So I got a chance to check out a specialties metals dealer yesterday (All Metals in Oroville, Ca.). I was disappointed at the selection of available material but hey, I didn't really expect much for this area. Checking out their catalog they do some "drill rod" O-1, W-1 and A-2 and I was able to get some copper and SS bar for fittings. Anyway, moving on, while looking through the catalog I noticed a mechanical properties sheet that listed 5160 as having 3 to 7 points of Ni ! Now this is the first time I've ever seen Ni associated with 5160. Can anybody verify if this is true? I checked a couple of other references and found no mention of it in them.