What is the Difference Between Hastelloy and Stainless Steel?

Hastelloy and stainless steel are both used in various industries due to their corrosion resistance and durability. However, there are key differences between the two materials:

1. Composition: Hastelloy is a nickel-based alloy that contains chromium and molybdenum, while stainless steel is an alloy of steel with a high chromium content.
2. Corrosion Resistance: Hastelloy generally offers better corrosion resistance, especially in harsh chemical and high-temperature applications. Stainless steel also provides corrosion resistance but not to the same extent as Hastelloy.
3. High-Temperature Resistance: Hastelloy demonstrates high resistance to oxidation at higher temperatures, making it more suitable for applications where stainless steel may be susceptible to high-temperature oxidation and surface discoloration.
4. Strength: Hastelloy is often considered to have greater strength, toughness, and overall better performance compared to stainless steel.
5. Price: Hastelloy is generally more expensive than stainless steel, so it is typically reserved for applications that require its specific properties.

When choosing between Hastelloy and stainless steel, it is essential to consider the specific needs of the application. If high corrosion resistance, high-temperature resistance, and strength are required, Hastelloy may be the better choice. On the other hand, if a balance between corrosion resistance, strength, and cost-effectiveness is desired, stainless steel may be more suitable.

Comparative Table: Hastelloy vs Stainless Steel

Here is a table comparing the differences between Hastelloy and stainless steel:

Hastelloy is a nickel-based alloy known for its excellent corrosion resistance, high-temperature resistance, and strength. In contrast, stainless steel is an iron-based alloy with chromium and nickel, offering good corrosion resistance and ductility. The choice between Hastelloy and stainless steel depends on the specific application, as Hastelloy is generally more expensive than stainless steel.