Pure Tantalum R05200
UNS R05200
Electron-beam melted pure tantalum — maximum ductility and corrosion resistance. Liners for HCl and H₂SO₄ plant, bayonet heaters, heat-exchanger coils, repair plugs and patches.
Tantalum & Speciality Metals — Ultimate Acid Service Materials
Tantalum, tantalum-tungsten alloys, zirconium 702, niobium, bismuth, zinc and lead — the refractory and speciality metals for hot concentrated acids, high-temperature furnace duty, radiation shielding and nuclear-grade service.
Tantalum & Speciality Metals — Material Overview
Tantalum is the most corrosion-resistant engineering metal in common use: inert to hydrochloric and sulphuric acids at concentrations and temperatures that attack every stainless and nickel alloy. It is used as thin liners, heat-exchanger coils and repair patches that outlast the plant around them. Ta-2.5W adds strength for fasteners and springs; Ta-10W adds high-temperature strength for furnace parts.
Zirconium 702 is the acid-proof, HF-free chemical-plant metal — outstanding in acetic, sulphuric (up to ~70%) and urea service. Niobium behaves like a lighter, lower-cost tantalum in selected media and adds high-temperature and superconducting applications. The dense non-ferrous metals — bismuth, zinc and lead — cover shielding, ballast, cathodic-protection anode and acid-lining duties. All are supplied with full chemistry and traceability.
8grades listed
16,600 kg/m³typical density (Ta 16.6 – 16.9; Zr 6.51; Nb 8.57; Bi 9.78; Zn 7.14; Pb 11.34)
5product forms
Available Grades
The grades below are the ones most often asked for. Each grade stays on this page — the material-first way to browse.
Tantalum Ta-2.5W R05252
UNS R05252
Tantalum with 2.5% tungsten — the strength upgrade of pure tantalum with the same corrosion behaviour. Bolts, springs, machined parts and vessels with thinner walls.
Tantalum Ta-10W R05255
UNS R05255
Tantalum with 10% tungsten — high strength retained to very high temperatures. Furnace hardware, heating elements supports and rocket-engine components.
Zirconium 702 R60702
UNS R60702
Commercial-pure zirconium — outstanding in acetic acid, urea and sulphuric acid (HF-free) duty, and the standard nuclear-grade metal. Vessels, exchangers, columns and fasteners.
Niobium R04200
UNS R04200
Pure niobium (columbium) — a lower-density, lower-cost refractory metal with tantalum-like corrosion behaviour in many media. High-temperature parts and chemical duty.
Bismuth
Dense, non-toxic heavy metal (9.78 g/cm³, melting 271 °C) — the lead-free choice for radiation shielding, ballast weights, fusible low-melt alloys, solders and free-machining stock. Supplied as ingot, shot, bar and machined parts.
Zinc
Corrosion-sacrifice metal — anodes for cathodic protection of pipelines, hulls and tanks; also galvanising stock, roofing and architectural sheet, and battery and die-casting feedstock. Supplied as anodes, sheet, rod and ingot.
Lead
Heavy, dense, workable metal (11.34 g/cm³) — radiation shielding, counterweights and ballast, chemical-plant linings for sulphuric acid service, sound and vibration insulation. Supplied as sheet, pipe, rod and cast shapes.
Chemical Composition (indicative)
Nominal ranges as published in the common product standards. Values are indicative and for comparison only — always purchase against the current ASTM/EN specification and the mill test certificate.
Pure Tantalum R05200
| Element | Content |
|---|---|
| Tantalum (Ta) | ≥ 99.9 (EB-melted) |
| Niobium (Nb) | ≤ 0.10 |
| Iron (Fe) / Titanium (Ti) / Silicon (Si) | ≤ 0.010 / 0.010 / 0.005 |
Tantalum Ta-2.5W R05252
| Element | Content |
|---|---|
| Tantalum (Ta) | bal. |
| Tungsten (W) | 2.0 – 3.5 |
| Niobium (Nb) / Iron (Fe) | ≤ 0.10 / ≤ 0.010 |
Tantalum Ta-10W R05255
| Element | Content |
|---|---|
| Tantalum (Ta) | bal. |
| Tungsten (W) | 9.0 – 11.0 |
| Niobium (Nb) / Iron (Fe) | ≤ 0.10 / ≤ 0.010 |
Zirconium 702 R60702
| Element | Content |
|---|---|
| Zirconium + Hafnium (Zr+Hf) | ≥ 99.2 |
| Hafnium (Hf) | ≤ 4.5 |
| Iron + Chromium (Fe+Cr) | ≤ 0.20 |
| Oxygen (O) / Nitrogen (N) / Carbon (C) / Hydrogen (H) | ≤ 0.16 / 0.025 / 0.05 / 0.005 |
Niobium R04200
| Element | Content |
|---|---|
| Niobium (Nb) | ≥ 99.8 |
| Tantalum (Ta) | ≤ 0.10 |
| Residuals | per ASTM B392 / B393 limits |
Mechanical Properties (indicative)
Typical minimum values for the common product forms in the annealed / solution-treated condition. Actual properties depend on product form, specification revision and heat treatment.
