FIELD: metallurgy.
SUBSTANCE: casting is subject to thermo-cycling and successive heating in melted urea in interval of 135-150°C, then to holding during 10-20 min and cooling in air; also casting is heated to 980-1020°C in each cycle, held at this temperature for 5-15 min and cooled in water; amount of cycles comes to 3.
EFFECT: reduced linear expansion factor of casting.
1 ex, 1 tbl, 1 dwg
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