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A high performace nickel alloy used for severe corrosion environments

Hastelloy B3 flanges deliver the same excellent resistance to hydrochloric acid and other strongly reducing chemicals as other B-alloys (including B2) but with significantly enhanced thermal stability and improved ease of fabrication. In addition, B3 flanges provide great resistance to knife-line and heat–affected zone attack. Like B2 alloy, B3 flanges are not recommended for use in the presence of ferric or cupric salts which can cause rapid corrosion failure. Click here to access details on the chemistry and specifications of Hastelloy B3 nickel alloy flanges.

Corrosion Resistance

Key Benefits

  • Excellent ductility during fluctuations to intermediate temperatures
  • Excellent resistance to pitting, corrosion and stress-corrosion cracking
  • Excellent resistance to knife-line and heat-affected zone attack

Resources: Hastelloy Torque SpecFlange DimensionsFlange Bolting Chart

Hastelloy Fastener Types: Bolts, Nuts, ScrewsStudsThreaded Rods, Washers

Flange Types Available: Blind FlangesLap Joint FlangesSlip On FlangesSocket Weld FlangesThreaded FlangesWeld Neck Flanges 

Hastelloy B3 Flange Chemistry & Specifications

B3 alloy, UNS N10675, is specifically designed to deal with very aggressive hydrochloric acid (HCl), hyrdrobromic acid (HBr) and sulfuric acids (H2SO4) as well as acetic, formic and phosphoric acids. Additionally Hastelloy B3 has improved structural integrity over B2. However B3 has little chromium, and it should NOT be used with oxidizing media in the presence of salts.

Hastelloy B3 Chemistry

Hastelloy B3 Specifications: N10675, ASTM B366, ASME SB366, WPHB3-W, ASME B16.9, ANNEALED, MERCURY FREE, EN 10204-3.1 (W/O X-RAY), ASTM B335, ASME SB335, ASTM B564, ASME SB564, DIMENSIONS PER ASME B16.5, ASTM B462, ASME SB462, ASME B16.5, COLD DRAWN, HOT FINISHED, ASTM B626, ASME SB626, B/SB626 CLASS III, ASTM B333, ASME SB333, COLD ROLLED, HOT ROLLED, Werkstoff 2.4600

Hastelloy B3 Sulfuric Acid Corrosion Performance

B3 Sulfuric


















Hastelloy B3 Hydrochloric Acid Corrosion Performance

 B3 Hydrochloric

Hastelloy B3 Phosphoric Acid Corrosion Performance

 B3 Phosphoric




















Hastelloy B3 Hydrobromic Acid Corrosion Performance

B3 Hydrobromic


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