Hastelloy C276 Pipe & Tube | ASTM B622 UNS N10276

This page is the main commercial product page for Hastelloy C276 / Alloy C276 pipe and tube in UNS N10276 and W.Nr. 2.4819.

It covers seamless pipe and tube, welded pipe, welded tube, straight lengths, cut lengths, and project-specific tubular products for chemical processing, pollution control, oil and gas, heat exchangers, waste treatment, and other severe corrosive services.

This is not a medical-tubing-only page. Medical, implant, surgical, pharmaceutical, or high-purity applications require separate dimensional, cleanliness, regulatory, validation, and customer-approval requirements.

1. Material: Alloy C276.

2. Common Search Name: Hastelloy C276.

3. UNS Designation: UNS N10276.

4. Werkstoff Number: W.Nr. 2.4819.

5. Material Family: Nickel-chromium-molybdenum-tungsten corrosion-resistant alloy.

6. Primary Product Forms: Seamless pipe, seamless tube, welded pipe, welded tube, straight lengths, cut pieces, and project-specific tubular components.

7. Trademark Note: HASTELLOY® is a registered trade name. Purchase documents should identify the required UNS number, product form, standard, condition, dimensions, testing, and documentation rather than relying only on a trade name.

The RFQ should state the exact standard and edition, pipe or tube, seamless or welded construction, dimensions, wall basis, length, condition, testing, certificates, and supplementary requirements. Standards are not interchangeable merely because each may include UNS N10276.

The values below describe the common Alloy C276 composition direction. Final acceptance must follow the governing product standard and heat-specific MTR/MTC.

Heat-specific chemistry must remain linked to the supplied pipe or tube through heat and lot identification. A website table does not replace the Material Test Report.

Mechanical requirements depend on the ordered product standard, construction, delivery condition, dimensions, and specimen orientation.

For solution-annealed UNS N10276 seamless pipe and tube under ASTM B622, commonly referenced minimum room-temperature values are:

These values should not be applied automatically to every welded, cold-worked, formed, heat-treated, thin-wall, or finished component. Final acceptance follows the ordered standard and heat-specific certificate.

Typical values only; they are not product-acceptance limits.

Actual values vary with temperature, heat chemistry, processing history, and test method.

Alloy C276 is commonly reviewed where equipment may encounter both oxidizing and reducing chemicals, chlorides, wet halides, contaminated acids, sour fluids, or localized-corrosion risks.

Its high molybdenum content supports resistance in many reducing environments, chromium contributes to performance in oxidizing media, and tungsten supports resistance to localized attack. Low carbon and silicon contents help reduce weld-related sensitization concerns.

These characteristics do not make Alloy C276 universally corrosion-proof. Performance remains dependent on chemistry, concentration, temperature, pressure, aeration, redox potential, contaminants, deposits, velocity, crevices, weld quality, cleaning chemicals, and shutdown conditions.

ASTM G48 testing can be useful for comparative screening of pitting and crevice-corrosion resistance in ferric-chloride solutions.

Critical pitting or crevice temperatures obtained from laboratory testing should not be treated as universal operating-temperature limits. They do not reproduce every process fluid, flow condition, weld, deposit, crevice, stress state, cleaning cycle, or shutdown condition.

Project selection should combine published data with actual process chemistry, corrosion coupons, laboratory tests, pilot testing, or relevant service experience when failure risk is high.

Seamless and welded products should not be quoted as interchangeable unless the design and purchase specification permit both constructions.

Supply can be reviewed for:

1. Seamless round pipe and tube.

2. Longitudinally welded pipe.

3. Welded heat-exchanger, condenser, and general-corrosion tube.

4. Straight lengths, random lengths, fixed lengths, and cut pieces.

5. Plain, beveled, faced, chamfered, or drawing-specific ends.

6. Annealed and descaled, pickled, bright, polished, or project-specific surfaces.

7. Cutting, bending, flaring, expanding, swaging, machining, threading, and fabrication review when technically applicable.

8. Customer marking, heat separation, inspection hold points, and export packaging.

1. State NPS or OD, wall thickness or schedule, length, and quantity.

2. Confirm whether the order is pipe or tube and whether it is seamless or welded.

3. Identify nominal, average, or minimum-wall requirements where applicable.

4. OD, wall, ovality, straightness, cut length, end condition, and surface tolerances follow the governing standard unless tighter values are agreed in writing.

