Howmet Aerospace Inc. provides advanced engineered solutions for the aerospace and transportation industries in the United States, Japan, France, Germany, the United Kingdom, Mexico, Italy, Canada, Poland, China, and internationally. It operates through four segments: Engine Products, Fastening Systems, Engineered Structures, and Forged Wheels. The Engine Products segment offers airfoils and seamless rolled rings primarily for aircraft engines and industrial gas turbines; and rotating and structural parts. The Fastening Systems segment produces aerospace fastening systems, as well as commercial transportation, industrial, and other fasteners; and latches, bearings, fluid fittings, and installation tools. The Engineered Structures segment provides titanium ingots and mill products, aluminum and nickel forgings, and machined components and assemblies for aerospace and defense applications; and titanium forgings, extrusions, and forming and machining services for airframe, wing, aero-engine, and landing gear components. The Forged Wheels segment offers forged aluminum wheels and related products for heavy-duty trucks and commercial transportation markets. The company was formerly known as Arconic Inc. Howmet Aerospace Inc. was founded in 1888 and is based in Pittsburgh, Pennsylvania.

Carpenter Technology Corporation engages in the manufacture, fabrication, and distribution of specialty metals in the United States, Europe, the Asia Pacific, Mexico, Canada, and internationally. It operates in two segments, Specialty Alloys Operations and Performance Engineered Products. The company offers specialty alloys, including titanium alloys, powder metals, stainless steels, alloy steels, and tool steels, as well as additives, and metal powders and parts. It serves to aerospace, defense, medical, transportation, energy, industrial, and consumer markets. The company was founded in 1889 and is headquartered in Philadelphia, Pennsylvania.

ATI Inc. produces and sells specialty materials and complex components worldwide. It operates in two segments: High Performance Materials & Components (HPMC) and Advanced Alloys & Solutions (AA&S). The HPMC segment produces various materials, including titanium and titanium-based alloys, nickel- and cobalt-based alloys and superalloys, metallic powder alloys, advanced powder alloys and other specialty materials, in long product forms, such as ingot, billet, bar, rod, wire, shapes and rectangles, and seamless tubes, as well as precision forgings, components, and machined parts. The AA&S segment produces zirconium and related alloys, including hafnium and niobium, nickel-based alloys, titanium and titanium-based alloys, and specialty alloys in a variety of forms, such as plate, sheet, and precision rolled strip products. It also provides hot-rolling conversion services, including carbon steel products. ATI Inc. serves to aerospace and defense, energy, automotive, construction and mining, food equipment and appliances, and medical markets. The company was formerly known as Allegheny Technologies Incorporated. ATI Inc. was incorporated in 1996 and is headquartered in Dallas, Texas.

Lincoln Electric Holdings, Inc., through its subsidiaries, designs, develops, manufactures, and sells welding, cutting, and brazing products worldwide. The company operates through three segments: Americas Welding, International Welding, and The Harris Products Group. It offers brazing and soldering filler metals, arc welding equipment, plasma and oxyfuel cutting systems, wire feeding systems, fume control equipment, welding accessories, and specialty gas regulators, and education solutions, as well as a portfolio of automated solutions for joining, cutting, material handling, module assembly, and end of line testing, as well as involved in brazing and soldering alloys, and in the retail business in the United States. In addition, the company manufactures copper and aluminum headers, distributor assemblies, and manifolds for the heating, ventilation, and air conditioning sector in the United States and Mexico; provides specialty welding consumables, wear plates and maintenance and repair services for alloy and wear-resistant products used in mining, steel, agricultural, and industrial mill applications; and designs and manufactures robotic assembly and arc welding systems that automate the tacking and welding of steel beams. Further, the company serves general fabrication, oil and gas, power generation, process, automotive and transportation, and construction and infrastructure industries, as well as heavy fabrication, ship building, and maintenance and repair markets. It sells its products directly to users of welding products, as well as through industrial distributors, retailers, and agents. The company was founded in 1895 and is headquartered in Cleveland, Ohio.

