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Steel is a common durable alloy, and while most steel used in tools is already tough, you can harden it even more to prevent wear and tear. Hardened steel prevents knife blades from dulling and tools from bending and breaking. With a simple heating and quenching process, you can make your steel last for much longer!

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To harden steel, start by heating the metal directly with a blow torch until it turns a cherry red color. Then, use a pair of tongs to carry the steel to a container filled with water or vegetable, and submerge the hot metal in the liquid. When the liquid stops bubbling, remove the metal from the container and wipe off any excess liquid. To temper the steel so it isn't brittle, place it in an oven heated to 375 °F for 3 hours, and then it let it cool overnight. For more information on using a blowtorch and protecting the steel, scroll down! Did this summary help you?YesNo

This article was co-authored by Himesh Patel and by wikiHow staff writer, Hunter Rising. Himesh Patel is a Metallurgical Engineer at Mcclelland Laboratories in Reno, Nevada. With over five years of industry and graduate research experience in the raw materials industry, Himesh has extensive knowledge of mining and mineral extraction and recovery methods, mine financing, and the environmental impacts of mining. He received his MS in Metallurgical Engineering from the University of Nevada, Reno, and a Dual Degree in Mineral Engineering from the Indian Institute of Technology (Indian School of Mines), Dhanbad. Himesh is passionate about educating the public about the minerals industry. There are 10 references cited in this article, which can be found at the bottom of the page. wikiHow marks an article as reader-approved once it receives enough positive feedback. This article received 28 testimonials and 90% of readers who voted found it helpful, earning it our reader-approved status. This article has been viewed 1,025,105 times.

With a large flute clearance, O-flute end mills are designed for fast chip evacuation. A single flute minimizes tool contact with the material. This results in a cooler process to keep temperature sensitive materials from sticking and rewelding to the tool.

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If you need to use a blow torch, focus the flame tip on the area you want hardened. Keep heating the steel until you notice a blue color form on the metal. This signifies that the steel is tempered.