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Etymology of Stainless

The suffix “less” is added to “Stain,” which means rust. This indicates a steel that does not easily rust.

History of Stainless

In the late 19th and early 20th centuries, the development of integrated ironmaking technology made it possible to mass-produce iron, but the occurrence of rust (corrosion) in iron became a problem, so researches on surface treatment (painting, etc.), electrical methods, and addition of alloying elements were conducted. The research on rust prevention by the addition of double alloying elements became the motivation for the development of stainless steel.

    Cr added to Steel

  • knife Blade(1.5Cr)
  • 소첨가: 녹발생, 다량첨가: 성형불량
  • 부식 특성 연구(1820년): M.Faraday(England)

    13% Cr / 17% / Cr

  • 1904 ~ 1907
  • L.Guillet, A.Portevin(France)
  • Giesen(Germany)

    Austenite / Femite / Martensite

  • L.Guillet(France):Presented 3 types of Stainless
  • 1910 ~ 1915(Corrosion properties study)
  • Austenite: Maurer, Strauss(Germany)
  • Ferrite: Daniznen, Becket(America)
  • Martensite: Brearley(England)

Reasons Why Stainless Steel does Not Rust Easily

When stainless steel contains more than 12% of chromium (Cr), the main component, it naturally forms a very thin and dense Cr2O3 layer (passivity layer) to prevent oxygen from entering the metal matrix, making it difficult to rust.

stain_chart

Features of Stainless

  • Excellent design with a beautiful surface
  • High fire and heat resistance
  • Excellent corrosion resistance, less restrictions on the usage environment and hygienic
  • It is easy to deform due to its excellent workability and is strong against external impact due to its high strength.