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David Rea. I'm about to do my first heat treat at home, and my only option for tempering at the moment is to use the kitchen oven. I've heard that residual oil on the blade will smoke and stink, which probably wouldn't help my marriage. 2) Wrap the blade in aluminum foil and leave it on while tempering.
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As such, customers should carefully consider the types of steel and length of blades they intend to work with before selecting a heat treating oven. We recommend the KH or LB series for new knife-maker. The base model KH 414, operating at 120V, begins at $2,051.99 while the larger LB 27, running on 240V, begin at $2,199.99.
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This process, known as tempering, can be done over a fire or using a blowtorch, but the simplest method is to put it in your oven at 400℉ for two one-hour cycles, letting the knife cool between each one. If you're using a different method, heat the knife until it turns a golden, straw-like color, which is typical for 400℉. Note:
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And this video I'm just going to be showing how to temper hardened steel if you want to know how to harden steel go back to a different video of mine temperi.
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Tempering Heat treating leaves the blades very hard but also brittle. After heat treating, blades have to be tempered to reduce the brittleness. Tempering is done by placing the blades in an oven. Usually 1-2 cycles at 350-400 degrees Fahrenheit for two hours and then letting them cool slowly, without opening the oven door.
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Step 5. Temper the Blade. Quenching can introduce excess hardness and undesirable brittleness to your knife. So, to relieve internal stresses and improve toughness, heat the blade up again. This process, called tempering, is slower (up to 2 hours) and at much lower temperatures (around 400°F / 200°C) than your initial heat treatment.
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Preheat the oven to the desired tempering temperature, which is typically around 400-450°F (204-232°C). Place the Blade in the Oven: Once the oven reaches the desired temperature, carefully place the clean knife blade on the center rack of the oven. Use heat-resistant gloves to handle the blade and avoid direct contact with the hot surfaces.
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Cold Treatment Myths. 4. XXXX steel "needs" or "doesn't need" cryo. I see frequently from knifemakers statement like, "I chose AEB-L because it doesn't need cryo.". Or "Carbon steels don't need cryo.". Or "Stainless steels need cryo.". This shows a fundamental misunderstanding of what cryo does or doesn't do.
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Temper the blades for 1 1\2-2 hours, quench in lukewarm water, then put them right back in the oven for another 1 1\2-2 hours. Not knowing exactly what type of steel the rasps are made of, I would probably go with 400 degrees, then test the edge for choppiness. If the edge is chippy, bump the temp up 20 degrees and temper again.
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Step 3: Preheat Your Quenching Liquid. Before quenching, preheat your oil (if using oil) to around 120°F (50°C). Preheating the oil helps achieve a consistent quench and minimizes the risk of thermal shock, which could cause your blade to warp or crack. You can use an oil-safe heating element or simply quench a few heated scrap pieces of.
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Tempering Put the blanks in an oven for 2 hours at 200 degrees Celsius. Wait till the oven is up to temperature before you start the 2-hour timer. Tip: buy a small oven with built-in 2-hour timer. I use a temperature thermometer to measure the temperature of the blanks inside the oven. Rest one of the blanks on the probe.
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After an hour, put on your heat-resistant gloves for safety, and use your pair of pliers or tongs to remove the hot knife from the oven. Let the knife air cool at room temperature for one hour. Return the knife into the oven for another tempering cycle. After an hour of air cooling has passed, place the knife back into the oven for another hour.
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Dave Scott talks about tempering a knife in an oven in this video. https://youtu.be/eZcw730xS7EIf you like this video, subscribe to our YouTube Channel at ht.
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Tempering of 1084 high carbon steel knife. For 60-61 RC set the temperature at 400°F and temper it twice, each cycle for 1 hour. For 57-58 RC set the temperature at 450°F and temper it twice, each cycle for 1 hour. For 55-56 RC set the temperature at 500°F and temper it twice, each cycle for 1 hour.
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O1 Tool Steel. For most applications, heat to 400 - 450 °F. For knives and other cutting tools, heat to the lower end of the temperature range—300 - 375 ºF. Hold for 2 hours (plus 1 hour per inch of thickness beyond 2 inches). Remove from the oven and allow it to air cool to room temperature.
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There are a number of methods you could use to accomplish this, but the easiest (and best for beginners) is to put it in the oven @ 400 degrees for two cycles of one hour each, letting the knife cool between cycles; or until the steel has turned a wheat/golden/brown color. Yes, steel changes color as it is heated.
