Tantalum (R05200 Reference)
Tantalum is a refractory metal with exceptional resistance to many acids because of its stable protective oxide film. Since 'tantalum' is a material family rather than a single grade, this page uses wrought unalloyed UNS R05200 as the engineering reference.
Tantalum (R05200 Reference) Information
Tantalum is a refractory metal with exceptional resistance to many acids because of its stable protective oxide film. Since 'tantalum' is a material family rather than a single grade, this page uses wrought unalloyed UNS R05200 as the engineering reference.
Metallic winding and compatible ring components where service conditions are suitable.
| Reference Grade | UNS R05200 |
|---|---|
| Common Product Specification | ASTM B708 |
| Material Type | Unalloyed wrought tantalum |
| Common / Applicable Specification | ASTM B708 (reference grade R05200) |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Tantalum (R05200 Reference) Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Tantalum | Ta | Balance / principal constituent |
| Niobium | Nb | 0.10 max. (reference limit) |
| Tungsten | W | 0.05 max. (reference limit) |
| Molybdenum | Mo | 0.02 max. (reference limit) |
| Iron | Fe | 0.01 max. (reference limit) |
| Titanium | Ti | 0.01 max. (reference limit) |
Tantalum (R05200 Reference) Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | ≈207 min. | MPa |
| 0.2% Offset Yield Strength | ≈138 min. | MPa |
| Elongation | ≈25 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Tantalum (R05200 Reference) Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 16.65 g/cm³ |
|---|---|
| Structure | Body-centered cubic refractory metal |
| Corrosion Behaviour | Outstanding resistance to many acids; important exceptions include hydrofluoric acid and strongly alkaline fluoride media. |
| Temperature Behaviour | Very high melting point, but oxidation in air becomes important at elevated temperature. |
| Service Selection | Confirm exact tantalum grade, fabrication condition and media before design. |
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