Manufacturing process of high-strength spheroidal graphite cast iron sleeve pieces
A nodular cast iron, manufacturing process technology, applied in the field of casting, can solve problems such as functional failure and inability to guarantee strength
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[0022] 1. Production preparation: Select Q10 pig iron, ferrosilicon, ferromanganese, nodulizer, inoculant, and pure metal for adding elements. Centrifugal casting is adopted, and intermediate frequency furnace is used for melting equipment;
[0023] 2. Melting method: smelting in intermediate frequency furnace, slag making, slag removal, carburization, deoxidation, desulfurization, dephosphorization, gas removal, sundries removal, that is, adjusting composition and temperature;
[0024] Composition control: refers to the control of key elements of ductile iron castings during chemical composition testing
[0025] C=3.2~3.8﹪, Si=1.5~2.5﹪, Mn=0.5~1.0﹪, Ni=0.5~1.5﹪, Cu=0.02~0.05﹪, Mg=0.035~0.06﹪, control of harmful elements S≤0.02﹪ , P≤0.06﹪, other components refer to the requirements of relevant standards;
[0026] 3. Purify molten iron: add covering agent on the furnace, slag removal and slag removal for many times;
[0027] 4. Control the temperature: keep the molten iron i...
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