TaM / UNS R05200 | ASTM B708-05 | Custom Tantalum Disc
TaM R05200 Tantalum Disc, D 290mm * T 3.5mm
This product is a custom high-purity tantalum disc manufactured to the specified diameter, thickness, surface finish, mechanical properties and chemical composition. It is supplied as a circular tantalum sheet component rather than a generic rectangular stock sheet.
The ordered material designation is TaM / UNS R05200, with ASTM B708-05 used as the base material standard. The additional purity, impurity, mechanical-property and roughness limits shown on this page form part of the product-specific purchase requirement and must be confirmed in the order documents.
D 290mmFinished disc diameter with a specified tolerance of +/-1mm. |
T 3.5mmFinished thickness with a specified tolerance of +/-0.1mm. |
Ta >=99.95%High-purity tantalum with additional control of oxygen, carbon, niobium, tungsten and molybdenum. |
Ra 0.8-1.6Specified finished surface roughness in micrometers. |
What This Tantalum Disc Is
A tantalum disc is a circular flat product cut and finished from tantalum sheet or plate. Compared with a general mill sheet, a finished disc gives the buyer a defined circular diameter, controlled thickness, prepared surface and documented acceptance requirements. This reduces unnecessary material removal and gives downstream manufacturing a more consistent starting component.
R05200 is an unalloyed tantalum grade produced from electron-beam or vacuum-arc melted material under ASTM B708. Tantalum is selected where a project values high chemical stability, high-temperature capability, vacuum compatibility, ductility or controlled purity. This page describes the supplied tantalum disc itself; the final application and suitability remain subject to the customer's engineering evaluation.
Product Specification
| Item | Specified Requirement |
| Product | Tantalum disc / tantalum circular sheet |
| Material designation | TaM / UNS R05200 |
| Base standard | ASTM B708-05 |
| Diameter | 290mm, tolerance +/-1mm |
| Thickness | 3.5mm, tolerance +/-0.1mm |
| Surface roughness | Ra 0.8-1.6 micrometers |
| Purity | Tantalum >=99.95% |
Purchase-Specification Control
ASTM B708-05 establishes the base requirements for tantalum plate, sheet and strip. The dimensions, Ra value, purity, impurity limits and mechanical properties listed here are the specified requirements for this product. Where an additional requirement is stricter than the base standard, the confirmed purchase specification and approved inspection plan govern acceptance.
Specified Mechanical Properties
The following values are product-specific acceptance requirements. Tensile properties are specified at a strain rate of 10-3/s. Sampling direction, specimen geometry, test method and report format should be confirmed in the order inspection plan.
| Property | Requirement |
| Yield strength | >=150MPa at 10-3/s |
| Ultimate tensile strength | >=230MPa at 10-3/s |
| Elongation after fracture | >=40% at 10-3/s |
| Vickers hardness | >=75 HV |
Specified Chemical Composition
For high-purity tantalum, small changes in interstitial and metallic impurity content can influence hardness, ductility, forming response and consistency. The agreed test method, sampling position and exact order limit should therefore appear on the material certificate or inspection report.
| Element / Group | Specified Limit |
| Tantalum purity | >=99.95% |
| Oxygen | Maximum within 100-150ppm, as fixed by the order |
| Carbon | Maximum 50ppm |
| Niobium + tungsten + molybdenum | Combined maximum within 300-400ppm, as fixed by the order |
Why This Tantalum Disc Is Difficult To Produce
Strength And Ductility TogetherThe product requires minimum yield and tensile strength while also requiring at least 40% elongation. Rolling reduction, annealing and material cleanliness must be coordinated rather than controlled as separate targets. |
Low Interstitial ContentOxygen and carbon can strengthen and harden tantalum but may reduce ductility when not controlled. Melting, thermomechanical processing, heat treatment and handling must limit contamination. |
Disc Geometry And ThicknessThe 290mm diameter, 3.5mm thickness and their respective tolerances must remain stable through cutting and surface finishing. Edge condition and distortion need to be controlled during final preparation. |
Uniform Surface FinishRa 0.8-1.6 micrometers requires controlled finishing without deep scratches, embedded contamination, local over-polishing or excessive thickness removal. |
Manufacturing And Control Route
| 1. Material planning | Confirm TaM / R05200 identity, ASTM B708-05 basis, chemistry limits, testing scope and traceability requirements before production. |
| 2. Rolling and annealing | Develop the rolling and thermal route around the required 3.5mm thickness and the combined strength, hardness and elongation targets. |
| 3. Circular preparation | Cut or machine the circular profile with allowance for final diameter, edge cleanup and dimensional verification. |
| 4. Surface finishing | Finish the specified faces to Ra 0.8-1.6 micrometers while protecting thickness and preventing cross-contamination. |
| 5. Final verification | Verify dimensions, surface roughness, chemistry, tensile properties, elongation and hardness according to the approved order and inspection plan. |
Inspection And Documentation
A useful inspection package connects every reported result to the supplied batch. The exact documents and witness points should be agreed before production, especially because the specified mechanical and impurity limits go beyond a basic dimensional purchase.
