The two most common stainless steel grades are 304 and 316. The key difference is the addition of molybdenum, an alloy which drastically enhances corrosion resistance, especially for more saline or chloride-exposed environments. 316 stainless steel contains molybdenum. 304 stainless steel does not.
There is little difference between 304 and 316 stainless steel when it comes to strength, but corrosion resistance is where the 316 truly surpasses the 304.
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