FIELD: metallurgy.
SUBSTANCE: shell is made by rotary extrusion and subjected to heat treatment and machining, i.e. cutting of cooling channels. Said rotary extrusion comprises hardening to reduction of 38.0-45.0% while for better cutting properties annealing is performed in primary recrystallisation process at 780°C-800°C for 30 minutes.
EFFECT: better mechanical properties and workability.
3 dwg, 3 tbl
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