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Hastelloy® B-3 (Alloy B-3) UNS N10675

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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire
ASTM B333, ASTM B335

Hastelloy® B-3 Alloy Description

Alloy B-3 has excellent resistance to pitting corrosion and stress-corrosion cracking, plus thermal stability superior to that of alloy B-2. This alloy has also great resistance to knife-line and heat-affected zone attack. The improved thermal stability of alloy B-3 alloy minimizes the problems associated with fabrication of alloy B-2 alloy components. This is due to the reduced tendency to precipitate deleterious inter-metallic phases in B-3 alloy, thereby, affording it greater ductility than B-2 alloy during and following various thermal cycling conditions.Because this alloy contains no significant chromium addition it should NOT be used in oxidizing media or in presence of oxidizing salts, such as ferric or cupric salts. The latter may form when iron or copper is present in a system containing hydrochloric acid. Likewise alloy B-3 does not withstand wet chlorine gas or hypochlorite bleach.


Furnace and chemical process components
Components used in the production of herbicides, insecticides, ethylene glycol, ethyl benzene

Chemistry Typical

Nickel: 65.0 min
Chromium: 1.00-3.00
Molybdenum: 27.00-32.00
Iron: 1.0-3.0
Cobalt: 3.0 max
Tungsten: 3.0 max
Manganese: 3.0 max
Aluminum: 0.50 max
Titanium: 0.20 max
Silicon: 0.10 max
Carbon: 0.01 max
Copper: 0.20 max

Physical Properties

Density: 0.333 lbs/in³, 9.22 g/cm³

Electrical Resistivity: microhm-in, (microhm-cm):
70°F (21°C): 53.8 (137)

Specific Heat: BTU/lb/°F (J/kg•K):32-212°F (0-100°C): 0.089 (373)

Mean Coefficient of Thermal Expansion: in/in/°F (mm/m/°C):
70-212°F (20-100°C): 5.7 x 10-6 (10.6)

Thermal Conductivity: BTU-in/h-ft-°F (W/m-°K): 70°F (21°C): 78 (11.2)

Modulus of Elasticity: KSI (MPa)
31.4 x 10³ (216 x 10³) in tension

Melting Range: 2500-2585°F (1370-1418°C)

Mechanical Properties at Room Temperature

Annealed: Typical
Ultimate Tensile Strength: 125 KSI (860 MPa)
Yield Strength: (0.2% offset) 60 KSI (420 MPa)
Elongation: 50%

Properties Tempered
Alloy B-3 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact HT Pipe for details.

Additional Properties

Corrosion Resistance
Refer to NACE (National Association for Corrosion Engineers) for recommendations

Standard Wire Finishes
Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products.
Plated: Many plating options are available.
∗Special finishes are available: Contact HT Pipe Sales with special finish and plating requests.

Continuous Coils
Cut to lengths
Precision cutting

Heat Treatment
Alloy B3 cannot be hardened heat treating

For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”

Hastelloy® B-3 is a registered trademark of Haynes Alloys