You might want to try your local Sandvik Materials Technology service center:
Sandvik Steel UK
Halesowen
West Midlands
PH:0121-504 5100
(I'm not sure as to the accuracy of the phone # its from the back of a data sheet from 1996. You should be able to go to their site and find the link that will get you to their local (to you) service center.)
Sandvik UK say it is not stocked in the UK but are checking with their mill where it should be available. Re Arcelor - I will try to find a contact. Thanks for help.