Hastelloy B3 alloy is molybdenum and nickel stabilized alloy addition to the good resistant ability to stress corrosion cracking, pitting and corrosion resisting. Additionally, thermal stability superior is good when compared to other alloys. This nickel steel alloy is having good resistance to knife line as well as the heat affected area. This alloy withstands phosphoric, sulfuric, formic and acetic acid and non-oxidizing media. Additionally, this alloy is having high resistance to hydrochloric acid at various concentrations and temperatures. It too maintains ductility when transient exposure to maintain excellent ductility and is experienced at the time of heat treatment connected with fabrications.