Stainless steel commonly use smelting process. Because of its difficult
cutting, products have problem with bad
accuracy, surface roughness. Thus there are still many technical problems for stainless steel manufacturing. Compared
with the traditional smelting process to produce stainless steel, stainless
steel by MIM manufacturing process has near net shape, high accuracy and
material utilization, uniform organizational structure, etc.. It have been
widely used in machinery, chemicals, shipbuilding, automotive, instrumentation
and other industries.
However, the internal porosity of MIM stainless steel greatly decreased
mechanical properties, and corrosion resistance, thus severely limiting its
application. Studies have shown that, by MIM manufacturing process, almost all
of the properties of stainless steel are improved as the density increases.
Therefore, how to increase the density of powder metallurgy stainless steel and
reducing its porosity is the key issues of powder metallurgy stainless steel.
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