Originally Posted by Cheechako
Yeah, it's the iron content in the 17-4ph etc and 400 series that does it. With 300 series, when work hardened without annealing it tends to realign the grain structure.... which makes it more magnetic. I spent my working life in an aerospace manufacturing environment
. Had my guys make a lot of neat boat parts! (One was a 6Al-4V titanium fuel tank
for the bilge!) Anyway, I bought a flat bar of 304 stainless to make some parts
out of. Typically these bars are cold rolled on the final pass at the mill. The surface was a little rough, but fortunately , due to the cold work, it was so magnetic my guys were able to put it on the surface grinder (a magnetic table holds the metal in place) and grind it smooth before further work. In the end the assembly was annealed in a vacuum furnace & passivated so it came out well.
Yes. A more complete answer. I simply find it annoying when people complain about "cheep stainless steel" rusting. Ive been a mechanical engineer for over 20yr and can tell you the stainless is anything but cheep
And yes, I have a machine shop down the street that I'm always pestering to make parts
for my boat. CNC's are wonderful machines