Monoblock cast all-purpose horizontal high-chromium cast iron collar and preparation method
A technology of integral casting and high chromium cast iron, applied in the field of iron and steel forging, can solve the problems of not being able to produce good products, achieve the effects of improving accident resistance, increasing hardness and wear resistance, and optimizing casting performance
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[0016] (1) Smelting: molten iron is smelted in an intermediate frequency electric furnace, the melting temperature of the molten iron is 1450~1620°C, and pure molten iron is obtained through a pass through;
[0017] (2) Add a modifier to the molten iron ladle, the amount added is 0.10-0.50% AL of the molten iron quality, 0.20-0.50% silicon-calcium, and the modification is carried out when the iron is tapped;
[0018] (3) Pouring: Pour molten iron into the mold cavity. In order to prevent insufficient static pouring flushing force, the bottom injection tangential pouring method is adopted, and the molten iron is quickly rotated from the bottom to fill it from bottom to top, so that the casting metallurgical inclusions able to rise rapidly;
[0019] (4) Heat treatment: The roller ring blank is subjected to stress relief annealing, the annealing temperature is 750-900 degrees, the heat treatment and annealing holding time is 200-350 hours, after the heat preservation is completed...
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