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How does steel rust?

The characteristics of mild steel are very complex. Due to its durability, corrosion resistance, and flexibility, it is an incredibly popular material in the construction field. However, many people wonder if steel rusts?

The answer is obviously yes, mild steel can rust, but this depends on several factors.

🔩 What is rust on steel?

Mild steel rusts easily

Rust is a natural corrosion phenomenon that occurs when mild steel is strongly exposed to air and moisture. It happens when ferrous ions in the steel react with oxygen and water to form iron oxides. Simply put, when water comes into contact with mild steel, iron oxide particles form on the metal surface and deep within.

The problem is that these orange-red particles can cause significant damage to the steel if they are not treated. If your steel sheet isn't too badly attacked by rust, there is a grandmother's recipe. Warm water mixed with vinegar and coarse salt will give your steel new life.

On the other hand, if the damage is too extensive, your steel sheet is beyond repair.

Can stainless steel rust?

For information, stainless steel or 304L stainless is subject to the same rust forces as any other steel, so indeed it can rust. But it has an advantage over other types of metals due to its chemical composition.

Your stainless steel sheet generally contains less carbon (1.2%), which makes it less susceptible to corrosion.

However, this does not mean it is completely immune to rust.

🔩 What factors cause steel to rust and how to protect yourself?

Humid and salty environments

There are a few factors that can increase the risk of a steel sheet rusting. Exposure to humid and salty environments, such as seaports and coastal areas, can accelerate the rusting process. This is why steel must be perfectly treated against marine environments.

If you are planning to renovate your exterior, it is also recommended to protect your steel sheet against weather conditions, whether by the sea or in the countryside.

How to protect your steel sheet? We are going to answer the question together right now!

How to protect your steel from rusting?

You are afraid that your steel sheet will rust over time, don't panic, we have the solutions to your problems:

To protect your steel from salty and maritime environments: you will need to go through powder coating. This is a solvent-free, environmentally friendly application that helps preserve the steel for a long time, between 5 and 15 years. However, it is a technique that is relatively expensive but remains highly effective.
In natural environments: it is possible to protect mild steel from rust by using protective coatings such as paint or galvanization. These coatings can provide a protective barrier against air and moisture, significantly reducing the risk of rust.

Warning: Galvanization, however, remains complex unless you have the necessary skills to galvanize your steel sheet. To galvanize a steel sheet, you must immerse your sheet in a molten zinc bath at a temperature of 450°.

🔩 Is there a steel that doesn't rust?

The material in question is galvanized steel or, in technical terms, S235JR anti-rust galvanized steel sheet. The strong point of a galvanized sheet is that it does not rust and has high mechanical strength. If you didn't know, galvanized steel is widely used in urban furniture such as street lamps, highway guardrails, roofing...

But there is still a risk. Be careful with repetitive impacts and cracks in the metal as they will allow oxidation to develop deep inside. In this situation, the steel will start to rust because it will no longer be protected by the galvanization.

You need more information about our entire range of metal available at John Steel:

Posted in: How to Make a Stainless Steel Sheet Shine? ✨

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By: Céline On 2025-10-21

Bonjour , j'ai des décorations en acier pour mon jardin et je souhaite les garder rouillées, il y a t il un entretien particulier?

Replied by: John Steel On 2025-10-21 La rouille se conserve très bien, il suffit juste de la stabiliser :
- Laisser rouiller jusqu’à la teinte désirée
- Puis appliquer un vernis mat extérieur ou huile de lin térébenthine
- Un léger entretien annuel suffit

Si c’est de l’acier corten, quasiment aucun entretien - il se protège tout seul.
Il ne faut surtout pas poncer ni peindre, on fige simplement la patine.
By: Léo Lafrenière On 2025-03-30

j'ai acheté des chaises de jardin, elles sont en acier, peinte en noir. Tous les montant sont vide à l'intérieur et l'eau de pluie s'y insère. Alors au bout des pattes la rouille sort et tache mon patio. Il en sort ailleurs, soi aux joints du siège avec les pattes (derrière nos genoux lorsqu'on est assis). Résultat, ça tache de rouille la pierre de mon patio, et notre linge. Je pense qu'il n'y a rien à faire, ou retourner ces chaises au marchand. Qu'en pensez-vous ?

Replied by: John Steel On 2025-03-31 Bonjour,
Votre problème est malheureusement courant avec certains mobiliers en acier creux non bouchés. L’eau s’infiltre, rouille l’intérieur, puis ressort par les extrémités ou les soudures, causant des taches sur le sol et les vêtements.

Vous pouvez essayer de :

Vider l’eau et sécher l’intérieur,

Ajouter des bouchons sous les pieds,

Appliquer un traitement antirouille,

Protéger les chaises de la pluie.

Mais si elles sont récentes, il serait pertinent de contacter le vendeur. Ce type de défaut peut justifier un retour ou une réclamation.

Cordialement, John Steel.

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How does steel rust?

🔩 What is rust on steel?

Mild steel rusts easily

Can stainless steel rust?

🔩 What factors cause steel to rust and how to protect yourself?

Humid and salty environments

How to protect your steel from rusting?

🔩 Is there a steel that doesn't rust?

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