TUNGSTEN–NICKEL–IRON HIGH-DENSITY MATERIALS
WNiFe Tungsten Heavy Alloy
ASTM-class and property-controlled sourcing for WNiFe mill products and finished components.
MNK-G.S.A sources tungsten–nickel–iron heavy alloy by ASTM class where applicable, exact manufacturer composition, density, mechanical properties, magnetic requirement, product form, dimensions, drawing, inspection documents and destination.
Binder System and ASTM Class Are Separate Requirements
WNiFe combines a high tungsten content with a nickel–iron binder. ASTM B777 defines four density and property classes but does not remove the need to confirm actual chemistry, magnetic response, manufacturing route and part-specific requirements.
Material Definition and Supply Scope
Elmet ET90
Elmet ET90: nominal 90 wt.% W, 7 wt.% Ni and 3 wt.% Fe; listed by the manufacturer under ASTM B777 Class 1.
Elmet ET92.5
Elmet ET92.5: nominal 92.5 wt.% W, 5.3 wt.% Ni and 2.2 wt.% Fe; manufacturer reference for ASTM B777 Class 2.
Elmet ET95
Elmet ET95: nominal 95 wt.% W, 3.5 wt.% Ni and 1.5 wt.% Fe; manufacturer reference for ASTM B777 Class 3.
Elmet ET97
Elmet ET97: nominal 97 wt.% W, 2.1 wt.% Ni and 0.9 wt.% Fe; manufacturer reference for ASTM B777 Class 4. Confirm ductility and part-specific tests separately.
Rod, Plate and Blocks
Semi-finished products are sourced by class, complete dimensions, condition, machining allowance, surface and test requirements.
Parts to Drawing
Counterweights, shields, collimators, dampers and custom components require part geometry, mass, tolerances, magnetic behaviour and inspection 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 Shapes / Parts | According to drawing | Class, binder, density, properties and machining route are confirmed individually. |
The complete class–form–dimension combination must be verified for the actual source and batch.
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.
Elmet Heavy-Alloy Manufacturing Examples
Elmet publishes the following standard sizes and custom manufacturing capabilities. They are examples for its heavy-alloy programme, not an ASTM dimensional requirement or proof of availability for every WNiFe grade. Sources and grade-specific limitations.
| Product form | Published size example | Qualification |
|---|---|---|
| Sintered rod | Ø12.7–25.4 mm; length Sintered rod length: ≤609.6 mm Elmet WHA - Sintered rod length; Elmet Technologies. Sintered rod: source up to 24 in; exact SI conversion, source metric column rounds to 610 mm. Elmet WHA programme example, not a universal WNiFe or ASTM size limit, stock promise or interchangeable combination. Confirm exact alloy, binder, class, condition, tolerances and all dimensions together. Inch dimensions use the exact factor 25.4 mm/in; block examples retain the source metric values, not conversions of rounded inch entries. Source: Elmet - Tungsten Heavy Alloy Machining: Standard Product Sizes (Undated web programme; Standard Product Sizes checked 2026-10-15, p. Standard Product Sizes). Reviewed: 2026-10-15. | Standard-product example; class, binder and as-sintered condition must be confirmed. |
| Swaged rod | Ø6.35–25.4 mm; length ≤1219.2 mm | Route-specific example. The source lists 762 mm as a common swaged-rod length, not a limit. |
| Special-mould sintered rod | Ø15.875–101.6 mm; length ≤609.6 mm | Requires size-specific tooling; larger diameters may require shorter lengths. |
| Hot-rolled plate | thickness 6.35–25.4 mm; width ≤609.6 mm; length ≤609.6 mm | Full thickness–width–length combination and ASTM class remain subject to confirmation. |
| Sintered blocks | Metric catalogue examples: 150 mm × 120 mm × 57 mm; 180 mm × 58 mm × 51 mm | These are the source’s listed metric mould examples, not exact conversions of its rounded inch entries or a continuous size range. |
Dimensional values checked: 15 October 2026. Rod and plate values use exact inch-to-mm conversion; rounded values in the source metric column can differ from the exact conversion. Block examples retain the listed metric values. Confirm complete combinations, not independent maxima.
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.
ASTM Class Is Not Chemistry
A Class 1–4 designation does not by itself prove a particular nickel–iron ratio. The actual W, Ni and Fe values are checked against the approved manufacturer grade.
Magnetic Behaviour
WNiFe is generally magnetic or slightly magnetic. If permeability is critical, a numerical requirement and test method must be stated.
AMS 7725
Some manufacturer grades publish an AMS 7725 class and type cross-reference. The required edition, class, type and procurement scope are verified before quotation.
EN 10204:2004
Inspection-document type, including 3.1 or 3.2 where available, is specified with chemistry, density, mechanical, dimensional and traceability results.
Part-Specific Testing
ASTM coupon properties may differ from large or complex parts. Critical components can require testing from the part or an agreed additional inspection plan.
Reference Physical and Mechanical Properties
Reference Basis
Reference properties below follow the Elmet two-page Tungsten Heavy Alloy Products PDF, page 2, for ET90, ET92.5, ET95 and ET97. The PDF has no printed revision date and does not specify test temperature or specimen direction. Confirm production and heat-treatment condition for the order. Sources and grade-specific limitations.
Composition and Density
Elmet reference density: ET90, 17 g/cm³; ET92.5, 17.5 g/cm³; ET95, 18 g/cm³; ET97, 18.5 g/cm³. These named grades do not define every WNiFe composition.
Tensile Properties
The cited PDF lists UTS minima: ET90, ≥758 MPa; ET92.5, ≥758 MPa; ET95, ≥724 MPa; ET97, ≥689 MPa. Its yield-strength minimum is ≥517 MPa for these grades. These are document-specific references, not universal ASTM minima; acceptance requires the agreed grade and condition.
Hardness
PDF hardness maxima: ET90, ≤32 HRC; ET92.5, ≤33 HRC; ET95, ≤34 HRC; ET97, ≤35 HRC. Confirm the test method and delivered condition; do not convert these to another hardness scale without a valid material-specific basis.
Magnetic Behaviour
Elmet ET90, ET92.5, ET95 and ET97 are listed with permeability >1.05. Other nickel–iron recipes can have a lower response; neither the WNiFe family name nor an NM suffix replaces certified chemistry and a magnetic test. Property and composition values checked: 15 October 2026. The named ET columns of the two-page PDF are the reference; adjacent Kulite K compositions are not substituted. Dimensions above use separate programme sources.
Part versus Coupon
Published datasheet and ASTM values commonly relate to standardized test specimens. Large, thick or complex finished parts may require additional sampling or part-specific testing.
Application Context
Counterweights and Inertia
Dense components designed around target mass, centre of gravity, strength, geometry, balance and magnetic constraints.
Radiation Management
Shields and collimators defined by radiation type, attenuation geometry, machining, joining and regulatory requirements.
Damping and Precision Components
High-density parts for vibration, boring, balancing and other engineered systems after load and tolerance review.
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.
Technical sources
- Elmet: two-page product datasheet, property table on page 2
- Elmet: named-grade chemistry and custom product dimensions
- Elmet: standard product-size examples
- ASTM B777-15(2026): official scope
Related comparisons
Send Your WNiFe Tungsten Heavy Alloy Inquiry
Provide the material grade or composition, governing specification, product form, complete dimensions, quantity, inspection-document requirements and delivery destination.