ESG in metalworking and metal components: a basic guide for companies in the sector

How to implement an ESG strategy in the metalworking manufacturing industry — environmental certifications, carbon footprint reduction and good practice for SMEs.

If you run a metalworking company in Portugal, you have probably received, in recent months, a sustainability questionnaire from a large European client, a request for environmental data from your bank, or a mention of acronyms such as "ESG", "Scope 3" or "EcoVadis" in a commercial meeting.

The question many managers ask

"Where do I start?"

The good news is this: most Portuguese industrial SMEs already put sustainable practices into action every day — from efficient energy management to workplace safety policies, as well as material traceability. What is missing, in most cases, is not action — it is structure. The information needs organising, what is already being done needs measuring, and it needs communicating credibly.

This guide was created for exactly that: to give a clear picture of what ESG means for manufacturing, what is most relevant for the metalworking sector, and how to get started in a practical way without excessive bureaucracy.

What is ESG in industrial practice?

ESG stands for Environmental, Social and Governance — the three dimensions that define a company's performance beyond its financial results:

Environmental

How the company manages its impact on the environment. It includes, for example, energy consumption, greenhouse gas (GHG) emissions, waste management and water use.

Social

How the company treats people — employees, the local community, suppliers. It includes workplace safety, training, diversity and conditions in the supply chain.

Governance

How the company is run and makes decisions. It includes transparency, business ethics, management structure, anti-corruption policy — and also the ability to adapt the business model to new challenges, including the challenges of the sustainable transition.

In manufacturing, ESG is neither a fad nor a communications exercise. It is increasingly a concrete requirement for access to markets, financing and international value chains.

Why is ESG urgent for Portuguese industry?

Three forces are converging at the same time, putting growing pressure on industrial SMEs:

Supply chain

Large European industrial groups and retailers — notably German, French and Scandinavian ones — are demanding more and more sustainability data from their suppliers. Platforms such as EcoVadis have become a supplier qualification filter in sectors such as automotive and metalworking. Not having a structured ESG assessment can mean losing contracts.

Cascading regulation

The CSRD (Corporate Sustainability Reporting Directive) requires large European companies to report detailed ESG data — including data on their supply chain (Scope 3). This means that the large clients of industrial SMEs will need their suppliers' ESG data to meet their own regulatory obligations. SMEs are not directly covered by the CSRD, but they are affected through their clients.

Financing

Portuguese banks, like European ones, are building ESG criteria into their credit risk analyses, in line with guidance from the European Central Bank and the EBA. Companies with no ESG structure at all may face less favourable financing conditions in the coming years.

The most relevant ESG topics for metalworking and metal components

There is no universal ESG strategy. What is material — that is, what has a real impact and is relevant to stakeholders (in sustainability jargon) — varies significantly from sector to sector.

This is a sector with a strong presence in the automotive, aerospace and electronics value chains. The priority ESG topics are:

Carbon footprint (Scopes 1, 2 and 3)

Direct emissions from casting, stamping and surface treatment processes, indirect emissions from the electricity consumed and emissions from the raw materials supply chain (steel, aluminium).

Occupational health and safety

Accident rate indicators, prevention programmes and compliance with workplace safety standards.

Hazardous substances

Management of cutting oils, solvents and surface treatment products (REACH compliance).

Circular economy

Metal scrap recycling rate and extending the useful life of tools and equipment.

Relevant certifications: ISO 14001, SA8000 (working conditions and human rights in the supply chain) and ISO 45001 (workplace safety).

Industrial environmental certifications: what are they and what are they for?

Environmental certifications work as an external signal of credibility — they validate that the company has management systems in place that have been verified by independent bodies. For industrial SMEs, the most relevant are:

ISO 14001

Environmental Management System

The most common environmental certification worldwide. It does not set a minimum level of environmental performance, but it requires the company to have a structured system for identifying its environmental impacts, setting improvement objectives and monitoring results. It is recognised by large European clients as evidence of environmental maturity and is often required in supplier qualification questionnaires.

SA8000

Social Responsibility

A certification focused on working conditions and human rights in the supply chain. Based on the conventions of the ILO (International Labour Organization), it is relevant for companies that supply large groups with demanding CSR (Corporate Social Responsibility) policies — notably in metalworking and automotive components.

