The latest industry news—straight to your inbox. If it is truly "mild" which is .20% carbon or less IIRC, it does not matter what liquid you quench it in! It is ideal for achieving the required strength and hardness properties on many alloys. It's motor oil; compounded for internal combustion engines running at elevated temperatures. Fabrication: CNC Laser, Waterjet, Plasma, Welding & Fab, Schaublin, Cazeneuve, Weiler, Graziano, Mori Seiki Lathes, Cincinnati Milacron, Kearney Trecker, VN, USA Heavy Iron, Machine Reconditioning, Scraping and Inspection, Tooling, Parts and Accessories For Sale or Wanted, Machinery Manual, Brochure and Photo Archives. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. Swords, daggers, kitchen cutlery, carving chisels, etc. Quench Oil is oil used to harden steel by controlling the heat transfer during the quenching process. To quench with oil, a heated part is lowered into a tank that is filled with some type of oil. I    Oil. Depends on the oil. Sour Crude - Production and Processing, Cyber Security Practices in the Oil and Gas Industry, Flare Management for Efficient Operations, Steering Smart Operations through Digital Oil Field. Don't use motor oil. © 2020 Copyright Practicalmachinist.com. Oil Quenching. I don't know why some regard motor oil as a panecea for the home shop owner's lubrication requirements. When selecting the oils, one must look into the list of properties, features, and chemistry of the fluid. M    It is used to formulate the oil during the quenching operation to achieve consistent metallurgical properties. A subreddit for the metalworkers who specialize in forging knives and other blade tools. I figure preheating the oil does one of two things. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. #    Z, Copyright © 2020 Petropedia Inc. - In most cases with oils, the reason to preheat is the viscosity reasoning. If the work is not tempered right … A common misconception is that quench cracks can occur only while the piece is being quenched. Quench Oil is one of the logical and best choices for the gears. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. We'll bring you the most relevant peer-to-peer conversations happening in the trade and tips and tricks to help you get the job done. Quench Oil is oil used to harden steel by controlling the heat transfer during the quenching process. S    J    Come in, look around, ask a question, learn, and have fun. Sign up for our eNewsletter now to stay in-the-know. Depends on the oil. In most cases with oils, the reason to preheat is the viscosity reasoning. - Renew or change your cookie consent, Mobile Tools: A Disruptive Technology for Oil & Gas Operations, Pipelines: Lifelines of the Oil & Gas Industry, How Big Data is Transforming the Oil & Gas Industry, Sweet vs. Press question mark to learn the rest of the keyboard shortcuts. As far as we know, motor oil has been used for quenching since the 19th century. It either lowers the shock for the quench, making fractures and bends less likely (hope it's this one, because it didn't happen) or it hardens better because it makes the oil less viscous, meaning it can transfer heat away from the blade better. I'd always read to preheat it. I've got a few knives out in the wild and haven't heard of any issues yet. For process monitoring and trouble-shooting, the heat treater should develop an historical record, similar to the chart shown in Figure 1, of viscosity variation in his tank. The oil can also be flushed through the part. Through proper formulation and blending, a wide range of quenching properties can be achieved. R    As a side note, pyrometer with a two brick gas forge... yeah, no chance. Some other characteristics of these oils are that they are biodegradable, have low-foaming nature and add functionality to the process. Making an improper selection of steel for the process. W    Now, after all of that, I'd refer you to my comments in another thread that talk about using O1 without good heat process controls. G    Petropedia Terms:    V    As previously discussed, a quench oil’s quenching performance is dependent on its viscosity. Viscosity should be monitored periodically at 40°C using ASTM D445. Asset Integrity Management Key for Smart Operations, Oil & Gas Retailing Secondary Distribution Processes. Water. P    Emulsifiers are often added to allow easy cleaning of the metal after quenching. B    Does this work? I heard that if one quenches in used motor oil, mild steel will absorb carbon and improve its hardening properties. At a lower viscosity, convection currents can more easily move hot oil away from the interface with the blade. When you oil quench steel forgings, there’s also less risk of cracking compared to water quenching or polymer