UNS N10276 is a nickel-chrome-molybdenum alloy with tungsten. It is characterized by: Extraordinary resistance across a wide range of corrosive, watery media; in particular oxidizing and reducing acids ∙ Particularly high resistance against chloride-induced crevice, pitting and stress corrosion.
| Zeon Grade | Alloy Name | UNS | EN / DIN / W Nr. | Trademarks |
|---|---|---|---|---|
| ZeonC276 | Alloy C276 | UNS N10276 | 2.4819 | Hastelloy C276 |
| Element | Content (%) |
|---|---|
| Nickel, Ni | 57 |
| Molybdenum, Mo | 15-17 |
| Chromium, Cr | 14.5-16.5 |
| Iron, Fe | 4-7 |
| Tungsten, W | 3-4.50 |
| Cobalt, Co | 2.50 |
| Manganese, Mn | 1 |
| Vanadium, V | 0.35 |
| Silicon, Si | 0.080 |
| Phosphorous, P | 0.025 |
| Carbon, C | 0.010 |
| Sulfur, S | 0.010 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.89 g/cm³ | 0.321 lb/in³ |
| Melting point | 1371°C | 2500°F |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength (@thickness 4.80-25.4 mm, 538°C/@thickness 0.189-1.00 in, 1000°F) | 601.2 MPa | 87200 psi |
| Yield strength (0.2% offset, @thickness 2.40 mm, 427°C/@thickness 0.0945 in, 801°F) | 204.8 MPa | 29700 psi |
| Elastic modulus (RT) | 205 GPa | 29700 ksi |
| Elongation at break (in 50.8 mm, @thickness 1.60-4.70 mm, 204°C/@thickness 0.0630-0.185 in, 399°F) | 56% | 56% |
| Hardness, Rockwell B (plate) | 87 | 87 |
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@24-93°C/75.2-199°F) | 11.2 µm/m°C | 6.22 µin/in°F |
| Thermal conductivity (-168 °C) | 7.20 W/mK | 50.0 BTU in/hr.ft².°F |
| Corrosion Resistance Properties of Alloy C276 |
|---|
| UNS N10276 can be used in many chemical processes with both oxidizing as well as reducing media. The high chrome and molybdenum concentrations make the alloy resistant to chloride ion attacks. The tungsten content further increases this resistance. UNS N10276 is one of the few materials that are resistant against chlorine gas, hypochlorite and chlorine dioxide solutions. The alloy is characterized by excellent resistance against concentrated solutions of oxidizing salts (such as iron III and copper chloride). |
| Machinability | UNS N10276 should be machined in the heat-treated condition. For reasons of the considerably increased tendency to work hardening in comparison to austenitic stainless steels, a low-cut speed at a feed level that is not too high should be selected and the cutting tool should be engaged at all times. An adequate depth of cut is important in order to cut below the previously formed strain-hardened zone. Optimum heat dissipation through the use of large quantities of suitable, preferably aqueous, lubricants has considerable influence on a stable machining process. |
|---|---|
| Hot Forming | UNS N10276 should be hot-formed in a temperature range of 950 to 1,200 °C (1,742 to 2,192 °F) with subsequent rapid cooling in water or in air. Heat treatment after hot-working is recommended in order to achieve optimal corrosion behavior. For heating up, workpieces should be placed in a furnace that is already heated up to the target value. |
| Cold Forming | The workpieces should be in the annealed condition for cold working. UNS N10276 has significantly higher cold forming properties than the widely used austenitic stainless steels. This must be taken into account during design and selection of forming tools and equipment and during the planning of forming processes. Intermediate annealing is necessary for major cold-working treatment. When cold forming of > 15 %, final solution annealing must be conducted. |
| Welding: | UNS N10276 is capable of being welded by the commonly used welding methods. During the welding process excessive input of heat should be avoided. For corrosive applications this alloy is capable of being used in the “as-welded” condition without the need for more heat treatment. |
| Heat Treatment | UNS N10276 is solution heat treated at 1121°C (2050°F) and then quenched rapidly. In case of forging or hot forming, the parts should first be solution heat treated before usage. |
| Applications | Paper and pulp industry, e.g. for digestion and bleaching tanks ∙ Washers, agitators and wet ventilators in flue gas desulfurization systems ∙ Equipment and components for acid gas applications ∙ Reactors for acetic acid production ∙ Sulfuric acid coolers ∙ Methylene diphenyl isocyanate (MDI) ∙ Manufacturing and processing of contaminated phosphoric acid. |