There are a vast array of different stainless steel types which can cause a lot of confusion.
The most popular grades are :
Generally - pick A4 grade if parts are used in any marine environment or, on land but close to the sea.
For Specific information on all the different grades available and further information on suitability of use/welding etc see :
Here you will find further categories such as Corrosion & Oxidisation : http://www.bssa.org.uk/topics.php?category=9
SUPPLYING STAINLESS STEEL GOODS TO WELL KNOWN COMPANIES AROUND THE GLOBE
TRADE ACCOUNT APPLICATION
Unit 9, Thesiger Close,
Worthing, BN11 2RN, UK
Phone: 01903 331391
Company Reg: 03554943
VAT No. GB 717414935