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The lead I know to be present is certainly in steels. We use 12L14 and 41L40 for specific jobs and the presence of the lead is to increase machining speeds for high production. the material is slightly more expensive. It is way easier to machine than non leaded.
Here's another tip that I use !!To tell the difference between 304 stainless and 316, I use a rare earth magnet (those realy strong ones ).304 will have no attraction, but the 316 will attract the magnet slightly.Here's another confusing thing about stainless. I use 304 "J" bends for doing exhaust. A rare earth magnet won't stick to the straight part, but will where the tubing has been bent. I still have not figured out why this happens. Would love the answer to this !!Here's the chemistry makeup of 316 stainless;Chemistry % by WeightFe 62.045-72%Cr 16-18% Ni 10-14% Mo 2-3% Mn 2%N 0.1%S 0.03% C 0.03%Si 0.75% P 0.045%As you can see, there's no lead (pb) present.