M390. Pitting is particularly a problem in salt water. Spyderco Para Military 2 Knife. $205.00. While there are some parallels, such an improving wear resistance, the analogy fails in the prediction that carbides can "pop out" of the matrix. The steel was designed and produced in collaboration with Buderus Steel as a version of Uddeholm AEB-L modified with nitrogen and vanadium. The steel was then tempered at 300, 350, 400, or 450°F. Therefore the corrosion resistance of Nitro-V may be somewhat better than AEB-L depending on the environment. It also performs well with both coarse and highly polished edges. To check your heat treatment against mine, it is best to perform heat treatments from a range of austenitizing temperatures and going straight into the cold treatment used, whether freezer, dry ice, or liquid nitrogen. Check hardness and austenitize no higher than the peak hardness. The compositions of the two are similar and the micrographs also look very similar in terms of carbide content. You can read about those limits in this article on nitrogen additions. KnifeNews delivers today's news for knife people like us. Become a patron and gain access to awesome rewards including early access to articles or a Knife Steel Nerds mug! I don’t know if a 400°F temper would see similar results. Thank you for the very detailed write up! It would be helpful to see 14C28N in your toughness comparison graphs and in the Edge Retention table, since 14C28N is arguably its closest competitor among affordable high-N steels. In Stock . Am I misunderstanding the graph or some other subtlety of metallurgy or is AEB-L really that much tougher? $217.00. That means that the 2000°F austenitize likely leads to a decrease in strength and toughness. Thanks to Brad Ettinger, James Henley, and Edgar Candela for becoming Knife Steel Nerds Patreon supporters! In this section, we’re going to compare our steel with other steels, and for this, I use four criteria; Edge Retention, Corrosion resistance, Ease of Sharpness, and Toughness, and I use a scale or note from 1 to 10. Does that mean the process recommended above skips the pre-heat/equalizing (15min hold at 1500F) step in NJSB’s own heat treating guide? Few steels can approach this level of hardness while remaining usable in cutlery applications. I heat treated the specimens and Mike Pierce kindly machined them for me. Low alloy steels see all of their carbide dissolve at forging temperatures and high heat treating temperatures which allows the grain size to grow rapidly. Thanks Larrin. Nitrogen is not as prone to form nitrides with chromium as carbon is to form carbides. The nitrogen addition, however, did not increase chromium in solution for enhanced corrosion resistance and the vanadium addition was insufficient for grain refinement according to simulation software. $140.00. We are all familiar with the surface voids produced in concrete when a stone from… New comments cannot be posted and votes cannot be cast. SALE* $339.95 $209.95 Enter your email address to subscribe to this blog and receive notifications of new posts by email. Therefore the vanadium is likely doing very little in Nitro-V. Like other stainless steels Nitro-V has high hardenability so it can be cooled in air or plate quenched for hardness. The similar peak hardness of Nitro-V and AEB-L may therefore indicate that the amount of chromium in solution is similar. CTS-204P is made by the USA-based Carpenter Technology Corporation and CPM-20CV is manufactured by Crucible Industries. Required fields are marked *. 1) toughness is on somewhat of a log-scale, meaning 5 vs 10 ft-lbs is a bigger difference than 25 vs 30 ft-lbs. Here is a chart showing the relative position of AEB-L to get an idea of where Nitro-V likely sits: Nitro-V looks very similar to AEB-L with a nitrogen and vanadium addition. The ATAC, designed by legendary custom maker J.A. Join knife companies and subscribe to the KnifeNews email. Although it is officially MT24 (Mule Team 24), it leapfrogged the MT23 to get it into users’ hands faster. But, it’s not easy to work with, and few knife makers have been able to rise to the challenge of machining, grinding, and sharpening it. You can read about why hardness is limited by retained austenite in this article on Vanax steel. Presented by: Work Sharp Knife & Tool Sharpeners Hello and welcome: the Readers’ Choice Awards poll is open – check it out below! 14C28N, however, has significantly more chromium in solution, which likely gives it better corrosion resistance than Nitro-V and AEB-L. Nitrogen can also help improve corrosion resistance, when it comes to pitting it has 16 times the contribution of chromium. The peak hardness of Nitro-V is relatively similar to AEB-L and 14C28N. Alongside the Maxamet models, Spyderco also announced a new “Zome” edition of the Delica 4 (shown below) and Endura 4. Grab a Pack of 5 Microfiber Blade Sleeves for $8.99 < <. Thor DS93X. Therefore I recommend austenitizing no higher than 1950°F. You can get Nitro-V in 1/4″ though. The blade shape, a clip point in most spec sheets, has a nice gradual belly, and a very flat spine, once you’re past the *sharply jimped* thumb ramp. Who uses it: Benchmade, Zero Tolerance. The Spyderco Para 3 offers the same great ergonomics of the Paramilitary 2 in a smaller, more urban friendly package.
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