Alloy B-3 / UNS N10675

Hastelloy B3


Hastelloy B3 (UNS N10675) is a strong and high-performing nickel-molybdenum alloy, is well-known for its outstanding resistance to corrosion and impressive performance in various industries, particularly in environments that promote reduction. This high-performing material is frequently used in the chemical, petrochemical, and power generation industries, where sturdiness and dependability are essential.

Alloy B3 Inventory

Product Form Size range from Size range to

Hastelloy B3 pipe

0.5 in 8 in

Hastelloy B3 tube

12 mm 260 mm

Hastelloy B3 pipe fittings

0.5 in 8 in

Hastelloy B3 flanges

0.5 in 8 in

Industries and Applications

Chemical Processing: Hastelloy B3 is widely used in equipment that comes into contact with aggressive chemicals, such as heat exchangers, reactors, and columns. Its corrosion resistance ensures the durability and reliability of these critical components.

Petrochemical Industry: In the petrochemical industry, Hastelloy B3 is frequently utilized for components exposed to highly corrosive substances, including sour gas and oil. Its resilience in these harsh conditions makes it a top choice for materials in this sector.

Power Generation: Hastelloy B3 is employed in power generation plants, where it’s used in components like waste incinerators, combustion chambers, and superheater tubing due to its excellent corrosion resistance and thermal stability.

Pollution Control: In the pollution control industry, Hastelloy B3 is used in components such as scrubbers and gas cleaning systems, ensuring reliable performance and resistance to corrosive environments.

Key Properties of Hastelloy B3

Superior Corrosion Resistance: Hastelloy B3 is highly resistant to various corrosive environments, including hydrochloric and sulfuric acids. Its unique combination of nickel and molybdenum provides outstanding resistance to both localized and general corrosion, making it a preferred choice for harsh environments.

Excellent Thermal Stability: This alloy exhibits remarkable thermal stability, withstanding temperatures up to 1500°F (816°C). Its ability to maintain its mechanical properties at high temperatures makes it ideal for applications where elevated temperatures are a factor, such as heat exchangers and reactors.

Enhanced Fabricability: Hastelloy B3 displays improved fabricability compared to its predecessor, Hastelloy B2. It can be readily formed, welded, and machined using conventional techniques, making it a versatile material for various applications.

Resistance to Hydrogen Embrittlement Unlike many other nickel alloys, Hastelloy B3 is highly resistant to hydrogen embrittlement, ensuring the material’s longevity and reliability in hydrogen-rich environments.

Fabrication and Heat Treatment 

Hastelloy B3 is a versatile and highly resistant nickel-molybdenum alloy that is known for its excellent performance in a wide range of corrosive environments. This high-performance alloy is also highly sought after for its superior fabrication and heat treatment properties, making it a popular choice for a wide range of industrial applications.

Fabrication of Hastelloy B3 is relatively straightforward and can be achieved using standard fabrication techniques for nickel-based alloys. This alloy is both formable and weldable, making it a versatile option for a wide range of applications. Cold working is possible with Hastelloy B3, although intermediate annealing may be necessary to avoid work hardening. Forging should be performed at a temperature between 1750°F and 2050°F, followed by rapid cooling.

Heat treatment of Hastelloy B3 is also relatively straightforward, with annealing performed at a temperature range between 2020°F and 2150°F, followed by a rapid quench. Cooling at an accelerated rate is important to avoid the formation of detrimental phases that may form between 400°F and 1800°F. Welding can be performed using gas tungsten-arc, gas metal-arc, and shielded metal-arc processes.

Applicable Specifications of Hastelloy B3

Form ASTM ASME Other

Alloy B3 Sheet & Plate

B333 SB 333 N10665

Alloy B3 Bar

B335 SB 335 N10665

Alloy B3 Pipe & Tube

B622, B619 SB 622, SB 619 N10665

Alloy B3 Weld Wire

B333 SB 333 N10665

Alloy B3 Fitting

B366 SB 366 N10665

Alloy B3 Forging

B564 SB 564 N10665

Alloy B3 Castings

B564 SB 564 N10665

Common Trade Names

HASTELLOY B-3® is a trademark owned by of Haynes International Inc.


Key Properties

(in annealed condition)

Tensile strength: 690 MPa
Yield strength: 345 MPa
Elongation: 40%
300 HB


Chemical Composition (%)

Element Composition
Nickel Balance
Molybdenum 2.5 – 3.5%
Chromium 2.0% Max
Iron 1.0% Max
Manganese 1.0% Max
Cobalt 1.0% Max
Carbon 0.02% Max
Silicon 0.08% Max
Tungsten 0.5% Max
Copper 0.5% Max
Sulfur 0.03% Max

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