Alloy B-3®

Alloy B-3® Nickel Pipe

UNS N10675 / W.Nr. 2.4600


Alloy B-3® is a nickel-molybdenum solid solution strengthened super-alloy with a nominal chemical composition of 65% nickel and 28% molybdenum with additions of iron, manganese, tungsten, and cobalt. It is commonly referred to by the tradename Hastelloy® B-3 and the universal designation UNS N10675. B-3® is known for its resistance to reducing acids, particularly hydrochloric and sulfuric, and also has good thermal stability.


Corrosion graphic

Corrosion Resistance

Alloy B-3® is resistant to non-oxidizing acids, including hydrochloric, sulfuric, and phosphoric acids. However, B-3® has a low chromium content and should not be used in oxidizing acids or salts. The molybdenum content in B-3® confers resistance to chloride-induced localized corrosion, including chloride stress corrosion cracking and chloride-induced pitting and crevice corrosion.
Service Temperature

Elevated Temperature Resistance

B-3® does not possess good oxidation resistance and is limited to a maximum service temperature of 800°F (427°C).
Mechanical Properties

Mechanical Properties

B-3® is typically provided in the low-strength annealed condition. It maintains excellent toughness at cryogenic temperatures.
heat treatment logo

Heat Treatment

B-3® cannot be strengthened by heat treating. It is typically annealed at 1950°F (1065°C) followed by rapid cooling. B-3® should not be exposed to temperatures in the range of 1100°F - 1500°F (593°C - 815°C) for extended periods, as deleterious phases can form in the microstructure leading to cracking. B-3® is a solid solution alloy and does not respond to age hardening.


B-3® can be cold worked or hot worked through standard methods using common techniques. B-3® is prone to rapid work-hardening, and intermediate annealing treatments may be needed to recover ductility. Solution annealing should be conducted after cold working for optimum corrosion resistance.


B-3® is used in the chemical process industry to handle concentrated acids and other aggressive media. Other uses include heat-treating fixtures, aerospace, food processing, oil & gas, aerospace, and nuclear power generation. CRA offers specialty alloy B-3® seamless pipe & tube for use in multiple industries and applications, including:

  • Chemical Processing
  • Aerospace
  • Food Processing
  • Oil & Gas
  • Nuclear Power Generation
  • Heat-treating Fixtures

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Chemical Composition

≤ 0.011 - 3≥ 651 - 3≤ 3≤ 0.127 - 32≤ 3≤ 0.2≤ 3≤ 0.5
(mass %)



Specified Mechanical Properties

Per ASTM B622
Tensile StrengthYield StrengthElongation
minimum, ksiminimum, ksiminimum, %

Typical Physical

Thermal ExpansionX10-6/°F5.
Elastic Modulus103 ksi31.430.930.129.328.325.7
Poisson Ratio-0.3-----
Thermal ConductivityBtu-in/h·ft2·°F788393104116139
Specific HeatBtu/lb·°F0.0890.0920.0980.1020.1040.118
Yield Strengthksi585448444134
Tensile Strengthksi12812211511110888

Manufacturing Process

Steel MakingElectric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe MakingConventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat TreatmentCannot be hardened by heat treatment. Typically provided in the annealed condition.

Manufacturing Capabilities

CRA offers this alloy in:
Seamless Pipe

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
THICKNESS: Up to 1.925”
LENGTHS: Up to 70′

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated