ThePipingMart Blog Metals Hastelloy B – Composition, Properties and Uses

Hastelloy B – Composition, Properties and Uses

Hastelloy B

Hastelloy B is an alloy of nickel, molybdenum, and chromium. It has superior corrosion resistance in both oxidizing and reducing atmospheres. This makes it ideal for various applications in chemical processing, petrochemical, automotive, aerospace, and marine engineering industries. This blog post will discuss the composition, physical properties, chemical properties, mechanical properties, welding capabilities, uses, corrosion resistance, and heat treatment of Hastelloy B.

Composition of Hastelloy B:

The main components of Hastelloy B are Nickel (Ni), Molybdenum (Mo), and Chromium (Cr). Other elements, such as iron (Fe), are also present in small amounts. These three elements comprise about 88% to 90% of the alloy’s total mass.

Physical Properties: The most noticeable physical property of Hastelloy B is its high strength. Its tensile strength is around 1625 MPa at room temperature. It also has a very low thermal expansion coefficient, allowing it to maintain its shape even when exposed to extreme temperatures. Another important property is its hardness which ranges from HB 160-190 depending on the type of heat treatment used on the material.

Chemical Properties:

Due to its high nickel content, Hastelloy B offers superior resistance to a wide range of chemicals, including hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), and phosphoric acid (H3PO4). In addition, it can also resist organic acids like formic acid or acetic acid quite well. It also has excellent weldability, with no hot cracking observed during welding under normal conditions.

Mechanical Properties:

Compared with other metals in its class, such as stainless steel or titanium alloys, Hastelloy B has superior mechanical properties; more specifically, it has higher yield strength and ductility than most other alloys class. This makes it ideal for applications where high strength and flexibility are required, such as aircraft engine components or pressure vessels.

Welding Capabilities:

One advantage of hastelloy B over other metals is that it can be welded without preheating or post-heating treatments due to its low melting point (1350°C). This makes welding much more accessible than other materials and allows for faster production due to the reduced time spent on welding operations alone. Additionally, it can be welded using many different types of electrodes, so there is no need to purchase specialized tools just for this material type.


Due to its excellent corrosion resistance, Hastelloy B can be used in various applications, including chemical processing equipment like valves or pumps; petrochemical processes; automotive exhaust systems; aerospace components; marine engineering components; medical instruments; nuclear power plant components, etc. It is also often used for decorative purposes due to its bright finish when polished correctly, making it an ideal choice for jewelry makers as well as sculptors looking for a durable metal that won’t corrode over time like some other materials would do if exposed to water or air contaminants long enough.

Corrosion Resistance

Hastelloy B has unique corrosion-resistant properties due to its iron, chromium, and molybdenum content. It can withstand high temperatures of up to 850-1000°F within various applications. Additionally, the material boasts good oxidation resistance in cyclic and long-term exposures. The alloy is popular for process piping due to its excellent resistance against sulfuric acid, hydrochloric acid, formic acid, and acetic acid. The exceptional corrosion resistance of Hastelloy B can help extend the life of piping systems used in harsh conditions.

Heat treatment

Hastelloy B is complicated to heat treat due to its high alloy content and nickel-based composition. In light of this, it’s critical for those who use the material to know exactly what treatments are best to ensure proper crystal structure formation during processing. Generally speaking, Hastelloy B benefits from a solution annealing treatment which consists of heating the material within a Nitrogen atmosphere up to 1800°F followed by rapidly quenching it. This helps restore the metal’s strength, ductility, and toughness without sacrificing its more desirable properties. Hastelloy B heat treatment can be one of the most powerful techniques for improving mental performance and durability with the right amount of care and precision in the application.


Hastelloy B is an extremely strong and versatile metal, ideal for engineering applications due to its high-temperature resistance, durability, and non-corrosive nature. However, machining Hastelloy B can only be more accessible if the correct tools and techniques are used. High-speed steel cutting tools are often recommended for the most efficient finish possible and a coolant to prevent burning. It’s essential to go slow when machining Hastelloy B to avoid work hardening from too high of pressure but move quickly enough that you can anticipate challenging shapes before they become too difficult. However, with proper planning and attention, machining this resilient material can be advantageous for those looking for a long-lasting final product.


Hastelloy b is an incredibly useful metal alloy thanks to its corrosion resistance capabilities combined with good mechanical properties such as yield strength and ductility makes it an ideal choice for many different industries, from petrochemical plants to aerospace manufacturing companies looking for solid yet reliable materials that won’t rust easily over time when exposed to harsh chemicals or extreme temperatures levels often encountered during certain operations requiring heat treatment processes such as hardening or tempering, etc. Its ease when welding makes it even more attractive since there’s no need for preheating/post-heating treatments that could take away precious production time from any fabrication process where fast turnaround times are essential. Its versatile nature means that hastelloy b be used in industry and decorative items such as jewelry-making pieces since polishing will give them a bright finish once completed! All these factors combine, making hastelol b one of the most popular choices today!

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