50 grades of stainless steel
BSSA

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.

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SiCromAl 1.4713 1.4724 1.4742 1.4762

Molten Metal Processing

Molten Metal Processing

Heat Treatment Basket

Heat Treatment Basket

SiCromAl grades are a series of ferritic heat resisting stainless steels with varying amounts of silicon, chromium and aluminium. They are useful for temperatures up to 1150°C depending on grade.

Approximate Composition:

This grade combines the following characteristics:

  • Good oxidation resistance up to 1150°C for highest grade 1.4762
  • Good resistance to sulphidation 
  • Good resistance to molten metals
  • Moderate carburisation resistance
  • Greater resistance to thermal shock than austenitic grades
  • Can be prone to 475°C embrittlement and sigma phase in some grades
  • Loss of toughness above 900°C due to grain coarsening of fully ferritic structure
  • Much lower creep strength than austenitic grades
  • Poorer weldability than austenitic grades

This series of grades depends on the combined effects of chromium, silicon and aluminium. All of these metals give benefits to the passive oxide layer on the surface of the steel: chromium and aluminium - resistance to oxidation, silicon – resistance to oxidation and carburisation. The absence of nickel leads to better sulphidation resistance than austenitic grades. The lower thermal expansion and higher thermal conductivity compared to austenitic grades makes them more resistant to thermal shock.

Applications include:

Heat exchangers, furnaces, molten metal baths, high temperature nozzles, heat treatment boxes.

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