Who are the top producers of hastelloy material in the world?

The top producers of Hastelloy, a family of corrosion-resistant alloys primarily made of nickel, include Haynes International, Inc., Special Metals Corporation, and Techmetals, Inc. These companies are known for their expertise in manufacturing high-performance nickel alloys for various industries, including aerospace, chemical processing, and oil and gas. Other notable manufacturers may include Allegheny Technologies Incorporated (ATI) and Carpenter Technology Corporation.