TUNGSTEN HEAVY ALLOYS & HIGH-DENSITY COMPONENTS
WNiFe & WNiCu Tungsten Heavy Alloys
ASTM B777 class-based sourcing for high-density tungsten-alloy material, blanks and precision components.
MNK-G.S.A sources tungsten heavy alloy by ASTM class where applicable, binder system, density, magnetic requirement, product form, dimensions, drawing, inspection and destination.
Class, Binder System and Part Requirements Must Be Aligned
Tungsten heavy alloys are mainly tungsten with a metallic binder system, commonly nickel–iron or nickel–copper. ASTM B777 defines four machinable high-density classes, but class alone does not replace the need to specify binder, magnetic behavior, geometry and part-specific inspection.
Material Definition and Supply Scope
ASTM B777 Class 1
Elmet identifies ET90 as an ASTM B777 Class 1 example. The composition below belongs to that named manufacturer grade, not a universal class limit. Elmet.
Nominal tungsten mass fraction: 90 wt.% Elmet ET90; Elmet Technologies. Elmet two-page Tungsten Heavy Alloy Products PDF, page 2. Use the named ET column, not the adjacent Kulite K grade. Reference values and stated inequalities belong to this document, not universal ASTM limits or guaranteed batch acceptance. Printed revision date, test temperature and specimen direction are not stated; confirm manufacturing and heat-treatment condition, exact grade and certificate. Chemistry is nominal mass fraction. Source: Elmet - Tungsten Heavy Alloy Products, two-page datasheet (No printed revision date; page 2 visually checked 2026-10-15; ET columns only, p. 2; ET90 column). Reviewed: 2026-10-15.
ASTM B777 Class 2
Elmet identifies ET92.5 as an ASTM B777 Class 2 example. The composition below belongs to that named manufacturer grade, not a universal class limit. Elmet.
Nominal tungsten mass fraction: 92.5 wt.% Elmet ET92.5; Elmet Technologies. Elmet two-page Tungsten Heavy Alloy Products PDF, page 2. Use the named ET column, not the adjacent Kulite K grade. Reference values and stated inequalities belong to this document, not universal ASTM limits or guaranteed batch acceptance. Printed revision date, test temperature and specimen direction are not stated; confirm manufacturing and heat-treatment condition, exact grade and certificate. Chemistry is nominal mass fraction. Source: Elmet - Tungsten Heavy Alloy Products, two-page datasheet (No printed revision date; page 2 visually checked 2026-10-15; ET columns only, p. 2; ET92.5 column). Reviewed: 2026-10-15.
ASTM B777 Class 3
Higher tungsten-content class used where density and attenuation requirements justify the accompanying change in ductility and processing.
ASTM B777 Class 4
Highest-density class in ASTM B777. The current standard notes that Class 4 is not available as a non-magnetic grade.
WNiFe
Nickel–iron binder systems are sourced by class, composition, density, mechanical properties, magnetic behavior and part requirements.
WNiCu / Low-Magnetic Options
WNiCu uses a Ni–Cu binder. Other formulations can also have low magnetic response; a non-magnetic trade label is not proof of WNiCu chemistry.
Published Manufacturing Examples: Confirm the Complete Size
Swaged Rod
Elmet swaged rod: diameter 6.35–25.4 mm; length ≤1219.2 mm. This is a source-specific programme, not a guarantee for every grade.
Sintered Rod
Elmet sintered rod: diameter 12.7–25.4 mm; length ≤609.6 mm. The special-mould programme lists diameter 15.875–101.6 mm; confirm tooling and the complete dimensional combination.
Rolled Plate and Sheet
Separate Elmet programmes: the listed sheet example is 2.032 mm (0.08 in), with width and length to be agreed. The standard hot-rolled plate programme lists thickness 6.35–25.4 mm, width ≤609.6 mm and length ≤609.6 mm. Do not transfer the plate width/length limits to the thin-sheet example. Confirm binder, grade, condition and all dimensions together. Sources and grade-specific limitations.