5. Tighter tolerances require review of manufacturing route, size, wall, length, surface, measurement method, sampling, yield, cost, and lead time.

6. Do not apply one universal size range, schedule range, maximum length, or precision tolerance to every product form.

Wrought Alloy C276 products are normally supplied in a solution-annealed or mill-annealed condition according to the product standard and order.

The final thermal route depends on product form, prior cold work, hot forming, weld process, section size, corrosion requirement, and customer specification.

Hot-formed products and heavily cold-formed components may require renewed solution annealing and rapid cooling to restore the intended corrosion resistance and ductility.

A generic stress-relief or post-weld heat-treatment cycle should not be applied to every pipe or tube without metallurgical and project review.

Alloy C276 can be welded and fabricated using procedures suitable for nickel-chromium-molybdenum alloys.

Important controls include:

1. Clean joint surfaces and protection from sulfur, lead, zinc, oils, paints, and marking compounds.

2. Correct filler metal and qualified welding procedure.

3. Controlled heat input, interpass temperature, joint design, shielding, and purge.

4. Weld and heat-affected-zone inspection appropriate to the service.

5. Post-weld cleaning and oxide removal.

6. Review of forming strain, work hardening, springback, wall thinning, ovality, and dimensional recovery.

Low carbon and silicon contents reduce some weld-related corrosion concerns, but they do not make every weld procedure automatically acceptable.

Inspection can be arranged according to the governing standard and purchase order, including:

1. Heat-specific chemical composition and mechanical-property verification.

2. OD, wall thickness, length, straightness, ovality, end preparation, and surface inspection.

3. Hydrostatic or nondestructive electric testing as required by the applicable standard.

4. Eddy-current, ultrasonic, pneumatic, leak, radiographic, or dye-penetrant testing when technically applicable and specified with acceptance criteria.

5. Positive Material Identification when ordered.

6. Hardness, corrosion, microstructure, flattening, flaring, bend, or additional testing when applicable.

7. Third-party inspection at agreed witness or hold points.

A statement such as “100% tested” is incomplete unless the method, coverage, calibration, sensitivity, frequency, acceptance criteria, and report scope are defined.

Available documentation can include:

1. Heat-specific MTR/MTC showing UNS number, product standard, chemistry, mechanical properties, condition, construction, and heat number.

2. Heat and lot traceability linked to pipe or tube marking, labels, packing lists, and inspection reports.

3. EN 10204 3.1 documentation when contractually required.

4. Dimensional, PMI, hydrostatic, ET, UT, RT, PT, hardness, corrosion, or third-party reports when ordered.

5. Certificate of Conformance and project-specific release documents.

6. ASME, PED, ISO 15156/NACE, or regulated-project documentation only when the exact contractual requirements have been reviewed and confirmed.

Alloy C276 pipe and tube may be evaluated for:

1. Chemical-process transfer lines, reactors, columns, scrubbers, and associated piping.

2. Hydrochloric, sulfuric, phosphoric, and mixed-acid systems after full chemistry review.

3. Pollution-control, flue-gas-desulfurization, absorber, and waste-treatment equipment.

4. Pulp and paper bleaching, chlorine-dioxide, and wet-halide systems.

5. Oil-and-gas, sour-service, produced-water, and offshore process equipment where applicable project requirements are satisfied.

6. Heat exchangers, condensers, evaporators, coolers, and U-bend tube projects under the correct tube standard.

7. Pharmaceutical, fine-chemical, and high-purity process equipment only after cleanliness, finish, fabrication, validation, and regulatory requirements are defined.

8. Mining, hydrometallurgy, metal pickling, acid recovery, and leaching systems.

9. Marine, brine, geothermal, and desalination systems after localized-corrosion, fouling, and galvanic review.

These examples are application-screening directions and do not replace corrosion engineering or end-user approval.

Alloy C276 should be compared with Alloy C22, Alloy 625, Alloy 825, Alloy 20, titanium, duplex stainless steel, or other materials when service conditions justify a broader review.

