Acerinox
A Spanish global producer of stainless steel and high-performance alloys.
Last updated September 23, 2026
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Overview
Acerinox, S.A. is a Spanish metals manufacturer headquartered in Madrid and focused primarily on stainless steel and related specialty materials. Established in 1970, the company became one of Spain's major stainless-steel producers and subsequently developed an international manufacturing and commercial footprint spanning Europe, Asia, the United States and South Africa. Its activities cover the production and sale of stainless-steel products, including flat and long products, as well as higher-performance alloys used in technically demanding environments. The company serves a broad industrial customer base. Stainless-steel materials are used in construction, industrial equipment, food processing, transportation, energy and chemical applications, where corrosion resistance, durability, hygiene or heat resistance are important. Through its specialty-alloys activities, Acerinox also addresses markets requiring materials capable of operating under high temperature, severe corrosion or high mechanical stress, including aerospace, energy and chemical processing. Acerinox operates through a network of industrial sites and commercial businesses. Reference material describes the group as having fifteen factories, including five in its stainless-steel division. The company has also sought to increase production capacity and market presence in the United States, an important region for both stainless steel and specialty alloys. Its international development has included strategic acquisitions, notably the purchase of VDM Metals in 2020 and Haynes International in 2024. These transactions strengthened its position in high-performance alloys and expanded its exposure to demanding end markets. The group's history also includes a long-standing relationship with Japan's Nisshin Steel, which helped finance Acerinox's foundation and later increased its ownership stake. Acerinox remains listed in Spain and its business performance is influenced by stainless-steel demand, capacity utilization, nickel and other raw-material prices, energy costs, industrial activity and trade policy. The company therefore combines a globally oriented industrial brand with exposure to the cyclical and capital-intensive nature of metals manufacturing. A serious industrial and environmental incident occurred at the company's Los Barrios plant in Cádiz in 1998, when a cesium-137 source entered the melting process with scrap metal. Radioactive contamination was detected beyond the facility and affected waste-handling and cleanup operations. The incident remains a significant part of Acerinox's corporate history, although the company's continuing business is centered on stainless steel and specialty alloys.
History
Acerinox was established in Spain in 1970 with partial financing from Japan's Nisshin Steel. The company's formation reflected Spain's effort to develop a modern stainless-steel manufacturing base and connect it with international industrial capital and technology. From its initial focus on stainless steel, Acerinox expanded its production capabilities, product range and commercial reach, eventually becoming an international manufacturer rather than a solely domestic supplier. The group developed activities across several regions, including Europe, Asia, the United States and South Africa. Its industrial base came to include multiple factories and processing operations, with reference material identifying fifteen factories in total and five within the stainless-steel division. Acerinox's product portfolio grew around stainless-steel flat and long products, serving construction, industrial manufacturing, energy, transportation, food processing and other sectors that require corrosion-resistant and durable materials. The company also pursued stronger access to the United States, where it sought to increase production and build a more substantial market position. Nisshin Steel remained an important shareholder and financial partner during the company's development. In 2009, Nisshin increased its ownership in Acerinox from 11.3 percent to 15 percent. This relationship illustrated the international character of Acerinox's ownership and industrial development, while the company continued to operate as a Spanish listed group. A major later phase of diversification involved high-performance alloys. In March 2020, Acerinox acquired VDM Metals for €532 million. VDM Metals broadened the group beyond conventional stainless steel into specialty materials designed for demanding conditions, including high temperatures, severe corrosion and high mechanical loads. The acquisition supported Acerinox's exposure to technically specialized sectors such as aerospace, energy and chemical processing. In November 2024, Acerinox acquired Haynes International for $798 million. The transaction further increased the group's specialty-alloys capabilities and reinforced its position in markets requiring advanced nickel-based and other high-performance materials. Acerinox also sold its Bahru Stainless subsidiary for $95 million, reflecting ongoing portfolio management alongside expansion in specialty materials. The company's history includes a significant industrial accident in 1998. At the Los Barrios plant in Cádiz, a cesium-137 capsule contained in a shipment of scrap metal was inadvertently melted. Radioactive material entered the atmosphere, and monitoring authorities in France, Germany, Italy and Switzerland detected elevated traces of ionizing radiation. Two other plants in Huelva and Badajoz were also affected by waste transported from the Acerinox site. Cleanup operations involved thousands of tonnes of radioactive waste, and the incident generated substantial production, remediation and storage costs. Today, Acerinox is a listed international materials group whose identity combines large-scale stainless-steel production with specialty and high-performance alloys. Its operating environment remains shaped by industrial demand, global metals prices, raw-material availability, energy costs, international trade measures and the capital requirements of operating heavy manufacturing facilities.
