50 grades of stainless steel

The BSSA has selected 50 Grades of Stainless Steel as its theme for 2014. Each week throughout the year, we will showcase one grade and illustrate the variety of corrosion resistant, mechanical and physical properties which determine its suitability for a wide range of applications.




1.4122 is a martensitic grade with enhanced corrosion resistance, comparable to that of ferritic grade 430 and somewhat better than the basic martensitic grades such as 410, 420 and 431.

Approximate Composition - 16% Cr, 0.35% C, 1.0% Mo (EN standard only. No equivalent ASTM grade).

This grade combines the following characteristics:

  • Moderate corrosion resistance, better than 410, 420 and 431
  • Good strength, 550 MPa minimum 0.2% PS coupled with basic toughness 20 J Charpy impact test
  • Good wear resistance
  • Not easily welded due to its high carbon content

1.4122 offers the high strength of a martensitic grade combined with enhanced corrosion resistance due to its higher Cr and Mo addition.

Applications include:

Automotive, pump shafts, drive shafts, food processing, mechanical engineering, cutting tools, construction, control valves, freshwater boat shafts, retaining rings.

Find out more about the 50 Grades of Stainless Steel campaign

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British Stainless Steel Association (BSSA): registered in England and Wales as a private company limited by guarantee; registration no. 07547349