quenching. O    This is not true. Oil is able to quench heated metals much more rapidly than compressed air. Great, I was using vegetable oil. Regardless of it benefits, it has some issues regarding Quench Oil like safety, availability, and disposal. L    Q    X    Fell back on the old magnet on a stick. The chemistry of oils is divided into four major categories, i.e., straight oils, synthetic fluids, water soluble fluids, and microdispersion oils. T    N    What were you using, and what was the temperature in the shop? C    There's plenty of people starting out with exactly my set-up and yours and they are doing just fine. Pre-heat to around 120 degrees before quenching. Canola oil is cheap, non-toxic, and is a good quench for a variety of simple carbon steels such as 5160, 1084, and 80CrV2. K    U    The YouTube vids I've watched suggest preheating to prevent warping. That being said, you should be agitating the blade in the quench anyway, which not only help this, but also helps break up the vapor jacket that forms around the blade during quench. Press J to jump to the feed. Terms of Use - It is not absolutely vital to pre-heat the oil, it will probably turn out fine without pre-heating, but I went ahead and did it anyway. Had zero temperature control lol. Get your oil in your heat resistant container, and pre-heat it to about 130 degrees (Fahrenheit). Further reading showed that carburizing takes place at certain temperatures over time along with other critical components like a carbon source. F    I hardly think a few second exposure to the carbon in an oil quench would have significant effect. All Rights reserved. Advantages of Oil Quenching Steel Forgings, Machined Parts, Gears and Tooling Oil quenching is a common method for hardening alloy steel forgings. Coal Seam Gas: An Unconventional Alternative? Different types of oil are often used depending on the application because of their varying cooling rates and flash points. Register for the world’s largest manufacturing technology forum for free today to stay in the know. Anyone know which? A    I've done exactly what your doing with o1 and I think you're good. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. Since then, many advantages have been made in their advancement. According to a survey, it is noted that 60 to 100 gallons of Quench Oil are required every year. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. As the other person pointed out, more precise tools are always preferred and I wouldn't consider anything I do half assed due to lack of more precise tools. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. Learn more about us. This website or its third-party tools process personal data (e.g. According to a survey, it is noted that 60 to 100 gallons of Quench Oil are required every year. To learn more, please refer to the cookie policy. I am by no means an expert, but as an amateur with a few years and blades under my belt I don't see any issues with what you're doing. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Powered by vBulletin® Version 4.2.5 One maddening thing about this is there are several references on line and in the literature (including Machinery's Handbook) that describe various carburizing methods and all of them include oil quench as a carburizing method. D    Besides health issues, motor oil is not the right quench speed for blade steels, at least. Not too fussed either way, because a file at touch it how it came out so it must be a half decent job! Subscribe to our free newsletter now - The Best of Petropedia. Privacy Policy Due to degradation, oil viscosity changes with time. New comments cannot be posted and votes cannot be cast. At a lower viscosity, convection currents can more easily move hot oil away from the interface with the blade. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. For instance, the hot oil which has small parts has high hardenability with minimum distortion. H    You can heat it up on your stove if you like, the way I did it was by heating a piece of rebar in the forge, and then dunking that into my quench. Apart from hardenability, the oil can tolerate some other factors like thickness, degree of distortion and geometry. E    If the steel is an oil-hardening steel, the use of these overly aggressive quenchants will lead to cracking. Oil Quenching Explained. Y    Ignorant rubes will insist that motor oil adds carbon to steel quenched in it but it wont. What were you using, and what was the temperature in the shop? It is versatile in nature thus it enhances the performance of the quenching process. Too much time between the quenching and the tempering of the heat-treated parts. It is versatile in nature thus it enhances the performance of the quenching process.