- 2024
Haynes International acquisition
[1]Acerinox acquires Haynes International for $798 million, reinforcing its specialty-alloys platform.
- 2020
VDM Metals acquisition
[1]Acerinox acquires VDM Metals for €532 million, expanding into high-performance alloys.
- 2009
Nisshin Steel increases its stake
[1]Nisshin Steel raises its ownership in Acerinox from 11.3 percent to 15 percent.
- 1998
Los Barrios cesium-137 incident
[1]A radioactive cesium-137 source is accidentally melted with scrap metal at the company's Cádiz-area plant, leading to contamination monitoring, cleanup and waste-storage operations.
- 1970
Acerinox is founded
[1]Acerinox is established in Spain with partial financing from Japan's Nisshin Steel and begins developing its stainless-steel manufacturing business.
Products and positioning
A globally operating industrial materials supplier serving stainless-steel and high-performance-alloy applications across construction, manufacturing, energy, transportation, food processing, chemical processing and aerospace.
Stainless steel
Stainless-steel flat products
A core Acerinox product family comprising stainless-steel sheet, plate, coil and strip-related flat materials. These products are supplied to construction, industrial equipment, energy, transportation, food processing and other applications requiring corrosion resistance, durability, hygiene or heat tolerance. Product specifications vary by grade, finish, thickness and customer use.
Stainless steel
Stainless-steel long products
Long stainless-steel materials used in industrial manufacturing, engineering structures, equipment and component production. The category covers products whose dimensions and forms are optimized for fabrication and structural or mechanical use. Acerinox's long-products activities complement its large flat-products business and serve customers across multiple industrial markets.
Specialty alloys · 2020
High-performance alloys
Specialty materials designed for environments involving high temperature, intense corrosion, pressure or demanding mechanical performance. Acerinox expanded this business through VDM Metals and Haynes International. The materials support technically demanding applications in aerospace, energy, chemical processing and other industries where conventional stainless steel may not provide sufficient performance.
Controversies
1998
Los Barrios cesium-137 contamination incident
A cesium-137 capsule present in scrap metal was accidentally melted at Acerinox's Los Barrios factory in Cádiz. Radioactive material was released, and elevated readings were detected across parts of Europe. Waste transported from the facility also affected plants in Huelva and Badajoz. Cleanup involved approximately 7,000 metric tonnes of radioactive waste placed in storage at Mendaña Marshes in Huelva. Reported costs included lost production, cleanup and waste storage.
Brand decisions
2024
Acquire Haynes InternationalM&ABackground
Acerinox continued its strategic expansion in specialty and high-performance alloys.
Action taken
The company acquired Haynes International for $798 million.
Aftermath
The acquisition strengthened Acerinox's position in advanced alloy materials and demanding industrial end markets.
Acquisition price. $798 million (November 2024)
2020
Acquire VDM MetalsM&ABackground
Acerinox sought to broaden its materials portfolio beyond mainstream stainless steel and increase its participation in technically demanding alloy markets.
Action taken
The group acquired VDM Metals for €532 million.
Aftermath
The transaction expanded Acerinox's high-performance-alloys business and its exposure to aerospace, energy, chemical and other specialized applications.
Acquisition price. €532 million (March 2020)
- Sell Bahru StainlessM&A
Background
Acerinox adjusted its portfolio while concentrating on its broader stainless-steel and specialty-alloys activities.
Action taken
The group sold its Bahru Stainless subsidiary for $95 million.
Sale price. $95 million
Recent events
North American Stainless halts production at Ghent plant[3]
Reported:
North American Stainless reportedly had to halt production because a shortage of domestic truck capacity contributed to a scarcity of industrial gases used in production, disrupting normal operations at its Ghent, Kentucky plant.
- Unconfirmed
Acerinox proposes 300 job cuts[4]
Reported:
Acerinox communicated a proposal to cut 300 jobs to the CNMV and said it would also communicate the proposal to the Company Committee for its Campo de Gibraltar factory.
Sources4 sources
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