I didn't know that. From the Internet "Try the magnet test. If the magnet sticks, it can't be 316, it could be 304. If the magnet doesn't stick, it could be either 316 or cold-formed 304, so heat the part to about 800Β°C, let it air cool and try the magnet again. If it sticks now, it's 304 stainless steel."
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