Causes of hot and cold defects in stainless steel impeller guide vanes

cause:

1. The chemical composition of the alloy is improper. The temperature of the molten metal is too low when it is out of the furnace or when it is poured, the molten metal is seriously oxidized and the fluidity is poor.

2. The pouring of the stainless steel impeller guide vane is interrupted due to the insufficient amount of molten metal, or due to reasons such as fire running.

3. The method of pouring is relatively unreasonable, the position of the inner pouring is improper, the cross-sectional area is too small, and the quantity is small. The height of direct pouring is low, and the liquid metal head is not enough.

4. After the molten metal is formed, it does not fuse well at its junction, and the penetrating and non-penetrating gaps produced in the stainless steel impeller guide vanes are called cold partitions. The molten metal enters the metal first in the filling process.

5. The molten metal contacts the moulded wall to solidify prematurely, and after entering the molten metal, it cannot be fused with the solidified metal layer. Moirés are formed at the butt of the surface of the stainless steel impeller guide vane, which appears on the surface of the casting away from the flow channel and has many strip defects. , The edges are rounded.