Postby DianaGaleM » Fri Oct 17, 2014 5:35 am
A magnet can be used to tell whether or not stainless steel contains nickel.
Stainless steel is made mostly of iron with the addition of chromium and nickel, the former to prevent oxidation (rust) and the latter to resist acid corrosion. The proportions are usually 18/10 or 18/8, the numbers representing the percentages of each, respectively, which may be stamped on the item. The presence of nickel does, however, prevent steel from holding a good edge, so knife blades are usually made without the nickel, that is: 18/0 – a reason even stainless knife blades are prone to pitting if you don't take good care of them.
The presence of nickel also prevents steel from attracting a magnet, which you can easily test on your flatware (and other housewares). In most modern flatware, the blades of hollow-handled knives (i.e., knives with the blade inserted into the handle) will attract a magnet, while the handles will not, whether they are stainless, silver plated, or solid silver.
Of the solid-handled stainless dinner knives I've checked, all attract a magnet for their full length, while the other pieces (forks, spoons, etc.) do not. I guess hardness trumps corrosion resistance.