Hastelloy is a term used to describe nickel metals that are alloyed to increase corrosion resistance. This is mainly achieved by adding molybdenum and chromium. Hastelloy comes in many grades, each with a different chemical composition to optimize a specific set of properties.

Because Hastelloy usually contains large amounts of molybdenum and chromium, it performs better in severely corroded environments than other specialty metal products such as chromium alloy. The addition of molybdenum also improves the overall workability. Hastelloy is also malleable and easy to make and form.

Hastelloy grades generally have the following characteristics:

• Excellent corrosion resistance

• Good weldability

• Antioxidants and acids

How is Hastelloy made?

Since Hastelloy is a metal alloy, it is made by combining the original elements together in a hot liquid state. There are different grades, each containing a specific chemical composition. The mixture may contain 1 to 25 percent chromium, 5 to 30 percent molybdenum, and 0 to 30 percent iron, with the rest consisting of nickel. Additional additives can include carbon, tungsten, vanadium and titanium, depending on the grade.

Once the metals have been combined, smelted, and mixed together, they can be cast for further manufacturing.

What is Hastelloy used for?

Given that Hastelloy is designed to have excellent corrosion resistance, it is a good choice for any medium to severe corrosive environment where product life is important.  It is commonly used in pipes and valves in the chemical and petrochemical industries.  It is also used in reactor vessels in the chemical and nuclear industries.

Hastelloy has many grades, but C276 is one of the most commonly used grades. This grade is commonly used in these harsh environments as well as in paper and pulp production and waste disposal.