1. Precise Temperature and Flow Control to Eliminate Insufficient Pouring and Cold Shuts
To address defects like incomplete filling and poor fusion, the company has upgraded its melting and pouring temperature control system, using high-precision thermometers to monitor molten metal temperature in real time. The pouring temperature of stainless steel and alloy steel is stably controlled within the precise range of 1580–1620°C. The gating system design is optimized with a combination of bottom gating and step gating, following a standardized "slow-fast-slow" pouring rhythm to avoid interruptions. The cross-sectional areas of runners and ingates are increased to improve mold-filling capacity, completely resolving insufficient filling in thin-walled and complex structural parts.
2. Enhanced Degassing and Dehumidification to Remove Blowholes and Pinholes
For internal cavity defects such as blowholes and pinholes, the technical team implements dual control over molten metal and molds. In the melting stage, inert gas protection and vacuum degassing are adopted, with high-efficiency deoxidizers added to minimize residual gases such as hydrogen and oxygen. In the shell-making process, roasting temperature and duration are strictly controlled to ensure full drying of shells, eliminating moisture and residual wax to avoid excessive steam during pouring. Shell permeability is improved through optimized particle gradation, and pouring speed is regulated to prevent turbulence and air entrainment, achieving dense, pore-free internal structures.