The formation of iron-rich particles in extruded brass rods has been observed on reheating for hot stamping and the rate of precipitation was determined in samples of BS2874:CZ121 type brass rods reheated to temperatures within the range 630°–825°C. The rate-controlling factors were found to be casting method, extrusion preheat time, silicon content, and reheat temperature; the lowest and highest precipitation rates upon reheating were observed respectively in a low-(<0·0001%) silicon rod extruded after a short preheat from a semi-continuous cast billet and a rod containing 0·0006%Si extruded after a long preheat from a static chill-cast billet (poured in a cast iron mould).
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