Finally dialed in my 1095 heat treat after a year of bad blades

I was at a local maker space workshop last Tuesday and a guy there asked me what my soak time was. I told him 5 minutes and he laughed, said for 1/8 inch stock you only need like 90 seconds in the kiln. Tried it on three test blanks and they all came out way harder on the file test. One even rang like a bell when I tapped it on the anvil (which I never heard before). Now I gotta regrind like 8 blades I messed up last month because of my old process. Has anyone else been over-soaking their 1095 and getting soft edges?

2 comments

2 Comments

miles_perez14d ago

Yeah, that "ringing like a bell" thing is real-I thought my hearing was going until I got one to do that too. Over-soaking 1095 is a super common mistake because so many online guides say stuff like "hold at temp for 5-10 minutes" without mentioning thickness. For thin stock like 1/8 inch, you're basically cooking out the carbon bonds if you go past 90-120 seconds at full temp. I started using a stopwatch and pulling blades the second they hit color (even doing a quick normalize cycle before the final quench). Your file test results are the real proof though-if you're skating a file, you're there. Just keep an eye on your grain size when you snap a test piece; if it looks like sugar, you're still good, but if it's coarse and shiny, you're burning it up.

jamiegreen14d ago

That 90 second soak time you mentioned with the stopwatch is the exact same thing that fixed my blades. I used to think I was being thorough with 5 minutes, turns out I was just making soft steel. The grain size tip is dead on too - I snapped a test piece after my old process and it looked like broken glass inside, all shiny and coarse. After a proper 90 second hold and quench, it was that fine matte gray sugar texture you want. I switched to pulling the blade out of the kiln the second it hits non-magnetic instead of waiting, and the ringing sound started happening every time. Took me about 15 test pieces to really trust the shorter time, but now I kick myself for wasting a whole year on bad heat treats.