Hastelloy B-3合金是一种镍钼合金优良的耐蚀合金。能承受所有盐酸浓度同时也能承受硫酸，醋酸，甲酸，磷酸及其他非氧化性腐蚀介质。 B - 3合金有一个特殊的化学成分设计较之前的B-2合金稳定性及延展性有了大大的提高。  
Hastelloy B-3合金的化学成分：
Ni............................................65
Mo...........................................28.5
Cr............................................1.5
Fe............................................1.5
Co............................................3
W.............................................3
Mn............................................3
Al..............................................0.5
Ti..............................................0.2
Si.............................................0.1
C.............................................0.01