K03 – 1.4003

K03 – 1.4003

K03 – 1.4003

Our KARA range. A 12% Chromium Ferritic Stainless Steel for welded structures.

Main features

Elevated mechanical properties, excellent weldability, good performance in both natural and moderately aggressive environments, ease of workmanship (both weldability and forming), very good resistance to impact (including welds and at very low temperatures) good fire resistance (M0) and fatigue strength, good corrosion–abrasion behaviour (with a corrosion resistance markedly superior to that of construction steels).


  • Transportation: railway carriages, wagons, containers, coaches and lorries
  • Industrial: hoppers, conveyors, storage tanks
  • Construction: structural elements, profiles (ceilings, floors, walls), light and secondary non-load-bearing structures, foundations
K03 – 1.4003


  • ASTM 403
  • UNS S41003
  • EN 1.4003
  • IMDS ID 336838128

Chemical composition

Typical values

  • C=0.020
  • Si=0.50
  • Mn=0.60
  • Cr=11.00
  • Ni=0.40

Alphanumerical designation: X2CrNi12

Dimensional range


  • Thickness: from 0.80 to 8 mm
  • Width: up to 1,524 according to thickness


  • Thickness: from 0.80 to 8 mm
  • Width: up to 1,250 according to thickness

Flat Bars 

  • Thickness: from 2 to 20 mm
  • Width: 10 up to 300 according to thickness

Surface aspect

  • Hot rolled & Cold rolled
  • 1D, 2B, 2D
  • Also available with polished aspects

According to forms & dimensions.


Whether you need a certificate or more information, you can download all our product brochures, specifications, e-books, and related materials here.
K03 (1.4003)

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