[QUOTE] I didn't ignore anything. The page contained a listing of different types of steels used in valves. Can't you read the first sentence: "Valve Steels - Various steels are available, these include the following:"[/QUOTE] nimonics aren't steels, dipshit. http://en.wikipedia.org/wiki/Nimonic and for the steels, three of those listed aren't used any more! but for the ones that are, read the alloy numbers, look them up and note their alloying proportions. a massively dumbed down analogy for you [sic]: if you mix charcoal with sand, how well does it burn? [rhetorical]