Project Description

Hastelloy B-3 (UNS N10675)

Hastelloy B-3 (UNS N10675) is a nickel-molybdenum alloy with excellent resistance to pitting, corrosion, and stress-corrosion cracking plus, thermal stability superior to that of alloy B-2. In addition, this nickel steel alloy has great resistance to knife-line and heat–affected zone attack. Alloy B-3 also withstands sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. Furthermore, this nickel alloy has excellent resistance to hydrochloric acid at all concentrations and temperatures. Hastelloy B-3’s distinguishing feature is its ability to maintain excellent ductility during transient exposures to intermediate temperatures. Such exposures are routinely experienced during heat treatments associated with fabrication.

Equivalent Grades

Hastelloy B-3NS3203Hastelloy B-3N10675NiMo29Cr2.4600

Product Forms

Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings

Chemical Composition,%


Typical Physical & Mechanical Properties (Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaElongation,%


Rod, Bar, Wire, ForgingsASTM B335, ASME SB335
Plate, Sheet, StripASTM B333, ASME SB333
Pipe, TubeASTM B622, ASME SB622, ASTM B619/ASME SB619
OthersASTM B366/ASME SB366, ASTM B564/ASME SB564


  • Maintains excellent ductility during transient exposures to intermediate temperatures
  • Excellent resistance to pitting, corrosion and stress-corrosion cracking
  • Excellent resistance to knife-line and heat-affected zone attack
  • Excellent resistance to acetic, formic and phosphoric acids and other non-oxidizing media
  • Resistance to hydrochloric acid at all concentrations and temperatures
  • Thermal stability superior to alloy B-2


  • Acetic acid production, initial phase in presence of iodide catalyst
  • Methyl methacrylate production with hot 98 % H2SO4
  • Production of herbicides, insecticides, ethylene glycol, ethyl benzene