The term hardened steel is often used for a medium or high carbon steel that has been given the heat treatments of quenching followed by tempering. The quenching results in the formation of metastable martensite, the fraction of which is reduced to the desired amount during tempering. This is the most common state for finished articles such as tools and machine parts. In contrast, the same steel composition in annealed state will be softer as required for forming and machining.
Case hardened articles starting as low carbon steel can also be labeled hardened steel.
Famous quotes containing the words hardened and/or steel:
“The years of imprisonment hardened me.... Perhaps if you have been given a moment to hold back and wait for the next blow, your emotions wouldn’t be blunted as they have been in my case. When it happens every day of your life, when that pain becomes a way of life, I no longer have the emotion of fear. ... there is no longer anything I can fear. There is nothing the government has not done to me. There isn’t any pain I haven’t known.”
—Winnie Mandela (b. 1936)
“Man you ought to see his plans for allsteel buildins. He’s got an idea the skyscraper of the future’ll be built of steel and glass. We’ve been experimenting with vitrous tile recently... crist-amighty some of his plans would knock you out... He’s got a great sayin about some Roman emperor who found Rome of brick and left it of marble. Well he says he’s found New York of brick an that he’s goin to leave it of steel... steel an glass.”
—John Dos Passos (1896–1970)