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High-speed steel
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<p>High-speed steel (HSS or HS) is a subset of <a href="/facts/Tool_steel/CwCoRyqj">tool steels</a>, commonly used as <a href="/facts/Cutting_tool_material/36F4Hq0D">cutting tool material</a>. </p><p>Compared to high-<a href="/facts/Plain-carbon_steel/QGYURvFA">carbon steel</a> tools, high-speed steels can withstand higher temperatures without losing their temper (hardness), allowing use of faster <a href="/facts/Speeds_and_feeds/QNDp4bEq">cutting speeds</a>. At room temperature, in their generally recommended heat treatment, HSS grades generally display high hardness (above 60 <a href="/facts/Rockwell_hardness/vU2b7TNT">Rockwell C</a>) and abrasion resistance compared with common <a href="/facts/Carbon_steel/QGYURvFA">carbon</a> and <a href="/facts/Tool_steel/CwCoRyqj">tool steels</a>. There are several different types of high speed steel, such as M42 and M2. </p>