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.



Hyperduplex (S32707, S33207)

Hyperduplex  grades offer significantly improved resistance to pitting, crevice and stress corrosion cracking and increased strength compared to super duplex grades.

Approximate Composition - 27-32% Cr, < 0.030% C, 7.0% Ni, 3.5-5% Mo, 0.4-0.5% N

These grades combine the following characteristics:

  • Excellent resistance to pitting and crevice corrosion – PREN ~50
  • Excellent stress corrosion cracking resistance in chloride and sulphide
  • Minimum 0.2% PS 700-800 MPa

These grades are used in extreme sea water conditions e.g. high temperatures and high chlorination levels.

Applications include:

Offshore oil and gas e.g. deep water umbilicals, desalination plants, heat exchangers, process industries.

Find out more about the 50 Grades of Stainless Steel campaign

BSSA Home  |  BSSA Membership  |  Contact Us

find us on facebookfollow us on twitter

Park Suite, Forsyth Enterprise Centre, Bramall Lane, Sheffield, S2 4SU
Tel: +44 (0)114 292 2636     Fax: +44 (0)114 292 2633     Email: admin@bssa.org.uk

If you are interested in learning more about our campaign please sign up here.
If you no longer wish to receive emails from us please unsubscribe here.

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