Tantalum Tubes Supplier | ASTM B521 Seamless & Welded

Seamless & Welded Tantalum and Tantalum-Tungsten Tubes to ASTM B521

Dinesh Tube India supplies tantalum tubes from Mumbai to heat-exchanger, condenser and bayonet-heater makers, and to chemical and pharmaceutical plants that run the most aggressive acid duties. We supply unalloyed tantalum R05200 and R05400 and the tungsten alloys Ta-2.5W (R05252) and Ta-10W (R05255) as seamless and welded tubes to ASTM B521 / ASME SB521, in straight lengths or cut to size, with EN 10204 3.1 mill test certificates.

Tantalum resists hot hydrochloric, sulphuric and nitric acids, wet chlorine and bromine, where stainless steels and most nickel alloys fail. It also conducts heat well, so thin-walled tantalum tubes give good heat transfer while keeping the amount of this costly metal low. For flat products, see our tantalum sheets and plates page.

Table of Contents

Tantalum Tube Grades
Specification & Sizes
Seamless vs Welded
Chemical Composition
Mechanical Properties
Corrosion Guide
Tantalum vs Zirconium vs Hastelloy
Applications
FAQs

Tantalum Tube Grades

Grade	UNS	Description	Typical Tube Use
Unalloyed tantalum	R05200	Electron-beam or vacuum-arc melted	Heat-exchanger and heater tubes, thermowells
Unalloyed tantalum	R05400	Powder-metallurgy consolidated	Similar uses to R05200
Ta-2.5W	R05252	Tantalum with about 2.5% tungsten	Stronger tubes with good formability
Ta-10W	R05255	Tantalum with about 10% tungsten	High-strength and high-temperature tubes
Ta-40Nb	R05240	Tantalum-niobium alloy	Lower-cost option for some acid services

Tantalum seamless and welded tubes to ASTM B521

Tantalum tubes are thin-walled; schedule pipe sizes are not normally made in solid tantalum. Larger lines are usually built as tantalum-lined or tantalum-clad steel pipe.

Seamless vs Welded Tantalum Tubes

Point	Seamless Tube	Welded Tube
How it is made	Drawn from extruded or deep-drawn hollows	Formed from B708 strip and welded by GTAW or electron beam in inert gas
Typical sizes	Small diameters, capillaries, heavier walls	Thin walls in longer lengths
Typical use	Thermowells, capillaries, high-integrity parts	Heat-exchanger, condenser and heater tube bundles
Cost	Higher	Usually lower for heat-exchanger sizes

Tantalum Tube Chemical Composition (ASTM B521, max %)

Element	R05200	R05400	R05252 (Ta-2.5W)	R05255 (Ta-10W)
Carbon	0.010	0.010	0.010	0.010
Oxygen	0.015	0.030	0.015	0.015
Nitrogen	0.010	0.010	0.010	0.010
Hydrogen	0.0015	0.0015	0.0015	0.0015
Niobium	0.10	0.10	0.50	0.10
Iron / Nickel / Titanium	0.010 each	0.010 each	0.010 each	0.010 each
Tungsten	0.050	0.050	2.0–3.5	9.0–11.0
Tantalum	Balance	Balance	Balance	Balance

Typical limits. Check the current ASTM B521 edition (B521-25) and the mill certificate for governing values.

Tantalum Tube Mechanical Properties (Annealed, Minimum)

Grade	Tensile Strength	Yield Strength (0.2%)	Elongation
R05200 / R05400	207 MPa (30 ksi)	138 MPa (20 ksi)	25%
R05252 (Ta-2.5W)	276 MPa (40 ksi)	193 MPa (28 ksi)	20%
R05255 (Ta-10W)	482 MPa (70 ksi)	414 MPa (60 ksi)	15%
R05240 (Ta-40Nb)	276 MPa (40 ksi)	193 MPa (28 ksi)	20%

Confirm values against ASTM B521 for your order. Tubes are also tested by hydrostatic or pneumatic pressure test and, where specified, eddy-current or ultrasonic inspection.

Why Tantalum for Heat-Transfer Tubes?

Very wide acid resistance: one material covers hot HCl, H₂SO₄, HNO₃, bromine and wet chlorine.
Good heat transfer: tantalum conducts heat far better than glass, so tantalum tubes are much more compact than glass or PTFE exchangers.
Thin walls: walls under 1 mm are common, which keeps the tantalum weight and cost down.
Mechanical strength: unlike glass or graphite, tantalum tubes do not crack under thermal or mechanical shock.