Pure Tantalum R05200
| Property | Value |
|---|---|
| Tensile strength (annealed) | ≈ 210 – 290 MPa |
| Yield strength (annealed) | ≈ 140 – 170 MPa |
| Elongation | ≥ 25 % |
| Density | 16.6 g/cm³ |
Tantalum Ta-2.5W R05252
| Property | Value |
|---|---|
| Tensile strength (annealed) | ≈ 275 – 345 MPa |
| Yield strength (annealed) | ≈ 195 – 250 MPa |
| Elongation | ≥ 20 % |
| Density | 16.7 g/cm³ |
Tantalum Ta-10W R05255
| Property | Value |
|---|---|
| Tensile strength (annealed) | ≈ 480 – 620 MPa |
| Yield strength (annealed) | ≈ 345 – 450 MPa |
| Elongation | ≥ 10 – 15 % |
| Density | 16.8 – 16.9 g/cm³ |
Zirconium 702 R60702
| Property | Value |
|---|---|
| Tensile strength (min per ASTM B551) | ≥ 379 MPa |
| Yield strength (min per ASTM B551) | ≥ 207 MPa |
| Elongation | ≥ 16 % |
| Density | 6.51 g/cm³ |
Niobium R04200
| Property | Value |
|---|---|
| Tensile strength (annealed) | ≈ 125 – 175 MPa |
| Yield strength (annealed) | ≈ 70 – 105 MPa |
| Elongation | ≥ 25 % |
| Density | 8.57 g/cm³ |
Bismuth
| Property | Value |
|---|---|
| Density | 9.78 g/cm³ |
| Melting point | 271 °C |
Zinc
| Property | Value |
|---|---|
| Density | 7.14 g/cm³ |
| Melting point | ≈ 420 °C |
Lead
| Property | Value |
|---|---|
| Density | 11.34 g/cm³ |
| Melting point | ≈ 327 °C |
Physical Properties
| Property | Value |
|---|---|
| Density (Ta / Ta-10W) | 16.6 / ≈ 16.9 g/cm³ |
| Density (Zr 702 / Nb) | 6.51 / 8.57 g/cm³ |
| Density (Bi / Zn / Pb) | 9.78 / 7.14 / 11.34 g/cm³ |
| Melting point (Ta / Zr / Nb) | ≈ 2996 / 1852 / 2468 °C |
| Corrosion (Ta) | Inert to HCl and H₂SO₄ at nearly all concentrations |
| Thermal conductivity (Ta, RT) | ≈ 57 W/m·K |
Available Product Forms
Tantalum & Speciality Metals is offered in the product forms below. Availability varies by grade and size — confirm the exact combination with our sales desk.
Sheets, Plates & Coils
Hot-rolled and cold-rolled sheets, plates, coils, circles and flats in standard and cut sizes.
Pipes & Tubes
Seamless and welded pipes and tubes to ASTM/ASME, IS and BS specifications — including boiler, air-preheater and corten tubes.
Pipe Fittings
Butt-weld, forged and socket-weld fittings — elbows, tees, reducers, caps, stub ends, olets and nipples.
Bars, Rods & Wires
Bright and black round bars, square and hex bars, flats and wires in stainless, duplex, alloy, carbon and nickel-alloy grades.
Fasteners
Bolts, nuts, studs, washers and threaded rods in alloy and stainless grades.
Industrial Applications
- HCl and H₂SO₄ heat exchangers, coils and bayonet heaters (Ta)
- Reactor linings, agitators and thermowells (Ta)
- Repair plugs, patches and weld overlay for glass-lined vessels (Ta)
- High-temperature furnace parts and supports (Ta-10W)
- Acetic acid, urea and HF-free chemical plant (Zr 702)
- High-temperature and superconducting components (Nb)
Applicable Standards
| Standard | Scope |
|---|---|
| ASTM B521 | Tantalum and tantalum-alloy seamless and welded tube |
| ASTM B708 | Tantalum and tantalum-alloy plate, sheet and strip |
| ASTM B365 | Tantalum rod and wire |
| ASTM B493 / B550 / B551 | Zirconium forgings, bar/rod and sheet/plate |
| ASTM B391 / B392 / B393 | Niobium ingot, bar/rod/wire and related product |
| ASME SB-521 / SB-708 | Boiler & Pressure Vessel Code cased tantalum |
Quality & Documentation
Speciality metals are supplied to ASTM specifications with ASME code-cased equivalents where applicable. Electron-beam melted tantalum ships with full chemical analysis including interstitials (O, N, H), heat traceability and EN 10204 Type 3.1 or 3.2 documents. Zirconium is supplied to the specified hafnium level (nuclear or commercial) as ordered.
Related Engineering Calculators
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Material Density & Weight Estimator
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Unit Conversion Calculator
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Frequently Asked Questions
Why use tantalum when it is so expensive?
Because in hot concentrated HCl and H₂SO₄ nothing else lasts. Tantalum is used as a thin (typically 0.5 – 1.5 mm) liner or coil on cheaper substrate — the metal cost is a fraction of the vessel, the plant stays running, and tantalum scrap retains high value at decommissioning.
Tantalum, Ta-2.5W or Ta-10W — how do I choose?
Pure tantalum for maximum corrosion resistance and ductility (liners, coils). Ta-2.5W where the part carries load — fasteners, springs, machined components — at essentially the same corrosion behaviour. Ta-10W for high-temperature strength above ~1500 °C.
How is tantalum installed and repaired?
It welds readily in clean inert-gas shielding. Iron contamination must be avoided — steel tooling marks embrittle tantalum — so handling, storage and welding practice matter. We supply material and guidance to the fabricator.
Zirconium 702 or 705?
702 is commercially pure and the better choice for the best corrosion resistance and welding behaviour; 705 (Zr-Nb alloy) gives higher strength for demanding pressure parts. For most acid service 702 is the specified grade.
Can niobium replace tantalum?
In many oxidising and moderate media, yes — niobium behaves similarly at lower cost and weight. In hot concentrated hydrochloric acid tantalum remains the only reliable choice. Tell us the medium, concentration and temperature and we will advise.
Need Tantalum & Speciality Metals Priced?
Send the grade, product form, size and quantity — our sales desk replies with an offer and lead time within one business day.