D. Darrin Sanders Moderator. When he plunged them into water to cool them off, they shattered into 32 pieces. In the above research example, 52100 steel commonly used in ball bearing applications (the AISI equivalent of En31 steel) is subjected to high resolution microscopy to analyze differences between raw metal, metal with heat treatment, and separately, cryogenic processing of metal followed by heat treatment. The extra carbon makes heat treating more complex. Heat Treating Forum on KnifeDogs . The cryogenic treatment of metals for the purpose of increasing wear resistance and permanent stress relief, with a single throughout treatment, is fast proving itself more than just a fad. Usually this cooling is done very quickly. Think this came from Larrin Devin Thomas son. Tempering down to 400-500°F results in 1-2 Rc lower than without cryo. from $21.95. a) Preheat the steel per the manufacturers recommended heat treating schedule. The heat treatment of each steel is unique to its performance. reduction in internal stresses in the martensite developed during car-bide precipitation, which in turn reduces tendencies to micro-crack. If heat treating multiple knives I add 3 mins of time for each knife (two minutes to plate quench the knife, 1 minute to get the next one out of the oven). PETERS’ Heat Treating, INC is among the best in north America. How thick is your steel? The purpose of the cryogenic treatment is to stabilize the microstructure of the tool steel. Heat treatment is followed by computerized deep cryogenic treatment at -320oF by Cryogenics International to further improve the high standards of the blades. If this temperature is near the lower part of the range, the results are unsatisfactory. “Heat treatment provides stress relief and stabilization,” said Pete Paulin, CEO of 300° Below Inc., a Decatur, Ill., company that offers cryogenic processing services. Cryogenic Treatment: Refrigeration treatments should typically be performed after the temper, and must be followed by a second temper. Quart . Add to Cart HW101 Hamon Glop. Quick View Size. Thread starter Jeff Conti; Start date Jun 12, 2011; Tags cryogenic heat treat; Jeff Conti Well-Known Member. That's my post count: based in practice in the field, and dedicated to stop myths, wives' tales, and ignorance in my tradecraft. HW101 Hamon Glop. Pint . Cryogenic treatment for Knife steel. Typical heat treatment cycle using cryogenic treatment. Link to post Share on other sites. The addition of Nitrogen increases hardness, flexibility, and toughness, while providing exceptional wear resistance, ensuring your blade’s … Use your judgment. Heat treatment data without cryo is widely available from different steel manufacturers, such as from Latrobe, Carpenter, Crucible, Bohler, or Uddeholm. Qty. $4.00 each S30V Blades Heat Treating and Tempering $20.00 each Please fill out our Heat treat and Cryo-form. Next, the metal is slowly cooled using liquid nitrogen. below −190 °C (−310 °F)) in order to remove residual stresses and improve wear resistance on steels and even composites. Deep Cryogenic Treatment done in a controlled environment with a CryoHeat processor and special proprietary formula is a very viable stress reliever and can also be used where heat cannot. (Note: Tests indicate that the effect of subzero treatment on high-speed steel may be influenced decidedly by the hardening temperature. Add to Cart Anti-Scale Coating for Heat Treating ATP 641. from $19.95. Some knife makers say you should use liquid nitrogen because it is the colder than the other options. CryoHeat Metal Treatment is a corporation that provides proprietary cryogenic processing to metal objects in San Diego California . This process of “freezing metals” to a cryogenic state is often referred to as an extension of the heat treatment process. 4,619. Raptor 700 - Duration: 6:56. Toughness of D2, PSF27, and CPM-D2. You did not need a soak at -320 degrees. I recently read: Heat Treatment, Selection, and Application of Tool Steels [Paperback] by Bill Bryson (Author). Oct 19, 2011. To perform cryogenic hardening, metal is first exposed to heat using a conventional heat treatment process. But the benefits are not uniform for all steels, and cryo treatment temperatures and soak times do vary. All our knives ares inspected and tested to meet the required hardness. Painstakingly finished to 8-12° per side by expert blade smiths using the traditional 3-step Honbazuke method. Finally, a machine designed with custom knife makers in mind! I was told cryo only needs to be to temp . D2 data from the Latrobe datasheet. Without cryo peak hardness is achieved when quenching from about 1875°F resulting in 64-65 Rc. It can be used prior to; during or after machining of materials. CES designs, engineers, builds, installs and services Batch and Continuous Cryogenic Equipment for the Metal Treatment Industry. CryoHeat is ISO certified and customer satisfaction is guaranteed. Table 1 shows, the wear resistance of different tool steels with the cryogenic treatment. The transformation of the grain structure that takes place during heat treating is further completed during the cryogenic process. However, some small pockets of austenite may not transform and this does not allow the knives to perform as well as they can. $15.00 each (includes CRYO Treatment) ( HTTSP ) Heat Treating & Tempering of Folder Springs and Rockers. It is the deep-freezing of tool steel usually to –250 to –300 degrees F for 2-3 hours. Paul Bos, widely recognized as America's foremost heat treat authority for knife blades, got an early start learning the importance of proper heat treat. I have seen evidence that some steels subjected to specific heat treatment procedures benefit markedly from cryo treatment. Cryogenic hardening is a cryogenic treatment process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid nitrogen.It can have a profound effect on the mechanical properties of certain steels, provided their composition and prior heat treatment are such that they retain some austenite at room temperature. Cryo treatment on transmission gears and bushed intake rocker arms. Even a cold treatment (4% RA) can yield beneficial results but shallow or deep cryogenic temperatures (-196°C) are better (0% RA). You cannot take a piece of soft tool steel and increase the hardness one point through treatment. During heat treating, steel’s microstructure transforms from austenite to martensite, which makes the steel much more wear resistant. I always heat-treat, cryo, then double temper. The CryoHeat process will never change the color of the metal in any way, as it will change with a heat treatment. Once the metal is submerged or otherwise exposed to liquid nitrogen, its temperature begins to drop. Time in liquid nitrogen or dry ice needs to be no longer than for the knife to reach the cold temperatures. He can heat treat most steel up to 27 inches in length. The LTK-27 has internal measurements of 20" L x 12" W x 7" H. We talked with knife makers from around the world and asked them what they are looking for in a cryogenic knife quenching machine, and what they told us was this: 1. Cryo treatment is an industry recognized practice in heat treating and simply wouldn’t exist as an unnecessary expense if wasn’t a legitimate extension of the heat treat, quench and temper process. ( HTTVAS) Heat Treating & Tempering of VASCOWEAR, CRUWEAR, BG42, CPM10V, S30V, S90V. You will likely get so many opinions here that it will tend to lead you a lot of different directions. 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