Minerals Technologies Inc. develops, produces, and markets various mineral, mineral-based, and related systems and services. The company operates through two segments, Consumer & Specialties, and Engineered Solutions segments. The Consumer & Specialties segment offers household and personal care products, such as pet litter, personal care, fabric care, edible oil and other fluid purification, animal health, and agricultural products; and specialty additives products, including precipitated calcium carbonate and ground calcium carbonate products that are used in the paper, paperboard, and fiber based packaging industries, as well as automotive, construction, and table and food applications. This segment produces limestone and dolomitic limestone used in construction, automotive, and consumer markets for packaging applications. The Engineered Solutions segment provides high-temperature technology products consisting of custom-blended mineral and non-mineral products for casting auto parts, farm and construction equipment, oil and gas production equipment, power generation turbine castings, and rail car components; and environmental and infrastructure products comprising geosynthetic clay lining systems, vapor intrusion mitigation products, sub surface waterproofing systems, green roofs, wastewater remediation, drinking water purification technologies, and drilling products. In addition, this segment provides chromite products; gunnable monolithic refractory products and application systems; monolithic refractory materials and pre-cast refractory shapes; refractory shapes and linings; carbon composite and pyrolitic graphite; and filtration and well testing services. It markets its products primarily through its direct sales force, as well as regional distributors. The company serves in the United States, Canada, Latin America, Europe, Africa, and Asia. Minerals Technologies Inc. was incorporated in 1968 and is headquartered in New York, New York.

Haynes International, Inc. develops, manufactures, markets, and distributes nickel and cobalt-based alloys in sheet, coil, and plate forms in the United States, Europe, China, and internationally. The company offers high-temperature resistant alloys used by manufacturers of equipment, including jet engines for the aerospace market, gas turbine engines for power generation, and industrial heating equipment. It also provides corrosion-resistant alloys used in various applications, including chemical processing, power plant emissions control, and hazardous waste treatment. In addition, its products also have applications in flue-gas desulfurization, oil and gas, waste incineration, industrial heat treating, automotive, thermocouples, sensors and instrumentation, biopharmaceuticals, solar, and nuclear fuel. Further, the company produces its products in various forms, such as seamless and welded tubulars, slab, bar, billet, and wire. Additionally, it sells its products primarily through direct sales organizations, and network of independent distributors and sales agents. Haynes International, Inc. was founded in 1912 and is headquartered in Kokomo, Indiana. As of November 21, 2024, Haynes International, Inc. operates as a subsidiary of North American Stainless, Inc.

Metallus Inc. manufactures and sells alloy steel, and carbon and micro-alloy steel products in the United States and internationally. The company offers special bar quality (SBQ) bars, seamless mechanical tubes, precision steel components, and billets that are used in gears, hubs, axles, crankshafts and motor shafts, oil country drill pipes, bits and collars, bearing races and rolling elements, bushings, fuel injectors, wind energy shafts, anti-friction bearings, artillery and mortar bodies, and other applications. It also provides custom-make precision steel components. It offers its products and services to the automotive, energy, industrial equipment, mining, construction, rail, aerospace and defense, heavy truck, agriculture, and power generation sectors. The company was formerly known as TimkenSteel Corporation and changed its name to Metallus Inc. in February 2024. Metallus Inc. was founded in 1899 and is headquartered in Canton, Ohio.

Ampco-Pittsburgh Corporation, together with its subsidiaries, engages in manufacture and sale of specialty metal products and customized equipment to commercial and industrial users worldwide. The company operates through Forged and Cast Engineered Products (FCEP); and Air and Liquid Processing (ALP) segments. The FCEP segment produces forged hardened steel rolls, cast rolls and, forged engineered products that are used in cold rolling mills by producers of steel, aluminum, and other metals; cast rolls for hot strip mills, medium/heavy section mills, roughing mills, and plate mills; and forged engineered products for narrow and wide strip and aluminum mills, back-up rolls for narrow strip mills, and leveling rolls and shafts. The ALP segment produces custom-engineered finned tube heat exchange coils and related heat transfer products for various industries, including OEM/commercial, nuclear power generation, and industrial manufacturing; custom-designed air handling systems for institutional, pharmaceutical, and general industrial building markets; and manufacture centrifugal pumps for the fossil fueled power generation, marine defense, and industrial refrigeration industries. Ampco-Pittsburgh Corporation was incorporated in 1929 and is headquartered in Carnegie, Pennsylvania.