Tantalum Plate & Sheet – ASTM B708 R05200, R05400, Ta-2.5W, Ta-10W & Ta-40Nb
ASC LLP, Mumbai, supplies tantalum plate, sheet, strip and foil to ASTM B708 / ASME SB708 in unalloyed tantalum (R05200, R05400) and the tantalum alloys Ta-2.5W, Ta-10W and Ta-40Nb. Material comes as full sheets or cut to size, with EN 10204 3.1 certificates. See our full tantalum product range.
What Are Tantalum Plates & Tantalum Sheet?
Tantalum plates and tantalum sheet are flat products of tantalum, a refractory metal with a density of 16.6 g/cm³ and a melting point of 3,017 °C. The most common grades, R05200 and R05400, are unalloyed (pure) tantalum. Tungsten or niobium is added only where more strength or lower cost is needed. Tantalum is chosen mainly for its outstanding resistance to hot acids – it is often called the most corrosion-resistant metal in chemical service.
Tantalum Plate & Sheet – Quick Facts
- Standard: ASTM B708 / ASME SB708 (plate, sheet, strip)
- Grades: R05200, R05400 (unalloyed); R05252 (Ta-2.5W); R05255 (Ta-10W); R05240 (Ta-40Nb)
- Forms: plate, sheet, strip, foil, cut blanks and discs
- Condition: annealed (standard), stress-relieved or cold-worked
- Certificate: EN 10204 3.1 with interstitial analysis
Tantalum Plate Grades (ASTM B708)
| Grade | UNS | Composition | Typical use |
| Unalloyed, EB / VAR melted | R05200 | Ta (99.9%+) | Standard grade – linings, heat exchangers, spargers |
| Unalloyed, powder metallurgy | R05400 | Ta (PM) | General corrosion and electronics use |
| Ta-2.5W | R05252 | 2.0 – 3.5% W | Higher strength, thinner sections in hot acids |
| Ta-10W | R05255 | 9.0 – 11.0% W | Highest strength; high-temperature vacuum parts |
| Ta-40Nb | R05240 | 35 – 42% Nb | Lower-cost alternative where conditions are less severe |
Corrosion Resistance – Where Tantalum Works and Where It Doesn’t
- Excellent: hydrochloric, hydrobromic, nitric and sulphuric acids (up to high concentration and temperature), wet chlorine and bromine, most organic acids and chloride solutions.
- Avoid: hydrofluoric acid and fluorides, fuming sulphuric acid (SO₃ / oleum), hot concentrated alkalis and hot phosphoric acid containing fluoride.
- Hydrogen: avoid galvanic contact with active metals – tantalum can absorb hydrogen and become brittle.
- Temperature: tantalum oxidises in air above about 300 °C, so high-temperature use must be in vacuum or inert gas.
Tantalum Plate & Tantalum Sheet Sizes
| Product (ASTM B708) | Thickness | Typical size |
| Foil | 0.025 – 0.125 mm | Coils or cut pieces, widths to about 300 mm |
| Sheet | 0.13 – 4.7 mm (0.005 – 0.1875 in), width 152 mm and over | Up to about 600 × 1,000 – 2,000 mm |
| Strip | 0.13 – 4.7 mm, width under 152 mm | Coils or cut lengths |
| Plate | Over 4.7 mm (0.1875 in) | To order, cut to size |
| Cut parts | Any | Discs, rings, blanks and liners cut to drawing |
Weight of tantalum plate ≈ 16.6 kg per m² per mm of thickness (e.g. 1 mm sheet ≈ 16.6 kg/m²).
