Discover the latest trends and innovations in the nickel alloy industry. We provide expert insights and in-depth analysis on the newest developments in nickel alloys.
Hastelloy is the trademark name for a family of corrosion-resistant nickel-based alloys developed and produced by Haynes International. These alloys are specifically designed to perform in the most severe chemical and thermal environments. While “Hastelloy” is a brand name, the materials themselves are commonly known by their alloy numbers, Unified Numbering System (UNS) designations, or international standards. Engineers, fabricators, and suppliers frequently refer to these alloys using equivalent trade or generic names depending on the region or standard in use.
Each grade of Hastelloy has an equivalent name that identifies its composition and properties under different classification systems. The most widely used equivalents are the generic “Alloy” names and UNS numbers, which provide a universal identification for material specification and certification.
Below are some of the most common equivalents used for Hastelloy grades:
Hastelloy C-22 → Also known as Alloy C22 or UNS N06022. It offers exceptional resistance to oxidizing and reducing chemicals, making it ideal for mixed acid environments and pollution control equipment.
Hastelloy C-276 → Also referred to as Alloy C276 or UNS N10276. It is one of the most popular Hastelloy grades, with outstanding resistance to strong oxidizers, chlorine-bearing solutions, and hot contaminated acids.
Hastelloy B-2 → Also called Alloy B2 or UNS N10665. It is primarily resistant to hydrochloric acid and other strongly reducing environments.
Hastelloy B-3 → Also known as Alloy B3 or UNS N10675. It improves thermal stability and fabrication performance over B-2, maintaining excellent corrosion resistance to reducing acids.
Hastelloy C-4 → Equivalent to Alloy C4 or UNS N06455. It resists strong oxidizers and provides better ductility after long-term exposure to high temperatures.
Hastelloy G-30 → Also referred to as Alloy G30 or UNS N06030. Designed for superior resistance to phosphoric and nitric acids.
Hastelloy X → Also known as Alloy X or UNS N06002. It combines oxidation resistance with high-temperature strength, making it popular for gas turbine and furnace components.
Hastelloy is a registered trademark of Haynes International, Inc. in the United States. Haynes was one of the pioneers in developing high-performance nickel and cobalt alloys for demanding industrial environments. Over time, the term “Hastelloy” has become almost synonymous with corrosion-resistant nickel-molybdenum-chromium alloys, although other manufacturers produce similar materials under different trade names such as Alloy C22, Alloy C276, or simply Nickel-Chromium-Molybdenum Alloy.
Although Hastelloy is a specific brand, many equivalent materials exist with nearly identical compositions and performance characteristics. For example:
• Inconel (by Special Metals) – another nickel-chromium-based alloy family focused on high-temperature strength.
• Incoloy – nickel-iron-chromium alloys designed for heat resistance and oxidation control.
• Nicrofer (by VDM Metals) – European equivalent brand for nickel-chromium-molybdenum alloys similar to Hastelloy.
• Alloy C22 / C276 / B2 – generic designations often used by other global producers without trademark usage.
Hastelloy alloys are listed under several international standards and specifications, making them globally recognized and interchangeable. Some examples include:
• ASTM: B574 (bars), B575 (plates), B622 (pipes), B619 (welded tubes)
• UNS: N06022, N10276, N10665, N10675, N06002
• EN/DIN: 2.4602 (C-22), 2.4819 (C-276), 2.4617 (B-2)
• ISO: Nickel-Chromium-Molybdenum alloys with defined chemical compositions for corrosion service
Hastelloy is widely used in industries that demand resistance to both oxidizing and reducing environments. Common applications include:
• Chemical processing equipment such as heat exchangers, evaporators, and reaction vessels
• Pollution control systems and scrubbers
• Pulp and paper bleaching systems
• Marine and offshore engineering equipment
• Pharmaceutical and food processing machinery exposed to aggressive chemicals
• Aerospace combustion and turbine components (Hastelloy X in particular)
In everyday engineering and trade use, the name “Hastelloy” is often replaced by the alloy number or UNS code. For example, a purchase order may specify “Nickel Alloy C276” instead of “Hastelloy C-276.” This practice ensures clarity when sourcing materials from different suppliers while maintaining compliance with global standards.
In practice, the term “Hastelloy” represents a family of alloys rather than a single material. Each grade corresponds to a distinct chemical composition, identified by its UNS number and sometimes an equivalent international standard. Therefore, the “other name” for Hastelloy is typically its Alloy number (e.g., Alloy C22, Alloy C276) or its UNS designation (e.g., N06022, N10276). These identifiers are universally accepted and used interchangeably across industries worldwide.
