ASTM B365 Tantalum and Tantalum Alloy Rod and Wire
- Type: Rod and Wire
- R05200, unalloyed Ta, EB furnace or VAM, or both
- R05400, unalloyed Ta, powder-metallurgy consolidation
- R05255, Ta alloy, 90% Ta, 10% W, EB furnace of VAM, or both
- R05252, Ta alloy, 97.5% Ta, 2.5% W, EB furnace or VAM, or both
- R05240, Ta alloy, 60% Ta, 40% Nb, EB furnace or VAM
ASTM B365 Tantalum and Tantalum Alloy Rod and Wire
Golden Sunbird Metals supplies premium ASTM B365 tantalum rod and wire in five high-purity grades — R05200, R05400, R05252, R05255, and R05240 — engineered for extreme environments where corrosion resistance, high-temperature stability, and biocompatibility are critical. Available as round, hexagonal, or octagonal rod (0.125–2.5 in. diameter) and precision wire (0.010–0.124 in. diameter), these products offer outstanding chemical inertness in acids and alkalis, excellent electrical conductivity, and a clean, defect-free surface finish ideal for machining and fabrication. Whether you need tantalum rod for chemical processing equipment, medical implants, or electronics components, or tantalum wire for fine-gauge applications, our ASTM B365-compliant material meets the strictest industry standards with full mill test certification.
R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both
R05400, unalloyed tantalum, powder-metallurgy consolidation
R05255, tantalum alloy, 90 % tantalum, 10 % tungsten, electron-beam furnace or vacuum-arc melt, or both
R05252, tantalum alloy, 97.5 % tantalum, 2.5 % tungsten, electron-beam furnace or vacuum-arc melt, or both
R05240, tantalum alloy, 60 % tantalum, 40 % niobium, electron-beam furnace or vacuum-arc melt, or both
Chemical Requirements (wt.%) of ASTM B365 Tantalum and Tantalum Alloy Rod and Wire
| Element | R05200 (EB Cast / VAC Unalloyed Tantalum) | R05400 (Sintered Unalloyed Tantalum) | R05255 (90% Ta 10% W) | R05252 (97.5% Ta 2.5% W) | R05240 (60% Ta 40% Cb) |
| C | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| O | 0.015 | 0.03 | 0.015 | 0.015 | 0.02 |
| N | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| H | 0.0015 | 0.0015 | 0.0015 | 0.0015 | 0.0015 |
| Nb | 0.1 | 0.1 | 0.1 | 0.5 | 35.0-42.0 |
| Fe | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Ti | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| W | 0.05 | 0.05 | 9.0-11.0 | 2.0-3.5 | 0.05 |
| Mo | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 |
| Si | 0.005 | 0.005 | 0.005 | 0.005 | 0.005 |
| Ni | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Ta | Remainder | Remainder | Remainder | Remainder | Remainder |
Additional Chemical Requirements for Finished Product (When Specified by the Purchaser) (wt.%)
| Element | All Grades |
| O | 0.025 |
| N | 0.01 |
| H | 0.0015 |
| C | 0.02 |
Mechanical Properties of ASTM B365 Tantalum and Tantalum Alloy Rod and Wire in Annealed Condition
| Material | Ultimate Tensile Strength min psi (MPa) | Yield Strength min psi (MPa) | Elongation min % 1 in. (25.4 mm) Gage Length |
| R05200 and R05400 Unalloyed tantalum | 25,000 (172) | 15,000 (103) | 25 |
| R05252 (97.5% Ta 2.5% W) | 40,000 (276) | 28,000 (193) | 20 |
| R05255 (90% Ta 10% W) | 70,000 (482) | 55,000 (379) | 20 |
| R05240 (60% Ta 40% Cb) | 35,000 (244) | 15,000 (103) | 25 |
For wire
| Diameter | Ultimate Tensile Strength min psi (MPa) | Elongation min %A |
| 0.010 to 0.124 in. (R05200 and R05400) | 30,000 to 35,000 (207 to 241) | 10 to 20 |
| 0.010 to 0.124 in. (R05252) | 70,000 (482) | 5 to 15 |
| 0.010 to 0.124 in. (R05255) | 35,000 to 70,000 (241 to 482) | 5 to 20 |
| 0.010 to 0.124 in. (R05240) | 35,000 (244) | 10 to 20 |
Note: A 10-in. (254-mm) gage length to 0.050 in. (1.27-mm) diameter and 1-in. (25.4-mm) or 2-in. (50.8-mm) gage length over 0.050-in. (1.27-mm) diameter.
Key Properties of ASTM B365 Tantalum Rod and Wire:
High Melting Point: Tantalum boasts a very high melting point, making it suitable for high-temperature applications.
Excellent Corrosion Resistance: Tantalum offers exceptional resistance to corrosion in a wide range of environments, including acids, alkalis, and salt solutions.
Good Strength and Ductility: These rods and wires possess a good balance of strength and ductility, allowing for some shaping and forming without compromising their integrity.
Good Electrical Conductivity: Tantalum conducts electricity moderately well.
Features
- ASTM B365 tantalum and tantalum alloy rod and wire, covering R05200, R05400, R05255, R05252, and R05240.
- Available in rod sizes from 0.125 to 2.5 in. diameter, with round, hexagonal, or octagonal cross sections in straight lengths.
- Wire available from 0.010 to 0.124 in. diameter, furnished in coils, spools, or reels.
- High melting point, excellent corrosion resistance, and good strength-to-ductility balance for demanding service environments.
- Clean, bright finish with controlled surface quality for machining and fabrication.
- Suitable for vacuum, chemical, electronic, medical, and high-temperature applications.
Technical Specifications
| Specification | Value |
| Standard | ASTM B365 Tantalum and Tantalum Alloy Rod and Wire |
| Grade | UNS R05400, UNS R05200, UNS R05252, UNS R05255, UNS R05240 Clean, bright finish, free of defects and surface imperfections |
| Finish | Clean, bright finish, free of defects and surface imperfections |
| Type | Rod and Wire |
| Rod | 0.125 to 2.5 in. (3.18 to 63.50mm) in diameter with round, hexagonal, or octagonal cross section supplied in straight lengths. |
| Wire | 0.010 to 0.124 in. (0.254 to 3.15mm) in diameter furnished in coils or on spools or reels. Material less than 0.010 in. in diameter is not covered by this specification. |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Tests | Chemical analysis, Tensile test, Hardness test, and Microstructural examination |
Applications
- Chemical processing equipment such as heat exchangers, condensers, thermowells, reactor parts, and acid-handling components.
- Electronics, including capacitors, resistors, and sputtering targets.
- Medical technology, including implant components and other biocompatible parts.
- Aerospace and high-temperature hardware where corrosion resistance and thermal stability are required.
- Rod stock for structural parts, electrodes, and machining blanks; wire for fine-gauge components and filaments.
