Hastelloy C276 Round Bars: Composition, Properties, and Industrial Applications
Hastelloy C276 round bars are precision-engineered nickel-based alloy products developed for industrial environments where corrosion resistance, mechanical integrity, and long-term reliability are essential. Designated as UNS N10276 and Werkstoff No. 2.4819, Hastelloy C276 is supplied in accordance with ASTM B574 for demanding applications involving aggressive chemicals, chlorides, acids, and sour-service conditions.
With its balanced nickel base and carefully controlled additions of molybdenum, chromium, and tungsten, Hastelloy C276 delivers exceptional resistance to pitting, crevice corrosion, and stress-corrosion cracking in both oxidizing and reducing media. These capabilities make Hastelloy round bar a cornerstone material for chemical processing, oil and gas, petrochemical, power generation, marine, and pharmaceutical equipment.
Hindco Steel and Alloys is a trusted manufacturer, exporter, supplier, and stockist of high-quality Hastelloy C276 round bars, serving customers across India and international markets. Our products are manufactured and supplied against stringent specifications, supported by rigorous multi-stage quality testing and a robust global supply network.
What Are Hastelloy C276 Round Bars?
Hastelloy C276 is a nickel-molybdenum-chromium superalloy containing tungsten and controlled levels of carbon, silicon, phosphorus, and sulfur. Its composition is designed to provide outstanding resistance to localized corrosion and chemical attack while maintaining dependable strength in severe operating conditions.
Hastelloy C276 round bars are available for machining into shafts, fasteners, valve components, pump parts, fittings, supports, and other precision-engineered industrial components. Depending on the project requirement, bars may be supplied in hot-rolled, cold-drawn, forged, bright-finished, or custom-cut conditions.
Our Hastelloy C276 round bars are supplied for applications where conventional stainless steels and lower-alloy materials cannot provide the required level of corrosion resistance.
Hastelloy C276 Round Bar Specifications
| Property | Specification |
|---|---|
| Alloy | Hastelloy C276 |
| UNS designation | N10276 |
| Werkstoff number | 2.4819 |
| Product standard | ASTM B574 |
| Equivalent pressure-vessel standard | ASME SB574 |
| Product form | Round bar, rod, forged bar, bright bar |
| Typical condition | Solution annealed |
| NACE compliance | NACE MR-01-75 compliant, subject to applicable project requirements and certification |
Solution annealing is essential for achieving a consistent metallurgical structure and maintaining the alloy’s corrosion-resistant performance. Material test certificates can be supplied with chemical, mechanical, dimensional, and heat-treatment details according to customer requirements.
Chemical Composition of Hastelloy C276
The performance of Hastelloy C276 is directly associated with its controlled chemical composition. Molybdenum and tungsten strengthen resistance to localized corrosion, while chromium improves performance in oxidizing environments. The low carbon and silicon content helps reduce the risk of detrimental carbide precipitation during welding and thermal exposure.
| Element | Composition, weight percentage |
|---|---|
| Nickel | Balance |
| Molybdenum | 15.0–17.0% |
| Chromium | 14.5–16.5% |
| Iron | 4.0–7.0% |
| Tungsten | 3.0–4.5% |
| Cobalt | 2.5% maximum |
| Manganese | 1.0% maximum |
| Carbon | 0.01% maximum |
| Silicon | 0.08% maximum |
| Vanadium | 0.35% maximum |
| Phosphorus | 0.04% maximum |
| Sulfur | 0.03% maximum |
The nickel balance provides the alloy’s fundamental stability in aggressive chemical environments. The combined presence of molybdenum and tungsten is particularly important for resisting pitting and crevice corrosion in chloride-bearing media.
Mechanical and Physical Properties
Hastelloy C276 round bars supplied in the solution-annealed condition offer a valuable combination of tensile strength, yield strength, and ductility. These characteristics support reliable performance during machining, fabrication, installation, and service.
Mechanical Properties
| Property | Minimum value |
|---|---|
| Tensile strength | 790 MPa |
| Yield strength, 0.2% offset | 355 MPa |
| Elongation | 40% |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ |
| Melting range | 1325–1370°C |
Actual values may vary according to product diameter, manufacturing route, heat treatment, and applicable purchase specification. For critical applications, procurement teams and engineers should review the certified values on the mill test certificate before final approval.
Additional technical information on the alloy’s corrosion-resistant performance can be reviewed through Haynes International’s Hastelloy C-276 technical resources.
