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.




1.4418 is a martensitic stainless steel with enhanced corrosion resistance and weldability.

Approximate Composition – 16% Cr, 1.0% Mo, 5.0% Ni, 0.04% C (EN composition range. No ASTM equivalent).

This grade combines the following characteristics:

  • Best pitting corrosion resistance of all martensitic stainless steel grades approaching that of 304
  • Good strength. 700 MPa 0.2%PS, 900 MPa UTS at room temperature
  • Excellent toughness, 80 J at room temperature. 40 J at -20°C
  • Good weldability, especially for a martensitic stainless steel. No preheating required. Post weld tempering recommended
  • Good wet abrasion resistance

This grade is designed to achieve a good balance of corrosion resistant and mechanical properties. The chromium and molybdenum provides corrosion resistance. The low carbon and increased nickel content provides a high strength martensitic structure but with good toughness. There are also significant amounts of austenite and ferrite in the steel. This structure also gives a much improved weldability compared to normal higher carbon martensitic grades. It is proving to be a replacement for grade 431 (1.4057) in some applications.

Applications which illustrate these features include:

Mining, cement plants, hydrofoil legs, anti-seismic applications, helicopter landing grids, penstocks, hydroelectric turbine blades, hardboard and chipboard press plate, propeller shafting, pulp and paper.

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


1.4886 N08330