Quote:
Originally Posted by 87tdwagen
Agree with Diesel911, anti seize compound is an exhaust systems friend. Also note, there are many grades of metal called stainess, but only the 300 grades 304/316 is truly stainless non magnetic. All 400 series are ferrous and will rust. If in doubt check with a magnet, if it sticks...it will rust.
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All steels are ferrous, i.e., iron based, including all stainless steels.
This is the first paragraph of a Wikipedia article on Stainless steels:
Stainless steel is a group of iron-based alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting and also provides heat-resistant properties. Different types of stainless steel include the elements carbon (from 0.03% to greater than 1.00%), nitrogen, aluminium, silicon, sulfur, titanium, nickel, copper, selenium, niobium, and molybdenum. Specific types of stainless steel are often designated by a three-digit number, e.g., 304 stainless.
Stainless steel's resistance to rusting results from the presence of chromium in the alloy, which forms a passive film that protects the underlying material from corrosion attack, and can self-heal in the presence of oxygen. Corrosion resistance can be increased further, by:
- increasing the chromium content to levels above 11%;
- addition of 8% or higher amounts of nickel; and
- addition of molybdenum (which also improves resistance to "pitting corrosion").
The matter of a grade of stainless steel being magnetic or non-magnetic is not related to corrosion resistance; it is a separate property related to grain structure (ferritic, austenitic, or martensitic).