Support BladeForums! Paid memberships don't see ads! I recently got my first batch of 52100 from Alpha. I've been looking for a go to steel for thicker blades (3/16) and was interested in trying the low temp aus. Since it was from Alpha, I normally would go straight to quench, but had some doubts because I was planning on a non-standard heat treat. Tried a small coupon for fun: 1475 for 20 min, quench in P50. Tested anywhere from 60-65, Different reading in each spot. I didn't find this too surprising, so I took the blade I was working on and followed what I understand to be the proper treatments: 1650 air cool 1500 air cool 1400 air cool Aus :1475, 15 min, quench P50. (I let my oven pre-heat to 1475 and stabilize for 1 hour.) Ground the tang clean and tested at 62 consistently. Not the 66-67 I was looking for. So, I'm guessing my oven may be reading a tad off and it it time to make a batch of coupons to nail this down. My question is, since the blade did harden, just not to the extend I need, does that tell me what direction to go in temp? Should I try a lower temp too? Maybe see what a 1425 coupon does along with 1500, 1525 & 1550? Does anyone get their 52100 from Alpha?, If so, what works for you? Most the old conversations seem to be discussing Aldo's steel.