DimensionsDiameter, thickness and agreed additional geometry or edge requirements. |
SurfaceRa measurement and visual examination for scratches, dents, contamination and edge damage. |
Material TestsChemical composition, tensile properties, elongation and Vickers hardness against the agreed limits. |
TraceabilityBatch identification, material certificate and order-specific inspection records as required. |
Potential Application Areas
A high-purity R05200 tantalum disc may be evaluated as starting material or a finished flat component for the following fields. These examples do not define the actual end use of this product and do not replace the customer's material-compatibility or component qualification work.
Chemical ProcessingCircular tantalum components, corrosion-resistant equipment parts, covers, liners or formed elements for compatible aggressive media. |
Vacuum And High TemperatureVacuum-system parts, furnace components, shields, supports or custom thermal components used under suitable atmosphere conditions. |
Research And Precision EquipmentCustom circular stock for laboratory, semiconductor, electronics or special-equipment parts where tantalum purity and consistency matter. |
Application Boundary
Tantalum is highly corrosion resistant in many environments, but it is not universally resistant to every chemical, temperature or operating condition. Fluoride-containing media, hot concentrated alkalis, oxygen exposure at elevated temperature, galvanic conditions and hydrogen embrittlement risks require application-specific review. MH supplies the disc to the confirmed material and inspection specification; final service suitability remains the customer's engineering responsibility.
Why Work With MH
Refractory Metal RouteMaterial, rolling, annealing, cutting, finishing and inspection requirements are reviewed as one manufacturing route. |
Custom SpecificationsSupport for non-standard dimensions, impurity controls, mechanical properties, surface requirements and documentation. |
Inspection CapabilityDimensional, roughness, composition, tensile and hardness verification can be planned around the purchase specification. |
Long-Term Supply DisciplineMH has long-term refractory-metal supply experience for the Japanese market and supports order-specific documentation and traceability. |
Packing And Handling
The finished faces should be protected against scratching, moisture, shop contamination and metal-to-metal contact. Packing should prevent disc movement and edge impact during transport. Clean wrapping, face protection, rigid separation and an export-suitable outer package can be selected according to the agreed cleanliness and delivery requirements.
Information Required For Quotation
For this exact product, confirm the quantity, required delivery date, whether the oxygen limit is 100ppm or 150ppm, whether the combined Nb + W + Mo limit is 300ppm or 400ppm, and the required certificate and inspection-report format.
For related custom tantalum discs, send the material grade, standard edition, diameter, thickness, tolerances, surface roughness, edge condition, flatness if required, mechanical properties, chemistry limits, quantity, final application and any third-party inspection requirement. Related search terms covered by this page include R05200 tantalum disc, TaM tantalum sheet, ASTM B708 tantalum circle, 290mm tantalum disc, 3.5mm tantalum sheet, high-purity tantalum round blank and custom tantalum plate disc.
Related Tantalum Capabilities
Tantalum ProductsReview MH tantalum sheet, foil, tube, rod, wire, target and custom-component capabilities. |
0.025mm Tantalum FoilA related example of precision tantalum rolling, annealing, surface and handling control. |
Refractory Metals & Special AlloysExplore MH material, forming, rolling, capillary, target and precision-component capabilities. |
FAQ
Is this a standard stock tantalum sheet?
No. It is a custom circular tantalum sheet component with specified diameter, thickness, roughness, chemistry and mechanical-property requirements.
Does ASTM B708-05 alone define every requirement on this page?
No. ASTM B708-05 is the base flat-product standard. The listed purity, impurity, mechanical, dimensional and surface requirements are additional product-specific purchasing requirements where they are stricter or more detailed.
Why must oxygen and carbon be controlled?
These interstitial elements can affect tantalum hardness, strength and ductility. Defined limits help the buyer control material consistency and downstream processing behavior.
Can MH supply other tantalum disc dimensions?
Yes. Custom diameter, thickness, tolerance, surface, chemistry, temper and inspection requirements can be evaluated against the requested quantity and application.
Request A Quote For R05200 Tantalum Discs
Send MH the tantalum grade, standard edition, disc diameter, thickness, tolerances, surface roughness, chemistry limits, mechanical-property requirements, quantity and inspection documents. We can review the complete purchase specification and prepare a manufacturing and quotation response.
Send Your Tantalum Disc RequirementHot Tags: tam r05200 tantalum disc, China tam r05200 tantalum disc manufacturers, suppliers, factory, Ta 2 5W, Tantalum Niobium Alloy, Tantalum Parts, Tantalum Sheet Plate, Tantalum Thermocouple Protection Tube, Tantalum Wire
