Chem Posted August 20, 2017 Share Posted August 20, 2017 Sorry if this was covered, if it is I couldn't find it. I was recently given a coil spring. He said it was from Toyota tundra. Having worked with spring steel, I was confident I could make some nice knines. I hot cut a small price to test the steel. Problem is that I can't get this spring to harden. File bites easily I to it. I first quenched in oil, twice. Thinking it may be .your oil, I got new oil. Still too soft. Finally I tried a brine ( salt water) quench with the same results. Has anyone worked with coil springs? Quote Link to comment Share on other sites More sharing options...
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