TENARIS SA

To implement circular economy concepts throughout our industrial system.

• Maximize recycling rates at our facilities.

• Maximize scrap availability and use.

• Reduce the amount of materials sent to landfill by reducing generation, reusing and recycling, including revalorization.

• Minimize pollution.

Our QHSE Policy provides a framework for improvements in resource management, circular economy and material efficiency. In line with our management system structure and objectives, we have established internal procedures to regulate material, waste and chemicals management.

As part of a process of continuous improvement, we look for opportunities to reduce consumption, select better materials, reuse and recycle internally or externally, and ultimately decrease the amount of waste generated and sent to landfill.

Our waste management procedure sets guidelines to ensure that we minimize environmental impact and promote sustainability. Our procedure addresses each stage as follows:

• Prevention: we prioritize the minimization of waste generation by implementing BAT in our CapEx projects. This includes new manufacturing lines, processes, and revamping existing ones. We aim to reduce waste at source in the projects we implement. We evaluate waste generated at our normal activities to identify waste streams looking to minimize generation.

• Preparing for Re-use: we evaluate our processes to find opportunities to re-use materials and waste, both internally and externally in other industrial processes. Our procedure includes stringent rules for the storage of products and waste, which help in maintaining their quality for potential re-use.

• Recycling: we have set internal indicators, and we follow up generation of waste looking to reduce generation, reuse them whenever possible and recycle, making disposal a last resort.

• Other Recovery: we use other recovery options, such as energy recovery, to make use of waste that cannot be prevented, re-used, or recycled. This is part of our broader commitment to use natural resources and energy efficiently and contribute to the circular economy.

• Disposal: we ensure that waste disposal is conducted in a manner that minimizes environmental impact. Disposal activities are performed with authorized companies according to applicable local requirements.

Significant resources and efforts are dedicated to identifying recovery, re-use and recycling opportunities and ultimately, decreasing the amount of waste sent to landfill.

We are committed toworking with our suppliers to improve sustainable business practices by assisting them in identifying risks and opportunities, providing training, sharing knowledge and raising awareness, and, in general, working together to improve the sustainability of our supply chain and our business.

Recycling scrap

As we produce steel using EAFs, the use of recycled scrap is a key aspect of our operations. We have implemented practices to increase the use of recycled scrap. The use of recycled scrap reduces the need for virgin materials (such as iron and coal), lowers CO 2 emissions related to the steelmaking process and enhances circularity.

As a permanent resource, steel is fundamental to achieving a circular economy: it can be recycled infinitely without losing any of its properties. This saves energy, as well as iron ore, coal and other materials, reduces CO 2 emissions, and prevents useful material from ending up in landfill as waste. We focus on several key areas to ensure efficient resource inflows, outflows, and to support circular product design.

We rely heavily on scrap recycling, which is also reflected in therecycling rate for our steel, which reached 81% in 2025.

We are investing significant amounts in scrap management, particularly in Mexico, but also in Romania and Argentina. To increase steel production based on scrap, internal models have been developed to support higher use of scrap and less pig iron, while maintaining product quality. Scrap often contains impurities, particularly copper, that pose a risk for cleaner steel production. We carefully evaluate our sources of scrap to minimize this risk of impurities and to reduce the need for purer iron sources such as pig iron.

In Argentina, the quantity of scrap that can be sourced locally is limited. Therefore, to complement locally sourced scrap in the steel charge, we process iron ore pellets in our natural gas filled DRI plant, to complete the metal charge necessary for operations.

Material management

Production phase

We are also exploring the use of alternative materials in our steel furnaces. In Romania, we participated in the Retrofeed program to test alternative materials for steelmaking and we continue using plastic wastes to partially replace coal. As another example, in our facility in Argentina, where we produce our own plastic thread protectors, we have increased the recycled plastic content from 30% to an average of 60%. We have implemented several improvements across our industrial system, using innovative or established practices that depend on the characteristics of the site, local infrastructure, requirements, and local market, focusing on reducing generation, reusing, or recycling. For example, we have implemented recycling of aluminum cans at the ladle furnace in the Siderca steel shop; the internal use of coating concrete waste in pedestrian blocks at Kabil in Indonesia; recycling ferroalloy and lime dust in Dalmine; and the recycling of wood pallets in several locations, as well as paper, cardboard, oils, plastics, paints, and solvents using different technologies.

We reuse and recycle residues and co-products to cut waste: in 2025, our disposal amounted to 8.5%, an improvement from 9.7% in 2024.

We have maintained reuse and recycle rates for our co-products, with higher volumes for slag, followed by scale and iron fines. Slag, the major waste co-product, is reused and recycled in areas such as building materials, fillers, road surfacing, and concrete, while scale, the second co-product, is used in cement processing or by other steel companies.

Our industrial operations in many regions have achieved more than 90% recycling rates of materials (excluding scrap), especially the steel making sites in Colombia, the UK, among others.

We also continue with our thread protector recycling program in many regions where we operate, reusing or recycling plastic protectors to make new ones or other plastic products.

Use phase

During the use phase, our experts work closely with customers to maximize operational safety and minimize environmental impact. By optimizing the use and service life of materials, we ensure that less material is needed, transported, and handled, resulting in a lower overall impact. We have implemented recycling services focused on plastic protectors to minimize the loss of packaging material. Recovered thread protectors can be used to produce new protectors at our facilities, or they are cleaned, shredded, and used to produce new plastic products.

End of functional life

At the end of a product's functional life, our focus on recycling and reusing materials ensures that they are not wasted. This approach aligns with our goal of achieving a circular economy by promoting reuse, repair, refurbishing, remanufacture, repurpose, and recycling.

We have achieved a high level of material efficiency (a worldsteel indicator), reaching 99% in 2025 for our steel sites, which is above the industry average according to worldsteel. This efficiency is a result of our efforts to reuse and recycle residues and co-products, thereby reducing waste.