Hastelloy C276 (Uns N10276) Alloy Complete Guide
Hastelloy C276 is a renowned nickel-molybdenum-chromium superalloy with the addition of tungsten, providing unparalleled corrosion resistance in a wide range of harsh environments. Its high nickel and molybdenum contents provide excellent resistance to pitting and crevice corrosion under reducing conditions, while the chromium enhances its toughness in oxidizing environments. Its low carbon content prevents carbide precipitation during welding, ensuring sustained corrosion resistance in welded structures. Its resistance to grain boundary precipitation in the heat-affected zone (HAZ) makes it ideal for a variety of chemical processes in the welded state.
What is Hastelloy C276 used for?
C-276 alloy is widely used in the harshest environments, such as chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and sour gas recovery.
Corrosion Resistant Hastelloy C276 (Uns N10276)
Hastelloy C276 is renowned for its exceptional corrosion resistance, making it a versatile alloy suitable for harsh chemical environments. It effectively resists ferric and cupric chlorides, thermally contaminated media, chlorine compounds, acids such as formic and acetic acids, seawater, brines, and various chlorine-containing solutions. Its corrosion resistance extends to grain boundary precipitation in weld areas, ensuring reliability in a variety of chemical processes. It also offers excellent resistance to pitting and stress corrosion cracking.
Hastelloy C276 Chemical Composition (wt %)
| Element | Content (wt %) |
|---|---|
| Ni | Remainder |
| Mo | 15.0 - 17.0 |
| Cr | 14.5 - 16.5 |
| Fe | 4.0 - 7.0 |
| W | 3.0 - 4.5 |
| Co | 2.5 max |
| Mn | 1.0 max |
| C | 0.01 max |
| V | 0.35 max |
| P | 0.04 max |
| S | 0.03 max |
| Si | 0.08 max |
Hastelloy C276 Mechanical Properties
| Product Form | Tensile Strength (ksi) | 0.2% Yield Strength (ksi) | Elongation (%) |
|---|---|---|---|
| Bar | 110.0 | 52.6 | 62 |
| Plate | 107.4 | 50.3 | 67 |
| Sheet | 115.5 | 54.6 | 60 |
| Tube & Pipe | 105.4 | 45.4 | 70 |
Hastelloy C276 Physical Properties
(UNS N10276)
| Property | Metric Value | Imperial Value |
|---|---|---|
| Density | 8.89 g/cm³ | 0.321 lb/in³ |
| Melting Point | 1371°C | 2500°F |
Hastelloy C276 Thermal Properties
(UNS N10276)
| Property | Metric Value | Imperial Value |
|---|---|---|
| Thermal Expansion Coefficient (@24-93°C / 75.2-199°F) |
11.2 μm/m·°C | 6.22 μin/in·°F |
| Thermal Conductivity (@ -168°C) |
7.20 W/m·K | 50.0 BTU·in/(hr·ft²·°F) |
Hastelloy C276 (UNS N10276) features:
Excellent corrosion resistance in reducing environments.
Excellent resistance to strongly oxidizing salt solutions, such as ferric chloride and cupric chloride.
High nickel and molybdenum contents provide good corrosion resistance in reducing environments.
Low carbon content minimizes carbide precipitation at the weld boundary during welding, maintaining corrosion resistance in the heat-affected zone of the weld joint.
Resistant to localized corrosion, such as pitting and stress corrosion cracking.
Resistant to the corrosive effects of wet chlorine, hypochlorites, and chlorine dioxide, making it one of the few materials suitable for such applications.
Applications for Hastelloy C276 include:
Digesters and bleaching plants in the paper industry.
Components exposed to acid gases.
Flue gas desulfurization equipment.
Evaporators, heat exchangers, filters, and mixers used in sulfuric acid environments; sulfuric acid reactors.
Organic chloride process equipment.
Process equipment using halide or acid catalysts.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
