Hastelloy B-3 (UNS N10675 / W.Nr. 2.4600)

Hastelloy B-3 (UNS N10675 / W.Nr. 2.4600) 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

Chemical Composition, %

Hastelloy B-3≤0.01≤0.10≤3.00≤0.03≤0.011.0-3.0≥65.0≤3.0027.0-32.0≤3.00≤0.50≤0.20≤0.20≤0.201.0-3.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B335, ASME SB335, ASTM B366, ASME SB366, ASTM B564, ASME SB564, ASTM B472, ASME SB472
Plate, Sheet and StripASTM B333, ASME SB333
Pipe and TubeASTM B622, ASME SB622, ASTM B619, ASME SB619
Welding ProductAWS A5.11 (ENiMo-10), AWS A5.14 (ERNiMo-10)
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