A nickel-molybdenum grade, Alloy B-2 is extremely resistant to hydrochloric acid in a wide range of temperatures.
Alloy B-2 is a solid-solution strengthened nickel alloy which is normally used in extreme reducing conditions. Alloy B-2 also exhibits good resistance to hydrogen chloride, sulphuric acid and phosphoric acid.
| % | Ni | Mo | Cr | Si | C | Mn | P | S | Fe |
|---|---|---|---|---|---|---|---|---|---|
| Min | Balance | 26 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Max | Balance | 30 | 1 | 0.1 | 0.3 | 0.5 | 0.04 | 0.03 | 2 |
Alloy B-2 is a nickel-molybdenum alloy with significant resistance to reducing environments, such as hydrogen chloride gas and sulphuric, acetic and phosphoric acids. Hastelloy® B-2 provides resistance to pure sulphuric acid and a number of non-oxidising acids. The alloy should not be used in oxidising media or where oxidising contaminants are available in reducing media. Premature failure may occur if alloy B-2 is used where ferric iron, cupric ion and free chlorides are present.
With a high nickel content, Hastelloy® B-2 is immune to chloride-induced stress corrosion cracking.
Hastelloy® is the registered trademark of Haynes International.
| Mechanical & Physical Properties | 21.1°C | 93.3°C | 204.4°C | 315.6°C | 426.7°C | 537.8°C | 648.9°C |
|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength /MPa | 894 | - | 849 | 823 | 806 | - | - |
| 0.2% Yield Strength /MPa | 412 | - | 350 | 328 | 310 | - | - |
| Elongation % | 61 | - | 59 | 60 | 60 | - | - |
| Coefficient of Thermal Expansion /µm/m°C | - | 10.3 | 10.8 | 11.2 | 11.5 | 11.7 | - |
| Thermal Conductivity /kcal/(hr.m.°C) ** | 9.55 | 10.49 | 11.52 | 12.56 | 13.76 | 14.88 | 16.08 |
| Modulus of Elasticity / GPa | 217 | - | - | 202 | 196 | 189 | - |
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