Stainless steels are used in many ways on board ships and boats. These range from general fittings for small yachts to tankers carrying aggressive chemicals.
316 (1.4401) grade with a mirror or even electropolished finish is the standard selection for yacht fittings. This ensures good cosmetic performance in the marine atmosphere and with sea water splashing on handrails, portholes, masts and rigging.
Basic chemicals need to be transported in large quantities around the world. The most economic way to do this involves using specially designed ships with large capacity tanks. Typically a load of 5000 tonnes is carried. The wide range of chemicals leads to the use of a number of stainless steel grades including standard austenitic grades like 304L(1.4307), duplex (1.4462), superduplex (1.4410,1.4501) and high alloy austenitic (1.4539, 1.4529,1.4547).
Over the years a detailed list of chemicals, the Chemlog, has been drawn up to show which can be safely transported in stainless steel tankers.