Dictionary – Refining

Although for many case depths, and with current grain-growth-inhibited steels, refining is often considered as not being necessary.

However, because grain growth occurs at the elevated temperatures necessary for carburising, and where the carburising cycles are long (to produce particularly deep cases), or the component would benefit from a finer grain size, then core (grain) refining, can be specified.

Refining increases the deformation strength of the steel at the micro level – (yield strength at the macro level)

Holts offer the same range of furnace types and sizes for refining, as those used for carburising