I've searched here and google with no luck. Heat Treating 1095 Reference data: ASM Book: Practical Heat Treating by Boyer Written by Tracy Mickley www.USAknifemaker.com 1095 is a high carbon steel with .95% carbon (the 95 in 1095) and is proven, good quality knife steel with good edge retention. 1095 … // --> Heat Treatment Hardness vs Temperature Table Chart. 4 strength and toughness 24 3. Embrittlement was not seen with a 450°F temper of O1 or 1095 so perhaps those are better comparisons with 26C3, though neither of those saw a big jump like with 26C3. It’s hard to predict the optimal heat treatment of one steel based on the results of another. It's for a 1045 forging hammer I just finished but haven't heat treated yet. TYPICAL ANALYSIS: C .90/1.04 Mn .30/.50 P .025 max. This particular chart is for 1095, but will yield similar results from other 10 series high carbon steels. There was no cryo treatment. else Notify me of follow-up comments by email. Example: Purple = 275°C / 5 Jan 10, 2011 #1. nc527. It features a higher carbon content and a polished finish. Machinability. Though the carbon content is higher than 1095, that doesn’t necessarily translate to higher hardness if austenitized at the same temperature. To answer your question on why 4130 and 4140 are not listed in the P-numbers section, I offer my opinion as follows: 4130 and 4140 have mechanical properties that are developed through heat treating. This is the tempering and heat treating process for a custom knife I'm working on. S .050 max Si.15/.30 TYPICAL HARDNESS: Rockwell C 48-51 1095 is quite easy, and if you miss you can just re-heat to conversion temp and re-quench and temper again. Hardening. Tests on 26C3 and Heat Treatment Recommendations. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! However, double tempering may sometimes be preferred. Step 1. Air cool to room temperature between tempers. Excel App. “Steel suitable for razor blades.” U.S. Patent 3,749,568, issued July 31, 1973. Induction Tempering of Steel Time-temperature relationships for short -time tempering cycles were determined. Impurities like phosphorous (P) and sulfur (S) can reduce toughness. Heat Treating 1095 Referencedata: ASM Book: Practical Heat Treating by Boyer Written byTracy Mickley www.USAknifemaker.com 1095 is a high carbon steel with .95% carbon (the 95 in1095) and is proven, good quality knife steel with good edge retention.