Scope 3: what it is and why SMEs need to know

Greenhouse gas emissions fall into three categories (or scopes):

Scope 1

Direct emissions from the company associated with combustion processes

For example, energy consumption for casting and the company's own vehicle fleet.

Scope 2

Indirect emissions associated with purchased electricity

Scope 3

All other emissions

Both upstream (raw materials, suppliers' transport) and downstream (use and end of life of products).

+70%

For most industrial SMEs, Scope 3 emissions account for the largest share of the total carbon footprint — often more than 70%. And this is exactly where large European clients are focusing their attention, since their own regulatory reporting obligations (via the CSRD) include supply chain emissions.

When a large German automotive client or a French aerospace manufacturer asks its Portuguese supplier for carbon emissions data, it is asking for Scope 3 data — which, from the supplier's point of view, are Scope 1 and 2 emissions. As a supplier, your company may be covered here.

Where to start: a practical 4-step approach

Implementing an ESG strategy in an industrial company does not need to be a complex and costly project. Most SMEs have already come a long way — it just needs structuring.

Step 1 — Diagnostic: what already exists?

Before setting any objective, it is essential to map what the company already does. What is the energy consumption? Is there a documented health and safety policy? Does the company hold certifications (ISO 9001, ISO 14001)? Has it already answered an ESG questionnaire from a client? A simple diagnostic identifies the real gaps and avoids duplicating effort.

Step 2 — Materiality: what is a priority for my sector?

Not all ESG topics carry the same weight for every company. A metalworking company should focus on its carbon footprint, workplace safety and the management of hazardous substances. Defining the material topics — based on the sector, the clients and the applicable regulation — lets you concentrate resources where they have the greatest impact.

Step 3 — Metrics: what to measure?

Without data, there is no reporting. And without reporting, there is no credibility. The minimum metrics for an industrial SME include:

Energy consumption

kWh

GHG emissions

tCO₂e

Water consumption

volume consumed

Waste production

and recovery rate

Safety

accident rate

Step 4 — Reporting: how to communicate?

Once the data has been collected, it needs to be communicated in a structured way — whether in a client questionnaire (EcoVadis, Scope 3 questionnaire), a supplier data sheet or the company's own ESG statement.

The VS (Voluntary Standard), developed by EFRAG, is a voluntary standard that gives companies a simplified reporting framework aligned with European standards — with a Basic Module (11 disclosure requirements) and a Comprehensive Module that adds 9 requirements (C1–C9); together, Basic and Comprehensive make 20. Find out more in VS (formerly VSME) explained: a practical guide for SMEs.

Quick wins: concrete actions to start today

For companies starting their ESG journey, these are the actions with the greatest impact and the least complexity:

Environmental

Installing energy meters on each production line is the first step towards greater control, identifying inefficiencies and reducing operating costs
Using the waste inventory the company is already legally required to keep (what is produced, how much, and where it goes) as a basis for identifying opportunities. Seen through this lens, many companies discover recovery possibilities that translate into real savings
Starting to calculate Scope 1 and 2 emissions — it is the basis of any response to questionnaires from European clients

Social

Documenting existing workplace safety policies — many companies have good practices, but do not document them in a verifiable way
Identifying the supplier with the highest social risk in the supply chain (for example, a raw material supplier from a third country) and asking it for a self-declaration of compliance

Governance

Appointing an internal ESG lead — it can be part-time and without creating a new structure
Documenting the decision-making process for investments with an environmental or social impact. Governance includes innovation: recording how the company assesses and adopts new technologies or more efficient processes is a governance element that industrial SMEs often underestimate, but which is very valuable

Conclusion

ESG in manufacturing is neither an academic exercise nor an obligation reserved for large companies. It is increasingly a competitiveness factor — in access to European clients, in relationships with banks and investors, and in the ability to attract and retain talent.

Most Portuguese industrial SMEs have already done a large part of the work. The challenge is not to start from scratch — it is to organise, measure and communicate what already exists, with the right tools and a focus on the topics that really matter for your sector.

Sustanya was built for exactly this purpose: to help industrial companies structure their ESG management in a practical, efficient way that is aligned with the demands of their clients and the European market.

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