170 P)
Class 2 WNiCu
MOLYTUN associates DensM 175 P with nominal 92.5 % W and Class 2. Its catalogue density entry needs clarification; no density value is adopted here. MOLYTUN - W-heavy metals grade overview (Web page; no edition date stated; DensM 170 P / 175 P rows checked 2026-10-19, p. Grades & data sheets: DensM 175 P)
Class 3 WNiCu
MOLYTUN lists DensM 180 P as a Class 3 WNiCu grade. Its revision 3 datasheet identifies 95–95.3 % W and 4.7–5 % NiCu as published percentages; the sheet does not explicitly state their basis. Sources and grade-specific limitations. MOLYTUN - DensM 180 P material data sheet (Revision 3 / 2024-10-04; page 1 checked 2026-10-15, p. 1, section 1: Wolfram)
No Non-Magnetic Class 4 Assumption
ASTM B777 states that Class 4 is not available as a non-magnetic grade. A Class 4 request must not be represented as WNiCu non-magnetic supply.
Semi-Finished Products
Rod, plate, blocks, discs, rings and other blanks are sourced by complete dimensions, condition, machining allowance and inspection.
Finished Components
Non-magnetic counterweights, shields and precision parts require drawing, target density or mass, permeability limit, tolerances and test plan.
Typical Global Sourcing Range: Source-Specific Review
Sourcing capability depends on the named grade and production route. No universal rod or plate envelope is asserted here; the documented examples and qualifications below must be read together. These are not MNK stock ranges.
| Product Form | Dimensional basis | Notes |
|---|---|---|
| Rod | Diameter and length to specification | Confirm grade, binder, condition and the complete diameter–length combination. |
| Plate / Block | Thickness, width and length to specification | Confirm all dimensions together with composition and processing; do not combine unrelated maxima. |
| Custom Parts | According to drawing | Composition, magnetic requirement, geometry and inspection govern feasibility. |
WNiCu and WNiFe do not have identical properties. Non-magnetic performance must be specified and tested.
Actual availability depends on grade, specification, quantity, tolerances, certification requirements and manufacturing source. Diameter, thickness, width and length must be confirmed as one complete combination.
Low-Magnetic and Non-Magnetic Qualification
WNiCu is often requested for reduced magnetic response, but the shorthand does not prove a binder recipe or magnetic performance. Published heavy-alloy programmes must be read by exact class, type, composition and test requirement. Sources and grade-specific limitations.
| Verification point | Published reference example | MNK-G.S.A control |
|---|---|---|
| ASTM B777 classes | The MOLYTUN catalogue associates WNiCu grades with Classes 1–3. ASTM B777 excludes a non-magnetic Class 4. | The requested class and magnetic type are stated separately; one is not inferred from the other. |
| Binder chemistry | A non-magnetic trade designation does not prove a Ni–Cu binder. For example, Elmet lists ET90NM as W 90 wt.% / Ni 8.9 wt.% / Fe 1.1 wt.% (nominal mass fractions; Elmet source; checked ), not WNiCu. | Use the certified elemental composition, not the commercial label WNiCu alone. |
| Magnetic permeability | ASTM B777-15(2026), scope 1.4: maximum permeability ≤1.05 (checked ) for a specified non-magnetic requirement, tested under ASTM A342/A342M. | The customer’s test method, limit and acceptance document must be defined in the inquiry. |
| Representative mill forms | MOLYTUN lists rods, bars, plates and finished parts. No numeric size envelope is adopted for all WNiCu grades. | Do not transfer dimensional limits from a general heavy-alloy programme to WNiCu without grade-specific confirmation. |
| Custom parts | Pressed, sintered and machined shapes are manufacturer- and tooling-specific. | Geometry, machining allowance, density, finish and inspection are confirmed as one complete requirement. |
Specify ASTM class separately from any manufacturer or AMS type designation. Agree exact binder chemistry, magnetic limit, production route, condition, dimensions and inspection before quotation.
Standards and Documentation
ASTM B777-15(2026)
ASTM B777-15(2026) covers four classes of powder-consolidated high-density tungsten-base material. Inch-pound values are normative; SI conversions are informative. Class does not replace chemistry, magnetic or part-specific requirements.
Non-Magnetic Requirement
The purchase order must state the required magnetic permeability and testing. The binder name alone is not an acceptance criterion.
Class 4 Limitation
The current ASTM B777 specification identifies that Class 4 is not available as a non-magnetic grade.
Manufacturer Grade
A European or international trade designation is treated as manufacturer-controlled and is not assumed to equal another source’s WNiCu grade.
EN 10204:2004
Inspection-document type may be requested with chemistry, density, permeability, mechanical, dimensional and traceability results supported by the source.
No Automatic EN / DIN Grade
No generic EN or DIN material designation is declared equivalent to an ASTM B777 WNiCu class without an exact documented reference.
Application Context
Low-Magnetic Counterweights
Dense balance and inertia parts for instruments and assemblies where a numerical magnetic limit is specified.
Medical and Radiation Components
Shielding and collimation parts developed around attenuation geometry, permeability, machining and regulatory controls.
Precision and Research Equipment
High-density non-magnetic components produced to drawing with composition, mass, tolerances and inspection agreed before manufacture.
Capability Note
Published dimensional ranges describe demonstrated manufacturing capability across specialist sources, not guaranteed stock and not one universal mill envelope. Diameter, thickness, width, length, condition, tolerance and quantity must be confirmed as one complete combination for each inquiry.
Relevant ASTM Tungsten References
Use the relevant ASTM reference together with the customer specification, drawing, required product form and inspection route. The standard number alone does not establish grade equivalence, stock availability, conformity or fitness for service.
Sources, Grade Data and Related Comparisons
Source review: 15 September 2026. Named grades illustrate the cited publisher’s data, not MNK stock, a partnership or automatic conformity. Agree the complete specification and certificate before procurement.
DensM 180 P: source-specific property example
MOLYTUN technical sheet, revision 3, dated 4 October 2024: room-temperature results on separately prepared test specimens. These values are not guaranteed finished-part results or a universal WNiCu specification.
| Property | Published range | Typical value |
|---|---|---|
| Density | 17.8–18.2 g/cm³ | 18 g/cm³ |
| Ultimate tensile strength | 650–760 MPa | 720 MPa |
| Vickers hardness (HV10) | 290–330 HV10 | 320 HV10 |
| Elongation | 2–7 % | 3 % |
Table values checked: 15 October 2026. The source revision remains 3, dated 4 October 2024.
Technical sources
- MOLYTUN: heavy-metal catalogue and binder families
- MOLYTUN: DensM 180 P, revision 3 (4 October 2024)
- Elmet: named-grade chemistry and custom product dimensions
- ASTM B777-15(2026): official scope
Related comparisons
Send Your WNiCu Tungsten Heavy Alloy Inquiry
Provide the material grade or composition, governing specification, product form, complete dimensions, quantity, inspection-document requirements and delivery destination.