What’s Causing My Stainless Steel To Rust?

Compared to carbon steel, which is made up of iron and carbon, stainless steel contains carbon, iron, and chromium, which encourages the alloy to develop a chromium oxide layer. This layer is what gives stainless steel its optimal rust resistance.

However, even chromium oxide can become a victim of corrosion if you’re not careful. Chromium’s rust-resistance relies on chemistry, which means its protective layer against rust won’t form if the molecules on the surface of the steel are out of balance.

To help keep your business’ stainless steel in good shape and prevent rust from taking hold, consider the following common causes of rust.

Interaction with other iron deposits

It’s common for a foundry to work with different types of metals, but it’s important to keep these metals away from your stainless steel products when they’re in production. Iron objects or steel can leave ferritic deposits behind, which means corrosion can happen where carts, cars, and other iron objects make abrasions or small bumps in the stainless steel.

Even grinding steel or welding near stainless steel can throw iron debris onto stainless and cause new corrosion. That said, if it’s possible, you have to have your stainless steel in a different room in your business.

Stainless steel can also be prone to corrosion in the presence of graphite. When graphite is present, stainless steel can become an anode. When graphite gaskets are used in stainless installations, it can cause galvanic corrosion and metal stress.

Structural damage to the steel

Stainless steel that’s been dented or cracked is capable of trapping stagnant liquid in that dented space. Water that gets into that crack or dent can cause crevice corrosion. This is when the two parts of the stainless steel with liquid trapped corrode enough to cause structural issues inside the steel.

Pitting corrosion can also cause structural damage to the steel. Pitting corrosion starts when salt in the environment causes small pits in the metal. These pits can trap chloride, which leads to non-surface weakening in the steel.

Looking for an induction furnace for sale for your foundry?

Approximaely 50% of the world’s steel is used for infrastructure and buildings, which means it’s important that the steel is not only properly maintained but also properly made. This is where AMELT comes in.

Whether you’re looking for replacement parts, refurbished equipment, or a steel melting induction furnace for sale, AMELT has what your foundry needs. To learn more about our services and parts, contact AMELT today.

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