Hastelloy B-3 is covered by the following specifications: UNS N10675. Plate, Sheet, Strip: ASTM B333, ASME SB333, Bar: ASTM B 335, ASME SB335, (DUAL CERTIFIED TO ASTM B564, ASME SB564 ON 3-1/2 DIA. AND UP) Welded Pipe: ASTM B619, ASME SB619, CLASS I or II, (ABOVE 8 SCH 40) ASTM B775, ASME SB775, Seamless Pipe: ASTM B622, ASME SB622Hastelloy B3 Alloy - Speciality MetalsSep 26, 2017 · HASTELLOY B-3 alloy (UNS N10675) is an excellent resistance alloy to hydrochloric acid at all concentrations and temperatures. It also withstands sulfuric, acetic, formic and phosphoric acids, and other nonoxidizing media. B-3 alloy has a special chemistry designed to achieve a level of thermal stability greatly superior to that of its predecessors, e.g. HASTELLOY B-2 alloy.