Corrosion Resistance in Severe Environments
The principal advantage of Hastelloy C276 round bar is its exceptional resistance to corrosion across a broad range of industrial media. Unlike many conventional alloys that perform well only in either oxidizing or reducing conditions, C276 is engineered to withstand both environments.
Its key corrosion-resistance capabilities include:
- Exceptional resistance to pitting and crevice corrosion.
- Strong resistance to chloride-induced attack.
- High resistance to stress-corrosion cracking.
- Reliable performance in oxidizing and reducing media.
- Resistance to many aggressive acids and chemical solutions.
- Improved weld-zone corrosion resistance due to low carbon and silicon levels.
- Suitability for demanding sour-service environments when supplied and documented against applicable requirements.
Hastelloy C276 round bars are supplied as NACE MR-01-75 compliant material for applications where resistance to sulfide stress cracking and other sour-service concerns is essential. The final material selection must always consider operating temperature, hydrogen sulfide exposure, pressure, chloride concentration, hardness, heat treatment, and project-specific documentation.
Industrial Applications of Hastelloy C276 Round Bars
Chemical Processing
Chemical processing plants handle acids, chlorides, solvents, and other highly reactive media. Hastelloy C276 round bars are used to manufacture shafts, valve parts, agitator components, fasteners, and pump elements exposed to aggressive process conditions.
Oil and Gas
In oil and gas facilities, Hastelloy C276 is selected for sour-service equipment, refinery components, downhole parts, valve assemblies, and process-system hardware. Its resistance to stress-corrosion cracking and localized corrosion supports long-term reliability in high-consequence environments.
Petrochemical Facilities
Petrochemical plants require alloys capable of maintaining structural integrity under elevated temperatures and chemically aggressive operating conditions. C276 round bars are used in piping components, heat-exchanger parts, reactor equipment, and fabrication assemblies.
Power Generation
Power plants and flue-gas treatment systems may expose components to sulfur-bearing compounds, chlorides, acidic condensates, and oxidizing media. Hastelloy C276 provides dependable service in scrubbers, desulfurization equipment, ash-handling systems, and other corrosion-intensive applications.
Marine and Offshore Systems
Seawater, brine, and chloride-rich atmospheres can cause severe pitting and crevice corrosion in conventional metals. Hastelloy C276 round bars are suitable for selected marine and offshore components where localized corrosion resistance is a primary design requirement.
Pharmaceutical Manufacturing
Pharmaceutical and specialty chemical production demands material purity, cleanability, and corrosion resistance. Hastelloy C276 can be used in process equipment, mixing systems, valves, fasteners, and other components where contamination control and long service life are essential.
Why Choose Hindco Steel and Alloys?
Hindco Steel and Alloys delivers Hastelloy round bar solutions with an unwavering focus on quality, consistency, and customer satisfaction. As a manufacturer, exporter, supplier, and stockist, we support both standard procurement programs and technically demanding custom requirements.
Our capabilities include:
- Hastelloy C276 round bars supplied to ASTM B574 requirements.
- Material identification against UNS N10276 and W.Nr. 2.4819.
- Solution-annealed products for demanding corrosion-service applications.
- Rigorous multi-stage quality testing and inspection.
- Dimensional verification, visual inspection, and documentation support.
- Custom cut lengths and project-specific supply coordination.
- Competitive pricing for domestic and international orders.
- Reliable packaging and global logistics.
- Support for procurement managers, engineers, fabricators, and project leads.
Our round bar product range includes stainless steel, nickel alloys, duplex alloys, super duplex alloys, Inconel, Incoloy, Monel, titanium, and other high-performance materials. This broad portfolio enables us to recommend technically appropriate solutions for diverse industrial requirements.
Conclusion
Hastelloy C276 round bars represent a high-performance solution for applications where corrosion resistance, mechanical strength, and long-term service reliability cannot be compromised. With a nickel balance, 15.0–17.0% molybdenum, 14.5–16.5% chromium, and 3.0–4.5% tungsten, the alloy is engineered to resist pitting, crevice corrosion, and stress-corrosion cracking in severe oxidizing and reducing environments.
From chemical processing and oil and gas to power generation, marine, petrochemical, and pharmaceutical industries, Hastelloy C276 provides enduring value in high-stakes applications. Hindco Steel and Alloys combines international quality benchmarks, stringent inspection practices, extensive product knowledge, and a global supply network to deliver dependable Hastelloy round bar solutions.
For certified Hastelloy C276 round bars, technical specifications, availability, or project-based quotations, contact Hindco Steel and Alloys or email info@hindco.co.in.