Selection should not be based only on:

1. The words “Hastelloy” or “nickel alloy.”

2. A single PREN calculation.

3. One ASTM G48 result.

4. A generic maximum temperature.

5. Initial material price.

6. A catalogue corrosion chart without actual chemistry and temperature.

7. An assumption that more alloying always provides lower lifecycle cost.

For a broader technical overview, see Hastelloy C-276 composition, properties, and application guidance.

1. Pipe and tube can be bundled, wrapped, sleeved, or packed in export wooden cases according to size, wall, length, surface, and transport method.

2. Ends can receive caps, bevel protectors, or project-specific protection.

3. Thin-wall or polished tubes can receive separators and additional surface protection.

4. Moisture-resistant wrapping and secure supports can be used for export shipment.

5. Different heats, lots, sizes, standards, constructions, and conditions can be separated and identified.

6. Marking can include Alloy C276, UNS N10276, standard, seamless or welded construction, size, wall, heat number, lot number, quantity, and purchase-order reference.

1. More than 20 years of alloy-material production and export experience.

2. Supply support for standard and project-specific nickel-alloy pipe and tube requirements.

3. Review of grade, UNS number, product form, construction, standard, size, wall basis, condition, tolerances, processing, inspection, documentation, and packing before quotation.

4. Heat and lot traceability according to agreed purchase requirements.

5. PMI, dimensional, surface, mechanical, hydrostatic, eddy-current, ultrasonic, radiographic, leak, and third-party inspection support when specified and technically applicable.

6. Cutting, end preparation, bending, marking, heat separation, and export packaging subject to feasibility confirmation.

7. Direct communication for drawings, process chemistry, inspection plans, delivery requirements, and technical clarification.

For an accurate quotation, please provide:

1. Alloy C276 / UNS N10276 confirmation.

2. ASTM B622, ASTM B619/B619M, ASTM B626, ASME SB specification, EN, or customer specification and edition.

3. Pipe or tube and seamless or welded construction.

4. NPS or OD, schedule or wall thickness, length, quantity, and dimensional tolerance.

5. Average-wall or minimum-wall requirement where applicable.

6. Delivery condition, surface finish, cleanliness, end preparation, bending, or fabrication requirements.

7. Operating and design temperature, pressure, vacuum, surge, fatigue, and vibration.

8. Process fluid, concentration, pH, chlorides, fluorides, sulfur compounds, oxidizers, solids, impurities, and flow velocity.

9. Startup, shutdown, upset, cleaning, and maintenance conditions.

10. Hydrostatic, electric, ET, UT, RT, PT, PMI, hardness, corrosion, dimensional, or third-party inspection requirements.

11. MTR/MTC, EN 10204 3.1, CoC, ISO 15156/NACE, ASME, PED, or customer-specific documents.

12. Destination, Incoterms, packaging, marking, and required delivery date.

Which standard covers seamless Alloy C276 pipe and tube?
ASTM B622 covers seamless nickel and nickel-cobalt alloy pipe and tube, including UNS N10276.

Which standard covers welded Alloy C276 pipe?
ASTM B619/B619M covers welded nickel and nickel-cobalt alloy pipe, including UNS N10276.

Which standard covers welded Alloy C276 tube?
ASTM B626 covers welded nickel-alloy tube for heat exchangers, condensers, and general corrosive service, including UNS N10276.

Are pipe and tube the same product?
No. Pipe is commonly ordered by NPS and schedule, while tube is commonly ordered by outside diameter and wall thickness. The governing standard and dimensional basis must be stated.

Can seamless and welded Alloy C276 be substituted?
Only when the design and purchase specification permit the proposed construction and all dimensional, mechanical, testing, fabrication, and documentation requirements are satisfied.

Is Alloy C276 suitable for hydrochloric acid?
It is frequently evaluated for hydrochloric-acid service, but concentration, temperature, aeration, oxidizing contaminants, velocity, impurities, and service evidence must be reviewed.

Does a high ASTM G48 result guarantee service performance?
No. ASTM G48 is a laboratory screening method and does not reproduce every process environment, weld, stress, deposit, crevice, flow, or cleaning condition.

Is Alloy C276 automatically NACE compliant?
No. The applicable ISO 15156/NACE edition, product form, condition, hardness, environment, design, and end-user approval must be confirmed.

Which documents can be supplied?
Heat-specific MTR/MTC, heat and lot traceability, EN 10204 3.1 documentation, and ordered inspection reports can be supplied according to the contract.