POSCO Holdings Inc. engages in the production of steel products. It operates through the following divisions: Steel, Engineering & Construction and Trading. The Steel division produces cold rolled, hot rolled and stainless steel products, plates, wire rods and silicon steel sheets. The Engineering & Construction division engages in the planning, designing and construction of industrial plants, civil engineering projects, commercial and residential buildings. The Trading division exports and imports steel products and raw materials. The company was founded by Tae-Joon Park on April 1, 1968 and is headquartered in Seoul, South Korea.

Wuhan Kaidi Engineering Research Institute Co. Ltd. is a private company headquartered in Wuhan, China. The firm provides environmental protection consulting services.

Stamicarbon BV engages in the design, licensing, and development of urea plants for the fertilizer industry. It offers fertilizer production, nitric acid, and emission reduction technologies. The company was founded in 1947 and is headquartered in Sittard, the Netherlands.

Research Institute of Industrial Science & Technology, part of POSCO Holdings Inc., is a company headquartered in Pohang, the South Korea. The firm engages in commercial physical and biological research and development.

Kawasaki Steel Corporation (Kawasaki Seitetsu) was a Japanese steel manufacturing company.

NIPPON STEEL CORP. engages in the manufacture and trade of steel products. It operates through the following segments: Steelmaking and Steel Fabrication; Engineering and Construction; Chemicals; New Materials; and System Solutions. The Steelmaking and Steel Fabrication segment produces and distributes steel sheets, plates, bars and wire rods, pipes and tubes, and machinery parts. The Engineering and Construction segment develops steel plants, heat management facilities, and industrial machinery and equipment. The Chemicals segment deals with chemical products, carbon materials, and epoxy resin products. The New Materials segment manufactures and trades semiconductors, stainless steel foils, silicon carbide wafers, carbon fibers, and metal substrates for catalytic converters. The System Solutions segment includes information technology infrastructure services. The company was founded in 1886 and is headquartered in Tokyo, Japan.

Envirocare manufactures and designs pollution control systems.

Xi'an Aerospace Expedition Fluid Control Co., Ltd., established on 2001-05-25, Operating range includes sensors,cable assembly,Measurement and control equipment technology and products,Engine control system and power propulsion system,Fluid Control System Products,Special pump valve,car parts,Thermal combustion engineering products,Non-standard equipment,A set of equipment,analog device,UAV,Rubber and plastic seals,Research and development of environmental protection and energy-saving technology products and water-saving technology products,Production,Sales,Installation and commissioning and after-sales service;Air Pollution Prevention and Control Engineering Construction;Export business of self-produced products and technologies;Raw and auxiliary materials required for production,Instrumentation,Equipment,Import and export business of spare parts and technology;General cargo transportation.(Items subject to approval by law,Business activities can only be carried out after approval by relevant departments)

Primetals Technologies Limited, is an engineering and plant construction company located in London, the United Kingdom. It serves clients in the metals industry, both the ferrous and the nonferrous metals sector. It is a joint venture established in 2015 by merging Siemens VAI Metals Technologies and Mitsubishi Hitachi Metals Machinery.

Sumitomo Metal Industries, Ltd. engages in the steel business. It operates through the Steel and Other segments. The Steel segment includes pipes and tubes, sheets and plates, construction materials, railway parts, castings and forgings, bars, and titanium products. The Other segment comprises of real estate leasing and electronic components businesses. The company was founded in April 1897 and is headquartered in Osaka, Japan

Mitsubishi Kakoki Kaisha, Ltd. engages in the design, manufacture, installation, and sale of plant and environmental equipment. It operates through the Engineering and Machinery segments. The Engineering segment includes city gas and oil-related plants, chemical engineering plants, hydrogen generation plants, sewage treatment and industrial effluent treatment equipment. The Machinery segment includes oil purifiers, separators and filtration machinery, seawater screening facility, mixers and related products. The company was founded on May 1, 1935 and is headquartered in Kawasaki, Japan.

Manufactures and distributes steel pipes

Uhde, a subsidiary of thyssenkrupp AG, is a German company that provides chemical engineering services. Krupp Hoesch AG acquired Uhde from Hoechst AG on January 01, 1996 for $482.09 million.

Tecnochimica Srl is a private company headquartered in Italy. The firm manufactures and exports chemicals products.

JFE Steel Corp. engages in the manufacture and sale of steel products. Its products include steel plates for ships and bridges, steel sheet for automobiles, home electrical appliances, and wall and roof construction, special steel, structural steel, stainless steel, steel rods for construction, and steel-pipe. The company was founded on April 1, 2003and is headquartered in Tokyo, Japan

AREVA GmbH is a company headquartered in Erlangen, Germany and ultimately controlled by the Government of France. The firm designs, manufactures, installs and supplies nuclear steam supply system and nuclear equipment. Reinhold Klaus is the current CEO, occupying that position since 2017.

China Energy Investment Corp. Ltd. engages in coal production, sales, electricity & thermal generation, coal liquefaction & coal chemicals, railway and port transportation. The company was founded on October 23, 1995 and is headquartered in Beijing, China.

Korea Hydro & Nuclear Power Co. Ltd. produces and supplies electric power. It operates nuclear plants in Busan, Ulsan, North-Gyeongsang, and North-Jeonla and renewable energy generation facilities. The company was founded on April 2, 2001 and is headquartered in Seoul, South Korea.

Babcock Hitachi KK develops boilers and energy related technology. It offers energy systems including steam generators for thermal power generation, and environmental-related and nuclear energy-related equipment. The company also offers boiler related equipment, heat recovery steam generator and environmental control systems, nuclear power equipment, plant diagnosis inspection systems, and energy solutions. Babcock Hitachi was founded in 1908 and is headquartered in Tokyo, Japan.

Framatome GmbH engages in the development, marketing, distribution, construction, and supply of systems and components for nuclear power plants with pressurised water and boiling water reactors, as well as fusion and research reactors. It also provides services such as consulting, repair and maintenance of nuclear power plants, as well as supply of equipment for the dismantling of power plants and handling of nuclear waste. The company was founded on April 14, 2016 and is headquartered in Erlangen, Germany.