Hastelloy B2 Chemical Composition, Properties, and Uses

Everything You Need To Know About Hastelloy B2

Hastelloy B2 / UNS N10665 / DIN 2.4617 is a nickel-molybdenum alloy containing high levels of chromium and molybdenum. Excellent corrosion resistance in a variety of organic and inorganic acids. It also exhibits good resistance to stress corrosion cracking and oxidation at elevated temperatures. Let's take a look at the composition, properties, and uses of this useful alloy.

Hastelloy B2 Chemical Composition

Hastelloy B2 (UNS N10665) is a nickel-molybdenum alloy known for its excellent resistance to reducing environments such as hydrochloric acid, sulfuric acid and phosphoric acid. The composition of Hastelloy B2 typically includes:

• Nickel (Ni): Bal.
• Molybdenum (Mo): 26.0 - 30.0%
• Iron (Fe): max. 2.0% Max
• Chromium (Cr): 1.0% Max
• Carbon (C): 0.02% Max
• Silicon (Si): 0.10% Max
• Manganese (Mn): 1.0% Max
• Cobalt (Co): 1.0% Max
• Sulfur (S): 0.03% Max
• Phosphorus (P): 0.04% Max

Alloy B2 UNS N10675 Features:

1. Corrosion resistance: Nickel Alloy 2.4617 has excellent corrosion resistance to a variety of corrosive environments, including reducing acids such as hydrochloric acid, sulfuric acid, and phosphoric acid. It is highly resistant to stress corrosion cracking, pitting and crevice corrosion.

2. High Temperature Stability: Good oxidation resistance at temperatures up to 1800°F and good formability at temperatures up to 1400°F – 1900°F.

3. Mechanical Properties: Hastelloy B2 material has excellent mechanical properties, including high tensile strength, yield strength and hardness. It maintains its strength and ductility even in harsh environments.

Physical Properties

4. Manufacturability: Hastelloy B2 UNS N10665 can be easily manufactured using common techniques such as welding, machining and forming. It can be welded using a variety of methods without the risk of sensitization or embrittlement.

5. Thermal Stability: The alloy exhibits good thermal stability, allowing it to withstand thermal cycling and temperature fluctuations without significant degradation.

2.4617 Alloy B2 Material Uses:

1. Chemical Processing: Nickel alloy B2 is widely used in the chemical processing industry to manufacture equipment such as reactors, vessels, pumps, valves and piping systems. Its corrosion resistance makes it suitable for handling corrosive chemical solutions.

2. Pharmaceutical: In the pharmaceutical industry, Hastelloy B2 is used to manufacture equipment used in pharmaceutical production and processing, including reaction vessels, distillation columns and storage tanks.

3. Pulp and Paper: Hastelloy alloy B2 is used in the pulp and paper industry to manufacture equipment exposed to corrosive chemicals during the pulping and bleaching processes. It is used in digesters, bleach towers and piping systems.

4. Waste Treatment: Since Hastelloy B2 is resistant to corrosive environments, it can be used in waste treatment facilities to handle acidic and corrosive waste streams. It is used in scrubbers, absorbers and chemical storage tanks.

5. Oil & Gas: Alloy B2 is used in the oil and gas industry to manufacture components exposed to corrosive environments, such as downhole equipment, pipes and valves. Its resistance to hydrogen sulfide (H2S) makes it suitable for sour gas applications.

What Forms is Hastelloy B2 Available at HT PIPE?

To summarize, Hastelloy B2 (UNS N10665) is a versatile nickel-molybdenum alloy known for its excellent corrosion resistance, high temperature stability, and mechanical properties. It is widely used in industries where resistance to corrosive environments is critical, including chemical processing, pharmaceuticals, pulp and paper, waste management, and oil and gas.