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.



304 Boronated S30460-S30467

This is a series of steels with increasing levels of boron 0.20/0.29% to 1.75/2.25%. It is used entirely in the nuclear industry for neutron absorption.

Approximate Composition - 18% Cr, 12% Ni, 0.20/0.29% to 1.75/2.25% B (Grades found only in ASTM standard A887).

This grade combines the following characteristics:

  • Excellent levels of neutron absorption preventing criticality of nuclear reactions
  • Moderate corrosion resistance lower than grade 304 but acceptable in typical nuclear environments
  • Reduced impact toughness due to formation of borides
  • Formable with care – increased bending radius compared to 304
  • Weldable with care – boron containing consumables
  • Increased levels of tool wear in machining
  • Higher levels of boron facilitated by powder metallurgy due to loss of hot ductility in conventional melting plus hot rolling

Applications include:

Nuclear transport flasks, nuclear storage, glove boxes, nuclear reactor shielding.

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


310 MoLN 1.4466 S31050