HSS steel drill bits, hardened, tempered to increase cutting performance
Tempering colours When steel is heated in air, oxides are formed on the surface of the steel; the colour of these oxides depends upon the temperature of the metal. Colours range from a very pale yellow (straw) through brown and purple to blue; they form bands which travel along the metal away from the area which is being heated. They are most easily seen if the metal is lightly polished with emery cloth before heating and are most noticeable in daylight; distinguishing the colours in artificial light can be difficult. Before treating a tool, practise with a piece of scrap steel in order to become familiar with the colour range.
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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: bits, cutting, drill, engineering, hardened, hss, increase, machining, metals, metrology, performance, steel, swarf, tempered
