That's a great question, and something many people notice when walking through cities. Those shiny stainless steel trash bins are everywhere because they offer a modern, clean look that complements urban architecture. But yes, the short answer is that they can scratch. However, it's a bit more nuanced than that.
Stainless steel is an alloy known for its strength and corrosion resistance, which is why it's a top choice for heavy-use public items. The type often used for bins is not a mirror-finish, but rather a brushed or matte finish. This is a deliberate choice! These finishes are much better at hiding minor scuffs and scratches compared to a perfectly polished surface.
The scratches you typically see are superficial "grazes" from everyday life—being bumped by a bike, scraped by a garbage truck during collection, or from general wear and tear. These fine lines don't affect the bin's structural integrity or its ability to hold trash. They simply become part of the bin's "patina," blending into the textured finish over time.
To maintain their appearance, many city maintenance crews use specific cleaning methods and even occasional polishing with non-abrasive cleaners to minimize the visibility of scratches. So, while stainless steel bins aren't scratch-proof, their design and material make them remarkably resilient and easy to maintain, ensuring they stay functional and look presentable for years.