The Main Disadvantages of Stainless Steel Powder Metallurgy

(The Main Disadvantages of Stainless Steel Powder Metallurgy)

Compared with stainless steel produced by traditional smelting process,
stainless steel powder metallurgy has the advantages of producing parts close to
net shape, high dimensional accuracy, high material utilization, and uniform
structure. However, it does not mean that stainless steel powder metallurgy
products are perfect. Stainless steel powder metallurgy also has its
disadvantages.

Most of the injection molding defects of stainless steel powder metallurgy
products are in the injection molding process. Some defects of injection molding
are visible to the naked eye, some may appear in the subsequent desorption or
sintering process, but they can also be traced back to the injection molding
process. Therefore, the quality control of stainless steel powder metallurgy
products is very important.

The defects of stainless steel powder metallurgy products are generally
manifested in injection molding plate defects: flashing, foaming, corrugated
surface, laminar or skin, depression and surface black spot deformation are
observed in appearance, low green strength, mold pasting operation. The causes
and influencing factors of these defects are different, among which injection
temperature and injection pressure are the key factors.

By adjusting the injection temperature and injection pressure, most defects
can be solved. When the temperature and pressure are adjusted to some defects,
it is the correct choice to further trace the binder system, the uniformity of
powder and jointing agent mixing and refining, whether the feed is polluted,
moisture absorption, humidity and other factors, and the mold cavity should be
checked. Body design, gate, shunt channel and gate design are reasonable.

In the normal operation of injection molding and high-quality injection
molding briquette, many influencing factors have been continuously explored and
summarized in practice, accumulated experience, compared the problem with
accurate analysis and judgment, and adjusted in time.

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(The Main Disadvantages of Stainless Steel Powder Metallurgy)