When completing stainless steel casting process, we may found that the surface of some stainless steel castings are smooth, but some look a bit rough. So what caused the difference? Here we would like to analysize the reasons that may affect the surface roughness of stainless steel castings.
1. Surface Quality of Stainless Steel
The stainless steel is made of columnar crystal structure mesh, and the refractory materials, additives and water are filled in the middle, so that there are different sizes of pores on the surface after drying roasting. The surface porosity of stainless steel is the main cause of rough surface. Infiltration depth of molten metal: it is related to the diameter of crystal, the average diameter of surface pore and the radius of curvature of alloy liquid.
2. Quality of Mold and Wax Patterns
The surface roughness of wax patterns is the key factor that affects the surface roughness of stainless steel castings. Besides, the mold will also affect the surface quality of stainless steel castings.
3. Pouring Process
The temperature of stainless steel, the casting temperature of molten metal, the vacuum degree and other technological parameters of the stainless steel casting process have an influence on the surface roughness of the castings, especially the temperature of pouring temperature
With the increase of pouring temperature and molten stainless steel, the metal liquid filling performance can be improved, and the surface roughness of the stainless steel castings will be increased.
4. The effect of Alloy
Thermal conductivity is small, after the use of stainless steel, metal poured into the type of cooling slowly, coarse grains of castings, the intergranular concave can make the casting surface is rough, the grain boundary concave depth may even reach 7 microns. For this, for alloy modification treatment, and use the zircon with better thermal conductivity etc. Packing in order to improve the cooling speed of stainless steel castings, castings surface grain is relatively small, to reduce the casting surface roughness.
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