Blocks
Sintered blocks and custom moulds are available in a range of cross-sections. Maximum dimensions and length are limited by class, weight, tooling and furnace capacity.
Discs, Spheres and Blanks
Standard and custom discs, spheres, cubes, rings and near-net blanks are sourced by class, geometry, machining allowance and inspection.
Finished Components
Machined weights, shields, collimators, dampers and other parts require drawing review, part-specific tolerances, surface condition and test plan.
Standards and Documentation
ASTM B777-15(2026)
ASTM B777-15(2026) covers four classes of powder-consolidated machinable high-density tungsten-base metal. Inch-pound values are normative; SI equivalents are informative.
Coupon vs. Part Properties
ASTM B777 states that lot testing is based on test coupons and that properties can vary with part size and sampling location. Large or critical parts may require additional part-specific testing.
Magnetic Requirement
Specify the magnetic requirement in the purchase order. ASTM B777 scope 1.4 sets maximum permeability ≤1.05 (checked ) for non-magnetic material, tested under ASTM A342/A342M; Class 4 is excluded.
EN 10204:2004
Inspection-document type, including 3.1 or 3.2 where available, is stated together with the agreed chemistry, density, mechanical and dimensional results.
No Automatic EN Equivalent
No EN or DIN grade is assumed to be equivalent to an ASTM B777 class. Any requested European specification is checked by exact reference and product scope.
Part-Specific Inspection
For large sections or critical components, mechanical testing from the part, nondestructive examination or an agreed inspection plan can be specified before quotation.
Reference Physical and Mechanical Properties
Reference Basis
Examples below refer to named Elmet Ni–Fe grades, not all heavy alloys. The two-page product datasheet has no printed revision date and does not state tensile-test temperature or direction; confirm the supplied processing condition and acceptance criteria. Sources and grade-specific limitations.
Density
Elmet reference densities: ET90 17 g/cm³; ET92.5 17.5 g/cm³; ET95 18 g/cm³; ET97 18.5 g/cm³. These are named-grade references, not acceptance tolerances.
Strength
Elmet PDF tensile-strength entries: ET90 ≥758 MPa; ET92.5 ≥758 MPa; ET95 ≥724 MPa; ET97 ≥689 MPa. Yield strength for these four named grades: ≥517 MPa. These source-specific entries are not universal ASTM or batch acceptance limits; confirm the current certificate and testing conditions.
Hardness and Ductility
Elmet PDF hardness limits: ET90 ≤32 HRC; ET92.5 ≤33 HRC; ET95 ≤34 HRC; ET97 ≤35 HRC. Confirm the test method and material condition; specify elongation separately for the selected grade.
Magnetic Response
Binder chemistry and magnetic response are separate checks. Elmet ET90NM is listed as W 90 wt.% / Ni 8.9 wt.% / Fe 1.1 wt.% (nominal mass fractions; Elmet source; checked ); its NM label must not be reclassified as WNiCu.
Certificate Control
Tungsten content, binder composition, density, tensile properties, hardness, elongation, permeability and part-specific results must be confirmed for the offered grade and manufacturing condition.
Application Context
Balance and Counterweight
Static and dynamic balancing components selected by density, mass distribution, strength, magnetic requirement and geometry.
Radiation Management
Shielding, collimation and attenuation components designed around radiation type, thickness, geometry, joining and regulatory requirements.
Vibration and High-Density Parts
Damping, inertia and other high-density components sourced only after the application load case and part-specific requirements are defined.
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.
Elmet dimensions and the named ET property references were rechecked on . Values now come from the shared registry. Mechanical entries follow the linked two-page PDF; the web table differs and must not be substituted without clarification. The thin-sheet example has no confirmed width/length here. Sheet source: Elmet - Tungsten Heavy Alloy Hot Rolled Sheet (Undated product page; discrete standard thickness example and width/length limitation checked 2026-10-15, p. Standard Sizes: sheet thickness; width/length note).
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
- Elmet: hot-rolled sheet and plate programme
- MOLYTUN: heavy-metal catalogue and binder families
- ASTM B777-15(2026): official scope
Related comparisons
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