Hardenability is the ability of the steel to produce the appropriate hardness in relation to the amount of martensite when quenched for its austenitizing temperature into the appropriate quench medium. The resulting hardness will be according to its cross-sectional area and chemistry (composition).
The hardenability test is measured by heating a test piece of a very specific size, followed by heating the test bar and quenching the end face. This test is known as the Jominy End Quench Hardenability End test.                     

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