Hastelloy B3 fasteners and flanges deliver the same excellent resistance to hydrochloric acid and other strongly reducing chemicals as other B-alloys (including B2) but with significantly enhanced thermal stability and improved ease of fabrication. In addition, B3 fasteners and flanges provide great resistance to knife-line and heat–affected zone attack. Like B2 alloy, B3 fasteners are not recommended for use in the presence of ferric or cupric salts which can cause rapid corrosion failure. See below for the specifications and chemistry of B3 nickel alloy fasteners.
Availability: Hastelloy B3 fasteners are generally available in 1/2" sizes and larger due to materials availability. Most B3 fasteners are made to order.
- Excellent ductility during fluctuations to intermediate temperatures
- Excellent resistance to pitting, corrosion and stress-corrosion cracking
- Excellent resistance to knife-line and heat-affected zone attack
B3 nickel alloy, UNS N10675, is specifically designed to deal with very aggressive hydrochloric acid (HCl), hyrdrobromic acid (HBr) and sulfuric acids (H2SO4) as well as acetic, formic and phosphoric acids. Additionally Hastelloy B3 has improved structural integrity over B2. However B3 has little chromium, and it should NOT be used with oxidizing media in the presence of salts.
Hastelloy B3 Specifications: N10675, ASTM B366, ASME SB366, WPHB3-W, ASME B16.9, ANNEALED, MERCURY FREE, EN 10204-3.1 (W/O X-RAY), ASTM B335, ASME SB335, ASTM B564, ASME SB564, DIMENSIONS PER ASME B16.5, ASTM B462, ASME SB462, ASME B16.5, COLD DRAWN, HOT FINISHED, ASTM B626, ASME SB626, B/SB626 CLASS III, ASTM B333, ASME SB333, COLD ROLLED, HOT ROLLED, Werkstoff 2.4600