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Rusty metal screws

Does Stainless Steel rust?

Stainless Steel vs the elements

Francesca Betts | Product Guides

What is Stainless Steel?

Stainless Steel is an alloy of Iron and Carbon; containing at least 10.5% Chromium and less than 1.2% Carbon, alongside other elements. It boasts many superior benefits which are suitable for a wide range of applications in comparison to other metals.

Stainless Steel is manufactured in a range of grades which have varying characteristics such as material composition, resistance, strength, mechanical properties, aesthetics, sustainability and hygiene.

Does Stainless Steel Rust?

Unfortunately, the answer to 'Does Stainless Steel Rust?' is not as straightforward as saying yes or no; there are many external factors which must be considered in order to provide an accurate answer. 

Stainless Steel is the generic name used to describe a wide range of alloys which are categorised by grade; with each grade boasting it's own unique characteristics. 

Stainless Steel in a warehouse

Stainless Steel Features

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Corrosion Resistance

The amount of corrosion resistance that Stainless Steel has is dependent on a variety of features and the environment that surrounds it.

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Sustainability

All Stainless Steel materials can be fully recycled into new products; making them an environmentally friendly material.

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Aesthetics

Stainless Steel can be manufactured with finishes such as matte,brushed and engraved.

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Mechanical Resistance

Each grade of Stainless Steel has it's own strengths; from density to tensile strength.

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Hygiene

Some Stainless Steel grades have a better resistance to cleaning chemicals than others. As well as this, each grade has a different surface roughness; the rougher the surface, the easier it is for bacteria to hide.

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Chemical Resistance

Each Stainless Steel grade has a resistance to different types of chemicals such as acid, saline water and alcohol.

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Temperature Resistance

Each Stainless Steel grade has a varying range of temperature resistance.

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Cost

Stainless Steel grades have varying costs attached to them; predominantly due to their material composition.


Material Selection Table
Grade Features Products Applicable environments and applications
A1 / 303
  • High carbon content
  • Easy to cut and weld
  • Low corrosion resistance
  • Free-machining
  • Automotive applications
  • Aviation applications
  • Fabrication
  • Food production
  • Pharmaceutical 
  • Welding
A2 / 304
  • Common grade for fasteners
  • High Chromium content
  • Resistant to corrosion and oxidization
  • Resistant to corrosion in fresh water
  • Bright finish
  • Catering
  • Pharmaceutical and medical applications
  • Automotive applications
  • Construction industry
A4 / 316
  • Marine Grade
  • High Molybdenum and Nickel content
  • Bright finish
  • Marine based environments
  • Outdoor environments
  • Humid environments
  • Food and Chemical applications
  • Industrial applications

For further technical information, take a look at our Stainless Steel chemical resistance and Stainless Steel quivalent grade blogs.


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Francesca Betts

Website Product Assistant with a keen interest for sustainability within the industry