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 frame work for improv ements in resource management, circular economy and material efficiency. According to our management system structure and objectives, we have established internal procedures to regulate the material, waste and chemicals management. Please see“Sustainability Statement -Sustainability in Tenaris – Policies and Procedures”.

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

Our waste management procedure sets guide lines toensure that we minimize environmental impact and promote sustainability. Here’s how our procedure addresses each stage:

• Prevention: we prioritize the minimization of waste generation by implementing BATs 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 wastes 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 or externally in other industrial processes. Our procedure includes stringent rules for the storage of products and wastes, 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 toidentify recovery, reuse and recycling opportunities and finally decrease the amount of waste sent to landfills.

We are committed toworking with our suppliers to improve sustainable business practices, assisting them to identify 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 increasetheuse ofrecycled scrap. The use of recycled scrap reduces the use of virgin materials (like iron or coal), reduces CO 2 emissions related to the steel processand 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 is a way of saving energy, in addition to iron, coal and other materials, as well as producing less CO 2 emissions, and preventing useful material from ending up in landfill as waste. We focus on several key areas to ensure efficient resource inflows, outflows, and circular product design.

We rely heavily on scrap recycling which is also shown on therecycling rate for our steel which reached 82% in 2024.

We areinvesting significant amounts in scrap management, particularly in Mexico, but also in Romania and Argentina. In order to increase steel production based on scrap, internal models have been developed to support higher use ofscrap 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 impuritiesand 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. Thus, to complement locally-sourced scrap in the steel charge, we process iron ore pellets into DRI on site using natural gas tocomplete the metal charge necessary for operations.

Material management

Production phase

Weare also exploring the use of alternative materialsin our steel furnaces. In Romania, we are participating in the Retrofeed program to test alternative materials for steelmaking and are now 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 moved from 30% content of recycled plastic to 60% in average.

We reuse and recycle residue and co-products to cut waste: in 2024, our disposal amounted to 9.7%.

We have maintained reuse and recycling 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 Brazil, Italy, Mexico, Romania and the UK have achieved waste recycling rates of over 90% (excluding scrap), the result of continuous efforts to minimize waste generation and landfill as a treatment method.

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, repurposing, and recycling.

We have achieved a high level of material efficiency (a worldsteel indicator), reaching 98.8% in 2024 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 cutting waste.