Alloy B-2
| Bellows Materials | Alloy B-2 |
| Trade Name | Hastelloy B-2 |
| Description | Alloy B-2 is a solid solution strengthened, nickel-molybdenum alloy typically used in extreme reducing conditions. |
| Application Notes | Alloy B-2 has significantly lower carbon, silicon and iron compared to the predecessor, alloy B (UNS N10001). Compared to alloy B, alloy B-2 is less susceptible to weld zone corrosion in the as-welded condition. Controlling other alloying elements such as iron and chromium resolved potential issues with forming and shaping. Stringent chemistry control in the production of alloy B-2 allows the alloy to be used in the welded condition, and it is less susceptible to stress corrosion cracking under many conditions. Care must be taken in selecting the right alloy for the desired application. Alloy B-2 should not be used at temperatures between 1000°F and 1600°F as the alloy forms secondary phases that could decrease the ductility of the material. |
Alloy B-3 (UNS: N10675)
| Bellows Materials | Alloy B-3 |
| Trade Name | Hastelloy B-3 |
| Description | A Nickel-molybdenum alloy with excellent resistance to hydrochloric acid at all concentrations and temperatures. |
| Application Notes | It also withstands sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. B-3® alloy has a special chemistry designed to achieve a level of thermal stability. |
| UNS | N10675 |
| Specifications | ASTM B366, ASME SB-366 |