Tantalum Corrosion Guide

Environment	Tantalum
Hydrochloric acid, all concentrations (to about 190 °C)	Excellent
Sulphuric acid, up to about 98% (below about 175 °C)	Excellent
Nitric acid	Excellent
Wet chlorine, bromine, chlorides, ferric and cupric salts	Excellent
Phosphoric acid (low fluoride)	Good
Hydrofluoric acid and fluoride-bearing media	Not suitable
Fuming sulphuric acid (free SO₃)	Not suitable
Hot strong alkalis	Not suitable
Nascent hydrogen (galvanic contact with active metals, cathodic conditions)	Embrittlement risk

General guidance only. Temperature, impurities and galvanic coupling can change behaviour; confirm with corrosion data or tests for your process.

Tantalum vs Zirconium vs Hastelloy C-276 Tubes

Point	Tantalum	Zirconium 702	Hastelloy C-276
Hot HCl	Excellent	Excellent (oxidiser-free)	Fair to good
Hot concentrated H₂SO₄	Excellent	Poor above ~70%	Fair
Oxidising chlorides / wet chlorine	Excellent	Poor	Good
Hot alkalis	Poor	Excellent	Good
Tube standard	ASTM B521	ASTM B523	ASTM B622 / B626
Relative cost	Very high	Medium-high	Medium

Need tantalum tubes? Send the grade, OD, wall, length, seamless or welded, quantity and process media to kamlesh@dineshtube-india.com or call +91 83559 10913. You can also send an enquiry.

Fabrication Notes

Tube-to-tubesheet joints: tantalum tubes are usually welded to a tantalum-clad or tantalum-lined tubesheet, or expanded into a tantalum-faced tubesheet.
Welding: GTAW or electron-beam welding with complete inert-gas shielding or vacuum; tantalum picks up oxygen and nitrogen rapidly above a few hundred °C.
Bending: annealed tantalum is ductile, so U-bends and coils can be cold formed with suitable mandrels.
Galvanic contact: avoid coupling tantalum tubes to more active metals in acid, which can drive hydrogen into the tantalum and embrittle it.
Heat treatment: annealing must be done in high vacuum, never in air.

Chemical process uses of tantalum heat-exchanger and heater tubes

Tantalum Tubes: FAQs

Which standard covers tantalum tubes?

ASTM B521 (ASME SB521) covers seamless and welded tantalum and tantalum alloy tubes. Grades include unalloyed R05200 and R05400, Ta-2.5W (R05252), Ta-10W (R05255) and Ta-40Nb (R05240).

Do you supply tantalum pipes?

Solid tantalum is made as thin-walled tube rather than schedule pipe, because of its cost. Small lines use ASTM B521 tantalum tube; larger process lines are usually tantalum-lined or tantalum-clad steel pipe. Send your line size and duty and we will advise what can be supplied.

Should I choose seamless or welded tantalum tube?

Welded tube made from B708 strip is the usual choice for heat-exchanger, condenser and heater bundles, because it is available in thin walls and long lengths at lower cost. Seamless tube is used for capillaries, thermowells and other high-integrity parts.

Can tantalum tubes be supplied U-bent?

Annealed tantalum is ductile and can be cold bent into U-bends and coils for heat exchangers and heaters. Send the bend radius, leg lengths and tube size for a check.

Is tantalum better than zirconium for heat-exchanger tubes?

Tantalum covers a wider range of acids, including hot concentrated sulphuric acid and oxidising chlorides where zirconium fails. Zirconium is cheaper and better in hot alkalis. The right choice depends on the exact process media and temperature.

What is tantalum tube not resistant to?

Tantalum is attacked by hydrofluoric acid and fluoride-bearing solutions, by fuming sulphuric acid containing free SO3, and by hot strong alkalis. It can also absorb hydrogen and become brittle if it is galvanically coupled to more active metals or exposed to hydrogen at high temperature.

What is the price of tantalum tubes?

Tantalum is one of the most expensive engineering metals. The tube price depends on grade, OD, wall, length, seamless or welded, quantity and current metal prices. Send your requirement to kamlesh@dineshtube-india.com or call +91 83559 10913 for a current quote.

Which certificates come with tantalum tubes?

Every supply comes with an EN 10204 3.1 mill test certificate showing lot number, chemical analysis, mechanical properties and test results to ASTM B521. EN 10204 3.2 certificates and third-party inspection can be arranged on request.

Export Destinations for Tantalum Tubes

We supply tantalum tubes across India, including pharmaceutical and chemical clusters in Gujarat, Maharashtra, Telangana and Andhra Pradesh, and export to the Middle East (UAE, Saudi Arabia, Qatar, Oman), South and South-East Asia (Bangladesh, Sri Lanka, Singapore, Malaysia, Vietnam, Cambodia), Africa (Egypt, South Africa) and Europe on request.

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