If you work in chemical processing, oil & gas, or any industry where metal has to survive brutal environments — you've probably heard the name Hastelloy C276 Round Bar. And if you haven't? You're about to understand why engineers swear by it.
This guide breaks down everything about c276 material — what it is, where it's used, why it outperforms other alloys, and what to look for when buying a nickel alloy bar for your next project.
No jargon. No fluff. Just straight-up facts. Let's get into it.
What is Hastelloy C276 Round Bar?
Hastelloy C276 Round Bar is a solid cylindrical bar made from a nickel-molybdenum-chromium alloy — commonly known as c276 material or UNS N10276. It belongs to the Hastelloy family of super alloys manufactured specifically to resist corrosion, oxidation, and high-temperature degradation.
Think of it as a metal that laughs in the face of acids, chlorides, and extreme heat — conditions that would destroy stainless steel or carbon steel in days.
Quick Composition Overview
| Element | Symbol | Percentage (%) |
|---|---|---|
| Nickel | Ni | Balance (~57%) |
| Molybdenum | Mo | 15 – 17% |
| Chromium | Cr | 14.5 – 16.5% |
| Iron | Fe | 4 – 7% |
| Tungsten | W | 3 – 4.5% |
| Cobalt | Co | Max 2.5% |
The high molybdenum and chromium content is the secret sauce — they create a naturally passive surface layer that blocks corrosive attacks.
Key Properties of C276 Material
Before you buy any nickel alloy bar, you need to understand what makes c276 material stand out. Here are the properties that matter most:
- 1. Exceptional Corrosion Resistance – Resists hydrochloric acid (HCl), sulfuric acid, chlorine environments, hypochlorite, formic/acetic acids.
- 2. Outstanding Resistance to Pitting & Crevice Corrosion – One of highest PREN values among nickel alloys, ideal for seawater/chloride-heavy service.
- 3. Wide Temperature Range – From cryogenic up to 1038°C (1900°F).
- 4. Excellent Fabricability – Weldable, machinable, cold/hot worked, forged.
- 5. ASME & ASTM Compliance – Manufactured per ASTM B574 / ASME SB-574.
Always verify the Hastelloy C276 Round Bar you purchase has a traceable heat number and mill test certificate. This is crucial for pressure vessel, nuclear, and pharmaceutical applications.
Hastelloy C276 Round Bar — Standard Specifications
| Specification | Details |
|---|---|
| UNS Number | N10276 |
| ASTM Standard | ASTM B574 |
| ASME Standard | ASME SB-574 |
| Common Name | Hastelloy C276, c276 material |
| Density | 8.89 g/cm³ |
| Melting Point | 1325 – 1370°C |
| Max Service Temp | 1038°C (1900°F) |
| Hardness (Brinell) | ~209 HB |
| Tensile Strength | 785 MPa (min) |
| Yield Strength | 365 MPa (min) |
Top Industries Using Hastelloy C276 Round Bar
1. Chemical Processing Industry – Reactor vessels, agitators, heat exchangers, pump shafts, valve stems.
2. Oil & Gas Industry – Downhole tools, subsea equipment, offshore components, flue gas desulfurization.
3. Pulp & Paper Industry – Digesters, bleach washers, stock chests.
4. Waste Treatment & Environmental – Incineration, hazardous waste, flue gas scrubbers.
5. Pharmaceutical & Food Processing – Reactor linings, piping, mixing equipment (FDA-compliant).
6. Marine & Desalination – Desalination plants, marine heat exchangers, offshore platforms.
Benefits of Choosing Hastelloy C276 Round Bar
| Property | Hastelloy C276 | SS 316L |
|---|---|---|
| Pitting Resistance (PREN) | ~70 | ~23 |
| Chloride Tolerance | Excellent | Poor |
| Max Service Temp | 1038°C | 870°C |
| HCl Resistance | Excellent | Very Poor |
| Weldability | Good | Excellent |
| Lifespan in Harsh Media | Very Long | Short to Medium |
Yes, Hastelloy C276 Round Bar costs more upfront than stainless steel — but in aggressive environments, it outlasts stainless 5x to 10x, dramatically reducing replacement costs, downtime, and maintenance overheads. Total cost of ownership is actually lower.
What to Check When Buying Hastelloy C276 Round Bar
- Mill Test Report (MTR) with chemical & mechanical properties
- ASTM B574 / ASME SB-574 compliance certificate
- UNS N10276 designation confirmed
- Heat number traceability
- Third-party inspection if required (SGS, Bureau Veritas, TUV)
- Dimensional tolerance as per required standards
- Availability in required sizes (diameter range)
Common Sizes Available
- 3 mm to 6 mm — fine bars for precision components
- 8 mm to 50 mm — standard range for most industrial use
- 55 mm to 150 mm — heavy bars for flanges and pressure parts
- 155 mm to 300 mm+ — custom forgings available on request
Machining & Fabrication Tips for C276 Material
Machining: Use sharp positive-rake carbide tooling, lower cutting speeds, flood coolant, avoid interrupted cuts.
Welding: Use ERNiCrMo-4 filler wire; maintain interpass temperature below 93°C (200°F); clean base metal; post-weld annealing recommended for critical apps.
Storage: Store away from carbon steel; keep bar ends capped in humid environments; label pieces with heat number.
FAQ — Hastelloy C276 Round Bar
Conclusion
Hastelloy C276 Round Bar is not just another metal — it's a high-performance engineering solution built for environments where other alloys simply cannot survive. From chemical processing to offshore oil platforms, c276 material has proven itself as one of the most reliable and versatile nickel alloy bars available in the market today.
Whether you're an engineer specifying materials for a new plant, a procurement manager sourcing certified bar stock, or a fabricator looking for weldable high-alloy material — Hastelloy C276 Round Bar deserves to be on your shortlist.