This past weekend I did the Washington Knife Show in Kelso. Just about everyone that knows me knows I'm a sucker for old steel. Anyway a fellow I have know from shows since I first started making gave me a box of tiller tines that were marked with Ortulan stamped on each blade. Anyway I emailed this one outfit and they hadn't the slightest idea as to what the steel was. The fellow said that Ortulan would contract out the blades and then they would put there mark on them. Here's a list of steel that I'm pretty sure they aren't: 10 series, 5160, 52100, L-6 and the W series. My thoughts are now that I own the best steel ever for making knife blades. First picture has what the original tine looked like before I annealed and flattened them out. Also a picture of the first blade that is totally heat treated. I hardened the blade in Texaco Type A slow quench and it hardened up fine and did a 400 degree temper. Part of the deal for these blade was for me to make the giver a knife out of them.