Mechanical Properties – ASTM B708 (annealed, minimum)
| Grade & thickness (annealed) | Tensile min | Yield (0.2%) min | Elongation min |
| R05200 / R05400, under 1.52 mm (0.060″) | 207 MPa (30 ksi) | 138 MPa (20 ksi) | 20% |
| R05200 / R05400, 1.52 mm and over | 172 MPa (25 ksi) | 103 MPa (15 ksi) | 30% |
| R05252 (Ta-2.5W), under 3.2 mm | 276 MPa (40 ksi) | 207 MPa (30 ksi) | 20% |
| R05252 (Ta-2.5W), 3.2 mm and over | 276 MPa (40 ksi) | 152 MPa (22 ksi) | 25% |
| R05255 (Ta-10W), sheet & strip | 482 MPa (70 ksi) | 414 MPa (60 ksi) | 15% |
| R05255 (Ta-10W), plate | 482 MPa (70 ksi) | 379 MPa (55 ksi) | 20% |
| R05240 (Ta-40Nb) | 241 MPa (35 ksi) | 103 – 138 MPa (15 – 20 ksi) | 25% |
Tantalum Plate Specifications
| Item | Details |
| Plate, sheet & strip | ASTM B708 / ASME SB708 |
| Grades | UNS R05200, R05400, R05252, R05255, R05240 |
| Related tantalum standards | B521 (tube), B365 (rod & wire), B364 (ingot) |
| Condition | Annealed, stress-relieved or cold-worked |
| Surface | Cold-rolled, cleaned / pickled; polished on request |
| Testing | Chemical incl. interstitials, tensile, grain size, bend test; UT on request |
| Certificate | EN 10204 3.1; third-party inspection on request |
Chemical Composition of Tantalum Plate (ASTM B708)
| Element (max %, unless range) | R05200 | R05400 | R05252 (Ta-2.5W) | R05255 (Ta-10W) | R05240 (Ta-40Nb) |
| Oxygen (O) | 0.015 | 0.03 | 0.015 | 0.015 | 0.020 |
| Carbon (C) | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| Nitrogen (N) | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| Hydrogen (H) | 0.0015 | 0.0015 | 0.0015 | 0.0015 | 0.0015 |
| Niobium (Nb) | 0.100 | 0.100 | 0.50 | 0.100 | 35.0 – 42.0 |
| Tungsten (W) | 0.050 | 0.050 | 2.0 – 3.5 | 9.0 – 11.0 | 0.050 |
| Molybdenum (Mo) | 0.020 | 0.020 | 0.020 | 0.020 | 0.020 |
| Fe, Ni, Si, Ti (each) | 0.010 | 0.010 | 0.010 | 0.010 | 0.010 |
| Tantalum (Ta) | Remainder | Remainder | Remainder | Remainder | Remainder |
Physical Properties of Tantalum
| Property | Value (unalloyed Ta, approx.) |
| Density | 16.6 g/cm³ |
| Melting point | 3,017 °C (5,463 °F) |
| Modulus of elasticity | ≈ 186 GPa |
| Thermal conductivity | ≈ 57 W/m·K |
| Thermal expansion (20–100 °C) | ≈ 6.5 µm/m·°C |
| Electrical resistivity | ≈ 13.5 µΩ·cm |
Applications of Tantalum Plates
| Industry | Applications of tantalum plate & sheet |
| Chemical processing | Vessel and column linings, heat exchangers, tube sheets, condensers |
| Acid production & recovery | Bayonet heaters, spargers, dip pipes and rupture discs |
| Pharmaceutical & fine chemicals | Reactor liners and high-purity process parts |
| High-temperature vacuum | Furnace heating elements, heat shields and crucibles (vacuum / inert gas only) |
| Electronics & coatings | Sputtering targets and electronic parts |
| Fabricated parts | Fittings and flanges formed from B708 sheet – see our tantalum fittings pages |
Implant-grade tantalum is supplied to ASTM F560, a separate medical specification.
Related Tantalum Products
- Tantalum seamless pipes and tantalum welded pipes (ASTM B521)
- Tantalum bars & rods (ASTM B365)
- Tantalum fittings – including B708 sheet-formed Ta-2.5W, Ta-10W and Ta-40Nb fittings
- Tantalum flanges and tantalum fasteners
Why Choose ASC LLP for Tantalum Plates?
- Correct grade and paperwork: ASTM B708 plate and sheet with 3.1 certificates showing interstitials and tensile results.
- Cut to size: full sheets, foil, strips and cut blanks or discs – no need to buy more than you use.
- All tantalum forms: plate, tube, bar, fittings, flanges and fasteners from one supplier.
- Clean, protected packing for high-value material.
Send grade, thickness, size and quantity to contact us, email sales@amardeepsteel.com or call 022-67439130.
Frequently Asked Questions – Tantalum Plates
Which standard covers tantalum plate and sheet?
ASTM B708 / ASME SB708 covers tantalum and tantalum-alloy plate, sheet and strip in grades R05200, R05400, R05252 (Ta-2.5W), R05255 (Ta-10W) and R05240 (Ta-40Nb).
What is the difference between tantalum plate and sheet?
Under ASTM B708, sheet is 0.13–4.7 mm (0.005–0.1875 in) thick and 152 mm or wider, strip is the same thickness but under 152 mm wide, and plate is thicker than 4.7 mm.
What is the tensile strength of tantalum sheet?
Annealed unalloyed tantalum (R05200 / R05400) under 1.52 mm thick has a minimum tensile strength of 207 MPa and yield of 138 MPa. Ta-10W sheet has a minimum tensile strength of 482 MPa.
Is tantalum plate an alloy?
The most common grades, R05200 and R05400, are unalloyed tantalum. Alloy grades are Ta-2.5W (R05252), Ta-10W (R05255) and Ta-40Nb (R05240).
Which acids is tantalum resistant to?
Tantalum resists hydrochloric, hydrobromic, nitric and sulphuric acid, wet chlorine and most organic acids. It is attacked by hydrofluoric acid, fuming sulphuric acid and hot concentrated alkalis.
Can you supply tantalum sheet cut to size?
Yes. ASC LLP supplies tantalum foil, sheet, strip and plate in full sizes or cut to size as blanks, discs and liners, with EN 10204 3.1 certificates.
Global Reach
ASC LLP supplies tantalum plate, sheet, tube and bar to chemical, pharmaceutical and high-temperature industries in the USA, Europe, the Middle East and Asia, with secure packing and full documentation. Buyers worldwide rely on our tantalum plates for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
