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September 11, 2026Sources cited
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Stainless steel

Stainless steel is an iron-based alloy known for its resistance to corrosion and rust, mainly because it contains chromium.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated September 11, 2026|2 min read| Fact-checked

Stainless steel is an iron-based alloy known for its resistance to corrosion and rust, mainly because it contains chromium. It is a family of steels with varying compositions and properties, widely used in products and structures that need durability and low maintenance. In Canada, stainless steel is widely used in construction, food service, transportation, healthcare, and resource industries because it combines durability with corrosion resistance in harsh climates.

Composition and corrosion resistance

Stainless steel is an iron-based alloy containing chromium, usually at least 10.5% and often more. Chromium forms a protective oxide layer that limits rusting and helps the surface resist further oxidation.

Grades and families

Stainless steel includes multiple families and grades with different structures and properties. Common categories include austenitic, ferritic, martensitic, duplex, and precipitation-hardening steels.

Properties

Stainless steels are valued for corrosion resistance, heat resistance, durability, and appearance. Their exact mechanical and magnetic properties depend on composition and microstructure.

Uses

Because of their resistance to corrosion and easy maintenance, stainless steels are used in cookware, cutlery, medical tools, appliances, architecture, vehicles, and industrial equipment.

Key facts

  • Stainless steel is a steel alloy whose corrosion resistance comes primarily from chromium.
  • A passive chromium oxide film forms on the surface and can self-heal when exposed to oxygen.
  • It is not completely stain-proof; in some environments it can still corrode or pit.
  • Different grades are created by changing chromium content and adding elements such as nickel and molybdenum.
  • Common applications include cutlery, kitchen equipment, medical instruments, architecture, transportation, and industrial equipment.
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Canadian context

Stainless steel is widely used in Canadian construction, food service, transportation, healthcare, and resource industries because it combines durability with corrosion resistance in harsh climates.

Frequently asked questions

What is stainless steel?
Stainless steel is an iron-based alloy that contains chromium and is designed to resist corrosion and rust.
Why does stainless steel resist rust?
Chromium in the alloy forms a thin protective oxide film on the surface, which helps prevent further oxidation and can heal if damaged.
Is stainless steel completely rust-proof?
No. It resists staining and corrosion better than ordinary steel, but it can still corrode in some environments, especially with chlorides or damage to the surface film.
What are common types of stainless steel?
Major families include austenitic, ferritic, martensitic, duplex, and precipitation-hardening stainless steels.
What is stainless steel used for?
It is used in cutlery, cookware, medical instruments, building cladding, transportation, and industrial equipment.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Stainless_steel
    Supports: Definition, chromium content, passive film, alternative names
  2. Encyclopaedia Britannica — https://www.britannica.com/technology/stainless-steel
    Supports: Composition, chromium range, corrosion and heat resistance
  3. ScienceDirect — https://www.sciencedirect.com/topics/materials-science/stainless-steel
    Supports: Composition, alloying elements, categories, corrosion behavior
  4. Aperam — https://www.aperam.com/stainless/what-is-stainless-steel/
    Supports: Minimum chromium content, alloying elements, general properties
  5. Outokumpu — https://www.outokumpu.com/en/products/stainless-steel-types
    Supports: Common forms, properties, applications, general description
  6. AZoM — https://www.azom.com/article.aspx?ArticleID=2874
    Supports: Grades, chromium content, stainless steel families