Comparison of nodular cast iron and cast iron.
Compared with cast iron, nodular cast iron has the absolute
advantage in terms of strength. The tensile strength of ductile
cast iron is 60 k, and the tensile strength of cast iron only 31
k. The yield strength of ductile cast iron is 40 k, and cast
iron did not show out the yield strength, and eventually break.
The strength of the nodular cast iron - cost ratio is much
better than cast iron. Nodular cast iron and cast the same in
terms of corrosion resistance.
Comparison of nodular cast iron and cast steel.
The strength of the strength of the nodular cast iron and cast
steel is comparable. Nodular cast iron has higher yield strength
and the minimum yield strength of 40 k, the yield strength of
cast steel only 36 in most municipal application fields, such
as: water, salt water, steam, etc., corrosion resistance and
oxidation resistance of ductile iron is more than cast steel.
Because of spheroidal graphite cast iron spheroidal graphite
microstructure, in less vibration, ductile cast iron is better
than that of cast steel, thus more conducive to reducing stress.
Choose one important reason of nodular cast iron is nodular cast
iron is lower than cast steel cost.
Nodular cast iron of low cost makes the material more popular,
the casting is more efficient, less ductile cast iron machining
cost. Because of the characteristics of nodular cast iron,
making it to the valve materials [the use of lead, in many of
the cast steel can't use the occasion of corrosive medium such
as water, it can use, and cost is much lower than corrosion
resistance of stainless steel.
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