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.



1.4886 N08330

1.4886, often known by its Rolled Alloys brand name RA330®, is a high temperature austenitic stainless steel with superior performance to standard grades such as 310.

Approximate Composition – 18% Cr, 35.0% Ni, Si 1.25%, 0.05% C (Exact composition ranges vary between EN and ASTM standards).

This grade combines the following characteristics:

  • Excellent oxidation resistance up to 1150°C
  • Excellent carburisation resistance up to 1150°C
  • Excellent thermal shock resistance
  • Good resistance to oxidising sulphur atmospheres
  • Excellent resistance to sigma phase formation
  • Excellent stress corrosion cracking resistance
  • Good weldability

This grade is regarded as one the best all-round high temperature stainless steels due to its chromium and high nickel content. Indeed, it is classed as a nickel alloy in the UNS system. The addition of silicon gives it carburisation resistance. Its fully austenitic structure and the absence of elements such as molybdenum give it a high resistance to forming embrittling sigma phase.

Applications which illustrate these features include:

Muffles, retorts, heat treatment baskets, refractory fixings, salt pots, radiant tubes, conveyors, furnace fans.

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