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Silver Steel BS1407
Silver Steel is a versatile high carbon tool steel ground to very close tolerances.
It is so called because of its highly polished appearance created by the extremely
fine surface finish. The high carbon content of this BS1407 silver steel means that
it can be hardened to give considerable wear resistance and the chromium content
increases strength and hardenability. It is readily machinable as supplied in the
spheroidised annealed condition. The material as delivered shall have a hardness
of not more than 285HB when measured in accordance with BS240
Heat slowly to 760 - 800°C using the upper end of the temperature range for lower
carbon contents and lower end of temperature range for higher carbon contents. Austenitize
until the temperature is uniform. Quench into well agitated water.
Temper immediately after hardening preferably before the tool reaches room temperature.
Temper for a minimum of 1 hour at temperatures between 180 - 350°C, dependent upon
the final hardness required.