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How to improve the fluidity of cast steel?
Improving the fluidity of cast steel requires a multi-faceted approach, including optimizing chemical composition, improving smelting processes, adjusting casting processes, and optimizing mold design.
Release time: 2025-05-14
Casting Process Adjustments
1. Optimize gating system design
Adopt bottom-pouring gating system:
Molten steel is steadily poured from the bottom of the mold, avoiding splashing and vortexes (vortexes easily entrain air and scale), reducing filling resistance. For example, large steel castings (such as rolls) often use bottom-pouring + top-pouring gates.
Increase gate cross-sectional area:
Improve filling speed and shorten the cooling time of molten steel in the cavity. For example, increasing the inner runner cross-sectional area from 20cm² to 30cm² can shorten the filling time by 20%~30%.
Avoid right-angle turns:
The gating system is designed with circular arc transitions (radius of curvature ≥50mm) to reduce flow resistance.
2. Use insulated risers and chills
Insulated risers:
Insulating agents (such as exothermic sleeves) are added to the riser to slow down riser solidification, prolong the feeding time, and indirectly maintain the fluidity of the molten steel.
Chills control solidification sequence:
Chills (such as cast iron blocks or copper blocks) are placed in the thick-walled areas of the casting to accelerate local cooling, allowing the casting to solidify in the order of “thin wall → thick wall → riser”, avoiding premature loss of fluidity in the thick-walled areas.
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