Hastelloy C276 Chemical Resistance and Material Selection – UNS N10276

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Secondary Keywords: Hastelloy C276 corrosion resistance, UNS N10276 chemical resistance, Alloy C-276 corrosion properties, Hastelloy C276 acid resistance, nickel molybdenum chromium alloy, Hastelloy C276 industrial applications, Hastelloy C276 round bar

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Table of Contents

  1. Understanding Hastelloy C276 Chemical Resistance
  2. Why UNS N10276 Is Used in Corrosive Environments
  3. Chemical Environments and Performance
  4. Factors Affecting Corrosion Resistance
  5. Industrial Applications
  6. How to Select the Correct Material
  7. Frequently Asked Questions
  8. Enquire with Manan Steel & Metals

1. Understanding Hastelloy C276 Chemical Resistance

Hastelloy C276, also known as Alloy C-276 and UNS N10276, is a nickel-chromium-molybdenum alloy developed for demanding corrosive environments. Its composition includes molybdenum and tungsten, which contribute to its resistance to many aggressive chemical media.

The alloy is used in selected chemical-processing equipment, reactors, heat exchangers, piping systems, valves and pumps where corrosion can affect equipment reliability and service life. Haynes International documents its resistance to a broad range of corrosive chemicals and chloride-related localized corrosion.

However, no alloy is universally resistant to every chemical under every operating condition. Correct material selection requires the chemical concentration, temperature, impurities, exposure time and mechanical requirements to be considered together.

2. Why UNS N10276 Is Used in Corrosive Environments

Resistance to a wide range of acids

Hastelloy C276 is used in selected environments containing acids such as hydrochloric acid and sulfuric acid. Its performance varies with concentration and temperature, so the exact operating conditions must be checked against reliable corrosion data.

Resistance to localized corrosion

Pitting and crevice corrosion can cause localised material damage even when the overall surface appears sound. C276 has strong resistance to these forms of attack in many chloride-bearing environments, making it a candidate for selected chemical-processing applications.

Resistance to stress-corrosion cracking

Stress-corrosion cracking can occur when susceptible materials are exposed to particular chemicals while under tensile stress. C276 is valued for its resistance to chloride-induced stress-corrosion cracking under appropriate conditions.

Suitability for fabricated components

The alloy can be formed and welded using suitable procedures. Material selection must account for the completed component, including welds, heat-affected zones, fabrication practices and service conditions.

3. Chemical Environments and Hastelloy C276 Performance

The following table is a general screening guide—not a guarantee of compatibility.

Chemical environmentMaterial-selection consideration
Hydrochloric acidEvaluate concentration, temperature, impurities and exposure conditions
Sulfuric acidCorrosion performance changes with concentration and temperature
Chloride-containing solutionsConsider pitting, crevice corrosion and stress-corrosion cracking
Mixed industrial process chemicalsReview every significant constituent and possible contaminants
Oxidizing and reducing mediaConfirm whether the specific chemistry is suitable for C276
Wet gas-treatment environmentsAssess condensates, chlorides, deposits and operating temperatures

Haynes International publishes laboratory corrosion data for specific chemicals, concentrations and temperatures. These data can help engineers screen materials, but actual process conditions may differ from laboratory conditions. Field evaluation and engineering review may therefore be necessary.

Technical reference: HASTELLOY C-276 technical information and corrosion data.

4. Factors Affecting Hastelloy C276 Corrosion Resistance

Chemical concentration

The same chemical can behave differently at different concentrations. A material that performs well in one solution may experience substantially different corrosion rates in another.

Operating temperature

Higher temperatures can accelerate many corrosion reactions and change the behaviour of the chemical environment. Always verify the expected operating and upset temperatures.

Impurities and mixed chemicals

Dissolved salts, oxidizing contaminants, deposits and mixtures of process chemicals may change corrosion behaviour. A datasheet for a pure chemical solution may not represent the actual process.

Flow and equipment geometry

High flow velocities, deposits, stagnant regions and narrow crevices can affect local corrosion. The design of the component is therefore as important as the alloy designation.

Fabrication and welding

Welding, forming, machining and finishing must follow appropriate procedures. Weld condition and fabrication quality should be considered when evaluating the finished equipment’s corrosion performance.

5. Industrial Applications of Hastelloy C276

Hastelloy C276 is used in selected applications across industries where corrosive process conditions create demanding material requirements.

Chemical processing: Reactors, heat exchangers, columns, reboilers and other equipment exposed to aggressive chemicals.

Pollution control: Selected scrubbers and gas-treatment equipment where corrosive condensates or process streams are present.

Petrochemical operations: Components exposed to particular corrosive process fluids, subject to application-specific qualification.

Industrial fluid handling: Selected pipes, fittings, valves and pump components requiring corrosion resistance.

Machined parts: Round-bar stock can be used to manufacture specified shafts, pins and other components where the design calls for UNS N10276.

The correct product form and specification depend on the component and engineering requirements. See Haynes International’s chemical-processing information.

6. How to Select the Correct Material

Before specifying Hastelloy C276, engineers and purchasing teams should confirm the following:

  1. Identify the process chemistry. List chemicals, concentrations, impurities and potential contaminants.
  2. Document the temperature. Include normal operation, start-up, shutdown and foreseeable upset conditions.
  3. Assess mechanical requirements. Confirm pressure, stress, wear and design-life requirements.
  4. Select the correct product form. Specify round bar, plate, sheet, pipe, tube or another required form.
  5. Confirm the governing standard. For applicable bar and rod products, ASTM B574 may be relevant; verify the exact standard required for the order.
  6. Specify documentation. Identify material test certificates, traceability and inspection requirements.
  7. Obtain engineering confirmation. For critical equipment, validate compatibility using suitable corrosion data and qualified materials expertise.

These checks help avoid choosing an alloy solely because it is described as corrosion-resistant.

7. Frequently Asked Questions

Is Hastelloy C276 resistant to hydrochloric acid?

C276 is used in selected hydrochloric-acid environments, but its corrosion rate depends on concentration, temperature, impurities and other conditions. Review the relevant technical corrosion data before specifying it.

Does Hastelloy C276 resist pitting and crevice corrosion?

It exhibits strong resistance to chloride-induced pitting and crevice corrosion in many tested conditions. Actual performance depends on the service environment and component design.

What is the UNS designation for Hastelloy C276?

The UNS designation is N10276. Alloy C-276 is another commonly used name.

Can Hastelloy C276 be used in every chemical-processing plant?

No. Suitability must be established for the actual process chemistry, operating temperature, component design and applicable standards.

How do I request a Hastelloy C276 quotation?

Provide the material designation, product form, dimensions, quantity, applicable standard, documentation requirements and delivery location.

8. Enquire with Manan Steel & Metals

Manan Steel & Metals welcomes industrial enquiries for specialty-alloy requirements, including Hastelloy C276 / UNS N10276.

If your project requires C276 round bar or another specified product form, send your dimensions, quantity and technical requirements for a quotation.

Manan Steel & Metals

Send your Hastelloy C276 requirement today with the grade, dimensions, quantity and delivery location.

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